摘要
为研究不同因素对现浇箱梁落地支架屈曲敏感性的影响,以工程实例为背景建立空间模型,采用控制变量法,分别研究材料非线性、几何非线性、初始缺陷、安装偏差大小和初始应力大小五种因素对结构屈曲的影响。结果表明:几何非线性和初始缺陷对屈曲较不敏感;不考虑材料非线性的屈曲分析不足以反应结构真实屈曲;安装偏差超过50mm后对结构屈曲敏感影响较大,规范规定的限值较为合理;初始应力超过30%后对结构屈曲较为敏感,规范规定的平均初始应力考虑了安全因数,比较合理。
In order to study the sensitivity of nonlinear buckling for console supports of cast-in place box beam,material nonlinearity, geometric nonlinearity, initial imperfection, installation deviation size and initial stress are investigated respectively by using control variable method based on the background of the project. It shows that geometric nonlinearity and initial imperfection are insensitive factors. The analysis of neglectable material nonlinearity is not sufficient to reflect the true buckling condition. When installation deviation is more than 50 mm it has a great influence on buckling andthe limitation is reasonable;When initial stress is more than 30 the structure becomes sensitive to buckling. It is reasonable to consider the safety factor for the average initial stress written on the specification.
作者
赵鹏
ZHAO Peng(CCCC road&bridge construction Co.,Ltd.,Beijing 100012,China)
出处
《低温建筑技术》
2019年第11期48-52,共5页
Low Temperature Architecture Technology
关键词
现浇箱梁落地支架
非线性屈曲
初始缺陷
安装偏差
初始应力
console supports of cast-in place box beam
nonlinear buckling
initial imperfection
installation deviation
initial stress
