高强钢组合D型偏心支撑框架抗震性能分析

Seismic behavior analysis of D-type eccentrically braced frames structure combined with high strength steel

高强钢组合偏心支撑结构是梁柱采用高强钢材,耗能梁段采用普通钢材的新型结构体系。采用ABAQUS有限元软件建立了9个不同层数与钢材强度组合D型偏心支撑框架有限元模型,进行了滞回性能分析。通过与普通钢D型偏心支撑框架结构对比,表明虽然高强钢组合D型偏心支撑的滞回性能略差,但随着结构层数的增加,其延性、耗能能力与普通钢偏心支撑结构的差距逐渐减小,且具有结构承载力高和刚度退化慢的优点,适用于高层结构。同时,由于高强钢构件截面较小,可以大大减少结构用钢量,因此有较高的经济效益。综合各因素考虑,建议在设计9层至14层D型偏心支撑结构时采用高强钢,钢材宜采用Q460。

Strength steel composite D-type eccentrically braced frame is a kind of new structural system. Its columns and beams are made of high strength steel, meanwhile its links are ordinary steel 9 finite element models with different layers both of high strength steel composite D-type eccentrically braced frame （EBF） and ordinary steel D-type EBF were established in ABAQUS FEA software. According to the comparation with ordinary eccentric braced frames. It proved that： although the seismic performance of the high strength steel composite D-type EBFs were a little poorer than that of their counterparts under the same design conditions. However, with the increasing of the number of layers, the seismic performance and energy dissipation of the high strength steel composite D-type EBFs are becoming closer with that of the ordinary eccentric braced frames. Also the high strength steel composite D-type EBFs has higher bearing capacity and lower velocity of the decrease of ductility. It applies to structures with more layers. At the mean time, with the decreasing of component section, the steel consumption has been decreased greatly which leads to good economy benefit. Above all, the high strength steel composite D-type eccentrically braced frame （EBF） should be used when the layers of structures are between 9 and 14 high strength steel of Q460 are recommended.