Academic literature on the topic 'Slip-Critical Connection'
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Journal articles on the topic "Slip-Critical Connection"
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Zhu, Mei Chun, Yan Jun Jiang, Guo Biao Lou, and Guo Qiang Li. "Test on Slip Coefficient of High-Strength Bolted Slip-Critical Connections after Fire." Applied Mechanics and Materials 351-352 (August 2013): 1368–71. http://dx.doi.org/10.4028/www.scientific.net/amm.351-352.1368.
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Fire safety is a major concern with steel structures. Actually, steel structures were not fatally destroyed in most cases of fire. These damaged steel structures may be reused after structural inspection, safety appraisal and necessary repair. Bolted connections are the most widely used connection in steel structures. Slip coefficient is a key parameter to calculate the slip bearing capacity of bolted slip-critical connections. Currently there are few research results available about slip coefficient of bolted slip-critical connections after fire. To obtain the effect of heating and cooling on slip coefficient, a series of slip load tests on connections that had been heated and cooled to ambient temperature were carried out in this study. Methods of friction surface treatment included shot blast and painting inorganic zincs after shot blast. Test results show that heating and cooling have a great effect on slip coefficient of connections with two methods of friction surface treatment, among which effect on connections with shot blasting surfaces is more significant.
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Lee, Kang Min, Keun Yeong Oh, Liu Yi Chen, and Rui Li. "Effects of Different Bolted Connection Types on Seismic Performance of Column-Tree Steel Moment Connections." Advanced Materials Research 753-755 (August 2013): 581–84. http://dx.doi.org/10.4028/www.scientific.net/amr.753-755.581.
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This paper experimentally presents the effects of different bolted connection types on the seismic performance of column-tree steel moment connections used in moment resisting frames. Two full scale test specimens were fabricated and tested: one specimen with slip critical bolted beam splices and the other one with bearing type bolted beam splices. The bearing type splice specimen was expected an improved deformation capacity by means of bolt slippage. The experimental results showed that the slip critical splice specimen successfully developed ductile behavior without brittle fracture until 5% story drift ratio, however for the bearing type splice specimen, the beam bottom flange fractured at 4.0% story drift ratio due to stress concentration around the weld access hole area. However the energy dissipation capacity of the bearing type splice specimen was better than that of the slip critical splice specimen until 4.0% story drift ratio.
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Lee, Dong-Seok, Shoichi Kishiki, Satoshi Yamada, Takanori Ishida, and Yu Jiao. "Experimental Study of Low-Cycle Fatigue Behavior of a Welded Flange-Bolted Web Connection in Steel Moment-Resisting Frames." Earthquake Spectra 34, no. 4 (2018): 1829–46. http://dx.doi.org/10.1193/062617eqs131m.
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This paper describes an experimental investigation of the low-cycle fatigue (LCF) behavior of welded flange-bolted web (WFBW) connections, which are commonly employed in high-rise steel moment-resisting frames (MRFs) in Japan. The main parameters investigated in this study were (1) bolt configuration of the web connection and (2) steel grade. According to test results, LCF capacity depends on the slip behavior of different bolt configurations, even at relatively minor inelastic rotations. Slip behavior effects can be evaluated by the yield strength of the shear plate or the slip-critical strength; for specimens whose shear plate yield strength was designed to be higher than the slip-critical strength, LCF capacity showed that the upper limit can neglect slip behavior. Furthermore, it was shown that LCF behavior can be evaluated by the same fatigue curve in the relationship of fatigue capacity and beam rotation amplitude, regardless of steel yield stress.
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Yoon, Tae-Hyun, Tae-Sung Eom, Chul-Goo Kim, and Su-Min Kang. "Behavior of Longitudinal Plate-to-Rectangular Hollow Structural Section K-Connections Subjected to Cyclic Loading." Applied Sciences 10, no. 11 (2020): 3793. http://dx.doi.org/10.3390/app10113793.
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This study investigated the behavior of longitudinal plate-to-rectangular hollow section (RHS) K-connections to which concrete-filled composite branch members were jointed. At the connections, longitudinal plates with or without chord face stiffener were welded to the RHS chord member and the branch members were connected to the longitudinal plates by bolting (slip-critical connection). Cyclic tests were performed for three longitudinal plate-to-RHS K-connection specimens. The tests showed that the connection behavior was dominated by the plastification of the thin chord face and by the slip and hole-bearing resistance of the bolted joint. Chord face plastification was prevented or delayed by using the stiffened longitudinal plate. The strengths of the plate-to-RHS K-connections with or without the chord face stiffener, depending on the governing limit states, were estimated in accordance with current design codes, and the results were compared with the test results.
