Relevant bibliographies by topics / Pretensioni

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Pretensioni'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 February 2022

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Journal articles on the topic "Pretensioni"

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Salas Ferro, Percy. "Las pretensiones en el proceso contencioso administrativo." Revista Oficial del Poder Judicial. Órgano de Investigación de la Corte Suprema de Justicia de la República del Perú 7, no. 8/9 (November 1, 2020): 215–43. http://dx.doi.org/10.35292/ropj.v7i8/9.282.

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La pretensión es una de las instituciones centrales del proceso contencioso administrativo porque incide en su inicio, desarrollo y culminación. En el presente artículo el autor aborda, desde una perspectiva teórico-práctica, los aspectos fundamentales de cada una de las pretensiones que se pueden plantear en el proceso contencioso administrativo; entre ellas, la pretensión de nulidad o ineficacia; la pretensión de reconocimiento o restablecimiento del derecho; la pretensión de declaración contraria a derecho y cese de una actuación material; la pretensión de cumplimiento y la pretensión de indemnización. Con el propósito de contribuir a la adecuada formulación y evaluación de cada una de las pretensiones indicadas, se plantean algunos casos prácticos al final del trabajo
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He, Yong Jun, Xu Hong Zhou, and Yun Fei Zhang. "Research on Stability of Pretensioned Spherical Reticulated Mega-Structure." Applied Mechanics and Materials 351-352 (August 2013): 704–7. http://dx.doi.org/10.4028/www.scientific.net/amm.351-352.704.

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Pretensioned spherical reticulated mega-structure is studied in this paper. The cable arrangements and support styles of the main structure are first introduced. The static stabilities including the buckling mode and ultimate load of the pretensioned spherical reticulated mega-structure are then investigated by the ANSYS software. The influences of the key parameters such as the rise-span ratio, height of the 3D trussed beams, and the pretension value of cables on the structural stability are studied. And the optimal cable pretension values of the structures with different cable arrangement styles and different rise-span ratios are also obtained.
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Pereira, Candida, Jorge Ambrósio, and Amilcar Ramalho. "Application of a Tensioner on a Chain Drives Multibody Model." Applied Mechanics and Materials 394 (September 2013): 140–43. http://dx.doi.org/10.4028/www.scientific.net/amm.394.140.

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The dynamics of chain drives is a complex issue due to the polygonal effect and the multiple successive impacts that take place. The combined effect of these phenomena leads to discontinuities in the systems velocities giving rise to transversal and longitudinal vibrations on the chain spans. To investigate the pretension effect on the drive dynamics, a tensioner is applied to a generalized chain drives multibody model developed and implemented in a computational code by the authors. In this model, the clearance revolute joints formulation is used to handle the dry contact between all drive components. The pretension changes the characteristics of the contact pairs by enforcing a continuous contact with only a small number of contact losses. When no pretension is used, the contact is characterized by a sequence of short duration contacts. The strands of the pretensioned chain vibrate with higher frequency but smaller amplitude in comparison to the non-pretensioned system.
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Kamarudin, K. A., and Al Emran Ismail. "Modelling High Velocity Impact on Aluminium Alloy 7075-T6 under Axial Pretension." Applied Mechanics and Materials 629 (October 2014): 498–502. http://dx.doi.org/10.4028/www.scientific.net/amm.629.498.

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This paper explains the utilisation of finite element model to analyse the ballistic limit of aluminium alloy 7075-T6 impacted by 8.33 g with 12.5 mm radius rigid spherical projectiles. This numerical study was compared with the results obtained experimentally. During impact, the targets were subjected to either non- or uniaxial- pretension and the projectile travelled horizontally to the target. It was observed that pretensioned targets were more vulnerable, which reduced the ballistic limit. The existence of harmful failures owing to pretension impact was ascertained and compared with the non-pretension targets.
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Zabon, Anwar H., and Aseel H. Abed. "Effect of Pre-Tension on the Springback Behavior of the Yellow Brass." Engineering and Technology Journal 38, no. 4A (April 25, 2020): 552–60. http://dx.doi.org/10.30684/etj.v38i4a.96.

