爆破地震动三向荷载分量对结构动态响应研究

爆破地震动的地面运动对建筑物的作用是多分量的，以前，主要集中在单向竖直地面运动作用的结构响应方面，很少考虑多维地震动作用下的结构响应。通过时程分析方法分析在多维地震动作用下的结构响应，并与单向地震动作用下的结构响应进行比较，得出了结构受单向地震动荷载作用时的响应都明显比三向地震动荷载作用小，特别是爆破地震动荷载主频越小时差值越大；对于各单向地震动荷载作用，当爆破地震动荷载主频较小（约小于基频的10倍）时，水平方向地震动荷载作用的结构响应明显比垂直方向地震动荷载作用时大，而在较高频率段，两者相差不大（垂直向略大）的结论。

Study on Effect of 3D Load Components of Blasting Vibration on Structural Dynamic Response

The effects of ground movements induced by blasting vibration on structures are multiple components.In the past,the study on structural response mainly focused on the effect of vertical ground movement,less considering the effect of multi-dimensional movements.In this paper,the structural response under multi-dimensional movements is discussed with time-order analysis,and comparing with that of single ground movement.The conclusions are that the response of structures enduring one dimensional excitable load is smaller than that of structures enduring 3D excitable loads,especially the smaller the main frequency of blasting vibration is,the larger difference of responses;for one dimensional excitable load,when main frequency of blasting vibration is smaller(10 times less than basic frequency),the responses of structures enduring horizontal load are clearly larger than that of structures enduring vertical load,however,the differences of responses between vertical and horizontal loads are not large at the higher frequency band.