异形独塔斜拉桥索力优化与桥塔局部分析

发布时间：2018-01-10 19:33

本文关键词：异形独塔斜拉桥索力优化与桥塔局部分析　出处：《西南交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：异形独塔斜拉桥拥有个性的造型,往往是一座城市的地标,在实现跨越的同时代表着城市的发展水平,近年来,越来越多的极具特色的异形独塔斜拉桥方案得到应用。视觉效果上,异形独塔斜拉桥让人印象深刻,而从结构受力上对设计者却是一种考验,如何平衡桥塔造型与结构受力是该类桥梁设计的关键。本文基于雅安大兴二桥初步设计资料,对混凝土异形独塔斜拉桥静力特性、合理成桥状态及异形桥塔局部受力进行了研究。首先利用nidas/civil有限元软件,建立了混凝土异形独塔斜拉桥全桥有限元模型,对其施工阶段和成桥阶段进行计算分析。成桥分析中研究了活载、温度作用以及收缩徐变效应对异形独塔斜拉桥的影响。基于独塔斜拉桥合理成桥状态的分步算法,结合ANSYS一阶优化技术,对该异形独塔斜拉桥合理成桥状态的确定进行了研究。首先建立ANSYS参数化优化模型,以最小弯曲应变能为目标函数,根据对桥梁每个部位关注程度的不同赋予不同的权重进行优化计算得到初步成桥状态,在该状态的基础上配置预应力筋得到新的成桥状态,再基于新状态以最小弯曲应变能偏差为目标函数进行二次优化,优化后得到最终的成桥状态。整个过程在原设计的基础上调整了预应力筋,进行了索力优化,得到了更合理的成桥状态。最后在最终成桥的基础上,建立桥塔局部实体模型,对异形桥塔局部受力进行计算分析。针对异形桥塔受力特点,选取桥塔横梁数量和横梁顶底板厚度作为设计参数,研究参数变化对异形桥塔受力的影响,优化桥塔构造。
[Abstract]:Has the personality of special-shaped cable-stayed bridge with single tower shape, is often a city landmark, at the same time across the city represents the level of development, in recent years, scheme of special-shaped cable-stayed bridge with single tower more and more distinctive application. The visual effect, special-shaped cable-stayed bridge with single tower and impressive however, from the structure of the force of the designer is a test, how to balance the tower shape and structure stress is key to the design of this kind of bridge. This paper preliminary design of Ya'an Daxing Bridge Based on concrete special-shaped cable-stayed bridge static characteristics, reasonable bridge state and shaped tower local stress were studied. Firstly, using nidas/civil finite element software to establish concrete special-shaped cable-stayed bridge with single tower and finite element model of the whole bridge, the construction stage and finished stage are analyzed. The bridge analysis of live load, temperature and charge The effect of shrinkage creep effect of special-shaped cable-stayed bridge with single tower. The reasonable bridge state step by step algorithm of single tower cable-stayed bridge based on ANSYS combined with first-order optimization technique, the special-shaped cable-stayed bridge with single tower were studied to determine the reasonable bridge state. Firstly, ANSYS parameter optimization model, with the small bend strain energy as the objective function, according to the degree of concern for each position of the bridge is different with different weights were optimized initial bridge state, based on the state of the configuration of prestressed tendons get into a new state of the bridge, and then based on the new state with minimum bending strain energy deviation of the objective function for the two time optimization, get the final state of the bridge after optimization. The whole process adjustment of the prestressed reinforcement on the basis of the original design of cable force optimization, the bridge state is more reasonable. Finally, in the final bridge on the basis of the establishment of the tower office The solid model is used to calculate and analyze the local force of the special-shaped bridge tower. According to the stress characteristics of the special shaped bridge tower, the number of bridge tower beam and the thickness of the roof and floor of the girder are selected as the design parameters, and the influence of the parameter changes on the stress of the special shaped bridge tower is studied, and the structure of the bridge tower is optimized.

【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.27

【引证文献】