爆炸荷载下钢筋混凝土框架毁伤效应的数值仿真

发布时间：2018-02-10 14:27

本文关键词： 爆炸荷载倒塌钢筋混凝土框架毁伤效应应力时程曲线　出处：《南京理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：该文采用数值仿真模拟方法研究了爆炸荷载下钢筋混凝土构件及框架结构的毁伤效应,得到了其破坏全过程和毁伤效应规律。该文的研究结果对爆炸后建筑结构的损伤评估具有一定的参考意义。该文研究内容及结论如下:(1)数值模拟了不同工况下混凝土柱在爆炸荷载下的毁伤效应,得到了不同炸药当量,不同爆源距离时混凝土柱的累积损伤图和高斯点的速度时程曲线,获得了毁伤程度与炸药当量、爆源距离之间的关系。(2)数值模拟了爆炸荷载作用下钢管混凝土柱的毁伤效应,得到了不同壁厚时混凝土单元和钢管单元的累积损伤图和高斯点的速度时程曲线,得到了壁厚与钢管混凝土毁伤程度的关系。(3)数值模拟了爆炸荷载作用下钢筋混凝土框架的毁伤效应,得到了不同位置爆源时框架上高斯点的应力时程曲线图,加速度时程曲线图,位移时程曲线图,得到了框架的损伤破坏过程以及爆炸冲击波的传播影响区域。(4)数值模拟了炸药当量对钢筋混凝土框架结构在爆炸荷载下的毁伤效应的影响,得到了同一高斯点在三种不同炸药当量下的应力时程曲线,加速度时程曲线,位移时程曲线和框架不同时刻的应力云图,获得了不同炸药当量下框架的破坏过程、区域和形态。(5)数值模拟了爆源距离对钢筋混凝土框架结构在爆炸荷载下的毁伤效应的影响,得到了同一高斯点在三种不同爆源距离下的应力时程曲线,加速度时程曲线,位移时程曲线和框架不同时刻的应力云图,获得了不同爆源距离下框架的破坏过程,区域和形态。
[Abstract]:In this paper, the damage effect of reinforced concrete members and frame structures under explosive loading is studied by numerical simulation method. The whole process of damage and the law of damage effect are obtained. The research results in this paper have some reference significance for the damage assessment of building structure after explosion. The contents and conclusions of this paper are as follows: numerical simulation of mixing under different working conditions. Damage effect of solidified soil column under explosion load, The cumulative damage diagram of concrete column with different explosive equivalent and different detonation source distance and the velocity time history curve of Gao Si point are obtained, and the damage degree and explosive equivalent are obtained. The damage effect of concrete-filled steel tubular column under explosion load is simulated numerically. The cumulative damage diagram of concrete element and steel tube element with different wall thickness and the velocity time-history curve of Gao Si point are obtained. The relationship between wall thickness and damage degree of concrete-filled steel tube (CFST) is obtained. The damage effect of reinforced concrete frame under explosion load is simulated numerically. Acceleration time history curve, displacement time history curve, The damage and failure process of the frame and the influence area of blast wave propagation are obtained. The numerical simulation of the effect of explosive equivalent on the damage effect of reinforced concrete frame structure under explosion load is carried out. The stress time history curve, acceleration time history curve, displacement time history curve and stress cloud diagram at different time of frame at the same Gao Si point under three kinds of explosive equivalent are obtained, and the failure process of frame under different explosive equivalent is obtained. Region and shape. 5) the effect of explosion source distance on damage effect of reinforced concrete frame structure under explosion load is simulated numerically. The stress time history curve and acceleration time history curve of the same Gao Si point under three different explosion source distances are obtained. The displacement time history curve and the stress cloud diagram of the frame at different times are used to obtain the failure process, region and shape of the frame under different explosion source distances.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375.4

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