带肋圆形截面钢桥墩的延性性能预测  

Ductility prediction of stiffened steel pipe-section bridge piers

作　　者：刘乃藩 高圣彬[1] 

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240

出　　处：《哈尔滨工业大学学报》2017年第3期138-143,共6页Journal of Harbin Institute of Technology

基　　金：上海市科学技术委员会浦江人才计划(08PJ1406400)

摘　　要：为了解带肋圆形截面钢桥墩在承受轴向压力和水平往复荷载作用下的无量纲化极限承载力和延性性能,通过与既有试验结果对比,确定所采用的有限元建模方法和修正双曲面钢材本构模型的准确性.针对能有效提高圆形截面钢桥墩延性性能的八根肋形式的钢桥墩模型,研究截面正则径厚比、钢桥墩正则长细比、加劲肋正则长细比和轴压比等参数对钢桥墩延性性能和无量纲化极限承载力的影响,并基于参数化分析结果,拟合预测该类钢桥墩的延性性能和无量纲化极限承载力的计算公式.研究结果表明:修正双曲面本构模型能够较准确预测钢桥墩的力学性能,且随着正则径厚比、钢桥墩正则长细比、加劲肋正则长细比和轴压比的减小,桥墩的无量纲化极限承载力和延性性能得到显著提高.To investigate the nondimensionalized ultimate strength and ductility behavior of stiffened steel pipesection bridge piers subjected to a constant vertical load and cyclic lateral loads, the modified two-surface constitutive model and its finite element modeling were verified by comparing with the test results,and the effects of radius-thickness ratio,pier＇s slenderness ratio,stiffener＇s slenderness ratio and axial load ratio of the piers with eight stiffeners were investigated on the nondimensionalized ultimate strength and ductility. Some formulas based on the parametric analytical results were proposed to predict the nondimensionalized ultimate strength and ductility of piers. Numerical simulation results show that the nondimensionalized ultimate strength and ductility behaviors of the steel bridge piers could be notably improved when decreasing of radius-thickness ratio,pier＇s slenderness ratio,stiffener＇s slenderness ratio and axial load ratio.

关 键 词：桥梁工程 钢桥墩 修正双曲面模型 无量纲化极限承载力 延性性能 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]