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Springback forecasting of sheet formation is constantly remarkable problem in the métier, due to their influence the great in the definitive shape of the product. Study presents effects of pretension in tow rolling direction (0, 45 degree) on the springback behavior of the (Brass 65-35) sheet under V-die bending by an experimental. The pretension ranges from five different pretensions levels starting from 11% to 55% from total strain in each rolling direction by increment of 11%. used in punching that was performed at a constant deformation velocity of (5 mm/min) then bent on a 90° V-shaped die for the springback evaluation. The results from experiment indicate that the springback increase with pretension ratio and the springback in 45 degree is higher in rolling direction.
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McAllister, David R., Keith L. Markolf, Daniel A. Oakes, Charles R. Young, and Justin McWilliams. "A Biomechanical Comparison of Tibial Inlay and Tibial Tunnel Posterior Cruciate Ligament Reconstruction Techniques." American Journal of Sports Medicine 30, no. 3 (May 2002): 312–17. http://dx.doi.org/10.1177/03635465020300030201.

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Background Most posterior cruciate ligament reconstruction techniques use a tibial bone tunnel, which results in an acute bend in the graft as it passes over the posterior portion of the tibial plateau. Hypothesis The tibial inlay technique will result in lower graft pretensions, less laxity, and less stretch-out after cyclic loading. Study Design Controlled laboratory study. Methods Graft pretensions necessary to restore normal laxity at 90° of knee flexion (laxity match pretension) and anteroposterior laxities at five knee flexion angles were recorded in 12 fresh-frozen knee specimens with bone-patellar tendon-bone posterior cruciate ligament graft reconstructions using both techniques and two femoral tunnel positions. Results When the graft was placed in a central femoral tunnel, the tibial tunnel reconstruction required an average 15.6 N greater laxity match pretension than the tibial inlay reconstruction. There were no significant differences in mean knee laxities between the tibial tunnel and tibial inlay techniques at any knee flexion angle; both reconstruction techniques restored mean knee laxity to within 1.6 mm of intact knee values over the entire flexion range. Conclusions There was no important advantage of one technique over the other with respect to the biomechanical parameters measured.
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Zhanjin, Sun, and Zhang Qilin. "A Study on Pre-Tension Measurement of Membrane Structures." International Journal of Space Structures 20, no. 2 (June 2005): 71–82. http://dx.doi.org/10.1260/0266351054764236.

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Compared with the wide application of the membrane structures, the pretension measuring techniques for membrane structures have developed far more slowly. Further studies to search for a high-precision pretension measuring method which is reliable in theory and convenient for operation are not only necessary but also urgent. With the help of the finite element method, two important characteristics, the principles of “Stress Superposition” and “Stiffening Effect of Stress”, are discovered and summarized in this article. The characteristics relate to the relationships between the pretensions of a stretched rectangular membrane with fixed boundaries around, the out-plane displacements at the central point of the membrane and the normal uniform loads applied on the membrane. Based on these two characteristics, a new method to measure the pretensions of membrane structures is proposed, which is called “Numerical Measurement” in this paper. In the final part of the paper, a series of experiments are reported to validate the correctness of the method. The comparisons between the results of the method and those of the experiments are carefully made, which show that the two groups of results agree with each other very well. The results of numerical simulations and experiments prove that our method is a reliable method, and the measuring results are of high precision.
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Huang, Juan, Dana Křemenáková, and Jiří Militký. "Flex Fatigue Behavior Of Plastic Optical Fibers With Low Bending Cycles." Autex Research Journal 15, no. 2 (June 1, 2015): 112–15. http://dx.doi.org/10.2478/aut-2014-0042.

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Abstract Flex fatigue behaviour of plastic optical fibres (POFs) with the diameters of 0.2 and 0.3 mm under different pretensions is measured with fatigue life curve by flexometer. The fatigue sensitivity coefficient is calculated by the linear fitting curve of normalised stress versus logarithm of bending cycles. The residual modulus is investigated during the flex fatigue processes. The results exhibit the exponential relationship between applied pretension and numbers of bending cycles at break. It is indicated that the flex fatigue of POFs might be sensitive with high swing angle or swing speed. There is an evident loss of modulus for two POFs with pretensions of 4 and 10% of ultimate tensile strength during 10-times bending cycles. The values of residual modulus of two POFs almost keep constant after 10-times bending cycles.
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Wang, Hua Jie, Feng Fan, Hong Liang Qian, Xu Dong Zhi, and En Chun Zhu. "Full-Process Analysis of Pretensioning Construction of Dalian Gym." Advanced Materials Research 163-167 (December 2010): 200–204. http://dx.doi.org/10.4028/www.scientific.net/amr.163-167.200.

