二次预应力混凝土组合梁优化设计研究  

Research on optimization design of twice pre-stressed concrete combination beam

作　　者：汤红华[1] 邓通发[1] 宁轲[1] 戴俊[1] 

机构地区：[1]江西理工大学建筑与测绘工程学院,江西赣州341000

出　　处：《四川建筑科学研究》2016年第3期7-11,共5页Sichuan Building Science

基　　金：江西省交通运输厅科技项目(2014Y0012);国家级大学生创新训练项目(GZG-12-08-25)

摘　　要：近年来,预应力混凝土超薄梁应用越来越广泛。为解决超薄梁引起的反拱过大、梁体开裂等问题,以常用中小跨径二次预应力组合结构简支梁为例,采用ANSYS有限元软件数值模拟的方法,对二次预应力组合结构中一期预制构件的长度、截面宽度及高度进行了优化设计,对一期和二期预应力钢筋的控制张拉力的分配比例进行了研究,并使用MATLAB软件进行了优化分析。结果表明,减小一期梁的高度,增加一期预应力筋配置比例,可以提高梁的极限承载力,减小梁的反拱度。In recent years,ultra thin beam of pre-stressed concrete has applied more and more widely. In order to solve the great inverted camber and beam body cracking problems in ultra thin beam,with commonly used medium and small span simple beam about twice prestressed combination structure as an example. This paper optimized for length of prefabricated parts,width and height of the section,with numerical simulation method using ANSYS finite element software,and had made a research on tension distribution ratio. It can be concluded that the ultimate bearing capacity of twice pre-stressed combination beam can be raised and the anti-camber of twice prestressed beams can be reduced by reducing the height of a precast beam and increasing the proportion of the prestressing tendons of precast beam.

关 键 词：二次预应力组合梁 优化设计 反拱度 承载力 

分 类 号：U448[建筑科学—桥梁与隧道工程]