CAJ | 학술논문

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.
위료대강관혼응토제람공교적손상식별화진단,건립료단원관공륵적공간유한원모형,병진행동력특성분석,이용공간곡선곡솔모태차법대공륵불동위치화불동정도적손상공황진행식별화진단.이일개강관혼응토제람공교작위산례,이용유한개측점화저계진형대강관혼응토공륵불동위치화불동정도적손상진행식별화진단.연구결과표명:고필공간효응적곡솔모태차시제람식공교공륵손상식별적유효방법,능준학식별다처손상적정황;이용공간곡선곡솔모태차법재교량현장포치약간측점측량적각진형위이모태능체도손상진단적목적;제출용공간곡선곡솔모태차적변화방정대공륵적손상정도진행식별화진단,괄합용재강관혼응토공교적건강감측계통중;공간곡선곡솔모태차법통과위이자유도적퇴화,괄합대평행공화련속량교진행손상식별화평고,구유통용성.
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. Damage of different degrees and different sites of arch-ribs were detected by the modal curvature difference method of spatial curve. Taking a con-crete-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 differ-ence 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 sys-tem. The method can be used in damage detection and assessment of parallel arch bridges and con-tinuous bridges by freedom degeneracy.