【摘要】 为研究不同延时时差对框架-剪力墙拆除爆破的影响，采用ANSYS/LS-DYNA有限元软件，建立分离式共节点模型，通过对比工程实际与模拟结果，发现数值模拟结果可靠。在其他参数不变的情况下，仅对延时时差进行调整。设计9种不同的柱间时差方案，探讨其对爆堆高度和后坐距离的影响。研究结果表明：在延时时差0～0.2 s时，后排立柱来不及形成塑性铰，结构整体向后滑动；后排立柱在0.3～0.8 s时，在F排立柱形成塑性铰，塑性铰的位置随延时时差的增加而逐渐上移，导致后坐距离也逐渐增加；触地面积的大小会影响结构构件的碰撞和受力情况，进而决定建筑物在触地解体时的破碎状态延时时差；延时时差较小时，建筑物的破碎程度较轻，爆堆高度较高。延时时差增大时，结构会积攒更多的能量，建筑物的解体破碎程度提高，爆堆高度则降低。为减小后坐距离且保证结构能够定向倒塌，对于框架-剪力墙结构建筑物延时时差应该控制在0.3～0.4 s内。更多还原

【Abstract】 In order to study the influence of different delay time difference on the blasting demolition of frame-shear wall, ANSYS/LS-DYNA finite element software was used to establish a separate common node model. By comparing the engineering practice and simulation results, it was found that the numerical simulation results were reliable. In the case of other parameters unchanged, only the delay time difference is adjusted. Nine different inter-column time difference schemes were designed to explore their effects on the height of the blasting pile and the recoil distance. The results show that when the delay time difference is 0～ 0.2 s, the rear column has no time to form plastic hinge, and the whole structure slides backward. When the rear column is 0.3～ 0.8 s, the plastic hinge is formed in the F-row column, and the position of the plastic hinge gradually moves up with the increase of the delay time difference, resulting in the gradual increase of the recoil distance. The size of the touchdown area will affect the collision and stress of the structural members, and then determine the delay time difference of the broken state of the building when the touchdown disintegration; when the delay time difference is small, the building is less broken and the height of the blasting pile is higher. When the delay time difference increases, the structure will accumulate more energy, the degree of disintegration and fragmentation of the building will increase, and the height of the blasting pile will decrease. In order to reduce the recoil distance and ensure the directional collapse of the structure, the delay time difference of the frame-shear wall structure should be controlled within 0.3～ 0.4 s.更多还原