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Peng, Yang, Wei Chen, Zhe Wu, Jun Zhao, and Jun Dong. "Experimental Study on the Performance of GFRP–GFRP Slip-Critical Connections with and without Stainless-Steel Cover Plates." Applied Sciences 10, no. 12 (2020): 4393. http://dx.doi.org/10.3390/app10124393.
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Composite structures have become increasingly popular in civil engineering due to many advantages, such as light weight, excellent corrosion resistance and high productivity. However, they still lack the strength, stiffness, and convenience of constructions of fastener connections in steel structures. The most popular fastener connections in steel structures are slip-critical connections, and the major factors that influence their strength are the slip factors between faying surfaces and the clamping force due to the prevailing torque. This paper therefore examined the effect that changing the following parameters had on the slip factor: (1) replacing glass fiber reinforced plastic (GFRP) cover plates with stainless-steel cover plates; (2) adopting different surface treatments for GFRP-connecting plates and stainless-steel cover plates, respectively; and (3) applying different prevailing torques to the high-strength bolts. The impact on the long-term effects of the creep property in composite elements under the pressure of high-strength bolts was also studied with pre-tension force relaxation tests. It is shown that a high-efficiency fastener connection can be obtained by using stainless-steel cover plates with a grit-blasting surface treatment, with the maximum slip factor reaching 0.45, while the effects of the creep property are negligible.
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Li, Fa Xiong, Qian Liu, and Hou Qing Huang. "Buckling Behaviors of Steel-Concrete Composite Plate." Applied Mechanics and Materials 405-408 (September 2013): 2544–49. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.2544.
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The flexibility of connection between the steel plate and concrete slab gives rise to interface slip and additional deflection. A method of analysis for steel-concrete composite plate with slip effect resulting from studs is presented. The basic idea is to place a hypothetical thin shear-layer between steel and concrete slab, where all the shear deformation is concentrated in the thin layer. Analytical solutions for elastic critical buckling load of composite plate considering slip effect under axial compressive and pure shear are derived. The theory model and the solutions are then validated by means of three-dimensional finite element analysis.
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Li, Fa Xiong, Jian Guo Nie, Jing Quan Zhang, and Wan Heng Li. "Elatic Bending and Buckling of Steel-Concrete Composite Plate Considering Slip Effect." Applied Mechanics and Materials 90-93 (September 2011): 988–93. http://dx.doi.org/10.4028/www.scientific.net/amm.90-93.988.
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Steel-concrete composite plates are formed using steel plates connected to a concrete slabs by means of welded stud shear connectors. The flexibility of connection between the steel plates and concrete gives rise to interface slip and additional deflection. An analytical model considering slip effect for composite plate is presented in this paper. Analytical solutions for deformation of composite plate under lateral load and elastic critical buckling load of composite plate under axial compressive load are deserved. The model and the solutions are then validated by means of finite element analysis. According to the parametric study, when impact factor greater than 5, the critical buckling load of simply composite plate is close to the superposition of the critical buckling loads of steel and concrete slabs and the interaction of both slabs can be ignored.
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Guo, Hong, Jiaxin Zhang, and Changwei Wang. "Experimental Study on Influence of Connection Defects on Joint Strength of Half-Grouted Sleeve Splicing of Rebar." Advances in Civil Engineering 2020 (June 13, 2020): 1–15. http://dx.doi.org/10.1155/2020/5389861.
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The different types of defects of half grouting sleeves will remarkably increase the risks of precast concrete structures. In order to better understand the defects of rebar connections between half grouting sleeves, six different test groups on insufficient grout height, insufficient compactness, rebar offset, insufficient rebar anchor length, overtime grouting, and control group had been researched. The uniaxial tension experiments were conducted for the 24 different specimens, and load-slip curves were also analyzed. The results of the experiments showed that the outside of the rebar was snapped off as for the destruction mode, while the destruction mode changed as the increment of the degree of defect surpasses the critical value. The bearing capacity and deformability were dropped with the increase in the degree of defects, and a critical value of rebar anchoring length of sleeve was discovered. In the end, different finite-element models were built based on different deficient situations, and load-slip constitutive model was obtained, which would be helpful to evaluate the structural performance of precast concrete structures in construction.
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Liu, Zhi Yun, Jian Bing Chen, Long Jin, and Jian Xu. "Development of Slope Stability Evaluation Process of Frozen Soil in Coupling Temperature Field." Advanced Materials Research 446-449 (January 2012): 1948–56. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.1948.
