冲击载荷作用下单层球面网壳结构的破坏和温度效应

Damage and temperature effect of single-layer spherical reticulated dome under impact load

基于材料的损伤和失效准则,考虑重物冲击和受火温度对钢材性能的影响,运用有限元软件Abaqus分析K8型单层球面网壳在不同温度范围受到冲击载荷时的失效模式。对693个网壳算例进行分析,根据网壳的竖向变形和塑性发展情况,总结K8型单层球面网壳在冲击载荷作用下的6种破坏类型和失效模式分布。研究结果表明:温度对网壳结构在冲击作用下的稳定性有较大影响;在冲击物质量和速度一定的前提下,当火灾温度达到某个限值时,网壳出现整体倒塌破坏;当火灾温度达到400℃时,结构的抗冲击能力明显降低;随着冲击物质量和速度的增加,网壳变形模式不再随着温度的升高发生明显变化,此时网壳失效类型以剪切破坏为主。

Based on the damage and failure criteria of the material,the failure modes of K8 single-layer reticulated dome subjected to impact load at different temperature are analyzed by finite element software Abaqus,in which the influence of heavy impact and fire temperature on steel properties is considered.The 693 cases are analyzed,and the vertical deformation and plastic development of the reticulated dome are analyzed,and then the 6 failure types and the failure mode distributions of the K8 single-layer reticulated dome under impact loadings are summarized.The results show that:the temperature has a great influence on the stability of reticulated dome under impact;under the premise of a certain impact mass and velocity of the impact object,the reticulated dome collapses while the fire temperature reaches a certain limit;the impact resistance of the structure decreases obviously while the fire temperature reaches 400℃;with the increase of the impact mass and velocity,the deformation mode of reticulated dome no longer evidently changes with the increase of temperature,and the failure type of the reticulated dome is mainly shear failure.