【摘要】 通过模拟地震振动台试验和非线性有限元分析,对一种自建典型民居(无构造柱退层式砖砌体结构)的抗震性能进行研究。结果表明:1此类结构能够承受峰值加速度为0.2g的地震作用;当峰值加速度达到并超过0.3g时,结构严重破坏,甚至倒塌;2结构第1层纵墙退层处的墙体以及第3层楼梯间和窗间墙破坏最为严重,为结构的薄弱部位,应考虑加固;3砌体结构的有限元模拟可采用整体连续模型。计算中通过定义材料的塑性应力-应变关系和损伤因子来模拟构件的非线性,从而实现模型的非线性分析,与试验结果的对比表明该方法的有效性。研究的结构形式在我国村镇广泛存在,因此研究成果适用于不同地区同等结构形式的自建民居抗震性能评价与加固改造。更多还原

【Abstract】 Based on shaking table test and nonlinear finite element analysis, the dynamic performance of a typical s elf-built dwelling model, brick masonry building without structural column, were studied. The results showed that:1 The typical rural house is able to withstand earthquake action corresponding to peak acceleration 0.2g, but when the peak acceleration is more than 0.3g, the structure will be seriously damaged or even collapse. 2 Two parts of the dwelling are severely damaged, one is the wall with the change of vertical stiffness in the first floor, and the other is the wall of the stairwell and windows in the third floor. They can be regarded as weaknesses of the structure,and reinforcement programs should focus on two parts. 3 The finite element analysis of the masonry structure was implemented by using the continuum model, in which the mechanical properties of brick masonry was approximately simulated by the plastic damage model, and the nonlinear analysis of model was carried out by defining plastic stress-strain relations and damage factor of concrete. And the results of the finite element simulation are consistent with that of test. Because the dwelling studied in this paper is also widely exist in towns of China, the results can also be applied to estimat e the dynamic performance and provide strengthen layout for the same structure in the different regions.更多还原