多层斜拉索钢抗弯框架体系及抗侧力性能

Multi-Storey Cable-Stayed Steel Moment Resistant Frame and Its Lateral Force Resisting Performance

提出了一种新型抗侧力体系——多层斜拉索钢抗弯框架(CSMRF)体系.CSMRF体系综合了钢抗弯框架和斜拉索的各自优点,有效地提升了原钢抗弯框架结构的抗侧能力.而且,CSMRF具有双重抗震防线和自复位能力.阐述了CSMRF体系的组成和作用机理;推导出在水平荷载作用下CSMRF体系的水平位移近似计算公式;使用该近似计算公式对CSMRF进行了数值分析.结果表明:在相同水平荷载作用下,CSMRF体系的层间位移和楼层位移均明显比同条件钢抗弯框架体系的小;建立的多层CSMRF体系位移近似计算公式可以为CSMRF体系中拉索和钢框架的初步设计提供理论依据.

A new lateral force resisting system （LFRS）, referred to as the multi-storey cable-stayed steel moment resistant frame （CSMRF） system, was proposed in this paper. The CSMRF integrates the respective advantages of both the steel moment resistant frame （MRF） and inclined cables, thus effectively promoting the lateral resistant capacity of the original MRF. Likewise, the CSMRF renders both the dual seismic defense line and self-centering capacity. The composition and working mechanism of the CSMRF were introduced. The floor displacement （relative to the ground） approximation formula was developed for the CSMRF under the lateral loading. The numerical analysis was made of the CSMRF with resorting to the developed approximation formula. The results show that the interstory drift and the floor displacement were significantly reduced with respect to the original steel MRF. The approximate calculation formula of elastic floor displacements for multi-storey CSMRF system can provide a theoretical basis for the preliminary design of its components.