爆破切口高度对钢筋混凝土烟囱爆破拆除效果的影响OA北大核心CSTPCD

In order to study the influence of blasting cut height on the blasting demolition outcomes of a 120 m-high reinforced concrete chimney,a comprehensive model was established using finite element software Ansys LS-DYNA.Five blasting cut height schemes of 2.5,3.0,3.5,4.0 m,and 4.5 m were numerically simulated,and the collapse morpholo-gy and motion time history curves of the structure at each cut height were compared and analyzed.It was also compared with engineering practice.A study was conducted on factors such as the collapse range,recoil distance,collapse speed,and forward impact distance of the cylinder under different blasting cut heights.Results show that a too small blasting cut height can lead to a larger forward impact distance of the cylinder.With the increase of blasting cut height,the range of collapse of the cylinder gradually decreases,but the downward impact distance of the cylinder also increases.Through comparative analysis,the optimal height of the blasting cut is determined to be 3.5 m.The actual collapse outcomes are basically con-sistent with the numerical simulation results,and the numerical simulation results are reliable.