【摘要】 带填充墙历史建筑钢框架的低周反复加载试验表明,钢柱外包砖、填充墙能显著提高框架抗震承载能力和抗侧刚度。在此基础上,采用ABAQUS软件建立单层单跨带填充墙钢框架三维实体模型,进一步分析其在水平荷载作用下的受力性能,数值模拟结果与试验结果较吻合。有限元分析发现,钢框架达到承载能力极限状态时钢柱及其外包砌体、填充墙的贡献近似等于各自的极限承载能力。参数分析结果表明,填充墙宽度增大,墙体承载力贡献提高,但其抗剪强度下降,不能简单地根据抗剪面积计算填充墙承载力贡献。此外,随着填充墙厚度的增加和砂浆强度的提高,填充墙的承载力贡献增加。将该类历史建筑中填充墙框架看作带斜撑钢框架,假定钢柱与外包砌体协同工作,建立了抗剪承载力的简化计算公式。更多还原

【Abstract】 Low-cyclic lateral loading tests on masonry-infilled historic steel frames show that covered masonry around the columns and the infilled wall can significantly increase the loading capacity and lateral stiffness of the steel frames.For further investigation on structural performance of infilled steel frames under lateral loading,the three-dimensional models of single-layer and single-span steel frame structures with infilled masonry walls were established in ABAQUS for finite element analysis.Numerical simulation results agree well with the experimental results.Results of the finite element analysis indicate that the contribution of infilled wall,steel columns and their covered masonry can approximately equal their respective ultimate lateral loading capacity when the infilled steel frame reaches the ultimate loading capacity.Parametric analysis results show that a greater ultimate loading capacity is found as expected in the steel frame with a wider infilled wall,but the average shear strength of the infilled wall decreases as the width of the infilled wall increases.It can be deduced that the contribution of the infilled wall to the lateral loading capacity cannot be simply estimated by its shear area.With the increase of thickness and mortar strength of the infilled wall,the contribution of the infilled wall to the lateral loading capacity increases.Assuming that steel columns can work well with covered masonry as integral composite columns,this kind of historic building with infilled wall frame was considered as an equivalent diagonal strut,and a simplified method was proposed to calculate the shear capacity of the structure.更多还原