公路桥梁圆形混凝土偏心受拉构件裂缝计算方法探讨

Discussion on Calculation Method of Eccentric Tensile Member of Circular Concrete of Highway Bridge

目前,指导公路桥梁结构混凝土构件计算的规范主要有JTG 3362—2018《公路钢筋混凝土及预应力混凝土桥涵设计规范》及JTG 3363—2019《公路桥涵地基与基础设计规范》,而这2本规范均未对圆形偏心受拉构件裂缝给出相应的计算公式。论文基于此背景,提出一种等效计算方法,即利用JTG 3362—2018中的现有公式分别单独计算圆形截面受拉和受弯,然后线性叠加,并对比JTS 151—2011《水运工程混凝土结构设计规范》中计算公式,最终用于指导公路桥梁圆形混凝土偏心受弯构件裂缝计算。

At present,the main specifications for the calculation of concrete components of highway bridge structures are JTG 3362—2018 Specification for Design of Highway Reinforced Concrete and Prestressed Concrete Bridge and Culverts and JTG 3363—2019 Specifications for Design of Foundation of Highway Bridge and Culverts.In these two specifications,no corresponding calculation formula is given for the crack of the circular eccentric tensile member.Based on this background,an equivalent calculation method is proposed.That is using the existing formula in JTG 3362—2018 to calculate the tensile and bending of circular section separately,and then the linear superposition.By comparing the calculation formula of JTS 151—2011 Design Code for Concrete Structures of Port and Waterway Engineering,it is finally used to guide the calculation of cracks in eccentric flexural members of circular concrete of highway bridges.