摘要
目前各国桥梁设计规范普遍将船舶撞击力处理为等效静力,忽略了冲击荷载引起的结构动力效应,为建立更加合理的实用荷载模型,建立了5艘轮船的有限元模型,采用正撞刚性墙模型,通过数值仿真获得了45条不同撞击速度下的撞击力时程样本。提出采用修正半波正弦函数近似描述撞击力样本过程,通过数理统计确定了模型的实用参数。最后,以一座连续梁桥为例进行了接触碰撞反应分析与撞击力时程反应分析,并将修正半波正弦荷载模型的响应求解误差分为3类,分别讨论了3种误差对结构响应误差的贡献大小。算例分析结果表明,建立的轮船修正半波正弦荷载模型具有良好的求解精度,具有很好的工程实用价值。
The ship-bridge impact force in most current codes worldwide is taken as an equivalent static force to ignore dynamic effect between structures due to ship-bridge collisions.In order to establish a simplified impact load model as a better alternative of the equivalent static load,5 finite element models of ships were built.A ship rigid wall head-on collision model was used to simulate ship-bridge collision processes.45 impact force time history samples under different impact velocities were obtained through numerical simulation.A modified half-wave sine function model was proposed to approximately describe impact force sample processes and the model’s parameters were determined with statistical analysis.Finally,taking a continuous girder bridge as an example,the ship-bridge contact impact response analysis and the impact force time history analysis were conducted.The response-solving error of the modified half-wave sine load model was classified into three types.Then the contribution of each type error to the structural response error was estimated.The example results showed that the modified half-wave sine load model proposed here has a good solving accuracy and is valuable for practical application.
作者
宋彦臣
王君杰
尹海蛟
刘慧杰
SONG Yanchen;WANG Junjie;YIN Haijiao;LIU Huijie(College of Civil Engineering,Tongji University,Shanghai 200092,China;Qingdao Institute of Highway Planning and Design Co.,Ltd.,Qingdao 266100,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2019年第5期60-70,共11页
Journal of Vibration and Shock
基金
国家自然科学基金项目(51438010
51778498
51278373)
上海市科学技术委员会科研计划项目(17DZ1204300)
关键词
船-桥碰撞
轮船
动力效应
撞击力时程
简化荷载模型
ship-bridge collision
ship
dynamic effects
impact force time history
simplified impact load model
