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作 者:周鼎鈜 李睿[1] 崔又文 李晓章 罗仕庭 Zhou Ding-hong;Li Rui;Cui You-wen;Li Xiao-zhang;Luo Shi-ting(The Fauly of Civil Engneering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China;Zhaoyang District Water Affairs Bureau of Yunnan Province,Zhaotong 657000,China;Kunming Engineering Corporation Limited,Power China,Kunming 650500,China)
机构地区:[1]昆明理工大学建筑工程学院,云南昆明650500 [2]云南省昭通市昭阳区水务局,云南昭通657000 [3]中国电建集团昆明勘测设计研究院有限公司,云南昆明650500
出 处:《工程抗震与加固改造》2023年第3期126-134,共9页Earthquake Resistant Engineering and Retrofitting
基 金:国家自然科学基金(51568029)。
摘 要:倒虹吸桥架由于倒虹吸管道内水体质量的影响,而有“头重脚轻”的受力特点,同时多管式倒虹吸桥架也会出现水体偏载的运营工况,在地震荷载作用下,从而导致桥架结构在地震波加速度的影响下会产生较大的位移,对结构受力非常不利,严重时会导致混凝土结构开裂、破坏,因此分析其在地震作用下的动力响应至关重要。本文以滇中引水工程中的小鱼坝倒虹吸桥架为例,使用Ansys软件建立通过Westergard附加质量法考虑流固耦合的有限元模型,研究其地震作用下的动力特性。结果表明,倒虹吸桥架结构由于跨径较大,其横向刚度和顺桥向的扭转刚度较小,地震作用时桥架结构跨中横向和竖向动力响应均较大,不利于抗震,并得出拱脚、1/4截面、排架底部等下部支承结构受力最不利。对于多管倒虹吸桥架结构的抗震计算,可直接采用最大设计流量工况,而不用考虑水体偏载时的工况,地震作用下的动力响应还由管内水体总质量占主导,水体偏载效应是影响桥架结构地震动响应的次要因素。The inverted siphon bridge has the force characteristics of"head-heavy"due to the mass of water in the inverted siphon pipe,and the multi-pipe inverted siphon bridge also has the operating condition of water bias load,which leads to large displacement of the bridge structure under the influence of seismic acceleration,which is very unfavorable to the structural force.In serious cases,it will lead to cracking and damage of the concrete structure,so it is important to analyze its dynamic response under seismic action.In this paper,the dynamic response of the inverted siphon bridge frame of the Xiaoyu Dam in the Yunnan Central Diversion Project is studied by using Ansys software to build a finite element model considering the fluid-structure coupling through the Westergard additional mass method.The results show that the transverse stiffness and torsional stiffness of the inverted siphon bridge structure are small due to the large span diameter,and the transverse and vertical dynamic response of the bridge structure is large in the span during earthquake,which is not conducive to seismic resistance,and it is concluded that the lower supporting structures such as the arch foot,1/4 section,and the bottom of the row frame are the most unfavorable.For the seismic calculation of the multi-pipe inverted siphon bridge structure,the maximum design flow condition can be used directly without considering the condition of the water body bias load,the dynamic response under seismic action is also dominated by the total mass of the water body in the tube,and the water body bias load effect is a secondary factor affecting the ground vibration response of the bridge structure.
关 键 词:流固耦合 地震响应 数值模拟 水体偏载 附加质量
分 类 号:TV672.5[水利工程—水利水电工程] TV312
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