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事实上,根据设计和荷载规范进行抗震设计时,需要确定地震反应修正系数R、高强度系数Ω0和变形放大系数Cd。针对结构的横向支撑系统,也即V形支撑(CKB)对上述系数进行评估。这类支撑系统中的V形构件在支撑系统内形成弯曲或剪切塑性铰,有助于系统的能量耗散。采用基于低概率结构倒塌的FEMAP695方法进行研究,包含非线性静动力学分析。通过静力弹塑性分析研究这种支撑的高强度和延性。通过增量动力分析(IDA)获得原始模型的抗倒塌储备系数(CMRs),并对其进行修改,得到每个原始模型调整后的抗倒塌储备系数(ACMR)。计算得到的ACMRs满足考虑了整体系统倒塌的不确定性的FEMAP695的要求,证明了CKB系统假定的抗震性能影响因素的有效性。
In fact, seismic design based on design and load specifications requires that the seismic response correction factor R, the high-strength factor Ω0, and the deformation magnification factor Cd be determined. The above-mentioned coefficients were evaluated against a structural lateral support system, also known as V-shaped support (CKB). The V-shaped members in such support systems form curved or shearing plastic hinges within the support system, helping to dissipate the energy of the system. A FEMAP695 method based on the collapse of low-probability structures was used to investigate nonlinear static-dynamic analysis. The high strength and ductility of this support are studied by static elasto-plastic analysis. The anti-collapse reserve coefficients (CMRs) of the original model were obtained by incremental dynamic analysis (IDA) and modified to obtain the adjusted anti-collapse reserve factor (ACMR) for each original model. The calculated ACMRs meet the requirements of FEMAP695, which takes into account the uncertainty of the overall system collapse, and proves the effectiveness of the assumed seismic performance factors of CKB system.