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Journal articles on the topic 'Post-tensioned Slab'

Author: Grafiati

Published: 10 June 2021

Last updated: 4 February 2022

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1

Yang, Xiao Hua, Chao Yang Zhou, Xue Jun He, and Teng Chen. "Research on Post-Tensioned Unbonded Prestressed Concrete Hollowed Floor." Applied Mechanics and Materials 94-96 (September 2011): 1456–62. http://dx.doi.org/10.4028/www.scientific.net/amm.94-96.1456.

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In order to study the mechanical behaviors of post-tensioned unbonded prestressed concrete hollowed floors, a 1/4 scale post-tensioned unbonded prestressed reinforced concrete hollow slab-column structure model is used to act uniform distributed load on the floor. The test results showed that the load carrying capacity is enough. The points of maximum displacement are at the centers of slabs. By means of the experimental studies and elastic finite element analysis methods, the results showed that post-tensioned unbonded prestressed concrete hollowed floor presents anisotropy with layout of circular-tubes in one way. In direction parallel to layout of hollowed tubes, the continuity of floor is destruction and bending stiffness of slab is weakened. For studying the deformations of slab, it can still be considered continuous cross-slab in two directions.

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2

Barkaya, T. R., A. V. Gavrilenko, V. V. Fedorov, and P. V. Kulyaev. "EXPERIMENTAL STUDY OF PUNCHING SHEAR OF UNBONDED POST-TENSIONED REINFORCED CONCRETE SLABS." Bulletin of the Tver State Technical University. Series «Building. Electrical engineering and chemical technology», no. 4 (2020): 6–14. http://dx.doi.org/10.46573/2658-7459-2020-4-6-14.

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In this paper there are results of a punching shear test of slab samples, which were modeling post-tensioned reinforced concrete floor slabs when they are punched by columns. Geometrical dimensions of slab samples and properties of used materials are listed as well. There were 4 series of samples which differed to each other by level of prestress. Load have been applied through stamps of several types, which have allowed to research different positions of tensioned reinforcement relatively to the punching pyramid. Obtained results are discussed. Recommendations, which compliance may allow to obtain positive effect in ultimate punching shear loads for unbonded post-tensioned slabs are given.

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3

Tur, Andrei V. "Large-Size Jointless Concrete Slab-on-Grade with Combined Prestressing." Solid State Phenomena 309 (August 2020): 201–7. http://dx.doi.org/10.4028/www.scientific.net/ssp.309.201.

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In the international and national practice of design, a different type of slab on the various types of grade are becoming increasingly common. For such structural elements, shrinkage and temperature influences in combination with low tensile stress, mainly in early age, leads to the risk of cracking in reinforced concrete structures, and as result, a reduction of its durability. The present article describes some of the possible ways of usage of the post-tensioned flat slabs and the rational design procedures to provide their structural reliability. The theoretical background of the punching resistance checking, in the case when the piles support the foundation post-tensioned slabs, presented. For ground floor slabs, an iterative method is given for determining design compression pre-stresses distribution in slab sections, taking into account the restrained effect created by the friction shear stresses in contact between the slab and the base. Besides, the article presents some practical implementations of the post-tensioned slabs as an artificial base in the presence of weak soils and as a large-size ground floor (slab-on-grade) without any joints.

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4

K, Hridya. "Effect of Location of Shear wall on Torsional Performance of Symmetric and Asymmetric High Rise Building." International Journal for Research in Applied Science and Engineering Technology 9, no. VI (June 30, 2021): 5237–43. http://dx.doi.org/10.22214/ijraset.2021.36160.

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Torsion force is a load that is a applied to a building through torque. The torque applied creates a shear stress. If a torsion force is large enough, it can cause a building to undergo a twisting action. The main aim of the project is to study the effect of location of shear wall on torsional performance of symmetric and asymmetric high-rise building ,post tensioned slabs are being used in the construction of building hence the thesis also analyze these post tensioned slab structures by changing shear wall configuration. Post tensioned slab structures have weak resistance to lateral loads. so to provide stiffness to structures against lateral forces shear walls are used. A study of 30 storey building in zone III, is considered and determine various parameters like base shear, storey drift, and storey displacement.post-tensioning is a mature technology as it provide efficient, economic and elegant structural solutions for a wide range of applications. Post-tensioned flat slab could be a better option compared to RCC flat slab, in respect of the cost of project and time of construction. ETABS 2017 software is used for the analysis.

