摘要
针对桥梁船撞设计规范中所用等效静力法忽略船桥碰撞动力本质及有限元数值模拟方法要求高、计算量大等缺点,借鉴地震反应谱概念提出船撞设计冲击谱方法。用有限元模拟不同吨位船舶在不同速度下撞击刚性墙,获得81条撞击力时程。计算不同周期、不同阻尼比单自由度体系在撞击力时程作用下位移放大系数。通过寻找位移放大系数统计规律,给出用于桥梁船撞工程设计冲击谱及具体使用步骤。
An equivalent static method is employed in most codes and specifications for vessel collision design of bridges,in which the dynamic nature of vessel-bridge collision is ignored.Higher requirements to the researchers and heavy calculation are required for the finite element numerical simulation method.Compared to the shortcomings of the above methods,with reference to the concept of the earthquake response spectrum,a design impact spectrum method was proposed.Through numerical simulations of the ship-rigid wall collision,81 sections of impact force time histories associated with different cases were obtained.The displacement amplification factor of a single-degree-of-freedom（SDF） system with different periods and damping ratios were calculated under the excitation of impact force time histories.Then a design impact spectrum of vessel-bridge collision was obtained by finding the statistical regularity of the displacement amplification factor.Finally the application steps of the design impact spectrum were provided.
出处
《振动与冲击》
EI
CSCD
北大核心
2014年第14期11-14,共4页
Journal of Vibration and Shock
基金
交通部西部交通建设科技项目(200731882234)
交通部交通行业联合科技攻关项目(2008353344340)
国家自然科学基金项目(51278373)
关键词
船桥碰撞
撞击力时程
设计冲击谱
vessel-bridge collision
impact force time histories
design impact spectrum
