基于静态损伤识别法的简支箱梁桥损伤定位研究  

Analyses of Simply Supported Box Girder Bridge Damage Location by the Static Damage Identification Method

作　　者：张珂苑 卢瑞 韩淋臣 Zhang Keyuan;Lu Rui;Han Linchen(ShaanXi Railway Institute,Weinan 714000,China;The 2nd Engineering Co.,Ltd of China Railway 21st Bureau Group,Lanzhou 730000,China;The Highway Development Center of Gansu Province,Lanzhou 730000,China)

机构地区：[1]陕西铁路工程职业技术学院,陕西渭南714000 [2]中铁二十一局集团第二工程有限公司,甘肃兰州730000 [3]甘肃省公路事业发展中心,甘肃兰州730000

出　　处：《科学技术创新》2022年第7期89-92,共4页Scientific and Technological Innovation

基　　金：陕西铁路工程职业技术学院2019年第三批科研基金项目(KY2019-73)。

摘　　要：为了研究初始抗弯刚度不确定的简支箱梁损伤定位,利用基于位移影响线二次差值提出的跨中位移影响线差值指标(γ),考虑箱梁的结构特点和损伤特点,通过测量损伤前后移动荷载作用下的主梁跨中挠度即可基于跨中位移影响线差值指标建立损伤定位方法。研究结果表明:如果某一点(x_(1+m))和其相邻两点连线的斜率都发生了变化,则损伤长度小于等于区间长度m,损伤出现在区间[x_(1),x_(1+m)]或其对称区间[l-x_(1-m),l-x_(1)]。对于箱梁独特的截面特点,当损伤出现在不同位置均可通过分析损伤前后的γ数据点图进行损伤定位,但不能判断损伤的具体大小和位置。In order to study the flexural stiffness uncertainty of the damage location of simply supported box. Use the basic of the second order difference displacement influence line put forward to the difference index of influence line for mid-span displacement(γ).In view of the structure characteristic and the damage characteristic of box,by measuring the moving loads before and after damage of main girder in the mid-span deflection can be based on the cross displacement influence line difference index damage location method is established. The results showed thatdamage length less than or equal to the interval lengthm,if the slope of one point(x_(1+m))and the adjacent two point attachment has changed,it can be known that the damage occurs within the region[x_(1),x_(1+m)]or[l-x_(1-m),l-x_(1)]. For the unique characteristics of cross section box girder,When damage occurs in a different position can be detected by analyzing two γ graphs before and after damage location, but the size and location of the damage is not estimated.

关 键 词：简支梁桥 损伤定位 抗弯刚度 不确定性 跨中挠度 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]