速度脉冲型地震动对隔震结构减震系数影响研究*
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(云南省地震工程研究院， 昆明 650041)
［摘要］选取91组速度脉冲时程，每组均包括原始时程和去掉速度脉冲后的时程。按震中距把91组时程分成11类，统计结果表明：速度脉冲主要分布在震中距50km以内，约占80%，再考虑到每一类时程的数量不悬殊，将11类时程按震中距归并为7类。以实际高层钢筋混凝土框架结构工程为例，将这7类时程作为地震动输入分别进行隔震计算。结果表明：采用含速度脉冲时程进行隔震计算时，层间剪力和减震系数分别是采用不含速度脉冲时程计算结果的1.45～1.82倍和1.40倍，两者基本呈先增大后减小趋势；提出了速度脉冲型地震动工程特性研究，含速度脉冲时程与不含速度脉冲时程应具有同源性准则。［关键词］速度脉冲; 地震动; 隔震; 层间剪力; 减震系数中图分类号：TU375.4 文献标识码：A 文章编号：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），国家科技支撑计划项目（2012BAJ07B02），云南省社会事业发展专项（2008CA007）。作者简介：宋廷苏，硕士，工程师，Email: 15808859649@163.com。
