基于承载力预压装配式框架结构的鲁棒性

结构鲁棒性是指建筑结构承受局部损伤和防止结构发生连续倒塌的能力。为揭示预压装配式框架结构鲁棒性优劣，利用SAP2000软件考虑节点半刚性建立预压装配式框架结构（Prestressed Concrete Structure, PC结构）及现浇结构（Reinforce Concrete Structure, RC结构）模型，基于抽柱法模拟四种工况：角柱、长边中柱、短边中柱和框架中柱失效，采用非线性静力分析方法，从承载力变化情况及抗倒塌机制等方面对比不同失效位置工况下PC结构和RC结构抗竖向连续倒塌的性能，以此研究PC结构的鲁棒性。结果表明：PC结构和RC结构倒塌模式相似：角柱、长边中柱均为梁机制，而短边中柱、框架中柱均为悬链线机制；PC结构各工况倒塌时的竖向位移均大于RC结构，延性更好；受其节点连接刚度的影响，PC结构鲁棒性系数（3.197）略小于RC结构（3.257），因此通过增强PC结构节点连接的刚度，可改善结构构件的鲁棒性。

Research on the Robustness of Pre-stressing Fabricated Frame Structure Based on Bearing Capacity

Structural robustness refers to the ability of building structures to withstand local damage and prevent continuous collapse. In order to reveal the advantages and disadvantages of pre-stressing fabricated frame structure robustness, the models of pre-stressing fabricated frame structure (Prestressed Concrete Structure, PC structure) and cast-in-place structure (Reinforce Concrete Structure, RC structure) are established by using SAP2000 software considering the semi-rigidity of joints. Four working conditions are simulated based on the column extraction method: if corner column, long side middle column, short side middle column and frame middle column are failed, the nonlinear static analysis method will be adopted, by which the performance of PC structure and RC structure against vertical continuous collapse under different failure positions is compared from the aspects of bearing capacity change and anti-collapse mechanism, so as to study the robustness of PC structure. The results show that the collapse modes of PC structure and RC structure are similar: the corner column and long side middle column are beam mechanism, while the short side middle column and frame middle column are catenary mechanism; the vertical displacement of PC structure during collapse is greater than that of RC structure, and the ductility of PC structure is better; affected by the joint stiffness, the robustness coefficient of PC structure (3.197) is slightly less than that of RC structure (3.257). Therefore, the robustness of structural members can be improved by enhancing the joint stiffness of PC structure.