上下盘断层参数对RC框架结构地震响应研究(Ⅰ:非隔震)  

Effects of hanging wall/footwall fault parameters on seismic responses of RC frame structures(Ⅰ: non-isolated structures)

作　　者：汪大洋[1] 张永山[1] 唐承志[1] 韩启浩 WANG Dayang;ZHANG Yongshan;TANG Chengzhi;HAN Qihao(School of Civil Engineering, Guangzhou University, Guangzhou 510006, China)

机构地区：[1]广州大学土木工程学院,广州510006

出　　处：《振动与冲击》2018年第5期13-19,27,共8页Journal of Vibration and Shock

基　　金：国家基金项目(51378135;51778162); 广州市科研项目(201607010151;1201581632)

摘　　要：为系统研究上下盘断层参数对钢筋混凝土框架结构动力响应的影响,首先建立并验证了4层、8层、12层及16层涵盖常见周期范围的四类RC框架结构,其次以622条上下盘地震动记录为评判标准,针对三种NGA地震动衰减关系模型(ASK模型、CB模型和CY模型)开展最优拟合方法优选工作,最后基于最优模型拟合得到的160条上下盘地震动,进一步探讨了震级、土体剪切波速、断层倾角、上界埋置深度等参数与上下盘地震动PGA之间的关系,研究了上下盘断层参数对四类RC框架结构动力响应的影响规律。结果表明,ASK模型能够很好地模拟上下盘地震动,与实际地震记录吻合度最好;上下盘地震动PGA随场地距离的减小而不断增大、随震级增大而不断增大,断层倾角仅在上盘场地距离20 km以内时对PGA有较大影响,土体剪切波速和上界埋置深度对PGA影响不大;四类框架结构的动力响应均随场地距离和土体剪切波速的减小而增大、随震级和结构高度的增长而增大,在下盘场地距离一定时断层倾角和上界埋置深度对结构动力响应基本无影响;上盘地震动对低层框架结构动力响应的影响较大,下盘地震动对高层框架结构动力响应的影响较大。Dynamic models for RC frame structures with4-floor,8-floor,12-floor and16-floor covering common period ranges were established and verified to systematically investigate effects of hanging wall/footwall fault parameters on dynamic responses of RC frame structures.Three NGA ground motion attenuation relation models including ASK,CB and CY models were adopted to fit hanging wall/footwall earthquake records for purposes of comparison and optimization.The optimal fitting model was determined through comparison between fitted results and real622hanging wall/footwall ground motion records.Finally,160hanging wall/footwall earthquake samples with different fault parameters were fitted based on the optimal NGA model.The relations between hanging wall/footwall ground motion PGA and parameters,such as,earthquake magnitude,soil body shear wave velocity,fault dip angle and upper bound embedded depth were investigated.The effects of hanging wall/footwall fault parameters on dynamic responses of four RC frame structures were studied.The results showed that ASK model can simulate hanging wall/footwall earthquakes well and its simulated results agree best with real earthquake records;PGAs of hanging wall/footwall earthquakes increase with decrease in site distance and increase in earthquake magnitude;fault dip angle has a larger influence on PGAs within hanging wall site distance of20km;soil body shear wave velocity and upper bound embedded depth have little effects on PGAs;dynamic responses of four RC frame structures increase with decrease in site distance and soil body shear wave velocity,they increase with increase in earthquake magnitude and structure height;fault dip angle and upper bound embedded depth have almost no effect on structural dynamic responses under a certain footwall site distance;hanging wall earthquakes have a larger effect on dynamic responses of lower RC frame structures,while footwall earthquakes have a bigger effect on dynamic responses of higher ones.

关 键 词：上下盘地震 断层参数 拟合 RC框架结构 动力响应 

分 类 号：TU973.23[建筑科学—结构工程]