曲线连续梁桥侧向失稳破坏机理与行为分析

Lateral Slippage Mechanism and Behavior of Curved Bridge Deck

就某曲线连续梁桥的曲梁整体侧移破坏现象,在受力、变形和破坏主导因素分析的基础上,阐述了温度荷载作用下曲梁整体侧移的破坏机理、破坏过程和破坏后行为。随着温度荷载的增加,跨间桥墩对曲梁的约束作用很小,而两端支座反力迅速增加,端部没有足够的约束强度,端部约束将遭到破坏,最终导致曲梁整体丧失稳定性,发生向外的整体滑动。利用能量原理对定量描述曲线梁破坏后的力学行为进行了初步探讨。

The authors studied the mechanism, process and cause of damege for a curved continuous bridge in Shenzhen. Unstable displacement of the curved continuous bridge occured after operation for two years. With temperature growth, the reactions at two ends of the curved beam increase rapidly. The support system at ends is damaged because of their weakness in strength. At the result, the curved beam losses its stability and slides outside. The behavior of the beam after slippage is discussed based on energy principle.