P-SFG体系整体结构模型抗震性能分析

Analysis of seismic performance of total structure model of P-SFG system

装配式门形支撑铰接钢框架结构P-SFG体系是一种由支撑和钢框架组成的快速建造钢结构抗震体系,其加设支撑的刚接跨承担水平荷载,框架承担竖向荷载,受力明确、构造简单,适合装配化施工及建筑工业化要求。文章采用有限元软件对2层2×3跨模型进行了弹性分析及动力时程分析,验证了其破坏形态,并采用简化计算模型的理论分析结果对有限元分析的合理性进行了验证。结果表明:P-SFG体系适用于设防烈度8度的低层房屋,其抗震性能良好;P-SFG体系在罕遇地震烈度下整体弹塑性抗侧性能良好;结构破坏形态符合"强梁柱,弱支撑"的设计理念;有限元分析结果与理论计算结果误差在10%以内,工程应用中可用其进行分析计算。

The structural system of the assembled hinged steel frame with gate-shaped braces（PSFG） is a steel anti-seismic structure system,which consists of bracing and steel frames for rapid construction. The steel frame bear the vertical force and the horizontal force shall be borne by braces.The new system has simple structure and clear force transmission, which suit the development requirements of assembly of construction and steel structure building industrialization. The elastic analysis and dynamic time-history analysis of two-layer 2 × 3 cross model were carried out by finite element software,and the destructive morphology was verified by the analysis. The rationality of finite element analysis was confirmed by the theoretical analysis of the simplified model. The results are shown below. The P-SFG system is applicable to low rise buildings with seismic fortification intensity below 8; the torsion resistance performance of P-SFG system is good; the elastic-plastic overall lateral resistance of the P-SFG system is great under the rare earthquake intensity; the structural failure mode conforms to the design concept of ＂strong beam-column and weak braces ＂; the difference value between the result of finite element analysis and the result of theoretical analysis was less than 10 %,and finite element analysis software can be used in its practical application.