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5

Mohammed, Abbas Haraj, Khattab Saleem Abdul-Razzaq, Taha Khalid Mohammedali, Dia Eddin Nassani K., and Ali K. Hussein. "Finite Element Modeling of Post-Tensioned Two-Way Concrete Slabs under Flexural Loading." Civil Engineering Journal 4, no. 1 (February 7, 2018): 1. http://dx.doi.org/10.28991/cej-030964.

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Post-Tensioned (PT) method is a widely used technique to prevent cracking and to minimize the deflection which is resulted by loads. In this method, stress is applied after concrete placing and reach adequate hardening and strength. This paper investigates the structural behaviour of PT two-way concrete slabs. The main objective of this study involves a detailed flexural behavior analytical investigation of PT concrete two-way slab with the different bonded tendon layout. This will be achieved by non-linear Finite Element (FE) analysis programs method, to choose the most effective and optimum position of tendon layout with different number of tendons and applied load on the concrete two-way slab. A parametric study was conducted to investigate the effect of tendons layout on the overall behavior of post-tensioned two-way concrete slab. The result obtained from finite element analysis showed that the failure load in PT in both directions increased about 89 % as compared with slab PT in one direction.

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6

Yoon, Sung-Won. "Dynamic Characteristic of Post-tensioned Void Slab." Journal of the Korean Association for Spatial Structures 12, no. 3 (September 15, 2012): 89–95. http://dx.doi.org/10.9712/kass.2012.12.3.089.

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7

Mieszczak, Małgorzata, and Lucyna Domagała. "Lightweight Aggregate Concrete as an Alternative for Dense Concrete in Post-Tensioned Concrete Slab." Materials Science Forum 926 (July 2018): 140–45. http://dx.doi.org/10.4028/www.scientific.net/msf.926.140.

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The paper presents the results of tests conducted on two lightweight aggregate concretes made of new national Certyd artificial aggregate. This research is intended to first application of lightweight concrete to construct large-span post-tensioned slab. In addition to mechanical properties development, shrinkage and creep during 3 months of loading were tested. The obtained results are compared with theoretical results predicted by standard. Conducted tests indicated, that measured values of shrinkage and creep are significantly lower than predicted ones. This is promise for application of tested concrete in construction of post-tensioned slabs.

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8

Scollard, C. R., and F. M. Bartlett. "Rehabilitation criteria for post-tensioned voided-slab bridges." Canadian Journal of Civil Engineering 31, no. 6 (December 1, 2004): 977–87. http://dx.doi.org/10.1139/l04-057.

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Current rehabilitation practices for aging, post-tensioned, voided-slab bridges typically reduce the geometric properties of the concrete cross section and so permanently increase post-tensioning stresses, change primary and secondary prestress moments, and create new primary and secondary moments because the original concrete restrains shrinkage of the new concrete. These changes affect the resistance of the rehabilitated bridge at limit states specified for new construction in the Canadian Highway Bridge Design Code (CHBDC) and may cause other limit states not currently identified in the CHBDC to govern. Rehabilitation schemes should be checked for a serviceability limit state of tensile stresses due to permanent service loads that exceed the cracking strength of the original concrete, which is typically not detailed to control crack widths. Ultimate limit states to check are (i) flexural resistance over interior supports, where the total factored demand can be increased markedly by the rehabilitation; and (ii) creep-initiated failure of concrete due to permanent compressive stresses. The application of these procedures is illustrated through example calculations for a typical continuous bridge.Key words: post-tensioned concrete, serviceability, ultimate limit state, restrained shrinkage, secondary prestress moments, critical stress, cracking.

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9

Pandey, M. D., and M. A. Nessim. "Reliability-based inspection of post-tensioned concrete slabs." Canadian Journal of Civil Engineering 23, no. 1 (February 1, 1996): 242–49. http://dx.doi.org/10.1139/l96-025.

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In unbonded, post-tensioned prestressed concrete slabs and beams, corrosion of prestressed tendons due to moisture ingress and their subsequent breakage has been identified as a major problem raising serious concern over the safety of aged structures. The paper presents a practical Bayesian approach to reliability assessment of such structures based on the inspection of a randomly selected sample of prestressing tendons. To minimize inspection costs, clear guidelines are presented for selecting the minimum sample size necessary to demonstrate that the annual probability of failure of an existing structure is below the target value of 10−5, implied in the Canadian Standards Association concrete design code CAN3-A23.3-M84. A systematic and cost-effective incremental strategy is developed for inspection of existing prestressed concrete structures. Key words: reliability, Bayes theorem, prestressed concrete, unbonded post-tensioned system, inspection, corrosion, probability distribution, CSA Standard CAN3-A23.3-M84, slab.