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As a inclined mega-grid suspend-dome, the prestressing constructi of Dalian gym is very complex. Full-process analysis for the pretensioning scheme should be done before construction. Compared with other pretension methods, a relatively proper scheme of stretching radial cable is put forward and analyzed using construction full-process simulation. The length of active cables without stress is controlled by changing temperature, so pretension is put on cables; Cable tension and removing of temporary support system are simulated using birth and death technology, therefore the structure response of different construction stage and in which stage removing temporary supports is proper are acquired, which provide referenced data for controlling construction safety and precision.
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Alfaro, Luis. "El problema del abandono de las pretensiones imprescriptibles The abandonment issue of the imprescriptible pretensions." Derecho PUCP, no. 78 (2017): 115–28. http://dx.doi.org/10.18800/derechopucp.201701.005.

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Dissertations / Theses on the topic "Pretensioni"

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Guarino, Rocco. "Progettazione preliminare di un ponte ad arco a via inferiore ed approfondimento delle operazioni di tesatura dei cavi di sospensione." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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La tesi si propone di analizzare il comportamento statico del Ponte caso studio ricavando le sollecitazioni di massima agenti sugli elementi principali mediante l’utilizzo di schemi di calcolo semplici. A tale scopo si approfondisce la trattazione analitica dei sistemi collaboranti arco – trave: la trasmissione del carico dall’impalcato all’arco è affidata alla cortina di sospensione che crea una collaborazione tra i due elementi principali. Ai fini del dimensionamento di massima risulta fondamentale capire in che modo vengano assorbiti i carichi permanenti, senza trascurare l’effetto legato alle azioni variabili da traffico. Sulla base di tali considerazioni si ricerca una spiegazione della concezione strutturale dell’opera tenendo in conto degli aspetti legati alla stabilità degli archi, significativi per questo tipo di struttura. Una delle operazioni più delicate del progetto analizzato, oltre alla fase di varo della struttura, è rappresentata dalla pretesatura dei cavi di sospensione. Tale operazione comporta l’applicazione di singole forze concentrate sull’arco che possono avere notevole entità: si realizzano delle condizioni tali per cui possono insorgere nell’arco delle sollecitazioni flessionali significative, tali da condizionarne la progettazione, nel caso in cui si intenda operare una pretesatura per fasi. E’ proprio su questo aspetto che si basa la seguente tesi, presentando una procedura per la determinazione dei valori esatti di pretensione dei cavi che risulti in grado di tenere in conto dell’effettiva sequenza di installazione dei cavi stessi, senza necessariamente ipotizzare la pretensione simultanea. In quest’ottica l’analisi evolutiva della struttura, che consente l’inserimento di elementi e carichi in conformità con quanto previsto a progetto, si è rivelata un ottimo strumento, tale da permettere il controllo dei risultati ottenuti e valutare l’effettiva possibilità di pretesatura per fasi.
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Apolín, Meza Dante Ludwig. "The implicit Res Judicata and the Right of Defense." IUS ET VERITAS, 2016. http://repositorio.pucp.edu.pe/index/handle/123456789/122594.

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This article presents the analysis of the concept of the “implicit res judicata” and what problems it generates. To do this, the author analyzes what is traditionally understood by “objective limits” of “res judicata” and, from this; the true scope of the concept of “res judicata” implicitly will be established.
Este artículo plantea el análisis del concepto de cosa juzgada implícita y los problemas que genera. Para ello, se analiza lo que tradicionalmente se ha entendido por límites objetivos de la cosa juzgada y, a partir de ello, se establecerá el verdadero alcance del concepto de cosa juzgada implícita.
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Alfaro, Luis. "The abandonment issue of the imprescriptible pretensions." Pontificia Universidad Católica del Perú, 2017. http://repositorio.pucp.edu.pe/index/handle/123456789/115806.

