防震縫設(shè)置對(duì)L形平面不規(guī)則RC框架抗震性能的影響
劉哲鋒, 張杰, 胡適, 何婉璐
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（長沙理工大學(xué)土木與建筑學(xué)院， 長沙 410004)
［摘要］基于算例分析討論設(shè)置防震縫對(duì)L形平面不規(guī)則RC框架抗震性能的影響，所選算例主要考慮樓層數(shù)和平面凹進(jìn)尺寸占相應(yīng)投影向總尺寸的比例的不同。選用8條地震波，采用MIDAS/Building軟件對(duì)40個(gè)算例結(jié)構(gòu)分別進(jìn)行7度多遇地震和罕遇地震下的時(shí)程分析。結(jié)果表明，多遇地震下，設(shè)置防震縫會(huì)增大結(jié)構(gòu)最大層間位移角；罕遇地震下，設(shè)置防震縫后，大多數(shù)情況下結(jié)構(gòu)的最大層間位移角增大。設(shè)置防震縫后，結(jié)構(gòu)如果剛度對(duì)稱，扭轉(zhuǎn)效應(yīng)大幅減小，若剛度不對(duì)稱，則不對(duì)稱部分的最大層間扭轉(zhuǎn)角將會(huì)大于原結(jié)構(gòu)；同時(shí)設(shè)置防震縫會(huì)小幅增加結(jié)構(gòu)的鋼筋用量，主要原因是設(shè)置防震縫所導(dǎo)致梁柱數(shù)量增多。［關(guān)鍵詞］防震縫; 平面不規(guī)則框架; 層間位移角; 層間扭轉(zhuǎn)角中圖分類號(hào)：TU375.4 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2015)22-0029-05
Effect of setting seismic joints on seismic behavior of L-shaped irregular plane RC framesLiu Zhefeng, Zhang Jie, Hu Shi, He Wanlu(School of Civil Engineering and Architecture, Changsha University of Science & Technology, Changsha 410004, China)Abstract: The effect of setting seismic joints on seismic behavior of L-shaped irregular plane RC frames was discussed based on numerical examples which include frames with different stories and different proportion of recessed planar dimension to the overall dimension in the relevant projection direction. By using MIDAS/Building software, time-history analyses were carried out on 40 RC frames under frequent and rare earthquakes of 7 degree respectively. The analysis shows that setting seismic joints increases the maximum drift angle under frequent earthquake and increases the maximum drift angle under rare earthquake at the most time. If the structure stiffness is symmetric after setting seismic joints, torsion effect is greatly reduced. If the structure stiffness is asymmetric after setting seismic joints, the maximum inter-story torsion angle of the asymmetric part is larger than the original structure. Setting seismic joints slightly increases steel consumption, because of the increase in the number of beams and columns due to setting seismic joints.Keywords: seismic joint; irregular plane frame; inter-story drift angle; inter-story torsion angle
作者簡介：劉哲鋒，副教授，博士，Email：Lzf0072006@163.com。
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