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10

Llombart Jaques, José Antonio, and Jordi Revoltós Fort. "Edificios con forjados postesados mediante tendones no adherentes. Edificio Mapfre-Vía Augusta, en Barcelona-España." Informes de la Construcción 46, no. 432 (August 30, 1994): 19–30. http://dx.doi.org/10.3989/ic.1994.v46.i432.1123.

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11

Zhou, Zhen, Shao-Ping Meng, and Zhao Liu. "Longitudinal anti-cracking analysis for post-tensioned voided slab bridges." Structural Engineering and Mechanics 43, no. 4 (August 25, 2012): 459–73. http://dx.doi.org/10.12989/sem.2012.43.4.459.

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12

Rath, Soubhagya Ranjan, Susanta Kumar Sethy,, and Mukesh Kumar Dubey. "Comparative Study on Analysis and Designing of Post-Tensioned Flat Slab Vs Conventional Slab." International Journal of Research in Advent Technology 7, no. 5 (June 10, 2019): 192–98. http://dx.doi.org/10.32622/ijrat.75201947.

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13

Lee, Ju Dong, Jang Keun Yoon, and Thomas H. K. Kang. "Combined half precast concrete slab and post-tensioned slab topping system for basement parking structures." Journal of Structural Integrity and Maintenance 1, no. 1 (January 2, 2016): 1–9. http://dx.doi.org/10.1080/24705314.2016.1153281.

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14

Moldovan, Ilinca, and Aliz Mathe. "A Study on a Two-Way Post-Tensioned Concrete Waffle Slab." Procedia Technology 22 (2016): 227–34. http://dx.doi.org/10.1016/j.protcy.2016.01.072.

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15

Rath, Soubhagya Ranjan, Susanta Kumar Sethy,, and Mukesh Kumar Dubey. "Review Paper on Post-Tensioned Flat Slab with Drop Panels and Its Comparison with Conventional Slab." International Journal of Research in Advent Technology 7, no. 4 (April 10, 2019): 463–65. http://dx.doi.org/10.32622/ijrat.742019163.

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16

Ahn, Byeonguk, Thomas H. K. Kang, Su-Min Kang, and Jang Keun Yoon. "Punching Shear Stress in Post-Tensioned Transfer Plate of Multi-Story Buildings." Applied Sciences 10, no. 17 (August 31, 2020): 6015. http://dx.doi.org/10.3390/app10176015.

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The design of a post-tensioned transfer plate is typically controlled by shear force—in particular, punching shear at the slab-column connection. To verify the accuracy of the separated model only for one floor currently used in the design of a post-tensioned transfer plate, results were compared to a complete model with multi-story building system for which two representative residential building plans were used to emulate physical structural systems. Punching shear stress for the separated model was calculated using the eccentric shear stress model presented in ACI 318. Punching shear stress was found to be overestimated in the separated model, given that interaction between transfer plates and upper shear walls cannot be reflected therein. Differences at column locations were also noted as the number of stories below the transfer floor increased. Consequently, the separated model is not recommended for design of post-tensioned transfer plates. A complete model is more suitable for more realistic and potential cost-effective design, through the inclusion of the interaction between transfer plates and upper shear walls.

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17

Ahmed, Nasser. "NUMERICAL STUDY ON ANCHORAGE ZONES OF POST-TENSIONED SLAB CONSIDERING ANCHORAGE DEVICE." International Journal of GEOMATE 19, no. 74 (October 1, 2020): 123–30. http://dx.doi.org/10.21660/2020.74.12801.

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18

Chou, Chung-Che, and Jun-Hen Chen. "Development of floor slab for steel post-tensioned self-centering moment frames." Journal of Constructional Steel Research 67, no. 10 (October 2011): 1621–35. http://dx.doi.org/10.1016/j.jcsr.2011.04.006.

