间隙对拼组式浮桥静态响应的影响分析

为了减小浮桥在通载状态下的结构内力及浮桥拼组拆卸的方便,拼组式浮桥通常在设计的时候就在舟节之间留有一定的连接间隙.在以往的分析中大多忽略了这种间隙对浮桥变形和受力的影响,而简单地将浮桥简化为连续或者铰接梁体系进行数值或者解析求解,这种方法并不能准确地给出桥节之间连接间隙的存在及其大小对浮桥静态响应的影响.本文以拼组式浮桥的连接间隙为研究对象,建立全桥分析的三维有限元模型,并用非线性单元的组合对浮桥连接件的力学特性进行有限元模拟,通过计算与试验结果的比较,表明了本文方法的正确性;在此基础上本文研究了浮桥在静载荷作用下的位移响应及不同位置的连接件内力与连接件间隙之间的关系,为此类浮桥的设计提供了必要的参考,并为其后续的动力分析提供了必要的理论依据.

Effect of gaps on static response of a belt floating bridge

In order to reduce the structure stress and increase the operation convenience of a belt floating bridge,the bridge is often designed with gaps between different units.However,the influences of the gaps were often ignored in most previous studies and the bridge is often considered as a continuous or hinged beam structure system.It is obvious that the influences of the existence and the size of the gaps on the static response of the floating bridge cannot be exactly modeled.In this paper,the influence of the gap is studied.A 3D FE model of the floating bridge is built.The nonlinear property of the gap is modeled by the combination of two types nonlinear elements and the agreement of numerical results with the experimental results validated the method.Then the relationships between the gap size and the bridge's static displacement and connection forces are studied,which can provide a valuable suggestion for the design and the dynamic analysis of this type of bridges in the future.