体外预应力+钢桁架横隔梁+粘贴钢板加固开裂桥梁力学性能研究  

Study on Mechanical Properties of Cracking Bridge Reinforced by External Prestress + Steel Truss Cross Member + Bonding Steel Plate

作　　者：陈栋栋 CHEN Dong-dong(Shanxi Transportation Construction Engineering Quality Detection Center(Co.,Ltd.),Taiyuan,Shanxi 030032,China)

机构地区：[1]山西省交通建设工程质量检测中心(有限公司),山西太原030032

出　　处：《山西交通科技》2022年第2期69-72,共4页Shanxi Science & Technology of Transportation

摘　　要：针对某25 m跨径先简支后连续预应力混凝土小箱梁桥(主梁底板、腹板出现裂缝病害,抗弯承载力不足)经采用体外预应力+钢桁架横隔梁+粘贴钢板组合加固方法加固后,通过试验跨小箱梁各控制断面应力、纵横向挠度及基频加固前后测试对比,研究该加固方法的有效性,结果表明该组合方法对桥梁的承载力和使用性能均有所改善,但仍无法使桥梁达到未损伤前的受力状态,并满足设计要求。Reinforcing a 25-meter-span simply-supported continuous prestressed concrete small box girder bridge which has cracks on the bottom plate and the web of the main girder and insufficient flexural capacity with the composite reinforcement of the external prestress + steel truss cross member + bonding steel plate.The effectiveness of the reinforcement was studied by testing and comparing the stress, longitudinal and lateral deflection and fundamental frequency before and after the reinforcement of each control section of the tested span small box girder. The results showed that, the composite reinforcement can improve the bearing capacity and performance of the bridge, however it still cannot make the bridge reach the stress state before damages or meet the design requirements.

关 键 词：体外预应力+钢桁架横隔梁+粘贴钢板 桥梁加固 荷载试验 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]