基于实际工作状态的多跨悬索桥中间塔静力试验模型设计

与传统两塔悬索桥相比，多塔连跨悬索桥中间塔的约束条件、工作环境及荷载作用等均有较大差别，其对全桥安全性和使用性有显著影响。基于泰州大桥的实际工作状态（中间塔的纵向最不利工况），采用静力相似理论设计中间塔缩尺模型。通过对原桥中间塔和试验模型的数值仿真分析，从内力、位移及应变等方面比较分析原桥和试验模型的相似关系，结果表明，以几何尺寸和材料弹性模量为基本相似量所设计的试验模型，能满足中间塔主要静力性能的试验要求。

Model design of static experiment for the middle tower of multi span suspension bridge based on actual working conditions

Compared to the tower of common two span suspension bridges, the middle towers of multi span suspension bridges have several different characteristics, such as the constraints, service conditions and loads, etc, which affect the safety and applicability of the bridges. In this paper, a small scale model was designed for the middle tower of Taizhou Bridge, based on its actual working conditions. By the finite element method, the similarities between the experiment and the prototype were investigated from three aspects, including the internal forces, displacements and strains. It is demonstrated from the investigation that, with the geometric size and material modulus as the essential parameters, the designed model herein can satisfy the requirements of mechanical properties of experiment.