多维爆破地震动作用下框架结构动态响应有限元时程分析  

Finite-element time-history analysis of dynamic response of frame structure under multi-dimensional blasting vibration

作　　者：陈士海[1] 魏海霞[1,2] 张安康[1] 毕卫国[1] 

机构地区：[1]山东科技大学土木建筑学院,青岛266510 [2]河南理工大学土木工程学院,焦作454003

出　　处：《振动与冲击》2010年第9期134-137,共4页Journal of Vibration and Shock

基　　金：国家自然科学基金(50778107);高等学校博士学科点专项科研基金(20060424002)资助项目;山东省"泰山学者"建设工程专项经费资助

摘　　要：爆破震动的幅值、频率与持续时间是影响结构爆破震动响应与破坏的重要参数,爆破安全规程规定地面建筑物的爆破震动判据采用质点峰值震动速度和主震频率,但没有指明是三向速度的合速度还是单向速度,给爆破震动判据应用带来不便。采用有限元时程分析讨论了不同爆破震动频率速度荷载作用下结构的动态响应,指出在较高频率的爆破震动荷载作用下,框架结构对竖直向地震波响应较大,易在竖直向地震波作用下产生破坏,并可以将三维爆破震动中最大震动速度幅值作为爆破震动安全标准值;在较低频率的爆破地震荷载作用下,震动的水平荷载引起结构的破坏是主要的,应考虑水平最大荷载的爆破震动安全标准值。即结构抗震的安全标准在高频时以垂直荷载速度峰值为准;在低频时以水平荷载速度峰值为准。Safety regulations of blasting stipulates that the criteria of structural blasting vibration are the peak vibration speed of mass point and the main vibration frequency,but it doesn't point out whether the speed is total speed of three directions or one direction speed,which makes trouble to apply the blasting vibration criterion.In the paper,the structural dynamic responses under different blasting vibration frequency-speed-loads were discussed by use of the finite-element time-history analysis,and it is pointed out that under higher frequency blasting loads,the frame-structural response due to vertical blasting vibration is greater,which means the structure will get broken much more easily under vertical blasting vibration.So,the maximum speed amplitude among the three-dimensional components of blasting vibration can be used as the safety standard of blasting vibration.Under blasting vibration loads of lower frequency,structural damage caused by horizontal blasting load is the primary.So,the maximum horizontal load should be used as the blasting vibration safety standard.Namely,the vertical speed amplitude under high-frequency loads or the horizontal speed amplitude under low-frequency loads can be used as vibration-resistant safety standard.

关 键 词：爆破地震动 结构动态响应 有限元时程分析 频率 

分 类 号：TD235.1[矿业工程—矿井建设]