框架填充墙等效单杆斜撑简化模型

摘要

在已有的填充墙等效对角斜撑模型的基础上,结合近年来地震现场普遍出现的填充墙顶部与框架梁柱节点接触处的砖砌体在大震作用下通常会被压碎这一实际震害现象,改变等效斜撑杆与框架柱的接触位置,提出一种新的简化计算模型.通过理论推导给出等效斜撑墙片宽度的计算公式,利用ABAQUS有限元模拟的方法,确定等效斜撑墙片与框架柱合理接触位置的经验计算公式.最后通过将简化有限元模型计算结果与试验结果进行对比,验证该简化建模方法的正确性.研究结果表明:传统的对角斜撑模型低估框架填充墙构件的水平承载力,新模型与芦山地震框架结构震害结果更相符.本模型可为框架结构抗震分析与设计验算提供参考意义.%Based on the existing equivalent diagonal strut model, combined with the actual earthquake damage phenomena that the brick masonry between the top of the infill wall and the beam-column connections is often crushed during a strong earthquake, and changing the contact position between the equivalent bracing wall and column, a new calculation model was generated. Through theoretical derivation, the formulae for calculating the contact length between the equivalent bracing wall and column was given. Using the ABAQUS finite element simulation, an empirical formula for the reasonable contact position between the equivalent bracing wall and column was determined. Finally through comparing the finite element model calculation results with the experimental result, the validity of the simplified modeling method was verified. The results show that the traditional diagonal strut model underestimates the horizontal bearing capacity of the infill-frame, and the new model is more consistent with the seismic damage of frame structure in Lushan earthquake. The model has reference significance to seismic analysis of frame structure.