为了研究大跨径钢桥面沥青铺装的疲劳开裂,探讨不同钢桥面与铺装层的工作状态对铺装层受力的影响,采用有限元分析方法及断裂力学,分别建立钢板和铺装层各自完好或含有裂缝等4种不同状态下的三维有限元模型,计算分析了正交异性钢板和沥青铺装层不同工作状态下的沥青铺装层受力.分析表明:桥面铺装最不利荷位是纵向位于两横隔板中心处,横向单轮荷载中心作用在加劲肋开口中心的铺装层表面处;铺装层受到的横桥向应力与应变均大于纵桥向,最大横向拉应力与应变均出现在铺装层的上表面;钢桥板面开裂后,无论铺装层是否开裂,铺装层的纵向最大拉应力与应变都明显增大,钢桥面板的疲劳开裂会使桥面铺装层的受力状况受到恶化,并且会导致横向裂缝的产生与发展.%In order to study the crack of long-span steel bridge asphalt pavement, to explore the effect of different steel deck and pavement working conditions, using finite element analysis method and fracture mechanics, steel plate and pavement were established respectively containing intact or cracks under four different states of the three-dimensional finite element model. The stress of the asphalt pavement under different working conditions of the orthotropic steel plate and the asphalt pavement was calculated and analyzed. The analysis showed that the most unfavorable position of deck pavement was located at the center of the two diaphragms, and the transverse single wheel load center acts on the pavement surface of the opening center of the stiffener. The transverse stress and strain of the pavement were both greater than the longitudinal direction, and the maximum transverse tensile stress and strain appear on the upper surface of the pavement. After cracking of the steel bridge deck, no matter whether the pavement was cracked, the maximum tensile stress and strain in the longitudinal direction of pavement were obviously increased. The fatigue cracking of steel bridge deck will worsen the stress condition of the deck pavement and lead to the generation and development of transverse cracks.
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