双塔双索面斜拉桥结构荷载效应分析

发布时间：2018-01-22 13:23

本文关键词： 双塔双索面斜拉桥荷载效应力学响应有限元分析变化规律　出处：《中外公路》2014年02期 　论文类型：期刊论文

【摘要】：以西南地区某大桥结构荷载效应分析为例,研究了双塔双索面斜拉桥结构在恒载、活载、温度荷载作用下,边跨1/2、中跨1/4、中跨1/2、中跨3/4截面处的位移、应力以及索力等参数的力学响应。研究结果表明:1)在恒载作用下,中跨1/2处挠度最大,主梁监测截面和索塔根部均处于受压状态,跨中截面附近出现最大压应力,达10.1MPa;2)在活载作用下,中跨1/2处竖向位移达最大值,而主塔监测截面应力位于-4~0.7MPa区间内;3)在温度荷载作用下,主梁监测截面在升温与降温两种情况下的竖向位移大小相等,挠度方向相反,应力基本呈对称分布,索力负值最大处为13#拉索处。
[Abstract]:Taking the structural load effect analysis of a bridge in southwest China as an example, this paper studies the side span of 1 / 2, middle span of 1 / 4, and middle span of 1/2 under dead load, live load and temperature load of a cable-stayed bridge with two towers and two cable planes. The mechanical responses of displacement, stress and cable force at the 3/4 cross section are obtained. The results show that the deflection of the middle span at 1/2 is the largest under dead load. The monitoring section of the main beam and the root of the cable tower are both under compression, and the maximum compressive stress appears near the mid-span section, reaching 10.1 MPA. 2) under the action of live load, the vertical displacement reaches the maximum at 1/2 middle span, and the stress of the main tower section is in the range of -4 ~ 0.7MPa; 3) under the action of temperature load, the vertical displacement of the main beam is equal in the case of heating and cooling, the deflection direction is opposite, the stress is basically symmetrical distribution, and the maximum negative value of cable force is 13 # cable.
【作者单位】：浙江省交通规划设计研究院;浙江交通职业技术学院;
【分类号】：U448.27
【正文快照】： 中国是桥梁大国,桥梁数量仍在不断增加,但随着交通荷载、外界地质以及极端气候的影响,大部分桥梁在未满设计年限就出现了不同程度的病害,直接影响桥梁的正常服役。如何保证桥梁的安全运营是现阶段桥梁研究中备受关注的问题。张开鹏等提出了正确监测桥梁损害程度对桥梁加固方式

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