摘要
通过能量变分法,提出了基于三个广义位移函数的波形钢腹板组合箱梁剪力滞效应微分方程和基于有限差分法的半解析半数值解法。分别以简支梁和连续梁为算例,采用有限元法进行验证性分析,并采用所提出的分析方法研究了几何参数对剪力滞效应的影响。结果表明:建议的理论计算公式的计算结果与有限元分析结果吻合较好;均布荷载作用下简支梁全长范围内基本表现为正剪力滞效应,而连续梁在边跨和中跨正弯矩区也呈现正剪力滞效应,且在反弯点附近连续梁翼缘有效宽度系数会出现奇异值;宽跨比是剪力滞效应的显著影响因素,宽跨比在0.234~1.000范围内变化时,其值越大,剪力滞效应越明显;宽高比在1.0~5.0范围内时,对剪力滞效应基本没有影响。
This paper proposed a semi-analytical method for the analysis of the shear-lag effect of composite box girder bridges with corrugated steel webs. This method is based on the governing differential equations of the shear-lag effect adopting three generalized displacement functions and the corresponding finite difference solving scheme. The proposed semi-analytical method was first verified by the comparison to finite element simulation results of a simply supported and a continuous test beam. The influencing parameters to the shear-lag effect were also studied with the proposed semi-analytical method. The research presented in this paper shows that the proposed semi-analytical method agrees well with finite element method. Positive shear-lag effect can be observed in most part of a simply supported beam under uniformly distributed load. The shear-lag effect in the positive moment segment of a continuous beam is also positive. Singular values of effective flange width coefficients are observed close to the contraflexure point. The width-to-span ratio is an important factor that influencing the shear-lag effect of composite box girders with corrugated steel webs.When the width-to-span ratio ranges from 0.234~1.000,the magnitude of the shear-lag effect enhances with the increase of the width-to-span ratio. On the contrary, the width-to-height ratio does not show great influence when it varies from 1 to 5.
作者
姜瑞娟
肖玉凤
吴启明
彭曼琳
徐添华
陈师节
JIANG Ruijuan;XIAO Yufeng;WU Qiming;PENG Manlin;XU Tianhua;CHEN Shijie(School of Civil Engineering,Shandong University,Jinan 250061,China;Shenzhen Municipal Design&Research Co.,Ltd,Shenzhen 518029,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2019年第S01期271-277,共7页
Journal of Building Structures
基金
国家自然科学基金项目(51578323).
关键词
波形钢腹板组合箱梁
剪力滞效应
翼缘有效宽度
能量变分法
composite box girders with corrugated steel webs
shear-lag effect
effective flange width
energy variation method
作者简介
姜瑞娟,出生于1973年,女,工学博士,教授级高级工程师,主要从事新型组合桥梁结构研究。E-mail:jiangrj@szmedi.com.cn;通信作者:吴启明,出生于1981年,男,工学硕士,高级工程师,主要从事新型组合桥梁结构研究。E-mail:wuqm@szmedi.com.cn