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19

Abdulamier, Jamal, Ali Aziz, and Haider Al-Assam. "Non-Linear Behavior of Unbonded Post-Tensioned one-way Concrete Slab Panel." Journal of Environmental Studies 10, no. 1 (March 1, 2013): 39–45. http://dx.doi.org/10.21608/jesj.2013.190291.

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20

Dilger, Walter H., and Marwan Shatila. "Shear strength of prestressed concrete edge slab–column connections with and without shear stud reinforcement." Canadian Journal of Civil Engineering 16, no. 6 (December 1, 1989): 807–19. http://dx.doi.org/10.1139/l89-124.

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Results are reported of tests to failure on six full-scale unbonded post-tensioned prestressed concrete slab–edge column specimens. The objective is to study experimentally the strength and behaviour of this type of connections. The variables are quantity and distribution of stud shear reinforcement and length of overhang. The relevant design equations suggested by Dilger and Ghali as well as several models by others for predicting the strength of prestressed concrete slab–edge column connections are compared with test results. It is concluded that the ACI and CSA provisions for predicting the strength of such connections are conservative, and that the presence of stud shear reinforcement is a good means of increasing the strength and ductility of this type of connections. Key words: shear strength, flat slabs, prestressed concrete, unbonded tendons, shear reinforcement, design, ductility.

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21

Gąćkowski, Roman, and Jacek Selejdak. "Assessment of the Effect of the Pre-cast Beams IG Axial Spacing on the Effort Bridge Span." Quality Production Improvement - QPI 1, no. 1 (July 1, 2019): 281–88. http://dx.doi.org/10.2478/cqpi-2019-0038.

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Abstract In designing of reinforced concrete bridges are often used pre-cast of pre-tensioned or post-tensioned prestressed members. In professional practice, when designing bridge span pre-cast of pre-tensioned prestressed beams IG type, different axial beams spacing’s are used and they are joined by a reinforced concrete slab. The paper presents a comparative analysis of an influence of the axial spacing of IG type beams in the cross-section of the bridge, on the bridge span effort, using standards PN-85/S-10042 and PN-EN 1992-2:2010. The optimal axial spacing of pre-cast IG type beams is presented, while maintaining the standard conditions of ULS (Ultimate Limit State). Such a solution has a positive impact on the costs of the entire project, significantly lowering the global investment cost.

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22

Raj, Ranjana. "Analysis of RC Framed Post Tensioned Slab Structure to Evaluate the Performance of Floating Column with and without Shear Wall using ETABS." International Journal for Research in Applied Science and Engineering Technology 9, no. VI (June 30, 2021): 5279–86. http://dx.doi.org/10.22214/ijraset.2021.36201.

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This research aims to develop analytical study of post tensioned slab with floating column. In present scenario buildings with floating columns are of typical feature within the fashionable multi storey construction practices in urban India. Such sorts of constructions are highly undesirable in building inbuilt seismically active areas. For this buildings are given floating columns at one or more storey. These floating columns are highly disadvantageous during a building inbuilt seismically active area. The earthquake forces that are developed at different floor levels during a building got to be carried down along the peak to the bottom by the shortest path. Deviation or discontinuity during this load transfer path leads to poor performance of the building. In this paper, analytical study of post tensioned slab to evaluate the performance of floating column at ground level or at alternative story for G + 10 story building without shear wall, shear wall at corner, shear wall at center, shear wall at external middle and combined shear wall are provided for regular building is taken for study. The response of building like storey drift, storey displacement and storey shear has been wont to evaluate the results obtained using ETABS software.

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23

Mahrous, Amgad, Mariam Ehab, and Hamed Salem. "Progressive collapse assessment of post-tensioned reinforced concrete flat slab structures using AEM." Engineering Failure Analysis 109 (January 2020): 104278. http://dx.doi.org/10.1016/j.engfailanal.2019.104278.

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24

O’ Connor, A., and Ib Enevoldsen. "Probability based modelling and assessment of an existing post-tensioned concrete slab bridge." Engineering Structures 30, no. 5 (May 2008): 1408–16. http://dx.doi.org/10.1016/j.engstruct.2007.07.023.

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25

Mynarcik, Petr. "The Subsidence Analysis of Experimental Post-Tensioned Concrete Slab Model in the Course of the Static Load Test." Applied Mechanics and Materials 744-746 (March 2015): 1556–59. http://dx.doi.org/10.4028/www.scientific.net/amm.744-746.1556.