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In this article, the issue around abandonment in judicial proceedings (Procedural abandonment) related with the imprescriptible pretensions will be analyzed, with a special mention to those relative to the right to property. The issue discussed in the National Jurisdictional Plenary of Civil Law and Civil Procedure of 2016 will be criticized. The true issue to be solved is revealed, it’s the one related to the imprescriptible pretensions as case of inappropriateness of abandonment. It raises reasons that put in question the normative provision that links the procedural abandonment with those pretensions. Precisely because of the lack of strong arguments to justify the relation, a necessary legislative amendment is proposed.
En el presente artículo se analiza el problema del abandono en los procesos judiciales relacionados con las pretensiones imprescriptibles, con una especial mención de aquellas relativas al derecho de propiedad. Se critica la cuestión analizada en el Pleno Jurisdiccional Nacional Civil y Procesal Civil de 2016 sobre el particular. Se pone de manifiesto que la verdadera cuestión a resolverse es la referida a las pretensiones imprescriptibles como supuestos de improcedencia de abandono. Se expone razones que ponen en entredicho la disposición normativa que vincula el abandono procesal con dichas pretensiones. Justamente por la falta de argumentos fuertes que justifiquen tal relación, se propone (delege ferenda) su necesaria enmienda legislativa.
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Pozzolo, Susanna. "Robert Alexy, fundamental rigths, legal speach and practical rationality. ¿A realistic reading?" Derecho & Sociedad, 2017. http://repositorio.pucp.edu.pe/index/handle/123456789/118945.

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This article focuses on the analysis of the literature produced by Robert Alexy, a renowned German jurist, focusing on the concept of fundamental rights, which are, in a constitutional state of law, the ultimate goal of the legal system. Thus, for Alexy the rights of people are not moral, but rather legal. It is in this sense and taking as a starting point the conception of fundamental rights that the author proposes a tentative reading from a moderate realistic perspective of some aspects of the theoretical position of Alexy.
El presente artículo se centra en el análisis de la literatura producida por Robert Alexy, reconocido jurista alemán, centrada en el concepto de los derechos fundamentales los cuales son, en un estado constitucional de derecho, el fin último del ordenamiento jurídico. Así, para Alexy los derechos de las personas no son de tipo moral, sino más bien, jurídico. Es en ese sentido y tomando como premisa de partida la concepción de los derechos fundamentales que la autora propone una lectura tentativa desde una perspectiva realista moderada de algunos aspectos de la posición teórica de Alexy.
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Gutiérrez, Ferreira Pedro Pablo. "Reivindicación, Petición, Pretensión de Herencia." Pontificia Universidad Católica del Perú, 2015. http://repositorio.pucp.edu.pe/index/handle/123456789/115452.

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Hossain, Md Jahangir. "Effects of Pretension in Bolt for a Slewing Bearing." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2014. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-25271.

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This thesis is to check to bolt pretension for high duty bolted joint in the slewing ring. The bolted joint in the slewing ring is of special type the loads acts off axis of the bolt. For this kind of bolted joint, there is no direct theory. Most of them are based on experiments and are empirical. Some is also based on standards and experience. In the recent years, some finite element simulation has been done by some researchers. In this thesis, a finite element model was made using ANSYS WORKBENCH and an analytical formulation was used to find the work load on the bolt and then applied it in the WORKBENCH simulation and the result was satisfactory.The main task included in this thesis is to investigate the effect on the fatigue life of bolt with reduced pretension. This was also done and the result was satisfactory.Another task was to investigate the effect of plastic material behavior if time is allowed. This task was not addressed here due to time limitations.Other software used for this thesis was AUTOCAD INVENTOR. This was used to develop the model and later the model was analyzed in the WORKBENCH.The loads which act on the slewing bearing in this case comes from load history of the crane. A FORTRAN CODE was written using stiffness method to get loads on the ring from load history.Few recommendations for future work with this topics has also been attached at the end.
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Kong, Paul Y. L. "Transfer of prestress by pretensioned wire tendons." Curtin University of Technology, School of Civil Engineering, 1993. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=11324.

