整体式桥台桥梁抗洪性能参数分析

Parametric analysis on anti-flooding performance of integral abutment bridge

通过建立整体式桥台桥梁(永春上坂大桥)的有限元模型,将分析结果与实桥静载试验结果进行比较分析,验证模型的正确性;然后通过改变有限元模型桥的斜交角、跨数、桩基尺寸、桩侧土的类型、桥台高度等结构参数和阻水面积,定量研究不同参数变化对整体式桥台桥梁抗洪性能的影响.分析结果显示:斜交角、阻水面积、桩基尺寸及桩侧土类型的变化对桥梁抗洪性能的影响较大;整体式桥台桥梁的跨数对结构抗洪性能有一定影响,当桥梁跨数小于4时,改变跨数会较明显地影响桥梁的抗洪受力性能,而当桥梁跨数超过4时,跨数的变化对桥梁的抗洪受力性能的影响极小;另外,桥台高度的变化对整体式桥台桥梁的抗洪受力的影响也较小.

A finite element model （FEM） of Shangban bridge, Yongchun county, Fujian, was estab- lished and its accuracy was verified with a good agreement by comparing FEM with static loading test on the completed bridge. Then, the anti -flooding performance of the integral abutment bridge （IAB） was parametrically studied by changing the structural parameters including bridge skew angle, number of span, pile dimension, soil type around pile and abutment height as results show that parameters such as bridge skew angle, water draggi well as water dragging area. The ng area, pile dimension and soil type have a significant influence on the anti -flooding performance of IAB. Variation of span number can somehow have an influence on it unless the number is less than 4. In addition, abutment height has a little influence on it.