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This article presenting results of subsidence measurement on experimental post-tensioned concrete slab model during static load test. This subsidence measurement was realized on the large scale concrete slab model and brought important data for computer modeling by FEM (finite element method). The experiment simulated the load effect of the base plate of heavy rack. In the course of the static load test subsidence was measured by set of potentiometric gauges at the particular points in real time. The experiment continue on research activity focused on problematic of interaction between concrete structures and subsoil and was realized at the Faculty of Civil Engineering, VSB – Technical University of Ostrava, Czech Republic.

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26

Han, Sang Whan, Ki Hoon Moon, and Young-Mi Park. "Effect of slab bottom reinforcement on seismic performance of post-tensioned flat plate frames." Magazine of Concrete Research 64, no. 4 (April 2012): 317–34. http://dx.doi.org/10.1680/macr.11.00012.

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27

Chou, Chung-Che, and Jun-Hen Chen. "Seismic tests of post-tensioned self-centering building frames with column and slab restraints." Frontiers of Architecture and Civil Engineering in China 5, no. 3 (September 2011): 323–34. http://dx.doi.org/10.1007/s11709-011-0119-5.

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28

Prawatwong, Unnop, Pennung Warnitchai, and Chondro Hidayat Tandian. "Seismic Performance of Bonded Post-Tensioned Slab-Column Connections with and without Drop Panels." Advances in Structural Engineering 15, no. 10 (October 2012): 1653–72. http://dx.doi.org/10.1260/1369-4332.15.10.1653.

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29

Mohammed, Abbas H., Dia Eddin Nassani, Nildem Tayşi, and Ali K. Hussein. "Nonlinear Finite Element Model for the Optimization of Post-Tensioned One-Way Concrete Slab." KSCE Journal of Civil Engineering 22, no. 7 (May 8, 2018): 2519–27. http://dx.doi.org/10.1007/s12205-018-0488-6.

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30

Yazdani, Sina, Sina Asadollahi, Parham Shoaei, and Mehdi Dehestani. "Failure stages in post-tensioned reinforced self-consolidating concrete slab strengthened with CFRP layers." Engineering Failure Analysis 122 (April 2021): 105219. http://dx.doi.org/10.1016/j.engfailanal.2021.105219.

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31

Yang, Xiao Hua, Chao Yang Zhou, Xue Jun He, and Zhi Qing Yang. "Experimental Studies on Bearing Capacity of Post-Tensioned Unbonded Prestressed Concrete Hollowed Floors." Advanced Materials Research 368-373 (October 2011): 159–63. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.159.

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A 1/4 scales four-storey model of post-tensioned unbonded prestressed concrete hollow slab-column structure has been made to do the ultimate load test on the second-storey floor. By measuring the floor deflection, stresses of steel bars and cracks of floors, the bearing capacity of floor is explored. The bearing capacity tests of floor are divided into three stages: elastic stage, crack growth stage and destruction stage. Based on the test results and crack developments in floor, a improved plastic hinge model is carried out to predict the ultimate loads. The calculated results of the ultimate loads with improved plastic hinge model are in good agreement with the experiment data.

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32

Mordak, Arkadiusz, and Zbigniew Mańko. "Research of post-tensioned concrete composite spans with Π-beams of road viaduct." MATEC Web of Conferences 174 (2018): 03015. http://dx.doi.org/10.1051/matecconf/201817403015.

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The paper is presented the results of research conducted on the posttensioned prestressed concrete spans made with precast Π-beams of part of seventh spans Eugeniusz Kwiatkowski road viaduct located in Gdynia (between supports no. 97-104) under static field load test. Heavy trucks were used as static loads. Superstructure (main beams), deck slab, and fixed and moving bearings, and also supports (abutment and piers) in both roadways of trestle were tested. Specification and range of conducted research are presented with analysis of results from the tests and calculation, which allowed to the estimate span structures behavior and their actual load-capacity before allow them to normal service on B-class of loads.

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33

Gogus, Aysegul, and John W. Wallace. "Fragility Assessment of Slab-Column Connections." Earthquake Spectra 31, no. 1 (February 2015): 159–77. http://dx.doi.org/10.1193/061812eqs220m.