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The slope stability analysis in cold region is special for its non-uniform temperature field. Considering the special characteristic of the slope in cold region, the physical parameters of frozen soil are treated in this paper as the connection between temperature field and stress field. The temperature influences mechanical properties of frozen soil and forms freezing-thawing interface in the slope, which make great influence on the stability of slope. The critical slip surface searching algorithm for cold region is developed and the moment center solution method in the computation of slope’s stability coefficient is also improved. The critical slip surface and stability of 4m subgrade with 1: 1.5 slopes under different soil temperature condition is computed using the developed frozen subgrade stability computation program. The results shows that the line segment type slip surface is more accuracy than circle type slip surface in cold region slope stability analysis; moreover, the minimum stability coefficient of frozen subgrade does not happen in tenth months when the thawing soil goes to deepest, but show in the early time of warm season, forming the phenomenon of thaw slumping. And it is also found that the occurring time of yearly minimum landslide stability coefficient postpones as the decreasing of soil temperature.
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Nelson, Mark, Yu Ching Lai, and Amir Fam. "Moment Connection of Concrete-Filled Fiber Reinforced Polymer Tubes by Direct Embedment into Footings." Advances in Structural Engineering 11, no. 5 (2008): 537–47. http://dx.doi.org/10.1260/136943308786412023.
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A moment connection of concrete-filled fibre reinforced polymer (FRP) tubes (CFFTs) to concrete footing is explored. The CFFTs are directly embedded into the footings to develop their full moment capacity, in lieu of using mechanical connections, dowel reinforcing bars, or posttensioning methods. CFFT specimens of 219 mm diameter (D) were embedded into footings, at various depths, ranging from 0.3D to 1.5D. The CFFT cantilevered specimens were then laterally loaded to failure. The objective was to establish the critical embedment length, which was found to be 0.73D. Shorter embedment lengths resulted in a bond failure associated with excessive slip, where the full flexural strength of CFFTs was not reached. Specimens with the critical or longer embedment lengths have achieved flexural tension failure of the CFFT, just outside the footing. Ancillary push-through tests were also carried out using CFFT stubs embedded into concrete footings, throughout the full thickness of the footing, and tested under concentric compression loads. The objective was to establish the bond strength between the GFRP tube and concrete footing, which was found to be 0.75 MPa. The bond strength and critical embedment length will vary from case to case. As such, the parameters affecting their values have been identified.
Dissertations / Theses on the topic "Slip-Critical Connection"
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Potgieter, Johannes Hendrik Jacob. "Optimal topology and critical evaluation of slip synchronous permanent magnet wind generator." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/86430.
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Thesis (PhD)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: In this study the recently proposed slip-synchronous permanent magnet generator (SS-PMG), is
considered as an alternative to other wind generator topologies. The SS-PMG is connected directly
to the grid without the need for a power electronic converter and it can also be connected directly
to the turbine without a gearbox. Due to the SS-PMG requiring no gearbox or power electronic
converter it is evident that this type of generator have a significant advantage regarding reduced
maintenance and operation costs. The SS-PMG consist of two integrated permanent magnet generating
units, a directly turbine connected slip permanent magnet generator (slip-PMG) and a directly
grid connected permanent magnet synchronous generator (PMSG). In this, study many of the implementation
aspects of the SS-PMG are addressed. It is found that the short-circuit torque and
current profiles of both the slip-PMG and PMSG are significantly influenced by the end-winding
inductance and PM end-effects. A new analytical method is proposed for the calculation of the
end-winding inductance in this study and a new approach is devised to take the PM end-effects
into account. A very important aspect considered in this thesis, is the stability of the SS-PMG
connected directly to the grid regarding turbine, generator and grid voltage disturbances, which
influences the design of the PMSG and slip-PMG units. Furthermore, it is important that the final
SS-PMG design comply to the relevant grid code specifications. For both the PMSG and slip-PMG
an extensive design optimisation is done, with several novel wind generator concepts introduced.
In this study the dynamic behaviour, grid connection aspects and operational principles of the SSPMG
are verified by means of practical tests in the laboratory and for the SS-PMG interfaced with
an existing 15 kW wind turbine system in the field.<br>AFRIKAANSE OPSOMMING: In hierdie studie word die onlangs voorgestelde, glip-sinchroon permanent magneet generator (GSPMG),
oorweeg as ’n alternatief vir ander wind generator topologieë. Die GS-PMG word direk
aan die netwerk gekonnekteer sonder die nodigheid van ’n drywingselektroniese omsetter en dit kan
ook direk aan die turbine gekoppel word sonder ’n ratkas. Omdat die GS-PMG geen ratkas of
drywingselektroniese omsetter benodig nie, is dit duidelik dat hierdie tipe generator ’n geweldige
voordeel het rakende verminderde onderhoud en operasionele kostes. Die GS-PMG bestaan uit twee
geïntegreerde permanent magneet generator eenhede, ’n direkte turbine gekoppelde glip permanent
magneet generator (glip-PMG) en ’n direkte netwerk gekonnekteerde permanent magneet sinchroon
generator (PMSG). In hierdie studie word baie van die implementerings aspekte van die SS-PMG
aangeraak. Daar word gevind dat die kortsluit draaimoment en stroom profiele van beide die glip-
PMG en PMSG geweldig deur die end-wikkeling induktansie en PM randeffekte beïnvloed word.
