摘要
为了更精确地求解波形钢腹板组合箱梁的挠度,通过分析该组合箱梁挠曲剪应力分布特点,结合虚功原理,推导出考虑全截面剪切影响的剪切形式因子.基于能量变分原理,推导出该组合箱梁剪切附加挠度的控制微分方程,并给出一般荷载条件下简支箱梁剪切附加挠度的表达式.数值算例结果表明,考虑剪切变形影响计算的组合箱梁挠度与ANSYS空间有限元计算结果及实测值吻合良好,剪切变形对组合箱梁的挠度影响较大.参数分析结果表明:随着宽高比的增大,采用剪切系数方法计算所得的组合箱梁附加挠度也增大;随着跨高比的增大,波形钢腹板剪切变形产生的附加挠度不断减小,当跨高比大于40时,可忽略腹板剪切变形的影响.
To solve the deflection of a composite box girder with corrugated steel webs more accurately, a shear form factor considering the full section shear effect was derived by analyzing the distribution characteristics of the flexural shear stress of the composite box girder and combing with virtual work principle. The control differential equation for the shear additional deflection of the composite box girder was derived based on the energy variation principle, and the expression of the shear additional deflection of the simple-support box girder under general loading conditions was given. The results of the numerical examples show that the deflection of the composite box girder considering the influence of the shear deformation is in good agreement with the calculation results of ANSYS space finite element and the measured values. The shear deformation has a great influence on the deflection of the composite box girder. The results of parametric analysis show that with the increase of the aspect ratio, the additional deflection of the composite box girder calculated by the shear coefficient method increases. With the increase of the span-depth ratio, the additional deflection caused by the shear deformation of the corrugated steel webs decreases. When the span-depth ratio is greater than 40, the influence of shear deformation of the webs can be neglected.
作者
李丽园
周茂定
冀伟
刘世忠
Li Liyuan;Zhou Maoding;Ji Wei;Liu Shizhong(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Department of Civil Engineering,Gansu Agricultural University,Lanzhou 730070,China)
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2019年第2期296-302,共7页
Journal of Southeast University：Natural Science Edition
基金
国家自然科学基金资助项目(51568036
51708269
51868039
51868040)
兰州交通大学青年科学基金资助项目(2017017)
关键词
波形钢腹板组合箱梁
剪切附加挠度
虚功原理
挠曲剪应力
剪切形式因子
composite box girder with corrugate steel webs
shear additional deflection
virtual work principle
flexural shear stress
shear form factor
