摘要
车辆撞击桥墩的碰撞力受很多因素影响,现行桥梁规范中仅以恒定的静力进行设计,不能正确反映碰撞过程的动力效应以及桥墩与车辆的耦合作用影响,难以满足现代交通和基础设施高速发展的需求.为了考察桥梁结构参数对碰撞力峰值的影响及不同参数间相对重要性,在有限元软件LS-DYNA平台上,建立了车桥碰撞精细化数值模型,对桥梁下部结构遭受重型车辆碰撞过程进行数值仿真,分析了桥墩高度、混凝土抗压强度等级、箍筋间距、纵筋和箍筋的屈服强度、纵筋和箍筋配率等结构参数对碰撞力峰值的影响规律.
Vehicle-impacting force on the bridge piers depends on many factors. However, in the current bridge design scheme only a constant static force is specified as the design value for the anti-impact design, which is far from enough to correctly describe the dynamic effects in impacting nor to meet the growing demands of the rapid development of modem transportation and infrastructure constructure. In order to clarify the influence of each structural parameter on the heavy vehicle-bridge impacting, a refined FE vehicle-bridge model is built based on LS-DYNA software and a systematic parametrical study has been conducted for investigating various bridge parameters including pier high, concrete strength, stirrup spacing, stirrup and longitudinal rebar strength, stirrup and longitudinal rebar ratio. The combined effects as well as their relative importance on the impacting force have been discussed in details.
出处
《力学季刊》
CSCD
北大核心
2016年第2期337-344,共8页
Chinese Quarterly of Mechanics
基金
国家自然科学基金(51438010)
关键词
车桥碰撞
碰撞力
动力响应
参数分析
数值模拟
bridge-vehicle impact
impact force
dynamic response
parametric analysis
numerical simulation
