为研究冲刷与动水压力耦合作用下桥墩结构体系屈曲荷载及影响因素,采用能量法推导冲刷作用下桥墩结构体系的屈曲荷载计算公式,与等效单柱模型及有限元法进行对比验证,并利用能量法公式分析了墩长、桩根数、土质类型、桩长等因素的影响.结果表明,冲刷深度为 0～15 m 范围内,以有限元计算结果为基准,能量法的平均误差为 9.97%,等效单柱法的平均误差为 34.67%,能量法公式与有限元基本吻合;减少墩长、增加桩根数、选用正方形桩等可增加桥墩结构体系的屈曲承载能力;考虑 4 种河床土质时,桥墩结构体系的最佳桩长范围为 22～26 m.研究结果可供河流冲刷下桥墩结构体系稳定性的工程应用参考.
Buckling Analysis of Pier Structural System Under Dynamic Water Pressure and Scouring Based on Energy Method
In order to study the buckling load of the bridge pier structural system and its influencing factors under the coupling of scour and dynamic water pressure,the energy method was used to derive the buckling load formula of the bridge pier structural system under the action of scour,which is verified by the equivalent single-column model and the fi-nite element method.The influencing factors such as pier length,number of piles,soil type,and pile length was ana-lyzed.The results show that based on the finite element calculations with scour depth from 0 m to 15 m,the average er-ror of the energy method and the equivalent single-column method is 9.97%and 34.67%,respectively.The energy method formula is basically consistent with finite element.Reducing the pier length,increasing the number of piles,and choosing square piles can increase the buckling capacity.The optimal range of pile lengths for the structural system is 22-26 m when considering the four riverbed soils.It can be used as a reference for engineering applications on the stability of bridge abutment structural systems under river scour.
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万方数据
维普
