摘要
根据荷载横向分布将空心板桥简化为单板,依据虚功原理推导了考虑荷载横向传递的简支梁上任意截面的挠度影响线、对称挠度差影响线及其曲率的解析表达式.由解析解可知,集中荷载位于无损区域和损伤区域时,挠度差值与荷载位置分别呈二次方和四次方关系;损伤区域和与其相对称的区域的挠度差值曲线的曲率与荷载位置呈二次方关系,其余区域的挠度差值曲线的曲率是常量,因而挠度差值曲线及其曲率曲线上存在拐点且拐点与无损区域和损伤区域的界线相对应.基于此,提出了基于挠度差影响线及其曲率的空心板局部损伤快速识别方法和应用模式.该方法仅需一辆机动车移动加载和一个挠度测点,即可对空心板的局部损伤进行识别.
The precast prestressed concrete hollow-slab bridge was simplified as a single slab based on the method of load transverse distribution, and the analytical expressions of deflection influence line, symmetrical deflection differential influence line and its curvature of any section of the simply-supported beam were deduced based on the virtual work principle. The analytical solutions show that when the concentrated load acts on the zone, the deflection differential is quadratic and biquadrate the curvature of differential curve of deflection between damaged zone and the undamaged respectively with the load position, damaged zone and its symytrical zone is quadratic with the load position while those of other zones are constant. Therefore, the inflection points appear on the deflection differential curve and its curvature curve, and correspond to the boundary between the damaged zone and the undamaged zone. Based on above analysis, the method and application model were proposed for fast identifying the local damage of hollow-slab bridge, by which only one motor v^hicle w.as used for moving loading and a gauge for measuring the deflection.
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2014年第2期283-293,共11页
Journal of Basic Science and Engineering
基金
华北水利水电大学高层次人才科研启动项目(201250)
生态建筑材料与结构工程河南省高校科技创新团队支持计划(13IRTSTHN002)
关键词
空心板桥
上部结构
挠度影响线
曲率
损伤识别
hollow-slab bridge
superstructure
influence line of deflection
curvature
damageidentification
