柔性吊杆拱桥拱座安全性病害特征及影响分析  

Analysis on Safety Hazard Characteristic and Influence of Arch Seat in Flexible Suspender Arch Bridge

作　　者：曾祥春 Zeng Xiangchun

机构地区：[1]赣州城市投资控股集团有限责任公司

出　　处：《城市道桥与防洪》2019年第9期115-118,M0012,M0013,共6页Urban Roads Bridges & Flood Control

摘　　要：以柔性吊杆拱桥混凝土拱座为研究对象,结合理论预测以及现场检测与反馈分析,重点探讨了柔性吊杆拱桥拱座的安全性病害特征,并着重研究此类病害对拱座结构安全的影响。结果表明:拱座位移、开裂是拱座结构的主要退化风险。拱座位移主要表现为水平向外位移和竖向向下位移,一般导致拱圈刚度和承载力下降,相对而言,水平位移比竖向位移影响更明显;拱座开裂主要表现为弯剪效应产生的顶面横向裂缝、弯剪和轴力效应共同产生的拱圈出口处放射型裂缝以及轴力效应产生的拱座侧面竖向、斜向裂缝,一般而言,由弯剪效应产生的拱座裂缝危害更严重,因此,拱座顶面横向裂缝和拱圈附近的放射型裂缝对拱座安全性影响更大,在拱桥检测中应加以重视。Taking the concrete arch seat of flexible suspender arch bridge as a study object, and combined with the theoretical prediction, field test and feedback analysis, this paper discusses the safety hazard characteristics of arch seat in flexible suspender arch bridge and studies the influence of this hazard on the safety of arch seat in detail. The result shows that the displacement and cracking of arch seat are the maindegeneration risk of arch seat. The displacements of arch seat are mainly the horizontal outward displacement and vertical downward displacement, which will generally lead to the reduction of the rigidity and bearing capacity of arch ring. Comparatively speaking, the effect of horizontal displacement is more obvious than that of vertical displacement. The cracking of arch seat is mainly the transverse crack at the top caused by bending shear effect, the radial crack at the outlet of arch ring caused jointly by bending shear and axial force effect, and the side vertical and diagonal cracks of arch seat caused by axial force effect. Generally speaking,the crack hazard of arch seat caused by bending shear effect is more serious. Therefore, the transverse crack at the top of arch seat and the radial crack near arch ring have the greater effect on the safety of arch seat,and the attention should be paid in the detection of arch bridge.

关 键 词：拱桥 安全性 病害特征 拱座位移 拱座开裂 

分 类 号：U448.22[建筑科学—桥梁与隧道工程]