Dus, word ’n nuwe analitiese metode voorgestel vir die uitwerk van die end-wikkeling induktansie
in hierdie studie en ’n nuwe benadering word voorgestel om die PM randeffekte in ag te neem. ’n
Baie belangrike aspek om te oorweeg in hierdie tesis, is die stabiliteit van die GS-PMG direk aan die
netwerk gekoppel rakende turbine, generator en netwerkspanning steurnisse, wat die ontwerp van
die PMSG en glip-PMG eenhede beïnvloed. Dit is ook belangrik dat die finale SS-PMG ontwerp
voldoen aan die relevante netwerkkode spesifikasies. Vir beide die PMSG en glip-PMG word ’n
deeglike ontwerpsoptimering gedoen, met talle nuwe wind generator konsepte voorgestel. In hierdie
studie word die dinamiese gedrag, netwerk konneksie aspekte en operasionele kenmerke van die GSPMG
geverifieer met behulp van praktiese toetse in die laboratorium en vir die SS-PMG geïntegreer
met ’n bestaande 15 kW wind turbine stelsel in die veld.
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Boggs, Joshua Thomas. "The Performance and Behavior of Deck-to-Girder Connections for the Sandwich Plate System (SPS) in Bridge Deck Applications." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/32998.
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An innovative approach to possible construction or rehabilitation of bridge decks can be found in a bridge construction system called the Sandwich Plate System (SPS). The technology developed and patented by Intelligent Engineering Canada Limited in conjunction with an industry partner, Elastogran GmbH, a member of BASF, may be an effective alternative to traditional bridge rehabilitation techniques.
<p>
Although the systemâ s behavior has been studied the connection of the SPS deck to the supporting girders has not been investigated. Two types of connection are presented in this research. The use of a bent plate welded to the SPS deck and subsequently bolted to the supporting girder utilizing slip-critical connections has been utilized in the construction of a SPS bridge. A proposed SPS bridge system utilizes the top flange of the supporting girder welded directly to the SPS deck as the deck-to-girder connection.<p>
The fatigue performance of a deck-to-girder connection utilizing a bent plate welded to the deck and bolted to the supporting girder using slip-critical connections was tested in the Virginia Tech Materials and Structures Laboratory. The testing concluded that the fatigue performance of the welded and bolted bent plate connection was limited by the weld details and no slip occurred in the slip-critical connections. Finite element modeling of the two types of deck-to-girder connections was also used to determine influence of the connections on the local and global behavior of a SPS bridge system. A comparison of the different connection details showed that the connection utilizing the flange welded directly to the SPS deck significantly reduces the stresses at location of the welds in the connections, but the connection type has a limited influence on the global behavior of a SPS bridge.<br>Master of Science
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Corro, Claudia L. "An evaluation of the behaviour of slip-critical connections subjected to combined shear and tension." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0014/MQ52534.pdf.
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Shang, Haodi. "Experimental Investigation and Simulation of High Performance Surface Coating in Steel Bolted Slip-Critical Connections." Thesis, University of Louisiana at Lafayette, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10287241.
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<p>Slip-critical connections have been used in steel structures for a long time where bolted joints are subjected to cyclic load and fatigue with slotted or oversized holes. The understanding of these connections has resulted in the limitation of maximum slip coefficients (0.50 for Class B surfaces) with surface preparation. High performance surface coating (HPSC) is one possible new method to significantly enhance the strength of slip-critical connections. In this research, two kinds of mineral particles, synthetic diamond and tungsten carbide are applied on HPSC for simple shear slip tests with variation in parameters of particle size, particle density, slip rate and clamping force. Finite element simulations are conducted for sensitivity analysis of the research. The test results showed that HPSCs can give drastically enhancement in slip coefficient and provide more stable, predictable behavior than bare metal surfaces, one group of HPSCs can give slip coefficient as high as 0.52?0.01, particle grain size and particle density will affect the slip coefficient of HPSCs, slip rate and clamping force will not affect the slip coefficient of HPSCs. Simulation results showed that considering HPSCs as homogeneous and isotropic material can well predict the slip coefficient and slip load of the connection, but not suitable for the behavior after failure. Recommendations are made for continue research on HPSCs.
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Hsieh, Tsung-Cheng, and 謝宗成. "Evaluation of Slip Coefficient of Bolted Slip-Critical Connections with Thermal Sprayed Coating." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/cbnu3r.
