内填部分混凝土钢桥墩延性性能简化计算方法  

Simplified numerical method determining ductility behavior of partially concrete-filled steel box-section bridge piers

作　　者：徐旻洋 高圣彬[1] 

机构地区：[1]上海交通大学土木工程系,上海200240

出　　处：《河北工程大学学报（自然科学版）》2014年第3期9-14,共6页Journal of Hebei University of Engineering:Natural Science Edition

基　　金：上海市科学技术委员会浦江人才计划(08PJ1406400)

摘　　要：采用二维梁单元模型模拟内填部分混凝土箱形截面钢桥墩的延性性能。考虑翼缘宽厚比、柱长细比和混凝土填充率三个参数,建立了20个二维梁单元模型。将模拟结果与三维精确有限元分析结果进行对比,提出了针对二维模拟结果的延性修正系数。将修正后的二维模拟结果与试验结果对比,吻合良好,验证了所采用有限元分析方法以及延性修正系数的准确性与有效性。研究结果表明:混凝土填充率的提高,可以有效提高钢桥墩的延性性能;翼缘宽厚比和柱长细比的增加会导致钢桥墩延性的降低。最后提出了钢桥墩最优混凝土填充率确定方法建议。This paper aims to investigate the ductility behavior of partially concrete - filled steel box - section bridge piers by 2 - D beam element formulation. Twenty beam element models are estab- lished, in which three parameters, the flange plate width - thickness ratio, slenderness ratio of steel piers and height of filled - in concrete are considered. The correction coefficient of ductility behavior obtained from 2 - D beam element formulation is proposed by comparing the numerical results with 3 - D accurate results. The modified 2 - D simulation results are in line with the experimental results, which indicate that the proposed numerical method and the correction coefficient are accurate and val- id enough. The increase of concrete filling rate can effectively improve the ductility of steel bridge piers. Increasing of the flange plate width - thickness ratio and slenderness ratio of steel piers will lead to a decline in steel pier ductility.

关 键 词：箱形截面钢桥墩 简化分析 延性性能 最优混凝土填充率 

分 类 号：U443.22[建筑科学—桥梁与隧道工程]