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斜拉桥桥面结构损伤位置识别的指标比较
引用本文:孙宗光,高赞明,倪一清,丁皓江.斜拉桥桥面结构损伤位置识别的指标比较[J].工程力学,2003,20(1):27-31.
作者姓名:孙宗光  高赞明  倪一清  丁皓江
作者单位:1. 沈阳建筑工程学院,沈阳,110015
2. 香港理工大学,香港
3. 浙江大学,杭州,310027
基金项目:香港特区RGC项目(Polyu 5052/99E),建设部科技攻关项目(02-2-1.2)
摘    要:以香港汲水门大桥为背景,应用高精度三维有限元模型,对斜拉桥桥面结构损伤位置识别的模态曲率指标、模态柔度指标和斜拉索张力指标进行了比较研究。主要比较了(1) 在无噪声情况下,三损伤指标对各种不同损伤情况的识别效果;(2) 三损伤指标对损伤程度的敏感性;(3) 三损伤指标的抗噪声能力。获得以下结论: (1) 曲率和柔度指标在损伤定位上对不同类型的损伤情况显现一定的互补性; (2) 同曲率和柔度指标比较,索张力指标对不同的损伤程度呈现较好的稳定性;(3) 对大多数损伤情况,柔度指标的抗噪性最好,曲率指标最差。

关 键 词:斜拉桥  损伤位置识别  模态曲率  模态柔度  斜拉索张力
文章编号:1000-4750(2003)01-027-05

COMPARATIVE STUDY OF DAMAGE LOCATING INDICES FOR CABLE-STAYED BRIDGES
SUN Zong-guang,GAO Zan-ming,NI Yi-qing,DING Hao-jiang.COMPARATIVE STUDY OF DAMAGE LOCATING INDICES FOR CABLE-STAYED BRIDGES[J].Engineering Mechanics,2003,20(1):27-31.
Authors:SUN Zong-guang  GAO Zan-ming  NI Yi-qing  DING Hao-jiang
Affiliation:SUN Zong-guang1,GAO Zan-ming2,NI Yi-qing2,DING Hao-jiang3
Abstract:This paper presents a comparative study of using the modal curvature index, the modal flexibility index and the cable tension index for damage localization in the cable-stayed Kap Shui Mun Bridge. Based on a precise and validated three-dimensional finite element model of the bridge, a series of damage cases associated with the deck are introduced in the simulation study. The simulation study is conducted with the following focuses: (i) performance comparison of the three indices in the absence of noise; (ii) sensitivity of three indices to damage extent; (iii) tolerance of the three indices to noise. The analysis results show that, for different damage types, modal curvature index and modal flexibility index are complementary to each other in damage indication. Comparatively, cable tension index is more stable than the other two indices to damage extent. For most damage cases, flexibility index is the best of the three indices in anti-noise and the curvature index is the worst.
Keywords:cable-stayed bridge  damage location identification  modal curvature  modal flexibility  cable tension  
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