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碩士<br>國立交通大學<br>土木工程系所<br>105<br>The objective of this study is to increase the slip coefficient of bolted slip-critical connections by applying a thermal sprayed coating on faying surfaces, and further to reduce the number of bolts and connection’s dimension while satisfying the design force. The specimens were designed according to related specifications. The effects of the coating material, coating thickness, steel material, bolt type, and surface roughness of the steel plate on the slip coefficient were evaluated. The test results showed that the slip coefficients of the connection by thermal spraying aluminum-magnesium alloy coating on the faying surface were increased to the range of 0.81 to 1.04. The average slip coefficient is 0.91 which is 1.3 times the slip coefficient 0.71 of connections with uncoated faying surface. The slip coefficient of the aluminum-magnesium alloy coated faying surface proved to be more stable compared to that of the pure aluminum coated faying surface. However, the slip coefficients were reduced by 11.1 and 12.9% for aluminum-magnesium alloy and pure aluminum coated faying surface, respectively, when coating thickness was increased from 150 to 450 μm. Using the steel material of SM570MB instead of S490B resulted in an unstable frictional behavior that was presumed to be affected by the discrepancies caused by the blasting and thermal sprayed coating on the steel material. However, the steel material had insignificant effect on the slip coefficient. The use of the super-high strength bolt F14T on the connection led to higher slip resistance than the use of high-strength bolt F10T, but had negligible effect on the slip coefficient. The surface roughness of the steel plate might affect the bond strength between the steel plate and coating, and increasing the surface roughness from 7.1 to 12.8 μm slightly improved the slip coefficient. To prevent the bolts from shear failure after slip occurs, the slip coefficient of the bolted slip-critical connection with aluminum-magnesium coating is suggested to be 0.7 which is 2 times higher than that of the uncoated connection, having a slip coefficient of 0.33. Using the slip coefficient of 0.7 results in a reduction of more than 50% of the bolt amount and the splice plate size, and achieves the saving of the materials, and construction cost and time.
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Chang, Cheng, and 張誠. "Slip Coefficient and Creep Behavior of Bolted Slip-Critical Connections with Thermal Sprayed Coating." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/zx97xc.
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碩士<br>國立交通大學<br>土木工程系所<br>107<br>This research explore the application of thermal sprayed coating to slip-critical joints to increase the slip coefficient and confirm the slip-critical joints with coating satisfying the creep requirements. The experiment consisted of two sequence tests of slip test and tension creep test. The slip test used to investigate the influence of the coating material and coating thickness on the slip coefficient. The tension creep test was conducted by applied the load calculated based on the slip coefficient, and recorded the slip due to the creep of the coating under a long-term load of 1000 hours. The specimens comprised two splice plates with thermal sprayed coating and a main blasted plate, jointed by a high-strength bolt F10T. The slip test results showed that using pure aluminum or aluminum-magnesium alloy sprayed coating, the slip coefficients could reach 0.82 to 0.94, with an average of 0.88 that was 1.6 times or more than the specified slip coefficient of 0.50 for Class B coating on blast-cleaned steel. The thickness of the coating had no significant effect on the slip coefficient, but as the thickness of the coating increased, the bolt pretension loss increased. The test results of the tension creep test showed that significant creep behavior was observed during the first 100 hours of the test, and the slip during this period was about 80% of the total slip. Specimens with thermal sprayed either pure aluminum or aluminum-magnesium alloy with 150 μm coating thickness, under the design load calculated by a slip coefficient of 0.60, can meet the requirements of the tension creep test. In this research, the application of the thermal sprayed aluminum alloy to the slip-critical joint can increase the slip coefficient and enhance the connection resistance that can be used in engineering practice.
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Li, Si-Wei, and 李思維. "Effect of Bolt Arrangement on Slip Behavior of Slip-Critical Connections with Thermal Sprayed Coating." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/b86p6u.
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碩士<br>國立交通大學<br>土木工程系所<br>107<br>In this study, thermal sprayed coating was applied to the faying surface of steel plates in order to increase the slip coefficient and enhance the slip resistance of the slip-critical joint. Moreover, this study aims to explore the effect of bolt arrangement on slip resistance. Slip tests of slip-critical connection using eight high-strength bolts were carried out to explore the effects of different bolt arrangement on the slip coefficient, bolt pretension, stress on the splice plate, and slip resistance. Splice plates of the specimens were thermal sprayed coated with 150
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Suei, Kai-Yuan, and 隋開元. "A study on high-strength bolts and slip-critical connections with welds." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/60558647545572034856.
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碩士<br>國立高雄大學<br>土木與環境工程學系碩士班<br>103<br>As suggested by AISC (2010), Taiwan steel design regulations do not recommend slip-critical high strength bolts to use with fillet welds. No similar restrictions are set by AIJ (2012). This paper evaluates the deformation capacity and strength of slip-critical high strength bolts in combination with fillet welds. AIJ suggests that bolts may have sliding deformations of 0.2 mm. The analyzed 45 joints were found to have deformations greater than the sliding deformation, and even greater than the fracture deformations of fillet welds. The joint strength were found to approximate to 90% of the sum of bolt sliding strength and weld fracture strength. The percentage is slightly smaller than that for transvers and longitude welds. The nominal values of bolt sliding strength and weld fracture strength were calculated using AISC formula, and were then summed up to calculation the joint strength as suggested by AIJ. The ratio of test to calculation was taken as the factor of safety (S.F.). The S.F. values of the 119 analyzed joints were found to have a maximum of 2.75, a minimum of 1.23, and an average of 1.92.