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Key words: End zone, prestress transfer, wire tendon, transmission length, pull-in, plain wire, indented wire, concrete strength, size of wire, gradual release, sudden release, shock release, time dependent effects.An empirical investigation into the transfer of prestress force from wire tendons to concrete in the end zones of pretensioned prestressed concrete beams was accomplished in this project. The experimental tests featured 56 small scale prestressed concrete beams.Some of the factors influencing prestress transfer which were considered in the current tests are as follows:(a) type of release - gradual, sudden or shock(b) surface condition of the wire - plain or indented(c) size of the wire(d) concrete compressive strength at the time of transfer(e) time dependent effectsMost of the tests involved gradual release of steel tendons with the prestressing force transferred in approximately ten equal increments. Sudden release in a single step was achieved by allowing the supporting abutments to retract rapidly. Shock release was implemented in some beams by angle grinding the wires. The type of release which gave the best quality of prestress transfer was gradual release. This was followed by sudden and shock releases respectively.There were four types of wires used in the laboratory tests: namely the 5 mm dia. Plain, 5 mm dia. Chevron indented, 7 mm dia. Plain and 7 mm dia. Belgian indented wires. Transmission lengths were determined from strain distributions for these wires. Pull-ins of the wire tendons at the ends of the beams were also measured.There was significant scatter in the experimental data. Different ranges of transmission lengths and pull-ins were obtained for the various types of wires used.Three equations were derived for the 5 mm dia. Plain, 5 mm dia. Chevron and 7 mm dia. Plain wires, which linearly correlated pull-ins to the transmission lengths. ++
These relationships provide a qualitative and quantitative method of indirectly monitoring for the transmission lengths through the measurements of pull-in.Statistical inference tests proved that indented wires were superior in performance compared to plain wires, but the differences were more apparent for the pull-ins than for the transmission lengths.Comparisons on the influence of tendon size substantiated that greater pull-ins occurred for larger wires but the differences were not significant for the transmission lengths.For concrete strength at the time of transfer of less than 32 MPa, the transmission lengths and pull-ins were significantly larger than those for higher strengths. It is recommended that concrete strength at transfer be at least 32 MPa for pretensioned prestressed concrete.Apart from the maturity and strength of concrete, the quality of a mix also influenced the transmission length and there was limited data to suggest that a better grade mix despite having lower strength at a more tender age could outperform a lower grade mix with greater strength released after a longer curing period.Formulae for plain and indented wires were found by dimensional analysis which correlated the transmission length to the diameter of wire tendon and the stress/strength ratio of the prestressed beams.Pull-ins increased significantly over 6 months but the changes in the transmission lengths were small. Normalised longitudinal strain distributions did not indicate that transmission lengths would remain unchanged over time.
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Haji, Arshad Abdul Aziz. "Moment continuity for simply supported pretensioned concrete bridges." Thesis, University of Nottingham, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.267146.

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Sufian, Fuad. "Analysis and design methods for pretensioned cable net structures." Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.317242.

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Apolín, Meza Dante Ludwig. "Apuntes iniciales en torno a la Acumulación de Pretensiones." Derecho & Sociedad, 2017. http://repositorio.pucp.edu.pe/index/handle/123456789/118040.

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Books on the topic "Pretensioni"

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Rinard, Sally. Pretensions. London: W.H. Allen, 1986.

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Pretensions. London: W.H. Allen, 1987.

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Pretensions. New York: St. Martins Press, 1986.

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Rinard, Sally. Pretensions. New York: St. Martin's Press, 1985.

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Pretensions. New York: St. Martin's Press, 1985.

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A boy's pretensions. New York: Simon and Schuster, 1988.

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Cejas, Julio P. Pretensión de lluvia. [San Luis, Argentina]: Gobierno de San Luis, Subsecretaría de Estado de Cultura, 1988.

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Cejas, Julio. Pretensión de lluvia. 2nd ed. San Luis [Argentina]: Fondo Editorial Sanluisẽno, 1996.

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Cejas, Julio. Pretensión de lluvia. [San Luis, Argentina]: Gobierno de San Luis, Subsecretaría de Estado de Cultura, 1988.

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Montávez, Pedro Martínez. Pretensiones occidentales, carencias árabes. Madrid: CantArabia, 2008.

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Book chapters on the topic "Pretensioni"

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Gooch, Jan W. "Pretension." In Encyclopedic Dictionary of Polymers, 587. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9426.

