贺街大桥主桥箱梁设计要点分析

Box-girder Design Elements Analysis for Main Bridge of Hejie Bridge

文章以贺街大桥为工程背景,建立平面杆系有限元模型,对大跨径预应力混凝土变截面箱梁中普遍存在的箱梁腹板斜裂缝、箱梁底板开裂、箱梁跨中下挠过大、梯度应力大等问题进行分析研究,并提出通过优化贺街大桥箱梁构造、钢束布置及普通钢筋设计,有效避免了相关问题的发生,为同类桥梁设计提供参考。

With Hejie Bridge as the engineering background,this article established the plane frame finite element model, analyzed and studied the popular problems such as inclined cracks of box-girder webs, box-girder floor cracking, large box-girder midspan deflection, and large gradient stress in large- span prestressed concrete variable-section box-girder,and proposed to effectively prevent the occur- rence of related problems by optimizing Hejie Bridge box-girder structure, rebar beam arrangement and general rebar design,thereby providing the reference for the design of similar bridges.