CAJ | 학술논문

实际的桥梁结构并非位于真空环境下,随着斜拉桥跨径的增大,其几何变形与质量分布状态都会随着周围环境介质的变化而变化,从而影响到结构的动力特性.从桥梁结构动力特性平衡方程出发,综合考虑静风效应、温度效应及深水效应3种环境介质对动力特性方程中的{M}矩阵和{K}矩阵改变的影响,以在建的某大跨斜拉桥为工程背景,建立动力特性分析有限元模型,分析了该桥动力特性随周围环境介质影响的变化规律.分析研究表明:较高风速下,结构自振频率急剧降低,且伴随着强烈的振型耦合现象;水效应引起的附加质量矩阵使结构的自振频率略有降低;温度效应变化对结构自振频率影响不明显,分析时可以忽略不计.
실제적교량결구병비위우진공배경하,수착사랍교과경적증대,기궤하변형여질량분포상태도회수착주위배경개질적변화이변화,종이영향도결구적동력특성.종교량결구동력특성평형방정출발,종합고필정풍효응、온도효응급심수효응3충배경개질대동력특성방정중적{M}구진화{K}구진개변적영향,이재건적모대과사랍교위공정배경,건립동력특성분석유한원모형,분석료해교동력특성수주위배경개질영향적변화규률.분석연구표명:교고풍속하,결구자진빈솔급극강저,차반수착강렬적진형우합현상;수효응인기적부가질량구진사결구적자진빈솔략유강저;온도효응변화대결구자진빈솔영향불명현,분석시가이홀략불계.
The actual bridge structures are not situated in the vacuum environment, so the dynamical behavior of the bridge structure will be affected with the geometrical deformations and the mass distributions due to the variety of the ambient medium, especially along the augment of bridge span. Taking into the effect of the static wind, temperature and deep water account synthetically, the variety and influence of matrix {M} and matrix {K} with those three ambient mediums are analyzed by starting out with the dynamical behavior equilibrium equation. A dynamical finite element model of a cable-stayed bridge is built to research the rules between dynamical behavior of cable-stayed bridge and those ambient mediums. The results of calculation indicate that natural vibration frequency of bridge structure will reduce drastically and follow with oscillation mode coupling phenomenon in high wind velocity, the additional mass induced by water effect will reduce the natural vibration frequency appreciably, and the natural vibration frequency variety is not obvious by temperature effect and it can be ignored during analysis.