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针对简支板桥桥面连续构造破坏失效的问题,以普通简支梁与两跨桥面连续的简支梁为研究对象,采用九自由度三轴空间车辆模型,建立了车桥耦合振动方程,对比研究了两种结构在不同车辆速度及桥面平整度下的动力响应历程及冲击系数,揭示了桥面连续构造的动力损伤机理。研究结果表明桥面连续的简支板梁桥主梁跨中截面的动力放大系数较普通的简支梁小4%,说明桥面连续构造有利于减小简支梁桥跨中的振动响应。桥面连续缝处的动力放大系数在C级桥面不平整度下其动力放大系数可达到2.0,比主梁跨中的动力放大系数增大了约87%,会使裂缝宽度继续增大,车桥耦合的振动是影响桥面连续构造破坏的一个重要因素。
Aiming at the failure failure of the continuous slab bridge deck under normal conditions, a simple three-axis space vehicle model with nine degrees of freedom was adopted to study the ordinary simply supported beams and the continuous simply supported beams with two bridge decks. , The dynamic response history and impact coefficient of two kinds of structures under different vehicle velocities and deck flatness are compared and the dynamic damage mechanism of continuous deck structure is revealed. The results show that the dynamic expansion coefficient of the mid-section of the girder with continuous girder bridge deck is 4% smaller than that of the ordinary girder, which shows that the continuous structure of the bridge deck can reduce the vibration response of the girder bridge. The dynamic amplification factor at the continuous deck of bridge deck can reach 2.0 under the C-deck irregularity, which is 87% more than the dynamic amplification factor of the main span, which will further increase the crack width, The vibration of the vehicle-bridge coupling is an important factor that affects the continuous structural failure of the deck.