【摘要】 为合理评估半刚接钢框架内填RC墙结构(简称PSRCW)的延性及强度折减系数,文中利用Latin超立方抽样方法考虑PSRCW结构中型钢、钢筋及混凝土材料力学性能的随机性,提出一种基于Pushover方法评估PSRCW结构延性及强度折减系数的概率方法。根据现行抗震设计规范设计4组160个PSRCW算例样本,重点考察了层数、抗震设防烈度、水平荷载分布模式等因素的影响,利用Pushover方法确定160个PSRCW算例的抗侧能力曲线,基于概率方法按置信水平为95%的单侧置信下限确定PSRCW结构的延性及强度折减系数。研究结果表明,随着层数的增加,PSRCW结构的延性及强度折减系数均呈降低趋势;设防烈度对PSRCW结构的延性折减系数影响不明显,但对强度折减系数影响较大;均匀分布模式作用下确定的PSRCW结构的延性及强度折减系数均显著大于按广义乘方分布模式的分析结果。更多还原

【Abstract】 In order to reasonably evaluate the ductility and strength reduction factor of partially-restrained steel frame with RC infill walls( PSRCW),an innovative probability-based method of determining the ductility and strength reduction factor of PSRCW was proposed. The randomness of materials( including of steel,steel bar and concrete) was considered through the Latin-hypercubic sampling approach. A total of 160 PSRCW structures were designed according to current seismic specifications,and the effects of the number of floors,seismic precautionary intensity,and lateral load distribution mode were also investigated. The lateral resistance curves of 160 PSRCW structures were developed based on the pushover analysis,and the ductility and strength reduction factors of PSRCW were determined by using the probability method according to the confidence level of 95%. The analytical results show that the ductility and strength reduction factor of PSRCW exhibit the decreasing tendency with the increase of the number of floors. The seismic precautionary intensity does not produce any obvious effect on the ductility reduction factor of PSRCW,but has the significant influence on the strength reduction factor of PSRCW. Additionally,the ductility and strength reduction factor of PSRCW determined by uniform lateral load distribution mode is much larger than the ones determined by the generalized power load distribution mode.更多还原