普通国省干道危桥改造桥梁斜裂缝加固分析  

作　　者：李洪明 

机构地区：[1]保山公路局,云南保山678000

出　　处：《科技创新与应用》2021年第19期116-118,共3页Technology Innovation and Application

摘　　要：普通国省干道承担着十分重要的交通保障任务,运行中超载现象十分普遍,现役桥梁时常处于超负荷运营状态。随着桥梁运行寿命的增长,桥梁桥台背不均匀沉降、伸缩缝老旧损坏变形、桥面运行过程中造成的平整度下降等因素,会加剧因跳车产生的冲击荷载,使得既有桥梁支座附近因主拉应力增大,继而引发梁板侧向斜裂缝的产生,造成梁板承载力显著下降,危及桥梁运行安全。根据近年来保山公路局所管养的部分桥梁检测资料,结合我局已完成的类似危旧桥加固改造实践,现对危桥改造中梁板端头斜裂缝产生的成因、处治方法以及预防对策做简要分析。The general provincial trunk road undertakes a vital task of traffic guarantee,and the phenomenon of overloading in operation is rather common.Bridges in service are often in a state of overload operation.With the increase of bridge service life,factors such as uneven settlement of the back of bridge abutment,old damage and deformation of expansion joints,and the decrease of flatness caused by bridge deck operation will aggravate the impact load caused by vehicle jumping.Due to the increase of the main tensile stress near the bearing of the existing bridge,the lateral oblique crack of the beam plate is caused,which results in a significant decrease in the bearing capacity of the beam plate and endangers the safety of the bridge operation.According to the inspection data of some bridges managed and maintained by Baoshan Highway Bureau in recent years,as well as the reinforcement and reconstruction practice of similar dangerous old bridges completed by our bureau,this paper makes a brief analysis on the causes,treatment methods and preventive countermeasures of the oblique cracks at the end of the beam and slab in the reconstruction of the dangerous bridge.

关 键 词：预应力混凝土空心板 主拉应力 斜裂缝 弯矩调幅 

分 类 号：U445.6[建筑科学—桥梁与隧道工程]