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The development of fragility relations is an important step in the application of performance-based earthquake engineering. Data from 69 tests were collected and reviewed to develop fragility relations for new slab-column frame construction. Damage states were defined and fragility relations were developed for reinforced and post-tensioned concrete connections, both with and without shear reinforcement. Test results were reviewed to determine the likelihood and type of repair for various damage states. Derived empirical fragilities were incorporated into the ATC-58 loss estimation software Performance Assessment Calculation Tool (PACT). Nonlinear pushover analyses were conducted on test specimens and findings were compared to test results to assess bias in common modeling approaches. Comparisons indicate that the values of median model to test ratios vary between 0.9 and 1.25 for displacements corresponding to yield and for models with column stiffness based on ASCE 41-06 median stiffness at low axial loads of 0.2 EIgross.

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34

Moon, J. H., Y. C. Choi, J. H. Lim, L. H. Lee, K. H. Kwon, and K. S. Kim. "Post-Tensioned Interior Precast Wide Beam—Column Connections Subjected to Lateral Loading." Advances in Structural Engineering 10, no. 5 (October 2007): 487–500. http://dx.doi.org/10.1260/136943307782417654.

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The post-tensioned precast concrete system (PPS) developed in this study consists of U-shaped precast wide beams and concrete columns, where the continuity of wide beam-column joint is provided with the cast-in-place concrete on the U-shaped precast wide beam and the post-tensioning to the beam after casting of slab. The PPS structure can overcome the defect of discontinuity in the connections of precast members using cast-in-place concrete on precast members, and complement the low sectional efficiency of wide beam by applying the post-tensioning. In this study, an experimental investigation was performed with three half-scale specimens of interior connection fabricated employing PPS structure. Specifically, this paper presents the response of PPS interior beam-column joint subjected to cyclic lateral loading and evaluates the relevance of the beam-to-column width ratio criteria specified in ACI 318–05. The test results indicate that the PPS specimens can resist properly seismic loads maintaining overall structural integrity.

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35

Nagatani, Toshihiko, and Takeharu Tajiri. "Replacing the deck slab on a post-tensioned, prestressed-concrete composite girder bridge in Japan." Proceedings of the Institution of Civil Engineers - Forensic Engineering 172, no. 1 (February 1, 2019): 3–10. http://dx.doi.org/10.1680/jfoen.18.00013.

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36

Chou, Chung-Che, Yu-Chi Wang, and Jun-Hen Chen. "Seismic design and behavior of post-tensioned steel connections including effects of a composite slab." Engineering Structures 30, no. 11 (November 2008): 3014–23. http://dx.doi.org/10.1016/j.engstruct.2008.04.013.

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37

Shende, Shrawani A. "Comparative Study of Reinforced Cement Concrete Slab System v/s Post Tensioned Slab System with Reference to IS and ACI standards." International Journal for Research in Applied Science and Engineering Technology 7, no. 4 (April 30, 2019): 3047–54. http://dx.doi.org/10.22214/ijraset.2019.4511.

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38

Cheong, Kah Kian, Foo Wei Lee, Kah Hon Leong, Ming Kun Yew, and Yee Ling Lee. "Evaluation of Grouting Condition of Post-Tensioned Concrete using R-wave Method." E3S Web of Conferences 65 (2018): 02004. http://dx.doi.org/10.1051/e3sconf/20186502004.

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Post-tensioning (PT) system is widely used not only in bridge construction, but also used as a replacement of reinforced concrete (RC) structure for slab, beam, and wall. Nowadays, many countries around the world are focusing on sustainable development in the construction industry. PT system is one of a system which able to meet the standard of sustainable building construction. Its advantages are able to save more materials, construction time and maintenance cost. To ensure the safety of PT systems during construction, some methods are implemented to evaluate the concrete condition. In this study, the Rayleigh wave (R-wave) method is used to evaluate the grouting condition of the post-tensioned concrete structure. Useful parameters of R-wave such as amplitude, time, frequency and wave velocity are identified and obtained through a series of numerical simulations and experimental tests. Different frequencies are excited to examine the behavior of R-wave propagated through a concrete medium with different grouting conditions in the simulation. In experimental testing, different diameters of steel balls are used as an impactor to generate waveform and the generated waveforms were recorded by the data logger. Three equidistance receivers are placed on top of the tested concrete specimen with different duct materials of aluminium duct and PVC duct embedded in it. As a conclusion, when voids are present in the concrete specimen, high readings of amplitude and dominant frequency are recorded and the travelling wave velocity is slow.

