钢筋混凝土框架－自复位约束砌体墙结构力学及抗震性能研究

The self-centering structure can survive strong earthquake with little or no rehabilitation. This type of structure has attracted more and more attentions in the earthquake engineering community. Combining the new type of self-centering confined masonry wall developed earlier by our research team with the reinforced concrete frame structure, a self-centering structural system termed as RCF-SCMW (reinforced concrete framed self-centering confined masonry wall) structure is proposed. By way of theoretical analysis, experimental study and numerical simulation, its mechanical behavior and seismic performance are to be investigated thoroughly. The studies involved in this proposal mainly concern: 1) establishing the theoretical analysis models for the RCF-SCMW structure pertaining to the specific problem; 2) deriving the basic solving equations for the RCF-SCMW structure subjected to the lateral load and investigating its static performance; 3) establishing the motion equations for the RCF-SCMW structure subjected to earthquake excitation and studying its dynamic performance; 4) investigating subsequently the seismic performance of the RCF-SCMW structure by way of pseudo-static test after understanding its mechanical behavior; 5) setting up the numerical analysis model for the RCF-SCMW structure based on the outcomes obtained from theoretical analysis and experimental study and analyzing the influence of different parameters on its seismic performance.

自复位结构在震后无需或经少量修复即可恢复正常使用，这种新型结构在地震工程界越来越受到重视。在本课题组研制的自复位约束砌体墙的基础上，本项目将其与钢筋混凝土框架结构组合，提出一种具有自复位性能的钢筋混凝土框架－自复位约束砌体墙结构，并分别采用理论分析、试验研究和数值模拟的手段，探究其力学机理及抗震性能。本项目的主要研究内容包括：根据分析问题的不同，建立相应的钢筋混凝土框架－自复位约束砌体墙结构理论分析模型；建立水平荷载作用下钢筋混凝土框架－自复位约束砌体墙结构的基本方程，研究其静力性能；建立地震作用下钢筋混凝土框架－自复位约束砌体墙结构的运动方程，研究其动力性能；在探明力学机理的前提下，进一步通过拟静力试验研究钢筋混凝土框架－自复位约束砌体墙结构的抗震性能；基于理论分析与试验研究的结果，建立钢筋混凝土框架－自复位约束砌体墙结构的数值分析模型，并分析不同参数对其抗震性能的影响。

本项目将课题组前期研制的自复位约束砌体墙与钢筋混凝土框架结构结合，提出一种具有自复位性能的钢筋混凝土框架－自复位约束砌体墙结构，并分别采用理论分析、试验研究和数值模拟的手段，探究其受力机理及抗震性能。本项目的主要研究内容及成果如下：针对框架－自复位墙结构，将自复位墙处理成刚体，框架结构分别采用多质点体系和单质点体系模拟，分别得到了“刚体－多质点”及“刚体－单质点”分析模型；采用“刚体－多质点”模型，建立了三种典型水平荷载作用下的基本方程，给出了位移与内力的解析表达式；采用“刚体－单质点”模型，通过理论推导，研究了框架－自复位墙结构在水平往复荷载作用下的滞回性能；采用“刚体－单质点”模型及“刚体－多质点”模型，推导了框架－自复位墙结构在地面激励下的运动方程，提出了动力反应的求解方法，深入研究了其动力性能；采用拟静力试验，研究了钢筋混凝土框架－自复位约束砌体墙结构的抗震性能，基于试验结果建立了有限元数值分析模型。自复位抗震结构目前在我国的研究和应用还较少，本项目的研究能为框架－自复位墙结构在我国实际工程中的应用提供理论依据和重要参考。