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首页> 外文期刊>Engineering Structures >Non-linear time history analysis of reinforced concrete coupled shear walls: Comparison of old design, modern design and retrofitted with externally bonded CFRP composites
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Non-linear time history analysis of reinforced concrete coupled shear walls: Comparison of old design, modern design and retrofitted with externally bonded CFRP composites

机译：钢筋混凝土耦合剪力墙的非线性时程分析：旧设计，现代设计和外部粘结CFRP复合材料翻新的比较

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When appropriately designed, coupled shear walls (CSWs) are very effective lateral load resisting systems for medium to high rise buildings. They reduce the deformation demands on the building and distribute the inelastic deformation between the coupling beams (CBs) and the wall piers. Their seismic performance depends mainly on the ability of their CBs to provide adequate stiffness and strength. Therefore, the design of the CBs and the walls at their base is of paramount importance. However, many existing buildings with CSWs feature unsatisfactory behaviour under lateral loading as they were designed and constructed according to old codes and standards with insufficient requirements for seismic design. Their seismic retrofit is therefore inevitable. Many conventional retrofit techniques have been attempted in the past to improve the seismic behavior of CSWs. Recently, an innovative technique using externally bonded fibre reinforced polymer (EB-FRP) composite to strengthen existing reinforced concrete (RC) structural elements has emerged. The current study focuses on two objectives related to CSWs: (i) evaluate the seismic performance of old designed CSWs and highlight their deficiencies by comparing its response with that of corresponding modern design CSWs; and (ii) evaluate the effectiveness of EB-Carbon FRP (EB-CFRP) retrofitting on the seismic response of deficient CSWs. To achieve these objectives, two 20-story CSWs located in Western seismic Canadian zone were considered. One CSW was designed according to old National Building Code of Canada (NBCC) 1941 and the other one designed in conformity with modern NBCC 2015 and Canadian Standard Association (CSA) A23.3-14. The nonlinear time-history analyses of the two types of CSWs as well as the CFRP retrofitted one under simulated earthquake motions are carried out using RUAUMOKO program. The observed results confirmed the effectiveness of CFRP retrofitting in enhancing the seismic performance of deficient old CSWs in terms of story displacement, inter-story drift, CBs' rotation, and walls' curvature.
机译：如果设计合理，则耦合剪力墙（CSW）是用于中高层建筑的非常有效的横向载荷抵抗系统。它们减少了对建筑物的变形要求，并在耦合梁（CB）和墙墩之间分配了非弹性变形。它们的抗震性能主要取决于其CB提供足够的刚度和强度的能力。因此，断路器和底部墙的设计至关重要。但是，许多现有的带有CSW的建筑物在横向荷载下的性能都不令人满意，因为它们是根据旧的规范和标准设计和建造的，对地震设计的要求不足。因此，他们的抗震改造是不可避免的。过去已经尝试了许多常规的改装技术来改善CSW的抗震性能。最近，出现了一种创新技术，该技术使用外部粘结的纤维增强聚合物（EB-FRP）复合材料来增强现有的钢筋混凝土（RC）结构元素。当前的研究集中在与CSW有关的两个目标上：（i）通过比较旧设计的CSW与相应的现代CSW的响应来评估其抗震性能，并突出它们的不足； （ii）评估EB-碳FRP（EB-CFRP）改型对缺乏CSW的地震响应的有效性。为了实现这些目标，考虑了位于加拿大西部地震带中的两个2​​0层高的CSW。一个CSW是根据1941年加拿大国家建筑标准（National Building Code）进行设计的，另一个是根据现代NBCC 2015和加拿大标准协会（CSA）A23.3-14进行设计的。使用RUAUMOKO程序，对两种类型的CSW以及在模拟地震运动下进行的CFRP改造进行了非线性时程分析。观察到的结果证实了CFRP改造在提高层级位移，层间漂移，CB旋转和墙体曲率方面对不足的旧CSW的抗震性能的有效性。

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