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39

Noël, Martin, and Khaled Soudki. "Evaluation of fibre-reinforced polymer post-tensioned slab bridges using the Canadian Highway Bridge Design Code." Canadian Journal of Civil Engineering 39, no. 3 (March 2012): 249–58. http://dx.doi.org/10.1139/l11-126.

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40

Park, Young Mi, Sang Whan Han, and Jong Hyuk Ryu. "Comparison of Seismic Behaviors of Interior Joints in PT and RC Flat Plate Systems." Key Engineering Materials 348-349 (September 2007): 741–45. http://dx.doi.org/10.4028/www.scientific.net/kem.348-349.741.

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The purpose of this study is to compare the seismic behaviors of interior post-tensioned (PT) and reinforced concrete (RC) flat plate slab-column connections designed to resist only gravity loads. In general, flat plate systems have been used to support gravity loads, which should be constructed with lateral system such as shear walls or moment frames. Flat plate systems should retain the ability to undergo the lateral drift associated with the lateral system without loss of gravity load carrying capacity. Although these systems are common, relatively little experimental study has been conducted to assess actual behavior under lateral loads. Therefore, this study was undertaken to assess the seismic performance of two PT and one RC slab-column interior connection under high gravity loads. This study observed that PT connections had a better seismic performance than corresponding RC connections in terms strength, deformability, energy absorption.

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Choi, Kwang-Ho, and Joong-Won Lee. "A Study on the Structural Performance of Post Tensioned Concrete Beam and Slab Subjected to High Temperature." Journal of the Korea Concrete Institute 29, no. 2 (April 30, 2017): 217–23. http://dx.doi.org/10.4334/jkci.2017.29.2.217.

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Nishat, Tahsin Afroz Hoque, and Raquib Ahsan. "Sensitivity analyses of the optimum design parameters of prestressed post-tensioned I-girder and deck-slab system." Asian Journal of Civil Engineering 21, no. 8 (August 8, 2020): 1463–81. http://dx.doi.org/10.1007/s42107-020-00291-7.

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Fadlelbari, M. Faisal. "Efficiency of Vierendeel Girder, Post-tensioned Girders and Steel Beams for Long Cantilevers in Buildings." FES Journal of Engineering Sciences 9, no. 1 (February 22, 2021): 79–85. http://dx.doi.org/10.52981/fjes.v9i1.662.

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Cantilevers are a part of our life, they are everywhere: bridg–es, building’s balconies, traffic signs, car parking shades even the aircraft’s wings. The long cantilevers of the buildings always present as a big challenge to structural engineers in their practice life. The structural behavior of these cantilevers depends on a several factors, such as rigidity of the slab, rigidity of columns or walls, span continuity... etc. But the real dilemma lies in the economical choice. This paper focused on the cantilever’s structural analysis according to the used structural. Moreover, it shows a comparison between three structural system choices: Vierendeel Girder, Post - Tensioned Girders and Steel Composite Beam in a graph. The objective of this paper is to give a guideline to the structural engineers to choose the optimum system of the building cantilevers according to the factors mentioned earlier. At the end, the paper illustrated the Vierendeel girder is the most efficient system for cantilevers. Accordingly, recommendations result on that up to 4.0 m cantilever length steel beams will be enough, for more than 4.0 and less than or equal to 6.0 m post-tension is recommended, and for more than 6.0 m cantilever we should use Vierendeel girder.

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Strydom, Johnnie, Etienne du Plessis, and Lourens Pieters. "Rehabilitation of the Komati River Bridge B1604." MATEC Web of Conferences 199 (2018): 10005. http://dx.doi.org/10.1051/matecconf/201819910005.

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In this paper, the retrofitting and rehabilitation of the Komati River Bridge, Bridge B1604 on the N4 in Mpumalanga, South Africa, is presented. The bridge consists of 17 simply supported spans, 20 metres in length, with a post-tensioned beam and slab deck. The deck is supported on steel bearings, and the abutments are of the spill through reinforced concrete type. The wall type piers are founded on shallow rock with pad footings. The bridge was constructed in 1940, and in 1998 the deck was widened on both sides with larger pre-cast, post-tensioned beams. SMEC South Africa under a Trans African Toll Concessions (TRAC) appointment inspected the bridge in 2014 as part of South African National Roads Agency’s (SANRAL) routine bridge inspections. It was found that the old beams had extensive bending cracks. The cracks were mainly caused by locked in loads due to the jamming of the steel bearings. The rehabilitation design was completed by SMEC South Africa and was implemented by DSC Zendon cc with TRAC as the client in 2017. The repairs included the replacement of 272 steel bearings with elastomeric bearings, crack injection and carbon fibre strengthening of 68 deck beams. DSC Zendon cc utilised mobile platforms to access the soffit of the deck. Hanging platforms were used to minimise the impact on the Komati River and its crocodiles.

