波形钢腹板混凝土组合箱梁纯扭性能全过程分析

发布时间：2019-04-10 08:55

【摘要】：为获得波形钢腹板混凝土组合箱梁在纯扭矩作用下全过程的扭矩-扭率曲线,基于混凝土开裂前后2个阶段,建立了组合箱梁纯扭性能全过程分析模型.针对混凝土开裂前阶段,考虑截面宽高比和波形钢腹板形状的影响,提出了组合箱梁弹性扭转刚度的修正公式,同时引入普通钢筋和预应力筋的影响,修正了组合箱梁开裂扭矩计算公式.对于混凝土开裂后阶段,针对RASTM T中混凝土已开裂和忽略混凝土拉应力的不合理假定,提出了考虑扭率计算值修正的组合箱梁纯扭转非线性分析方法.然后,利用C++语言编制了组合箱梁纯扭性能全过程分析计算程序.分析结果表明,模型计算值与试验值吻合良好.该模型可准确预测波形钢腹板混凝土组合箱梁纯扭转受力全过程的扭矩-扭率曲线.
[Abstract]:In order to obtain the torque-torsion curve of corrugated steel web concrete composite box girder under pure torque, based on the two stages before and after concrete cracking, the whole process analysis model of pure torsion performance of composite box girder is established. Considering the influence of the ratio of section width to height and the shape of corrugated steel webs in the pre-cracking stage of concrete, a modified formula for the elastic torsional stiffness of composite box girder is proposed, and the influence of ordinary steel bars and pre-stress bars is introduced at the same time. The formula for calculating the cracking torque of composite box girder is modified. For the post-cracking stage of concrete, considering the unreasonable assumption of concrete cracking and neglecting the tensile stress of concrete in RASTM T, a nonlinear analysis method of pure torsion of composite box girder considering the correction of torsion ratio calculation value is proposed. Then, the whole process analysis and calculation program of the pure torsional behavior of composite box girder is programmed with C language. The analysis results show that the calculated values of the model are in good agreement with the experimental values. The model can accurately predict the torque-torsion curve of concrete composite box girder with corrugated steel webs during the whole process of pure torsion.
【作者单位】：东南大学交通学院;休斯敦大学土木与环境工程系;
【基金】：国家自然科学基金资助项目(50078014) 中央高校基本科研业务费专项资金资助项目江苏省普通高校研究生科研创新计划资助项目(KYLX_0159)
【分类号】：U448.216

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