双钢板-混凝土组合墙局部屈曲性能试验

进行了4片双钢板-混凝土组合墙轴向受压试验,分析钢板强度和距厚比(抗剪连接件间距与钢板厚度比值)对外钢板局部屈曲位置、临界荷载、破坏类型的影响规律。结果表明:在竖向的2个连接件和4个连接件中部位置的钢板容易发生屈曲,且钢材强度越高,防止试件发生屈曲先于屈服局部弹性屈曲破坏的距厚比限值越小;距厚比仅对构件的破坏类型、局部屈曲的临界荷载影响较大。在试验研究基础上,采用理论分析,推导了防止钢板发生局部弹性屈曲破坏的距厚比限值公式,并采用国内外试验研究数据和数值模拟分析方法对公式的适用性进行验证,进一步修正了防止双钢板-混凝土组合墙发生局部弹性屈曲破坏的距厚比限值设计公式。

Experimental study on local buckling behavior of composite walls with double steel plates and filled concrete

Four composite walls with double steel plates and filled concrete were tested under axial compressive loads, and the effects of the strength and distance-to-thickness ratio(the ratio of the distance between shear connectors to the steel plate thickness)of a steel plate on the local buckling position, critical loading, and failure modes were analyzed. Test results indicate that local buckling tends to occur in the middle between two vertical connectors and in the middle part of the area surrounded by four connectors. The limit value of the distance-to-thickness ratio that prevents local buckling failure from occurring before yielding failure decreases with the increase of the strength of steel. The distance-to-thickness ratio has a significant influence on the failure mode and critical load of local buckling. Based on the analysis of experiments, the formula for the limit value of the distance-to-thickness ratio that prevents local elastic buckling failure was derived. The applicability of the formula was verified by the existing experimental data and numerical analysis, and the formula was further modified.