【摘要】 研究撞击荷载作用下部支承结构对上部网壳结构工作性能的影响是网壳结构抗撞防灾分析的重要问题。利用非线性有限单元法和动力时程分析理论,建立重型车辆侧向撞击作用下钢柱支承结构与单层球面网壳整体动力响应分析数值模型。考察了下部支承钢柱和上部网壳结构在撞击荷载作用下的整体动力响应过程及特点,分析了支承钢柱抗侧刚度、撞击荷载峰值和撞击点数等因素对整体结构在撞击荷载作用下的协同受力和空间工作性能的影响。研究结果表明:除与被撞击钢柱及其相临网壳杆件发生塑性变形外,结构整体基本处于弹性状态,未发生动力失稳现象,其强度和稳定性要求在整体上仍均能满足要求,说明在重型车辆撞击作用下支承结构与上部网壳结构具有良好的抗撞击性能和整体工作性能。更多还原

【Abstract】 The influence of the lower support structure on the working performance of the upper reticulated shell structure is a critical issue in the analysis of anti-impact and anti-disaster of reticulated shell.Using the method of nonlinear finite element and the theory of elastoplastic dynamic response analysis,the numerical analysis model for single-layer Kiewitt-8 reticulated shell with lower supporting under heavy vehicle lateral impact action was established.Global dynamic response process and features of the reticulated shell under impact load were investigated.The influence of lateral stiffness of steel columns,peak of impact load and number of impact point on the cooperative force and space performance of the whole structure under the impact load were analyzed.The calculation results showed that the whole structure is basically in elastic state in addition to the plastic deformation for the impacted steel columns and members of their neighboring reticulated shell.There is no dynamic instability phenomenon,and the strength and stability of structure are still able to meet the requirements in the whole.The result indicated that the supporting structure and the upper reticulated shell struc-ture have good anti-impact performance and overall work performance under the impact of heavy vehicle.更多还原