钢板-砖砌体组合短柱轴心受压性能试验研究与理论分析

为了研究钢板-砖砌体组合柱中对拉螺栓间距、钢板厚度与结构胶侧向黏结力对钢板局部屈曲的影响，对6个钢板-砖砌体组合短柱试件进行轴心受压试验。结果表明，随着钢板厚度的增加、螺栓间距与钢板厚度之比的减小，钢板局部屈曲变形程度相对降低；可见屈曲荷载与极限荷载的比值为70%~85%左右；在有结构胶侧向黏结力作用下，钢板的局部屈曲发展受到一定程度的约束，使得采用应变片读数判断的钢板局部屈曲临界点与钢板发生可见屈曲变形时对应的荷载值可能存在差异。基于试验数据，通过拟合分析得到钢板发生可见屈曲变形时的钢板应力计算模型，提出轴心受压钢板-砖砌体组合柱钢板发生可见屈曲变形时的承载力计算式。通过与试验结果的对比可知，提出的计算方法可以用于指导类似构件的设计。

Experimental investigation and analysis of behavior of steel plate-masonry composite stub columnunder axial compression

In order to investigate the influences of the spacing of binding bolts, the thickness of steel plate and the lateral bonding stress of epoxy adhesive on the local buckling of steel plate in steel plate-masonry composite columns, six steel plate-masonry composite stub columns were tested under axial compression. Research results show that the extent of steel plate deformation due to local buckling decreases with the increase in steel plate thickness and reduction in ratio of bolt spacing to steel plate thickness; the ratio of the load-carrying capacity of specimen corresponding to visible buckling deformation to that in the ultimate state is about 70% to 85%; in view of the contribution of lateral bonding stress of epoxy adhesive, the occurrence of the local buckling of steel plate is restrained to some extent, which results in that the applied load corresponding to the critical local buckling of steel plate determined by strain gauges measurement is probably different from that by visible local buckling deformation. Based on the experimental data, the calculating model of steel plate stress corresponding to visible buckling deformation in the steel plate was obtained through fitting analysis, and then the calculating formula, for load-carrying capacity of steel plate-masonry composite column when visible buckling deformation occurs, was proposed. After the comparison between theoretical calculation and test results, the calculating method presented in this paper has good accuracy, which can be used for the design of similar structural elements.