摘要
为了对钢管混凝土提篮拱桥的损伤识别和诊断,建立了单圆管拱肋的空间有限元模型,并进行动力特性分析,利用空间曲线曲率模态差法对拱肋不同位置和不同程度的损伤工况进行识别和诊断。以一个钢管混凝土提篮拱桥作为算例,利用有限个测点和低阶振型对钢管混凝土拱肋不同位置和不同程度的损伤进行识别和诊断。研究结果表明:考虑空间效应的曲率模态差是提篮式拱桥拱肋损伤识别的有效方法,能准确识别多处损伤的情况;利用空间曲线曲率模态差法在桥梁现场布置若干测点测量的各振型位移模态能达到损伤诊断的目的;提出用空间曲线曲率模态差的变化方程对拱肋的损伤程度进行识别和诊断,适合用在钢管混凝土拱桥的健康监测系统中;空间曲线曲率模态差法通过位移自由度的退化,适合对平行拱和连续梁桥进行损伤识别和评估,具有通用性。
In order to detect the damage of concrete-filled steel tube basket handle arch bridges, a finite element spatial model of a concrete-filled steel tube basket handle arch bridge was built and its natural vibration characteristics were analyzed. arch-ribs were detected by the modal curvature Damage of different degrees and different sites of difference method of spatial curve. Taking a concrete-filled steel tube basket handle arch as an example for investigation, it was known that the method could detect accurately the damage of different sites and degrees, which only needs limit measuring points and low order shape modes. The results indicated that the modal curvature difference method of spatial curve was an effective damage detection method for concrete-filled steel tube arch ribs, which could detect damage of different degrees and multi-sites. The damage of bridge can be detected by the displacement mode that is measured by the measuring points located on the bridge. The damage degrees of arch ribs can be detected by the equation of differences of the modal curvature difference method of spatial curve and the method can be used in a health monitoring system. The method can be used in damage detection and assessment of parallel arch bridges and continuous bridges by freedom degeneracy.
出处
《广西大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第1期96-100,共5页
Journal of Guangxi University（Natural Science Edition）
基金
广西科学研究与技术开发计划项目(桂科攻0816006-7)
关键词
钢管混凝土
拱桥
损伤识别
空间曲线
曲率模态差法
concrete-filled steel tube
arch bridge
damage identification
spatial curve
differences of curvature modal method
作者简介
通讯联系人：谢开仲（1974-），男，广东连平人，广西大学副教授，同济大学博士后；E-mail：xiekaizhong@163．com。
