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(重慶大學(xué)土木工程學(xué)院  400045)
［提要］為了識別強(qiáng)柱弱梁措施的實(shí)際抗震控制效果，對影響框架結(jié)構(gòu)梁、柱端抗彎能力及二者相對強(qiáng)度的因素進(jìn)行了分析歸納。嚴(yán)格按中國規(guī)范設(shè)計(jì)出5個(gè)不同地震烈度分區(qū)的規(guī)則平面框架結(jié)構(gòu)，考察了這些結(jié)構(gòu)在采取強(qiáng)柱弱梁措施后其柱、梁之間的實(shí)際強(qiáng)度級差系數(shù)及其規(guī)律，對這些框架進(jìn)行了多波輸入下的非彈性動(dòng)力反應(yīng)分析。結(jié)果表明，在罕遇地震下，9度區(qū)(一級抗震等級)框架形成了抗震性能良好的梁鉸機(jī)構(gòu)；而8度區(qū)二級抗震等級和7度區(qū)三級抗震等級的框架形成了以柱鉸為主或柱鉸偏多的梁、柱鉸混合機(jī)構(gòu)。分析結(jié)果揭示出，在現(xiàn)行強(qiáng)柱弱梁措施的調(diào)控下，不同抗震等級的框架結(jié)構(gòu)在強(qiáng)震下所形成的塑性耗能機(jī)構(gòu)存在明顯差異，并可能導(dǎo)致在抗震安全水平上的不一致性。
［關(guān)鍵詞］框架結(jié)構(gòu)；強(qiáng)柱弱梁；非彈性動(dòng)力分析；塑性耗能機(jī)構(gòu)；抗震性能
Actual Control Effect of Strongcolumn and Weakbeam Measures of Reinforced Concrete Frame Structures in China/Wei Feng, Fu Jianping, Bai Shaoliang(Faculty of Civil Engineering, Chongqing University, Chongqing 400045, China)
Abstract:To verify the actual control effect of the strongcolumn and weakbeam measures, the factors influencing bending capacities of columns and beams and their relative strengths are analyzed and summarized. Five regular reinforced concrete frames are designed conformed to the Chinese code in different seismic fortification intensity. The actual strength hierarchy between columns and beams are investigated after the columns enhanced. The nonlinear dynamic response analysis of these frames under multiwave input is carried out. The results show that under major earthquake, the frame of seismic grade 1 in earthquake intensity 9 region forms a beamhinge mechanism with satisfactory seismic performance, and the frames of seismic grade 2 in earthquake intensity 8 region and seismic grade 3 in earthquake intensity 7 region form columnhingedominated mechanisms or ones with majority of columnhinge. The results show the distinct difference of plastic energydissipated mechanisms of frames in different seismic grades under strong motions and the inconsistence in antiearthquake safety level between these structures, which could be a reference for the code administrative group.
Keywords:frame structures; strongcolumn and weakbeam measures; nonlinear dynamic analysis; plastic energydissipated mechanism; seismic performance
*國家自然科學(xué)基金資助項(xiàng)目(59878056)。