人字形中心支撑钢框架静力推覆试验与有限元分析

Research on pushover test of inverted-V concentrically braced steel frame

为研究中心支撑钢框架在水平荷载作用下的抗侧刚度、延性、极限承载力及破坏模式,对一缩尺人字形中心支撑钢框架进行静力推覆试验.并分别采用SAP2000和ANSYS有限元程序对试验进行模拟.结果表明:受压支撑的屈曲会导致结构抗侧刚度的显著降低,但结构的水平承载力并无显著降低;受压支撑屈曲后,结构还具有较好的延性;规范中认为受压支撑杆屈曲后只有30%的承载能力,且据此来验算横梁的做法偏于保守.

A pushover test was carried out on a scaled model of inverted-V concentrically braced steel frame （CBSF）,in order to research the lateral rigidity,ductility,limit bearing capacity and failure mode.Two finite element programs （SAP2000 and ANSYS） were adopted to model the test.The results indicated that the lateral rigidity would decrease markedly after the buckling of the compressive braces,but the horizontal bearing capacity would not reduce obviously,and the structures would still perform good ductility.The codes specify that the compressive braces remain only 30% the bearing capacity after buckling,and a beam designed accordingly.