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Castiglione, Caroline. "Extravagant Pretensions." In Accounting for Affection, 174–205. London: Palgrave Macmillan UK, 2015. http://dx.doi.org/10.1057/9781137315724_6.

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Libby, James R. "Pretensioning Equipment and Procedures." In Modern Prestressed Concrete, 642–64. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4615-3918-6_15.

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Tiersky, Ronald. "XI. Alliance Politics and Revolutionary Pretensions." In Communism in Italy and France, edited by Donald L. M. Blackmer and Sidney Tarrow, 420–55. Princeton: Princeton University Press, 2015. http://dx.doi.org/10.1515/9781400867387-015.

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Horny, L., E. Gultova, T. Adamek, R. Zitny, and H. Chlup. "In Situ Longitudinal Pretension in Human Aorta." In IFMBE Proceedings, 430–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23508-5_112.

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Xu, Bin, Xin Zong, Shaorong Yu, Weifeng Li, and Zhigen Fan. "A Viscoelastic Analysis of Rubber Pretension Structures." In Computational Mechanics, 280. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-75999-7_80.

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Mohandoss, Prabha, Sriram K. Kompella, and Radhakrishna G. Pillai. "Bond Performance of Pretensioned Concrete Systems." In Lecture Notes in Civil Engineering, 277–86. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0362-3_22.

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Harris, Wendell V. "The Pretensions of Theory, the Necessity of Pluralism, and Terminological Promiscuity." In Literary Meaning, 132–56. London: Palgrave Macmillan UK, 1996. http://dx.doi.org/10.1007/978-1-349-24412-6_7.

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Guang, Ma, and Feng Deling. "Some aspects on the design and installation of pretension cable bolts." In Rock Bolting, 575–80. London: Routledge, 2021. http://dx.doi.org/10.1201/9780203740507-58.

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Jenny, Daniel P. "Partial Prestressing for Pretensioned Concrete Products in U.S. and Canada." In Partial Prestressing, From Theory to Practice, 329–43. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4438-1_12.

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Conference papers on the topic "Pretensioni"

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Araújo, Jairo B., Joel S. Sales, Antonio C. Fernandes, and Ana C. S. Thurler. "HSE Consequences of FPSO Mooring Lines Pretension Uncertainty in Deep Waters Applications." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-19291.

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Abstract The purpose of FPSO (Floating Production Storage and Offloading) mooring system is to keep the unit operating in site in order to attend the Health, Safety and Environment (HSE) requirements and to meet the production risers design requirements. The pretension specification is a design task and it is a key activity due to its influence on extreme loads and fatigue life for both the mooring lines and risers. It is surprising that the project pretension specifications are not always actually implemented in practice and followed during all the unit life. Some inaccurate methods are used to get the actual pretension and may cause significant errors, and this may cause pretensions values outside design allowable tolerances. A contemporary uncertainty analysis method that uses numerical simulations to estimate the consequences and propagation of the uncertainties in pretensions is applied. A case study is presented for the case of an operating FPSO moored by a spread system, offshore Brazil. A second investigation compares the uncertainty of pretensions measured by means of sensors with the uncertainties that arise from indirect measurements by top angles and as built data for mooring segments and anchor points. The paper finally shows the need of a Mooring Integrity Management (MIM) implementation of at least annual pretension measurements with a robust and higher precision system.
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Thorbole, Chandrashekhar K., Stephen A. Batzer, and David A. Renfroe. "Evaluation of Automotive Roof Strength and Pretensioner Performance on the Occupant Neck Load." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-37744.

