摘要
为了研究收缩徐变参数对超宽混凝土主梁斜拉桥的影响,根据工程实际建立全桥空间梁格模型,基于AEMM-FEM法和灰色关联度方法分析结构收缩徐变参数敏感性.结果表明:收缩徐变参数变化时超宽混凝土主梁负弯矩区的截面应力与弯矩变化沿横向分布不均,超宽主梁收缩徐变的空间效应显著.提高主梁混凝土加载龄期、抗压强度和环境相对湿度会引起跨中斜拉索应力松弛,同时加重梁端附近斜拉索的索力负担.由灰色关联度序列可知,主梁加载龄期是影响超宽主梁线形的最敏感因素.
In order to study the influence of shrinkage and creep parameters on the super wide concrete girder cable-stayed bridge, a spatial grillage model of the whole bridge was established according to the engineering practice. Based on AEMM-FEM method and gray correlation degree method, the sensitivity of shrinkage and creep parameters of the bridge was analyzed. Results show that the spatial effect of shrinkage and creep of the super wide girder is significant when the parameters of shrinkage and creep change because the variation of the section stress and moment of the negative moment area of the girder is unevenly distributed along the lateral direction. Increasing the loading age, compressive strength of the girder concrete and environmental relative humidity will lead to the stress relaxation of the mid-span stay cables. Due to the increase of these parameters, the tensile load of the stay cables near the beam end is aggravated. According to the gray correlation sequence, the loading age of the girder is the most sensitive factor affecting the line shape of the super wide girder.
作者
黄新
贾烊
李建慧
王涛
HUANG Xin;JIA Yang;LI Jianhui;WANG Tao(School of Civil Engineering, Nanjing Forestry University, Nanjing 210037, China;Nanjing Municipal Design and Research Institute Co., Ltd., Nanjing 210008, China)
出处
《西安建筑科技大学学报（自然科学版）》
北大核心
2019年第2期155-159,共5页
Journal of Xi'an University of Architecture & Technology(Natural Science Edition)
基金
江苏省高等院校自然基金(12KJB560003)
高等学校博士学科点专项科研基金(20133204120015)
关键词
斜拉桥
收缩徐变
参数敏感性
有限元法
灰色关联度
cable-stayed bridge
shrinkage and creep
sensitivity of parameters
finite element method
gray correlation degree
