【摘要】：根據(jù)GSA2003提出的備用荷載路徑法,采用非線性動(dòng)力分析方法對(duì)12層鋼管混凝土空間框架當(dāng)關(guān)鍵柱失效后,其剩余結(jié)構(gòu)的抗連續(xù)倒塌機(jī)制進(jìn)行分析�；谟脩�(hù)自定義材料開(kāi)發(fā)平臺(tái)(UMAT),進(jìn)行了鋼材和混凝土單軸本構(gòu)滯回模型的二次開(kāi)發(fā),并與已有試驗(yàn)結(jié)果進(jìn)行了對(duì)比驗(yàn)證。研究結(jié)果表明:關(guān)鍵柱失效后,失去支撐的框架梁在小變形范圍內(nèi)主要通過(guò)梁受彎承載力提供抗倒塌能力;在大變形范圍內(nèi),失去支撐并貫通節(jié)點(diǎn)的框架梁,通過(guò)其受拉承載力提供抗連續(xù)倒塌能力。根據(jù)失效柱位置的不同,抗連續(xù)倒塌機(jī)制也不相同,角柱失效后,X/Y方向的框架邊梁均為梁機(jī)制作為主要抗力來(lái)提供抗連續(xù)倒塌的能力,未出現(xiàn)懸鏈線效應(yīng)。
[Abstract]:According to the standby load path method proposed by GSA2003, the nonlinear dynamic analysis method is used to analyze the anti-continuous collapse mechanism of the remaining structures of 12-story concrete-filled steel tubular spatial frames when the key columns fail. Based on the user-defined material development platform (UMAT), the secondary development of uniaxial constitutive hysteretic model of steel and concrete is carried out, and the results are compared with the existing test results. The results show that after the failure of the key column, the frame beam with lost support mainly provides anti-collapse ability through the bending bearing capacity of the beam in the small deformation range, and in the large deformation range, the frame beam that loses support and passes through the joint provides the ability to resist continuous collapse through its tensile bearing capacity. According to the position of the failed column, the mechanism of resistance to continuous collapse is also different. After the failure of the angular column, the frame side beam in the direction of X 鈮，

本文編號(hào)：2500526