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Determination of the seismic performance factors for post-tensioned rocking timber wall systems

机译：后张紧式摇摆木墙系统抗震性能因子的确定

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摘要

Post-tensioned technologies for concrete seismic resistant buildings were first developed in the 1990s during the PREcast Seismic Structural Systems program. Among different solutions, the hybrid system proved to be the most resilient solution providing a combination of re-centering and energy dissipative contributions respectively by using post-tensioned tendons and mild steel reinforcement. The system, while providing significant strength and energy dissipation, reduces structural element damage and limits post-earthquake residual displacements. More recently, the technology was extended to laminated veneer lumber (LVL) structural members, and extensive experimental and numerical work was carried out and allowed the development of reliable analytical and numerical models as well as design guidelines. On the basis of the experimental and numerical outcomes, this paper presents the evaluation of the seismic performance factors for post-tensioned rocking LVL walls using the FEMA P-695 procedure. Several archetype buildings were designed considering different parameters such as the building and story height, the type of seismic resistant system, the magnitude of gravity loads and the seismic design category. Lumped plasticity models were developed for each index archetype to simulate the behavioral aspects and collapse mechanisms. Non-linear quasi-static analyses were carried out to evaluate the system over-strength factor; moreover, non-linear time history analyses were performed using the incremental dynamic analysis concept to assess the collapse of each building. From the results of quasi-static and dynamic analyses the response modification factor, R, system over-strength factor, (0), and deflection amplification factor, C-d, values of, respectively, 7, 3.5 and 7.5 are recommended. Copyright (c) 2016 John Wiley & Sons, Ltd.
机译：混凝土抗震建筑物的后张技术最早是在1990年代“预制抗震结构系统”计划期间开发的。在不同的解决方案中，混合动力系统被证明是最具弹性的解决方案，通过使用后张预应力筋和软钢加固，分别提供了重新定心和耗能的组合。该系统在提供强大的强度和能量耗散的同时，减少了结构元件的损坏并限制了地震后的残余位移。最近，该技术已扩展到层压单板木材（LVL）结构构件，并且进行了广泛的实验和数值工作，并允许开发可靠的分析和数值模型以及设计准则。在实验和数值结果的基础上，本文介绍了使用FEMA P-695程序评估后张拉摇摆式LVL墙的抗震性能因素。设计了几座原型建筑，并考虑了不同的参数，例如建筑物和楼层的高度，抗震系统的类型，重力荷载的大小以及抗震设计类别。针对每种索引原型开发了集总可塑性模型，以模拟行为方面和崩溃机制。进行了非线性准静态分析，以评估系统的超强度因素。此外，使用增量动态分析概念进行了非线性时程分析，以评估每座建筑物的倒塌。根据准静态和动态分析的结果，建议分别将响应修正因子R，系统超强度因子（0）和偏转放大因子C-d的值分别设置为7、3.5和7.5。版权所有（c）2016 John Wiley＆Sons，Ltd.

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