竖向承重与水平抗侧相分离的组合框架-剪力墙结构体系抗震性能研究

为提高传统钢结构体系在住宅产业化应用中的标准化程度、装配化效率以及安全性能，提出了竖向承重与水平抗侧相分离的组合框架-剪力墙结构体系，并对其抗震性能进行了分析与评价。以某高层住宅楼工程为结构方案原型，基于多遇地震作用下弹性层间位移角相同的控制标准，分别按传统组合框架-剪力墙结构体系和按竖向承重与水平抗侧相分离的组合框架-剪力墙结构体系设计了两种结构方案，并建立了相应的有限元模型。采用静力弹塑性推覆方法，对两种体系在设防地震和罕遇地震作用下的变形和受力特征进行了对比分析，通过结构层间变形、关键构件损伤状态以及安全系数等指标对体系抗震性能进行了综合评估。分析结果表明：竖向承重与水平抗侧相分离的组合框架-剪力墙结构体系在地震作用下的侧移模式呈弯曲型，推覆过程中结构塑性铰主要出现在底层柱端，而传统组合框架-剪力墙结构体系侧移模式呈弯剪型，塑性铰主要出现在梁端；选取的两种剪力墙损伤判断标准均可用于准确判断两种结构方案的极限状态；在相同弹性层间位移角控制标准下，竖向承重与水平抗侧相分离的组合结构体系设计方案安全系数指标值更高，在地震作用下具备更高安全储备。

Seismic performance evaluation of composite structural system with separated gravity and lateral load resisting systems

To improve the standardization degree, assembly construction efficiency, safety and durability of traditional steel structure systems in residential industrialization applications, a new composite structural system with separate gravity and lateral load resisting systems was proposed in this paper, and its seismic performance is analyzed and evaluated. Using a real high-rise residential building as the prototype, two structural systems, namely, the traditional composite frame-shear wall structure and the newly proposed composite structure, were designed and the corresponding finite element models were established based on the control criteria of the same elastic inter story drift ratio limit under frequent earthquake. A comparative analysis of these two systems, focused on both the deformation and stress characteristics, was carried out using the static elastic-plastic pushover method. Their seismic performances were evaluated using the indicators such as the inter-story displacement, damage states of key components and safety factor. The results show that: the composite structural system with separate gravity and lateral load resisting systems has a bending-type lateral deformation pattern, and the plastic hinges mostly appears at the bottom column end during the pushover process. By contrast, the traditional composite frame-shear wall structure has a bending-shear mixed type lateral deformation pattern, and the plastic hinges mostly appears at the beam ends. The two criteria of shear wall damage adopted in this paper are both applicable to identifying the ultimate state of two structure schemes. When controlled by the same inter-story drift design criterion, the composite structure system with separate gravity and lateral load resisting systems has a higher safety factor and thus a larger safety margin, compared with the traditional system.