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选用了具有强大显式动力分析功能的ANSYA/LS-DYNA程序,并采用Solid164显式单元进行数值模拟.分析了在爆炸荷载作用下,2层钢框架在没有考虑混凝土楼板和有混凝土楼板参与时,梁、柱截面细微的动力响应和变化规律,试图找出其破坏的薄弱环节.分析发现:爆炸冲击荷载直接作用时间极其短暂,结构动力响应复杂,且成周期性变化;梁、柱相交节点区域应力最大,柱相关单元首先会进入塑性,且单元失效也先出现在该区域的柱上;当施工阶段无楼板参与时,梁单元基本处于弹性工作状态;有楼板参与作用时,梁单元于跨中和与柱相交的节点区域首先进入塑性,梁单元在竖向荷载设计值作用下,扭曲现象明显.
The ANSYA / LS-DYNA program with powerful explicit dynamic analysis function is selected and the explicit unit of Solid164 is used for numerical simulation.The effect of explosion load on the performance of two-story steel frame without considering the concrete floor and the concrete floor is involved , Beam and column cross-section subtle dynamic response and variation law, trying to find the weak links of its destruction.It is found that the direct impact time of explosion impact load is extremely short, the dynamic response of the structure is complicated and changes cyclically, and the intersection of beam and column The maximum stress in the region, the column-related elements will first enter the plasticity, and the failure of the elements will first appear in the column of the region; when no floor is involved in the construction phase, the beam elements are basically in a flexible working state; when the floor is involved, The midspan and node intersections enter the plastic first, and the distortion of the beam elements under the action of the vertical load design value is obvious.