内嵌填充墙体框架结构抗震性能分析及抗侧刚度公式

SEISMIC PERFORMANCE ANALYSIS AND LATERAL STIFFNESS OF INFILLED FRAME STRUCTURE

结构初始刚度是工程抗震设计中的重要参数,在内嵌蒸压加气混凝土(ALC)板框架结构拟静力试验的基础上,基于试验现象,提出了一种填充墙体-框架结构相互作用模型并推导出结构初始刚度计算公式。建立5组28个有限元模型,研究梁柱线刚度比、墙体高宽比、嵌缝材料弹性模量、墙体弹性模量和厚度对填充墙体刚度贡献的影响。研究发现:填充墙体的刚度贡献主要受局部压缩的影响,其贡献程度与墙体-框架抗侧刚度之比呈负相关。基于此,通过拟合得到了墙体刚度折减系数a_(w)关系式,通过与试验结果的对比,结果表明:该文提出的内嵌填充墙体框架初始刚度计算公式结果准确,可以为工程实践提供参考。

The initial stiffness of structures is an important parameter in engineering seismic design.Based on the quasi-static test of a frame structure which has embedded ALC slab,a mechanical model for infill frame structures is proposed and a formula for calculating the initial stiffness of structures is deduced according to the experimental phenomenon.In addition,five groups of 28 finite element models were established to study the effects of beam-to-column linear stiffness ratio,of the height-to-width ratio of the wall,of the elastic modulus of caulking material,of the elastic modulus and thickness of the wall on the stiffness contribution of filled wall.It is found that:the stiffness contribution of infilled wall is mainly affected by local compression,and its contribution is negatively correlated with the ratio of wall to frame lateral stiffness.On this basis,obtained through fitting was the relationship between the wall stiffness reduction coefficient a_(w)and the wall to frame lateral stiffness ratio.The comparison between the calculated results and the experimental results shows that the calculation formula proposed for calculating the initial stiffness of the infilled frame is reliable;can be applied in practice engineering design.