考虑波纹钢腹板箱梁特点的挠度分析  

Deflection Analysis Considering the Characteristics of Box Girder with Corrugated Steel Webs

作　　者：刘保东[1] 任红伟[1,2] 李鹏飞[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044 [2]交通运输部公路科学研究院,北京100088

出　　处：《中国铁道科学》2011年第3期21-26,共6页China Railway Science

基　　金：国家自然科学基金资助项目(50878099);交通运输部西部交通科技项目(200831822367)

摘　　要：基于波纹钢腹板箱梁特点,利用变分原理法,推导考虑箱梁剪力滞和剪切变形影响的波纹钢腹板箱梁挠度计算公式。结合室内模型试验和有限元分析,对该公式的有效性进行验证,并分析各影响因素对波纹钢腹板箱梁挠度的影响程度。分析结果表明:该公式的计算结果与试验和有限元分析的结果具有较高的一致性,表明该公式可用于波纹钢腹板箱梁设计和施工中的挠度计算;剪力滞对正应力分布有影响,剪切变形对正应力分布没有影响;与初等梁理论的计算结果比较,剪力滞效应和剪切变形分别增大波纹钢腹板箱梁挠度1.3%和44.7%。因此在实际计算波纹钢腹板箱梁挠度时,不可忽略剪力滞和剪切变形的影响。Based on the characteristics of box girder with corrugated steel webs, using the variational prin- ciple method, the deflection formula of box girder with corrugated steel webs was deduced. The effects of shear lag and shear deformation on the box girder were considered in the deflection formula. Combined with the results of the indoor model test and the finite element analysis, the effectiveness of the formula was verified and the influence degree of each influencing factor on the deflection of box girder with corruga- ted steel webs was analyzed. The analysis results show that the deflection calculated by the theoretical for- mula has high consistency with the results of the test and the finite element analysis, which indicates that the formula can be used to calculate the deflection of box girder with corrugated steel webs in the design and construction. The shear lag has influence on the distribution of normal stress, but the shear deforma- tion has no influence on it. Compared with the results of general beam theory, the deflection value of box girder with corrugated steel webs can be increased by 1.3 % and 44.7when considering the shear lag effect and the shear deformation respectively. Hence, the shear lag and shear deformation can not be ig- nored when calculating the deflection of box girder with corrugated steel webs in the actual design.

关 键 词：箱梁 波纹钢腹板 挠度 变分原理法 剪力滞 剪切变形 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]