Book chapters on the topic "Slip-Critical Connection"
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Wang, W., M. X. Li, Y. Y. Chen, and X. G. Jian. "Behavior of extended endplate connections between RHS column and H beam using slip-critical blind bolts." In Tubular Structures XVI. CRC Press, 2017. http://dx.doi.org/10.1201/9781351210843-18.
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Bibik, Olena, and Oleksandr Popovich. "INCREASING THE EFFICIENCY OF ELECTRIC DRIVES WITH PERIODICAL LOADING BY USING COMPREHENSIVE MATHEMATICAL MODELING MEANS." In Priority areas for development of scientific research: domestic and foreign experience. Publishing House “Baltija Publishing”, 2021. http://dx.doi.org/10.30525/978-9934-26-049-0-31.
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The mode of operation of induction motors (IMs) affects their performance. In most cases, motors are optimally designed for steady state operation. When operating in other modes, additional attention is required to the problems of energy efficiency. Induction motors are the most common type of electromechanical energy converters, and a significant part of them operate under conditions of periodic changes in the load torque. The work is devoted to solving the problem of increasing the energy efficiency of asynchronous motors of electromechanical systems with a periodic load, including pumping and compressor equipment. The traditional solution to this problem for compressor equipment is the optimal design of an IM under static conditions, as well as the use of flywheels, the use of an IM with an increased slip value and controlled IM with a squirrel-cage rotor and with frequency converters. In this work, the modes of operation of asynchronous motors with periodic loading are investigated. For this, complex mathematical models are developed in the simulation system. Such models are effective in modeling taking into account periodic load changes: repetitive transient processes, their possible asymmetry and non-sinusoidality, increased influence of nonlinearity of electromagnetic parameters. In complex mathematical modeling, the mutual influence of the constituent parts of the electromechanical system is taken into account. Simulation allowed quantifying the deterioration in energy efficiency under intermittent loading, in comparison with static modes. Criteria for evaluating quasi-static modes have been developed and areas of critical decrease in efficiency have been determined. The paper proposes and demonstrates a methodology for solving this problem. For this purpose, tools have been created for the optimal design of asynchronous motors as part of electromechanical systems with periodic loading. These tools include: complex mathematical models of electromechanical systems with asynchronous motors with periodic load, mathematical tools for determining the parameters of quasi-steady-state modes, the methodology of optimal design based on the criterion of the maximum efficiency of processes under quasi-steady-state modes of operation. The possibilities, advantages and prospects of using the developed mathemati-cal apparatus for solving a number of problems to improve the efficiency of electric drives of compressor and pumping equipment are demonstrated. It is shown that by taking into account quasi-static processes, the use of complex mathematical models for the optimal design of asynchronous motors with a periodic load provides an in-crease in efficiency up to 8 ... 10%, relative to the indicators of motors that are de-signed without taking into account the quasi-static modes. The areas of intense quasi-steady-state modes are determined using the devel-oped criterion. In these areas, there is a critical decrease in efficiency compared to continuous load operation. A decrease in efficiency is associated with a decrease in the amount of kinetic energy of the rotating parts compared to the amount of electromagnetic energy. In connection with the development of a frequency-controlled asynchronous drive of mechanisms with a periodic load, the relevance of design taking into account the peculiarities of quasi-static has increased significantly. For example, a variable frequency drive of a refrigerator compressor or a heat pump can increase energy efficiency up to 40%, but at low speeds, due to a decrease in kinetic energy, the efficiency can decrease to 10 ... 15%, unless a special design methodology is applied. This problem can be solved by using the complex mathematical modeling tools developed in the article.
Conference papers on the topic "Slip-Critical Connection"
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Jalalpour, Mohammad, Mahmoud Reda Taha, and Eric Austin. "Correlating Shear Slip and Contact Pressure for Health Monitoring of Bolted Joints in Aerospace Structures." In ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2010. http://dx.doi.org/10.1115/smasis2010-3885.