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Kim, Min Sook, Kyong Min Ro, and Young Hak Lee. "An Experimental Study on the Performance of One-Way Slab Using Unbonded Post-Tensioned Anchorage for Single Tendon." Journal of The korean Association For Spatial Structures 19, no. 1 (March 15, 2019): 45–51. http://dx.doi.org/10.9712/kass.2019.19.1.45.

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Lin, Jian Jun, Denis Beaulieu, and Mario Fafard. "Parametric study on noncomposite slab-on-girder bridges with enforced frictional contact." Canadian Journal of Civil Engineering 21, no. 2 (April 1, 1994): 237–50. http://dx.doi.org/10.1139/l94-027.

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Using post-tensioned steel rods for strengthening noncomposite slab-on-steel girder bridges has the beneficial effects of both stabilizing the steel girders laterally and developing partial composite action longitudinally. The stabilizing effect and development of partial composite action are achieved by taking advantage of friction developed at the steel–concrete interface. A bridge reinforced by this technique is expected to have a higher load-carrying capacity and better load distribution under heavy traffic loads. Prestressed rods have been successfully used to strengthen 1/3 scale noncomposite bridge models in laboratory.The concrete slab-on-steel girder bridge models reinforced by prestressed rods are analyzed numerically in this paper by the use of the finite element method. Corresponding noncomposite models are also simulated for comparison to investigate the efficiency of this strengthening technique. The effects of variables such as the number of rods, prestressing level, type of load, slab thickness, steel girder slenderness, girder spacing, and ratio of radii of gyration of steel girders on the strengthening efficiency are studied by the finite element method. A full-scale bridge is analyzed to demonstrate the effect of the proposed reinforcing technique. Key words: bridge, composite action, contact, finite element, friction, parametric study, strengthening.

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Budi Wijaya, Gunawan. "Comprehensive condition assessment program on the fire damaged structure - a project case in Singapore." MATEC Web of Conferences 195 (2018): 02034. http://dx.doi.org/10.1051/matecconf/201819502034.

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A fire damaged structure at the eastern part of Singapore was assessed. Some concrete spalling exposing corroded steel reinforcements were noted on the post tensioned concrete beam and reinforced concrete slab, raising a concern about the structural integrity of the overall floor. A comprehensive condition assessment was performed on the affected structural elements to determine the extent of the damage, which included some on-site destructive and non-destructive tests as well as some laboratory testing on the collected concrete and steel samples. Testing data revealed that the concrete was still in consistently good condition with the average residual compressive strength of 36.51MPa. Petrographic examinations suggested that the top 5mm of the concrete surface might be exposed to a temperature not more than 450o C. The steel reinforcement and post tension strands were found to be still in good condition as well. The findings of this assessment will then be used for further structural assessment to determine the most effective structural rehabilitation program.

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Jayalakshmi Satyanarayanan, Arvind, Helen Santhi Mariadhas, and Prabu Dhanapalan. "Safety and Economy in the Design of Reinforced and Post-tensioned Slab Systems Using IS, BS, and ACI Standards." Practice Periodical on Structural Design and Construction 23, no. 3 (August 2018): 04018010. http://dx.doi.org/10.1061/(asce)sc.1943-5576.0000360.

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Díaz, J., S. Hernández, A. Fontán, and L. Romera. "A computer code for finite element analysis and design of post-tensioned voided slab bridge decks with orthotropic behaviour." Advances in Engineering Software 41, no. 7-8 (July 2010): 987–99. http://dx.doi.org/10.1016/j.advengsoft.2010.04.005.

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Viviescas Jaimes, Alvaro, Leonardo Herrera Rey, and Sebastián Arenas Páez. "Determinación de la capacidad resistente de puentes viga-losa en concreto postensado mediante pruebas de vibración ambiental: Caso de estudio Puente El Ramo." INGE CUC 13, no. 1 (January 1, 2017): 32–41. http://dx.doi.org/10.17981/ingecuc.13.1.2017.03.

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