爆破地震荷载作用下建筑结构的动力响应分析
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摘要
建筑结构在爆破地震荷载作用下的动力响应,是爆破安全设计和建筑物防护的重要依据。以某次爆破工程实测地震波为基准输入参量,采用ANSYS/LS-DYNA构建数值分析模型,分析了4层建筑结构在不同爆破震动速度和主频下的动力响应特性。结果表明:结构的振动速度和位移均随爆破震动速度的增大而增大,结构底部的应力和应变高于上部,结构各部分振动速度随高度的增加具有不同程度的放大作用;爆破震动主频与结构固有频率越接近,结构物的振幅就越大。
The dynamic response of building structure under blasting seismic loads is an important basis for the blasting safety design and building protection. Taking a monitored blasting seismic wave as input parameter,and using ANSYS / LS-DYNA to build numerical analysis model,the dynamic response characteristics of a four-story building structure at different blasting vibration velocity and the main frequency were analyzed. The results show that the vibration velocity and the displacement of the structure increased with the blasting vibration velocity increasing; the stress and strain at the structure bottom was higher than the upper' s; the structure vibration velocity increased with height increasing with different amplification degrees; more close to blasting vibration frequency and the natural frequency of structure,the greater amplitude of structure would be obtained.
The dynamic response of building structure under blasting seismic loads is an important basis for the blasting safety design and building protection. Taking a monitored blasting seismic wave as input parameter,and using ANSYS / LS-DYNA to build numerical analysis model,the dynamic response characteristics of a four-story building structure at different blasting vibration velocity and the main frequency were analyzed. The results show that the vibration velocity and the displacement of the structure increased with the blasting vibration velocity increasing; the stress and strain at the structure bottom was higher than the upper' s; the structure vibration velocity increased with height increasing with different amplification degrees; more close to blasting vibration frequency and the natural frequency of structure,the greater amplitude of structure would be obtained.
引文
[1]李德林,方向,齐世福,等.爆破震动效应对建筑物的影响[J].工程爆破,2004,10(2):66-69.
[1]LI De-lin,FANG Xiang,QI Shi-fu,et al.Effect of blasting vibration on structures[J].Engineering Blasting,2004,10(2):66-69.(in Chinese)
[2]魏海霞,陈士海.爆破地震波三要素对多层砌体结构弹塑性地震响应的影响[J].爆炸与冲击,2011,31(1):55-61.
[2]WEI Hai-xia,CHEN Shi-hai.Effect of three main factors of blasting seismic waves on elastic-plastic seismic response of multistory masonry buildings[J].Explosion and Shock Waves,2011,31(1):55-61.(in Chinese)
[3]毕卫国,石崇.爆破地震波引起结构响应的频率因素分析[J].爆破,2004,21(3):87-89.
[3]BI Wei-guo,SHI Chong.Analysis on frequency factor in structure response induced by blasting seimic wave[J].Blasting,2004,21(3):87-89.(in Chinese)
[4]贠永峰,张方.爆破模拟地震动下框架抗震性能试验分析[J].工程爆破,2014,20(2):21-24.
[4]YUN Yong-feng,ZHANG Fang.Study on seismic performance of frame structures under blasting vibration simulating earthquake[J].Engineering Blasting,2014,20(2):21-24.(in Chinese)
[5]曹孝君,张继春,吕和林.频率对爆破地震作用下结构的动力响应的影响研究[J].爆破,2006,23(2):14-19.
[5]CAO Xiao-jun,ZHANG Ji-chun,LV He-lin.Effect of frequency on the dynamic response of structure resulting from blasting seism[J].Blasting,2006,23(2):14-19.(in Chinese)
[6]姚强,杨兴国,陈兴泽,等.大型地下厂房开挖爆破振动动力响应数值模拟[J].振动与冲击,2014,33(6):66-70.
[6]YAO Qiang,YANG Xing-guo,CHEN Xing-ze,et al.Numerical simulation of dynamic response of large underground powerhouse subjected to blasting vibration[J].Journal of Vibration and Shock,2014,33(6):66-70.(in Chinese)
[7]刘伯权.建筑结构抗震设计[M].北京:中国建材工业出版社,1996.
[8]WU Cheng-qing,HAO Hong,LU Yong.Dynamic response and damage analysis of masonry structures and masonry in filled RC frames to blast ground motion[J].Engineering Structures,2005(27):323-333.
[1]LI De-lin,FANG Xiang,QI Shi-fu,et al.Effect of blasting vibration on structures[J].Engineering Blasting,2004,10(2):66-69.(in Chinese)
[2]魏海霞,陈士海.爆破地震波三要素对多层砌体结构弹塑性地震响应的影响[J].爆炸与冲击,2011,31(1):55-61.
[2]WEI Hai-xia,CHEN Shi-hai.Effect of three main factors of blasting seismic waves on elastic-plastic seismic response of multistory masonry buildings[J].Explosion and Shock Waves,2011,31(1):55-61.(in Chinese)
[3]毕卫国,石崇.爆破地震波引起结构响应的频率因素分析[J].爆破,2004,21(3):87-89.
[3]BI Wei-guo,SHI Chong.Analysis on frequency factor in structure response induced by blasting seimic wave[J].Blasting,2004,21(3):87-89.(in Chinese)
[4]贠永峰,张方.爆破模拟地震动下框架抗震性能试验分析[J].工程爆破,2014,20(2):21-24.
[4]YUN Yong-feng,ZHANG Fang.Study on seismic performance of frame structures under blasting vibration simulating earthquake[J].Engineering Blasting,2014,20(2):21-24.(in Chinese)
[5]曹孝君,张继春,吕和林.频率对爆破地震作用下结构的动力响应的影响研究[J].爆破,2006,23(2):14-19.
[5]CAO Xiao-jun,ZHANG Ji-chun,LV He-lin.Effect of frequency on the dynamic response of structure resulting from blasting seism[J].Blasting,2006,23(2):14-19.(in Chinese)
[6]姚强,杨兴国,陈兴泽,等.大型地下厂房开挖爆破振动动力响应数值模拟[J].振动与冲击,2014,33(6):66-70.
[6]YAO Qiang,YANG Xing-guo,CHEN Xing-ze,et al.Numerical simulation of dynamic response of large underground powerhouse subjected to blasting vibration[J].Journal of Vibration and Shock,2014,33(6):66-70.(in Chinese)
[7]刘伯权.建筑结构抗震设计[M].北京:中国建材工业出版社,1996.
[8]WU Cheng-qing,HAO Hong,LU Yong.Dynamic response and damage analysis of masonry structures and masonry in filled RC frames to blast ground motion[J].Engineering Structures,2005(27):323-333.
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