现浇空心板梁桥梁底纵向开裂分析与加固

现浇钢筋混凝土空心板梁桥在我国的桥梁建设中应用广泛,但是当宽跨比较大时容易出现梁底纵向开裂的问题。该文以空心板梁桥实际工程为研究背景,采用有限元软件Midas FEA,利用三维有限元方法对桥梁横向进行受力分析,得出结果为:宽跨比较大的空心板梁桥,其横向受力特征明显,在荷载作用下,板梁承受较大的横向弯矩。并根据裂缝的位置与成因提出了相应的加固措施与防治建议。

Analysis and Reinforcement of Longitudinal Crack at Girder Bottom of Cast-in-situ Hollow Plate Girder Bridge

The cast-in-situ steel reinforced concrete hollow plate girder bridge is widely used in the bridge construction of China,but the longitudinal crack easily appears at the girder bottom when the width span ratio is larger.Taking the practical projects of hollow plate girder bridge as the study background,the article uses the finite element software Midas FEA and the 3-dimension finite element method to analyzes the transverse stress of bridge,and gives the result that its transverse stress feature of hollow plate girder bridge is obvious when the width span ratio is larger.The larger transverse bending moment is put upon the plate girder under load.Based on the crack position and cause,the relative reinforcement measures and the preventive proposal are put forward.