| 冲击荷载作用下钢框架的动态响应分析 |
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| 引用本文： | 杨绵越,付朝江,陈洪均.冲击荷载作用下钢框架的动态响应分析[J].福建工程学院学报,2017,0(4):317-323. |
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| 作者姓名： | 杨绵越 付朝江 陈洪均 |
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| 作者单位： | 福建工程学院土木工程学院 |
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| 摘 要： | 在冲击荷载作用下，钢框架结构的动态响应是一个复杂的非线性过程。运用ANSYS/LS-DYNA建立了钢框架的三维模型，对冲击荷载作用下钢框架的动态响应和破坏形态进行研究。采取多点积分算法，有效避免沙漏问题，保证计算结果精确。以冲击块与钢框架的碰撞冲击为例，研究了冲击速度、冲击块质量、冲击位置等参数对钢框架在横向冲击作用下动力响应的影响，并分析冲击荷载下钢框架的破坏形态。结果表明:冲击块的质量、速度、冲击位置的增加都会不同程度地加剧钢框架的动态响应；在冲击作用下，高应变主要出现在被冲击柱子的冲击区域、柱脚处和梁柱节点处；冲击荷载下钢框架的破坏形态为整个框架发生侧移，受冲击柱在冲击处翼缘出现局部屈曲，受冲击区域的截面发生弯扭，未受冲击柱出现倾斜。
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| 关 键 词： | 冲击荷载 钢框架 多点积分 动态响应 破坏形态 |
Dynamic response analysis of steel frame subjected to impact load |
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| Yang Mianyue,Fu Chaojiang,Chen Hongjun.Dynamic response analysis of steel frame subjected to impact load[J].Journal of Fujian University of Technology,2017,0(4):317-323. |
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| Authors: | Yang Mianyue Fu Chaojiang Chen Hongjun |
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| Institution: | College of Civil Engineering, Fujian University of Technology |
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| Abstract: | The process of dynamic response for steel frame subjected to impulsive load is a complicated nonlinear problem. A three-dimensional model of the steel frame was established using ANSYS/LS-DYNA finite element analysis software. The dynamic response and failure modes of the steel frames under impact loading were studied. Multi-point integration algorithm was adopted to avoid hourglass problem effectively and to ensure accurate calculation results. Taking the collision of impact block and steel frame as an example, the effect of impact velocity, impact mass and impact position on the dynamic response of the steel frame were analysed, and the failure mode of the steel frame under impact was discussed. With the increase of impact mass, impact velocity and impact position, the dynamic response of the steel frame increases. High strain mainly occurs at the impact area, the bottom of the column and the beam column joints. The failure mode of the steel frame under the impact load is lateral displacement of the whole frame. Local buckling occurs at the flange of the impact column, bending-torsion takes place at the section of the impacted area, and tilting appears in the another column. |
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| Keywords: | impact load steel frame multi-point integration algorithm dynamic response failure mode |
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