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Bolted joints are critical components in aerospace structures. Checking the integrity of these connections, although time consuming, is a necessary step before launching aerospace vehicles and satellites. Recent advances in structural health monitoring (SHM) suggest the possible use of SHM technologies to assess the integrity of these joints. Moreover, there exists a need for continuous monitoring of aerospace structures after launching. This continuous monitoring requires relating damage features that can be extracted using sensing techniques (e.g. ultrasonic methods) to physical quantities representing the structural integrity of bolted joints typically related to contact pressure. This paper describes an experimental effort to correlate shear slip measurements of a bolted connection to contact pressure. The contact pressure map (spatial distribution of contact pressure) is calibrated to the torque applied to the bolted connection. Loading and unloading experiments on the joint allowed separating elastic and shear slip displacements. Shear slip is then correlated to contact pressure maps. Further efforts are underway to connect these measures to SHM metrics.
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Hellum, Vidar, Songxiong Ding, and Tom Lassen. "Fatigue of Mooring Chains Connected to Offshore Floating Structures Considering Out of Plane Bending Effects." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-96114.
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Abstract Reliability against fatigue fracture is an issue of major concern in the design of offshore mooring systems with chain segments. The present paper describes the investigation of the effect of OPB (out of plane bending) and IPB (in plane bending) loading modes on the fatigue performance of chain links in critical positions. The hang-off design at the floater is based on long rods with bearings at the connection points to the floating structure. The purpose of the paper is to shed some light on possible design improvements on the connection design when using the available design guidelines for calculation of combined Tension-Bending fatigue in the mooring line. A challenge when using the existing design guidelines is that they often predict very short fatigue lives for what used to be a conventional hang-off design. A possible method for mitigating this is to improve the connection design so that the interlink angles could be reduced due to the slip in the bearings in the end of the rod. This would lower the bending stress to be occurred in those critical links. The present paper investigates the optimum length connecting rods and friction in the bearing on the fatigue lives of top mooring chains. A case study for 125 mm mooring chain and a pretension of 1200 kN is included. A non-linear beam model established according to the BV guidelines showed good ability to model the behavior of the 125 mm chain observed during the test. It is however a challenge to select the right interlink rotational stiffness and the correct bearing friction coefficient. An optimization analyses demonstrated that a rod length should be minimum 3 meters and the friction coefficient should be down to 0.15.
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Zadoks, Rick I., and Xiong Yu. "A Preliminary Study of Self-Loosening in Bolted Connections." In ASME 1993 Design Technical Conferences. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/detc1993-0034.
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Abstract Bolted connections are the most common method used to fasten together two or more structural elements. After fatigue, self-loosening is the most frequent cause of failure of dynamically loaded bolted connections. Bolted connections experience self-loosening due to relative motion between the thread flanks and between other contact surfaces of the clamped or clamping elements. If the relative motions are eliminated, then no dynamic self-loosening can occur. It is found that the relative transverse motion d at a bolted connection is directly related to the preload Q and the transverse force F applied to the bolt. As a basis for the study of bolt self-loosening, a model of thread slipping is established, and relationships between Q, F and d are theoretically derived. It is found that the stiffness of the bolt threads is approximately parabolic. Due to this nonlinear relationship between Q and d, it is found that the relationship between F and d is also nonlinear. For a given set of geometrical and material parameters, the critical transverse force Fcr (i.e., the minimum force needed to make the threads slip) can be predicted. Experiments are run and though the results are obscured by the presence of other effects including sliding friction between the clamped parts and bending of the bolt body, it seems that qualitative agreement exists between the theoretical model and a physical system. The results presented in this work serve as the preliminaries to the development of a model of the dynamic self-loosening of bolted connections and, as such, offer an insight into the mechanisms that lead to self-loosening. Additionally, these results offer clues regarding methods that could be used to prevent bolted connection failures.
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Fadden, Matthew, Asad Hayatdavoudi, and Abdenour Seibi. "High Performance Surface Coatings for Bolted Slip-Critical Connections." In Structures Congress 2015. American Society of Civil Engineers, 2015. http://dx.doi.org/10.1061/9780784479117.181.
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Liao, Jun, Renwei Mei, and James F. Klausner. "A Study on Numerical Instability of Inviscid Two-Fluid Model Near Ill-Posedness Condition." In ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72652.
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The two-fluid model is widely used in studying gas-liquid flow inside pipelines because it can qualitatively predict the flow field at low computational cost. However, the two-fluid model becomes ill-posed when the slip velocity exceeds a critical value, and computations can be quite unstable before flow reaches the unstable condition. In this study computational stability of various convection schemes for the two-fluid model is analyzed. A pressure correction algorithm for inviscid flow is carefully implemented to minimize its effect on numerical stability. Von Neumann stability analysis for the wave growth rates by using the 1st order upwind, 2nd order upwind, QUICK, and the central difference schemes shows that the central difference scheme is more accurate and more stable than the other schemes. The 2nd order upwind scheme is much more susceptible to instability at long waves than the 1st order upwind and inaccurate for short waves. The instability associated with ill-posedness of the two-fluid model is significantly different from the instability of the discretized two-fluid model. Excellent agreement is obtained between the computed and predicted wave growth rates. The connection between the ill-posedness of the two-fluid model and the numerical stability of the algorithm used to implement the inviscid two-fluid model is elucidated.
