【摘要】 针对矿山爆破振动对邻近建筑结构的影响,对现场的爆破振动进行了监测,运用动力有限元法建立了包括确定爆破激振力的作用位置、大小和时程特征等爆破加载模型。采用ANSYS/LS-DYNA软件分别将爆破振动波输入建筑结构模型进行数值计算,通过建筑结构在爆破载荷作用下的结构自振周期随阶数变化和加速度、速度和位移时程曲线及各楼层测点的加速度放大系数的变化,分析了某矿办公楼对爆破振动的动力响应情况。研究结果表明:在模态4阶之前自振周期下降较快,5、6阶比较平稳,7阶后自振周期缓慢变小并趋于平稳,且模型的高阶振型出现扭转效应。随着楼层增加框架结构对矿山爆破振动响应的加速度增大的趋势。更多还原

【Abstract】 In view of the influence of mine blasting on the surrounding villages buildings,blasting vibration at the site was monitored,the blasting load model was established by applying the method of dynamic finite element method,including the exciting force of blasting vibration force location,size,and time-history features.Blasting vibration wave was loaded to the structure model for numerical calculation by using ANSYS/LS-DYNA software,the dynamic response of a mine office building under blasting loading conditions was analyzed through the variation of the structural self vibration period of the structure under the blasting load,and variations of the acceleration,velocity and displacement time-history curve and the acceleration magnification coefficients number of each floor measure point.The results indicated the self-oscillation period dropped rapidly before the 4 th order of the mode,and the 5 th and 6 th steps were relatively stable,after the 7 th order,the natural vibration period slowly became smaller and tended to be stable,and the high-order mode of the model had a torsional effect.In addition to the two-layer outer frame structure,the degree of amplification of mine blasting acceleration tended to increase with the floor.更多还原