某既有钢筋混凝土预应力桥梁承载能力评定研究  

Research on the Evaluation of Bearing Capacity of an Existing Reinforced Concrete Prestressed Bridge

作　　者：吴秀娟 WU Xiujuan(Guangdong Provincial Highway Engineering Quality Monitoring Center,Guangzhou 510500,Guangdong,China)

机构地区：[1]广东省公路工程质量监测中心,广东广州510500

出　　处：《工程技术研究》2023年第23期14-16,共3页Engineering and Technological Research

摘　　要：为保证桥梁健康运营,确保运营桥梁的结构安全性,桥梁除外观检查外,还须通过荷载试验进行既有桥梁的承载能力评定。文章以某座既有小箱梁钢筋混凝土桥梁荷载试验为基础,在不同荷载工况条件下计算桥梁承载能力极限状态跨中抗弯承载力、斜截面抗剪能力,以及基于检测结果的结构实际板梁混凝土强度低于设计值、钢筋截面有折减时的承载能力,为类似既有桥梁承载能力评定提供参考依据。In order to ensure the healthy operation of the bridge and the structural safety of the operating bridge,in addition to appearance detection,the bearing capacity of the existing bridge must also be evaluated by the load test.Based on the load test of an existing small box girder reinforced concrete bridge,this paper calculates the midspan anti-bending capacity and inclined section shear resistance capacity of the bridge under the ultimate state of bearing capacity under different load conditions,as well as the bearing capacity when the actual concrete strength of the plate girder of the structure is lower than the design value and the steel bar section is reduced based on the detection results,which provides a reference for the evaluation of the bearing capacity of similar existing bridges.

关 键 词：承载能力评定 小箱梁桥 抗弯承载力 荷载试验 斜截面抗剪能力 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]