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Jiao, Weifeng, Yiyi Chen, and Wei Wang. "Tests on Beam to CFT-RHS Column Connections Applying Slip-Critical Blind Bolts." In Proceedings of the 17th International Symposium on Tubular Structures(ISTS17). Research Publishing Services, 2019. http://dx.doi.org/10.3850/978-981-11-0745-0_011-cd.
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Bonanni, L., C. Carcasci, B. Facchini, and L. Tarchi. "Experimental Survey on Heat Transfer in a Trailing Edge Cooling System: Effects of Rotation in Internal Cooling Ducts." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69638.
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The high thermal loads, the heavy structural stresses and the small thickness required for aerodynamic performances make the trailing edge cooling (TE) cooling of high pressure gas turbine blades a critical challenge. The presented paper point out an experimental study focusing the aerothermal performance of a TE internal cooling system of a high pressure gas turbine blade, evaluated under stationary and rotating conditions. The investigated geometry consists of a 30:1 scaled model reproducing the typical wedge shaped discharge duct with one row of enlarged pedestals. The airflow pattern inside the device simulates a highly loaded rotor blade cooling scheme with a 90° turning flow from the radial hub inlet to the tangential TE outlet. Two different tip configurations were tested, the first one with a completely closed section, the second one with 5 holes on the tip outlet surfaces discharging at ambient pressure. To investigate the rotation effects on the trailing edge cooling system performance, a rotating test rig was purposely developed and manufactured. The test rig is composed by a rotating arm that holds the PMMA TE model and the instrumentation. A thin Inconel heating foil and wide band Thermo-chromic Liquid Crystals are used to perform steady state heat transfer measurements. A rotary joint ensures the pneumatic connection between the blower and the rotating apparatus, moreover several slip rings are used for both instrumentation power supply and thermocouple connection. Heat transfer coefficient measurements were made with fixed Reynolds number close to 20k in the hub inlet section and with variable rotating speed in order to set the Rotation number from 0 (non rotational test) up to 0.3. Six different configurations were tested: two different tip mass flow rates (the first one with a completely closed tip, the second one with the 12.5% of the inlet flow discharged from the tip) and three different surface conditions: the first one consists in the flat plate case and the others in two ribbed cases, with different angular orientation (60° and −60° respect to the radial direction). Results are reported in terms of detailed heat transfer coefficient 2D maps on the suction side surface as well as span-wise profiles inside the pedestal ducts. The reported work has been supported by the Italian Ministry of Education, University and Research (MIUR).
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Mora, Silvia, and Damian Martinez. "Drilling in Slips: Strategies to Measure the Invisible Lost Time, Technical Limits Definition, Using Standard Analytics and Machine Learning Algorithms." In SPE/IADC Middle East Drilling Technology Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/202086-ms.
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Abstract Drilling is probably the most critical, complex, and costly operation in the oil and gas industry and unfortunately, errors made during the activities related are very expensive. Therefore, inefficient drilling activities such as connection duration outside of optimal times can have a considerable financial impact, so there is always a need to improve drilling efficiency. It is for this fact, that the measure of different behaviors and the duration of the drilling activities represent a significant opportunity in order to maximize the cost saving per well or campaign. Reducing the cost impact and maximizing the drilling efficiency are defined by the way used to calculate the perfect well time by the technical limit, non-productive time (NPT), and invisible lost time (ILT), in an operating company drilling plan. Different approaches to measure the invisible lost time that could be present in the in slips activity on the drilling operation are compared. Results show the differences between multiple techniques applied in real environments coming from a cloud platform. The methodologies implemented are based on the following scenarios, the first one use a combination of a custom technical limit based on technical experience, the historical data limit using standard measures (mean, average, quartiles, standard deviation, etc.), and a depth range variable (phases) differentiation, initial, intermediate, and final hole sizes is used. A complexity comparison uses the rig stand and phase footage variables for base line (count and duration) definition per phase, the non-productive time activities exclusion and data replace techniques mixing with an out of standard time detection in slips behavior (motor assemblies, bit replacing, bottom hole assembly (BHA), etc.) using standard and machine learning mechanisms. A final methodology implements an in slip ILT by technical limit definition using machine learning. The results using the same data set (set of wells) and coming from the different methods has been evaluated according to the total invisible lost time calculated per phase, percentage of activities evaluated with invisible lost time per phase and the variation of ILT considering the activities defining the technical limit. Finally, the potential implementation by any operator can be evaluated for these methodologies according to their specific requirements. This analysis creates a guideline to operating companies about multiple techniques to calculate ILT, some using innovative procedures applied on machine learning models.