考虑桥塔风效应的多塔斜拉桥抖振响应分析

发布时间：2018-04-01 14:33

本文选题：多塔斜拉桥　切入点：桥塔　出处：《工程力学》2014年10期

【摘要】：该文以6塔斜拉桥——嘉绍大桥为研究对象,基于ANSYS瞬态动力学分析功能进行了嘉绍大桥风致抖振响应的非线性时域分析,研究了多塔斜拉桥主梁和桥塔在强风作用下的抖振响应特性,并详细考察了自激力和桥塔风效应对主梁和桥塔抖振响应的影响。分析结果表明:1)主梁与桥塔的风致抖振响应与结构的振动特性联系紧密,其抖振响应由于主梁与桥塔的动力耦合作用呈现出一定的独特性;2)考虑自激力后主梁竖向抖振响应明显减小,而对主梁横桥向和扭转抖振响应影响相对较小。同时,自激力对桥塔的横桥向抖振响应基本没有影响,但对桥塔的顺桥向抖振响应起到了明显的抑制作用;3)桥塔风效应对主梁的竖向和扭转抖振响应以及桥塔的顺桥向抖振响应基本没有影响,但会对主梁和桥塔的横桥向抖振响应产生较大影响。
[Abstract]:In this paper, the wind-induced buffeting response of the 6-tower cable-stayed bridge-Jiashao Bridge is analyzed in time domain based on the ANSYS transient dynamic analysis function. The buffeting response characteristics of main girder and tower of multi-tower cable-stayed bridge under strong wind are studied. The effects of self-excitation force and tower wind effect on the buffeting response of the main beam and tower are investigated in detail. The results show that the wind-induced buffeting response of the main beam and the tower is closely related to the vibration characteristics of the structure. The buffeting response of the bridge is very unique because of the dynamic coupling between the main beam and the bridge tower. (2) the vertical buffeting response of the main beam decreases obviously after considering the self-excited force, but the effect on the transverse and torsional buffeting response of the main beam is relatively small. The self-excited force has no effect on the buffeting response of the bridge tower. However, the tower wind effect has no effect on the vertical and torsional buffeting response of the main beam and the buffeting response of the bridge tower. However, the buffeting response of the crossbeam and tower will be greatly affected.
【作者单位】：东南大学混凝土及预应力混凝土结构教育部重点实验室;交通运输部公路科学研究院;
【基金】：国家自然科学基金项目(51178100,51208104) 交通运输部科技项目(2011318223170,2013319223120)
【分类号】：U448.27;U441.3

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