方支管-H型钢主管T型节点滞回性能研究

Study on hysteretic behavior of T type joints of square pipe-H section steel pipe

T型节点是钢结构中常见的节点形式之一。为研究T型节点的抗震性能,将16个尺寸不同的试件分为四组,其中两组不设加劲板,对照组设加劲板。利用ABAQUS软件进行数值模拟,分析了不设加劲板和设置加劲板的情形下支管宽度与主管翼缘宽度比β、支管厚度与主管翼缘厚度比γ两个参数对节点滞回性能影响,结果表明:无论是否设置加劲板,当轴向荷载取设计中的最小值时,在水平往复荷载作用下,节点滞回曲线均呈饱满梭形,且随着β、γ增大,节点承载能力增大,耗能能力增强;随着轴向荷载增大,无论是否设置加劲板,在水平往复荷载的作用下,各试件承载力均出现降低的迹象,这种现象在β、γ取设计中的最小值时尤为明显;对于设置加劲板的试件,与未设加劲板的试件相比,其承载力提高,抗震性能变好。

T-joint is one of the common joint forms in steel structure.In order to study its seismic performance,16 specimens with different sizes were divided into four groups,two of which were not provided with the stiffening plates,and the control group was equipped with the stiffening plate.Numerical simulation was carried out using ABAQUS software and the influences of two parameters,β,the ratio of branch pipe width to main pipe flange width andγ,the ratio of branch pipe thickness to main pipe flange thickness,on the hysteretic performance of joints,with or without the stiffening plate,were analyzed.The results showed that no matter whether the stiffening plate was set or not,when the axial load took the minimum value in the design,the hysteretic curve of joint was full shuttle shape under the horizontal reciprocating load,and as the two parametersβandγincreased,both the bearing capacity of joint and the energy consumption capacity increased.With the increase of axial load,the bearing capacity of each test piece decreased under the action of horizontal reciprocating load,which was particularly obvious whenβandγwere at the minimum value of the design.For the test piece with the stiffening plate,the bearing capacity was improved and the seismic performance was better than the test piece without the stiffening plate.