速度脈沖型地震動對隔震結(jié)構(gòu)減震系數(shù)影響研究*
宋廷蘇，安曉文，阿拉塔，管慶松
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(云南省地震工程研究院， 昆明 650041)
［摘要］選取91組速度脈沖時程，每組均包括原始時程和去掉速度脈沖后的時程。按震中距把91組時程分成11類，統(tǒng)計結(jié)果表明：速度脈沖主要分布在震中距50km以內(nèi)，約占80%，再考慮到每一類時程的數(shù)量不懸殊，將11類時程按震中距歸并為7類。以實際高層鋼筋混凝土框架結(jié)構(gòu)工程為例，將這7類時程作為地震動輸入分別進(jìn)行隔震計算。結(jié)果表明：采用含速度脈沖時程進(jìn)行隔震計算時，層間剪力和減震系數(shù)分別是采用不含速度脈沖時程計算結(jié)果的1.45～1.82倍和1.40倍，兩者基本呈先增大后減小趨勢；提出了速度脈沖型地震動工程特性研究，含速度脈沖時程與不含速度脈沖時程應(yīng)具有同源性準(zhǔn)則。［關(guān)鍵詞］速度脈沖; 地震動; 隔震; 層間剪力; 減震系數(shù)中圖分類號：TU375.4 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2015)14-0024-06
Study on seismic isolation coefficient of seismic isolation structure subjected to velocity pulse ground motionSong Tingsu, An Xiaowen, A Lata, Guan Qingsong(Yunnan Institute of Earthquake Engineering, Kunming 650041, China)Abstract: Ninety-one groups of velocity pulse time histories were selected, each velocity plus time history included the original time history and the time history without the velocity. Ninety-one groups of velocity pulse time histories were classified into eleven categories according to the epicenter distance. The results show that 80% of velocity pulse time histories mainly distribute within 50km from the epicenter. Eleven categories time histories were divided based on epicenter distance into seven categories. Taking a high-rise reinforced concrete frame structure project as an example, the structural seismic isolation analyses were carried out in which the seven categories time histories were used as ground motion inputs. The results indicate that the inter-story shear force and seismic isolation coefficient considering velocity pulse time history is 1.45 to 1.82 times and 1.40 times respectively as that not considering velocity pulse time history. The two parameters firstly increases and then decreases in trend. It's suggested that the time history with and without velocity pulse should be homologous in project characteristics research of velocity pulse type ground motion.Keywords:velocity pulse; ground motion; seismic isolation; inter-story shear force; seismic isolation coefficient
*云南省地震局青年基金（201207），國家科技支撐計劃項目（2012BAJ07B02），云南省社會事業(yè)發(fā)展專項（2008CA007）。作者簡介：宋廷蘇，碩士，工程師，Email: 15808859649@163.com。
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