柔性连接填充墙RC框架结构非线性有限元分析

Nonlinear finite element analysis of masonry⁃infilled RC frame structure with flexible connection

为了研究橡胶作为新型柔性连接材料对填充墙钢筋混凝土(RC)框架结构抗震性能的影响,在7榀1/2缩尺填充墙RC框架结构低周反复加载试验的基础上,采用DIANA有限元软件分析了填充墙与框架之间的连接方式、砌块材料、柔性连接材料以及砂浆强度对填充墙RC框架结构抗震性能的影响。结果表明:与刚性连接相比,以橡胶作为新型柔性连接材料,能减缓结构的强度和刚度退化,极大降低结构的破坏程度,显著提高结构的抗震性能;高弹性橡胶和高阻尼橡胶作为柔性连接材料均表现出优异的抗震性能,而聚苯板(EPS)作为柔性连接材料的抗震性能要比橡胶差;刚性连接方式下不同砌块材料对结构抗震性能影响很大,当使用强度较高的砌块材料时建议采用柔性连接方式以减弱墙-框相互作用;合理降低砂浆的强度等级,可以改变填充墙的破坏模式,对抗震有利。

In order to study the effect of rubber as a new type of flexible connection material on the seismic performance of masonry-infilled RC frame structure,based on low-cycle reversed loading tests of seven 1/2 scale masonry-infilled RC frame structure,DIANA finite element software was used to analyze the influence of the connection mode between the filled wall and the frame,block materials,flexible connection materials and mortar strength on the seismic performance of the masonry-infilled RC frame structure.The results show that,compared to the rigid connection,rubber as the new flexible connection material can slow down the strength and stiffness degradation of the structure,greatly reduce the damage degree of the structure,and significantly improve the seismic performance of the structure.Both high elastic rubber and high damping rubber as flexible connection materials show excellent seismic performance,while expandable polystyrene(EPS)board as flexible connection materials show worse seismic performance than rubber.Different block materials have a great influence on the seismic performance of the structure under the rigid connection mode.It is suggested to adopt flexible connection mode to weaken the wall-frame interaction when the block materials with high strength are used.Reasonably reducing the strength grade of mortar can change the failure mode of the filled wall,which is beneficial to the earthquake resistance.