【摘要】 结合汶川地震中钢筋混凝土框架结构的塑性铰普遍出现在柱端的震害现象,重点研究了"强柱弱梁"措施和"超烈度"对结构抗震性态的影响。按中国规范分别设计7度0.1 g区和0.15 g区三级抗震规则空间框架,并采用逐渐增大的"强柱弱梁"措施,对两类7度区框架各形成5个算例结构。在Open Sees平台上,计算框架在双向水平地震作用下的非线性反应。结果表明,抗震规范GB50011-2001给出的三级抗震的"强柱弱梁"措施取值明显偏低,在罕遇地震作用下7度0.1 g区框架塑性铰数量少、基本为柱铰,7度0.15 g区框架塑性铰数量较多、梁铰少。抗震规范GB50011-2010提高柱端弯矩增大系数取值后,结构的塑性铰分布规律基本没有改善。按抗震规范GB50011-2001设计的7度区空间框架在"超烈度"地震波作用下的损伤特征是塑性铰普遍出现在柱端,与汶川地震的震害现象一致,7度区框架的梁端地震组合弯矩小、现浇板钢筋影响幅度大、"强柱弱梁"措施过低、结构遭遇"超烈度"共同导致了该危险的塑性铰分布特征。更多还原

【Abstract】 Based on damage characteristics of Wenchuan earthquake that plastic hinges of reinforced concrete( RC) frame structures appeared prevalently at column ends,the influences of"strong column weak beam"measures and super intensity earthquake on aseismic performance of structures were analyzed. Regular spatial frames for 7 earthquake intensity 0. 1 g region and 0. 15 g region were designed according to the specifications of the 3rd class aseismic rules in Chinese code,respectively. By increasing "strong column and weak beam"measures gradually,five examples for each kind for 7 earthquake intensity regions’ frames were obtained. Based on the Open Sees framework,nonlinear responses of every frame under bi-directional horizontal earthquake excitations were calculated. The results showed that when the"strong column and weak beam"measures of code GB50011-2001 are adopted,for 7 earthquake intensity 0. 1 g region’s frame,the number of plastic hinges is less,almost all plastic hinges appear at column ends under rare earthquake; while for 0. 15 g region’s frame,the number of plastic hinges is larger,plastic hinges rarely appear at beam ends; when the value of the moment amplification factor of column end of the 3rd class aseismic rule is improved according to the aseismic code GB50011-2010,almost no improvement of plastic hinges distribution can be found; the characteristics of plastic hinges distribution for 7 earthquake intensity regions’ frames designed with the "strong column and weak beam"measures of code GB50011-2001 under super intensity earthquake are plastic hinges appearing prevalently at column ends,they areconsistent with damage characteristics of Wenchuan earthquake; for the frames of 7 earthquake intensity regions,the dangerous plastic hinges distribution characteristics are due to comprehensive effects of smaller combination moment of beam ends,bigger influence of reinforcement of site casting slab,too weak"strong column and weak beam"measures and super intensity earthquake.更多还原