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Roof intrusion is a major cause of neck injury to belted occupants during rollover accidents. The correlation of reduced head room with increased injury risk has been demonstrated by the National Highway Traffic Safety Administration (NHTSA) and others such as the Insurance Institute of Highway Safety (IIHS). The current FMVSS 216 standard requires the vehicle roof, when loaded with a platen of prescribed geometry and application vector, to resist 1.5 times the vehicle empty weight before deforming 127mm. This standard was developed to ensure a modest level of safety of the vehicle in rollover. This paper demonstrates the relation between roof intrusions, available head room and belt pretension on occupant neck loads. A validated finite element model of a 2001 Ford Taurus is used to conduct an inverted drop simulation. The vehicle’s roof impacts an ideally rigid surface with 5 deg of roll and 10 deg of pitch. A 95th percentile Hybrid III ATD (Anthropomorphic Test Device) is used to simulate a large occupant. The simulations are conducted both for a production roof and a modified stiffer, stronger roof. The production roof is modified by addition of extra material in the B-pillars and A-pillars to enhance strength. A seatbelt pretensioner is also modeled to demonstrate the effectiveness of belt pretension in attenuating neck loads. This study demonstrates the inadequate performance of the subject production roof in preventing neck injury. The stronger roof in association with the belt pretensioner reduces the magnitude of the neck loads sufficiently to prevent injury. This study indicates that strong, non-deforming roofs along with belt pretension diminishes neck injury.
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C., Heistermann, Heistermann T., and Veljkovic M. "Remaining Pretension Force in Friction Connections." In 4th International Conference on Steel & Composite Structures. Singapore: Research Publishing Services, 2010. http://dx.doi.org/10.3850/978-981-08-6218-3_ss-th014.

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Sterenborg, Joost, Mark Paalvast, Willem van Schoten, Lourens Boot, and Arjen Tjallema. "Model Tests to Assess Wave and Current Loads on Ocean Cleanup’s Conceptual Plastic Capturing Barrier." In ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-61702.

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Lot of plastics enters the ocean every day with negative effects on the environment, economy and health. A large portion of the floating plastics accumulate in so-called gyres, where currents converge. One of the aims of the Ocean Cleanup is to develop technologies to extract plastic pollution from the oceans. The idea is to install a flexible barrier in the ocean that is supposed to concentrate the plastic at the Great Pacific Garbage Patch. The design of the barrier is still in the conceptual phase and the model tests described in this report are conducted to assist in the development of the barrier. The model tests were carried out in MARIN’s Offshore Basin and served two main goals: 1) provide loads and displacements for numerical model calibrations and 2) examine the 3D fluid-structure interactions and the barrier performance for three different design concepts. A 360m prototype length barrier was considered that consists of a floater with a diameter of 1.5m and a screen with a height of 2m. To model larger lengths of the barrier, various pretensions were applied at the ends of the barrier. For the secondary mooring concept the barrier was moored each 60m via the bottom of the screen to a submerged tension line. For the low mooring and high mooring concepts, the model was only moored at both ends of the bottom of the screen or bottom of the floater. In general mooring loads were found to be the largest for the low mooring configuration. For this same configuration the mooring loads increment with increasing current velocity was the largest. Mooring load fluctuations seemed to be not strongly influenced by the amount of applied pretension. Vertical screen orientations, which are expected to be beneficial for the plastic capturing efficiency, were mostly observed for the secondary mooring and high mooring configurations. For the low mooring concept the offsets along the flow direction were the largest and the screen was more tilted. Additional ballast for the high mooring concept promoted a more vertical orientation of the screen with as downside increasing mooring loads. Overtopping or bridging (air gap exists below the barrier) negatively impact the plastic capturing efficiency and are important to consider. Both events are most likely to happen for shorter wave conditions and higher current velocities. The number of occurrences of overtopping and bridging was the lowest for the secondary mooring and the high mooring setup with a low pretension. For increasing pretension the number of overtopping and bridging events increased.
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Yan, Guirong, Scott Jemison, Qiuhua Duan, and Ruoqiang Feng. "Detection of Pretension Loss of Cable-Net Structures." In ASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/smasis2015-8978.

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Due to aesthetic shapes, light weight and flexibility, cable-net structures have been widely used as roofs for venues where many people assemble, such as sports stadiums/arenas and gymnasiums. Failure of this type of structure may endanger the safety of many people. This type of structure consists of a separate grid of structural cables supporting a nonstructural weather shield. It is well known that the stiffness of this type of structure is established by pretension in the cables. Part of the pretension in the cables will be lost as time evolves. The detection of the pretension loss in cables of cable-stayed bridges has been widely studied. However, the detection of pretension loss in cables of cable-net structures has been lacking. In this study, the dynamic and static properties of cable-net structures will be investigated and the effectiveness of two damage detection approaches in detecting the pretension loss in cable-net structures will be investigated.
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Brasil, Reyolando M. L. R. F., Vicenzo K. Della Monica, and Henrique Braglia Pacheco. "Effect of Pretension on the Dynamic Response of Footbridges." In Footbridge 2017 Berlin. Chair of Conceptual and Structural Design, Fachgebiet Entwerfen und Konstruieren – Massivbau, Technische Universität Berlin, 2017. http://dx.doi.org/10.24904/footbridge2017.09823.

