期刊论文

Cao, G.-H.(cgfcivil@163.com)

中文

工程力学

1000-4750

2009

26

3

155-160+175

国家自然科学基金项目（50678063）； 湖南省自然科学基金项目（07JJ3100）；

本校为第一且通讯机构

以钢筋混凝土连续箱梁1006d的长期受力性能试验为基础,考虑混凝土收缩徐变和弹性支座不均匀沉降影响,采用徐变换算截面法分析了连续箱梁的结构内力重分布、截面应变应力重分布和长期挠曲变形,并与实测结果进行对比分析.研究表明:持续荷载作用引起受拉钢筋的应变增长相对较小,且跨中截面的拉应变增长较中间支座截面显著.持续荷载作用引起受压钢筋和受压混凝土的应变增长相对较大,且跨中截面的压应变增长较中间支座截面显著.持荷1006d边支座反力系数理论值较初始值增长7.0%,边支座反力系数实测值较初始值增长7.2%,理论值与实测结果吻合较好;连续箱粱结构内力重分布效应对其长期挠曲变形的影响较大...

This paper investigates the structure internal force redistribution, the sectional strain and stress redistribution and long-term flexural deformation of reinforced concrete continuous box girders. To do that, 1006 days' long-term behavior test is carried out, and concrete shrinkage, creep and uneven settlement of elastic supports are considered by means of creep transformed-section method. It is shown that: 1) The strain of tensile steel bars increases slightly, especially at the mid-support section; 2) The compressional strains of steel bars and concrete increase relatively larger under sust...