ABSTRACT

Soil–structure interaction (SSI) effects on the dynamic response of reinforced concrete (RC) wall-frame dual system have not adequately been investigated and are usually not considered in the engineering practice. In this study, the seismic behavior of the RC wall-frame dual system is studied in detail. The main goal of this research is to obtain the base shear contribution ratios of the dual system components including shear wall and moment-resisting frame with and without considering SSI effects. For this purpose, three 5-, 10- and 15-story structures are modeled and analyzed in OpenSees platform. For each model of the structures, pushover analysis, and 22 nonlinear dynamic time-history analyses assuming 11 ground motion records and 2 levels of PGA = 0.4 g and 0.7 g are performed once by considering SSI effects and once without it. For more accuracy, the shear–flexure interaction (SFI) model is used to imitate the actual behavior of the RC shear wall. The beam on the nonlinear Winkler foundation (BNWF) method is utilized for modeling SSI effects. The results indicate that considering SSI effects leads to an increase in the fundamental periods of all models and the base shear contribution ratios of the moment frame, whereas it leads to a decrease in the base shear contribution ratios of the shear wall. On the other hand, the SSI effects increase the inter-story drifts in all models. However, when the structures subjected to ground motion, records with PGA = 0.4 g and 0.7 g meet the life safety and the collapse prevention performance levels, respectively.

摘要

土-结构相互作用（SSI）对钢筋混凝土（RC）墙-框架双系统动力响应的影响尚未得到充分研究，工程实践中通常没有考虑。在这项研究中，详细研究了钢筋混凝土墙框架双系统的抗震性能。本研究的主要目的是在不考虑SSI效应的情况下，获得包括剪力墙和抗弯框架在内的双系统构件的基本剪力贡献比。为此，在OpenSees平台中对三个5层，10层和15层的结构进行了建模和分析。对于每个结构模型，假设考虑11个地面运动记录和2个水平的PGA = 0.4 g和0.7 g，则进行一次推覆分析和22次非线性动态时程分析，其中一次考虑SSI效应，一次不考虑SSI效应。为了获得更高的精度，使用了剪—挠相互作用（SFI）模型来模拟RC剪力墙的实际行为。利用非线性Winkler基础（BNWF）方法上的梁对SSI效果进行建模。结果表明，考虑SSI效应会导致所有模型的基本周期和弯矩框架的基础剪力比的增加，而导致剪力墙的基础剪力比的减小。另一方面，SSI效应会增加所有模型中的层间漂移。但是，当结构经受地震动时，PGA = 0.4 g和0.7 g的记录分别满足生命安全和防塌性能等级。利用非线性Winkler基础（BNWF）方法上的梁对SSI效果进行建模。结果表明，考虑SSI效应会导致所有模型的基本周期和弯矩框架的基础剪力比的增加，而导致剪力墙的基础剪力比的减小。另一方面，SSI效应会增加所有模型中的层间漂移。但是，当结构经受地震动时，PGA = 0.4 g和0.7 g的记录分别满足生命安全和防塌性能等级。利用非线性Winkler基础（BNWF）方法上的梁对SSI效果进行建模。结果表明，考虑SSI效应会导致所有模型的基本周期和弯矩框架的基础剪力比的增加，而导致剪力墙的基础剪力比的减小。另一方面，SSI效应会增加所有模型中的层间漂移。但是，当结构经受地震动时，PGA = 0.4 g和0.7 g的记录分别满足生命安全和防塌性能等级。结果表明，考虑SSI效应会导致所有模型的基本周期和弯矩框架的基础剪力比的增加，而导致剪力墙的基础剪力比的减小。另一方面，SSI效应会增加所有模型中的层间漂移。但是，当结构经受地震动时，PGA = 0.4 g和0.7 g的记录分别满足生命安全和防塌性能等级。结果表明，考虑SSI效应会导致所有模型的基本周期和弯矩框架的基础剪力比的增加，而导致剪力墙的基础剪力比的减小。另一方面，SSI效应会增加所有模型中的层间漂移。但是，当结构经受地震动时，PGA = 0.4 g和0.7 g的记录分别达到了生命安全和防塌性能等级。