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7

Zheng, Ning, and Hui Li. "Design of control system of pretension tubular rope machine." In 2015 International Conference on Mechanics and Mechatronics (ICMM2015). WORLD SCIENTIFIC, 2015. http://dx.doi.org/10.1142/9789814699143_0110.

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8

Zhao, X. F., J. P. Ou, G. B. Song, and M. Fernandez. "Long Sensing Gauge Fiber Bragg Grating Sensor with Pretension." In 11th Biennial ASCE Aerospace Division International Conference on Engineering, Science, Construction, and Operations in Challenging Environments. Reston, VA: American Society of Civil Engineers, 2008. http://dx.doi.org/10.1061/40988(323)161.

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Molaei, Amir, Amir Hooshiar Ahmadi, Vahid Karamzadeh, Ebrahim Abedloo, and Javad Dargahi. "Pretensioned Structures as Multi Axis Force Sensors." In 2017 5th RSI International Conference on Robotics and Mechatronics (ICRoM). IEEE, 2017. http://dx.doi.org/10.1109/icrom.2017.8466200.

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Mukkamala, Adinarayana, Partha Chakrabarti, and Subrata K. Chakrabarti. "Sensitivity of Mooring Line Pretension in the Design Cycle for Floating Caissons." In ASME 2004 23rd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/omae2004-51237.

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The new parallel Tacoma Narrows Bridge being constructed by Tacoma Narrows Constructors will be mounted on two towers and these towers in turn will be supported by reinforced concrete caissons referred to as East Caisson (Tacoma side) and West Caisson (Gig Harbor side). Each Caisson is towed to the location and several stages of construction will take place at the actual site. During construction, the floating caissons will be moored in place to hold it against the flood and ebb currents in the Narrows. During the mooring system design, a desired pretension is established for the lines at each draft. However, due to practical limitations in the field some variations to this design pretension value may be expected. It is important to study the effect of this variation on the overall performance of the mooring system. In this paper, the sensitivity of the mooring line pretension on the overall performance of the mooring system for the above caisson is presented. During this study, all the variables that affect the mooring system design such as mooring system layout, mooring line makeup, anchor positions, fairlead departure angles, and fairlead locations are kept constant. The only variable changed is the pretension of the mooring lines. Two approaches for defining the variations in the pretension have been studied in this paper. In the first approach, the pretension is changed in a systematic way (predicted approach). In the second method the pretension is changed randomly. The latter is considered more likely to occur in the field for this type of complex mooring system. Both sets of results are presented for some selected drafts attained by the caisson during its construction. The difference in the results from the two methods is discussed.
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Reports on the topic "Pretensioni"

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Abdalla, O., J. Ramirez, and Robert Lee. Debonding in Pretensioned Beams-Precast Strands, Part 2: Simply Supported Tests. West Lafayette, IN: Purdue University, 1993. http://dx.doi.org/10.5703/1288284314207.

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Peterman, Robert, J. Ramirez, and J. Olek. Evaluation of Strand Transfer and Development Lengths in Pretensioned Girders with Semi-Lightweight Concrete. West Lafayette, IN: Purdue University, 1999. http://dx.doi.org/10.5703/1288284313215.

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Abdalla, O., J. Ramirez, and Robert Lee. Strand Debonding in Pretensioned Beams - Precast Prestressed Concrete Bridge Girders with Debonded Strands - Continuity Issues. West Lafayette, IN: Purdue University, 1993. http://dx.doi.org/10.5703/1288284314206.

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4

Implementation of Ultra-HighPerformance Concrete in Long-Span Precast Pretensioned Elements for Concrete Buildings and Bridges. Precast/Prestressed Concrete Institute, 2020. http://dx.doi.org/10.15554/pci.rr.mat-012.

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