强震作用下大型排架式U型渡槽的损伤破坏分析
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摘要
强震作用下排架式渡槽结构易发生损伤开裂破坏,使结构整体抗震性能发生改变。基于混凝土塑性损伤本构模型,采用等效弹簧模拟桩-土之间的动力相互作用及温降法模拟槽身三向预应力钢筋作用,应用时域分析法对某大型排架式U型渡槽在强震作用下的动力响应规律及损伤破坏发展过程进行分析,得到强震作用下排架式渡槽的破坏模式及抗震薄弱部位,研究排架式渡槽结构的整体抗震特性。研究表明,在强震作用下结构损伤破坏较大区域主要集中于下部排架盖梁、连系梁与排架柱交接的部位,可能出现混凝土开裂现象,是该排架式渡槽结构的抗震薄弱环节,而槽身整体破坏性较小。对于地震烈度较高地区的排架式渡槽结构,应重点关注下部支撑结构的抗震安全性。
The bent-type aqueduct structure is prone to injury under strong earthquakes,and the structure's overall anti-seismic performance changes.Based on the concrete plastic damage constitutive model,the equivalent spring model was applied to stimulate the SSI while a temperature drop process was applied to stimulate the effect of pre-stressed steel bars in the aqueduct.In addition,the overall anti-seismic performance of bent-type aqueduct structure was studied through analyzing the dynamic response law and damage development process of a large bent-type U-shaped aqueduct under strong earthquakes by applying time-domain analysis.The research results indicated that under strong earthquakes,the bent frame joints are the anti-seismic weak parts of aqueduct,while overall damage of groove body is less likely.For bent-type aqueduct structures which are located in areas with high seismic intensity,main attention should be paid to the anti-seismic safety of the lower part of the support structure.
The bent-type aqueduct structure is prone to injury under strong earthquakes,and the structure's overall anti-seismic performance changes.Based on the concrete plastic damage constitutive model,the equivalent spring model was applied to stimulate the SSI while a temperature drop process was applied to stimulate the effect of pre-stressed steel bars in the aqueduct.In addition,the overall anti-seismic performance of bent-type aqueduct structure was studied through analyzing the dynamic response law and damage development process of a large bent-type U-shaped aqueduct under strong earthquakes by applying time-domain analysis.The research results indicated that under strong earthquakes,the bent frame joints are the anti-seismic weak parts of aqueduct,while overall damage of groove body is less likely.For bent-type aqueduct structures which are located in areas with high seismic intensity,main attention should be paid to the anti-seismic safety of the lower part of the support structure.
引文
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[2]Li Yuchun,Lou Menglin,Zhou Cheng.Analysis of verticalseismic effects for large-scale aqueduct bridges[J].Journalof Earthquake Engineering and Engineering Vibration,2008,28(2):102-107.[李遇春,楼梦麟,周成.大型渡槽的竖向地震效应分析[J].地震工程与工程振动,2008,28(2):102-107.]
[3]Xu Jianguo,Wang Bo,Chen Huai,et al.Longitudinal nonlin-ear pounding study of large-scale aqueduct under earthquake[J].Journal of Earthquake Engineering and Engineering Vi-bration,2010,30(5):126-133.[徐建国,王博,陈淮,等.地震作用下大型渡槽结构纵向碰撞非线性分析[J].地震工程与工程振动,2010,30(5):126-133.]
[4]Nie Liying,Gao Zhicheng,Zhu Guangfu,et al.Study on dy-namic responses of duct-water coupled components for aque-duct with seismic isulation[J].Journal of Hydroelectric En-gineering,2011,30(6):62-66.[聂利英,高志成,朱广甫,等.减隔震装置下渡槽槽-水耦合体动力响应特点研究[J].水力发电学报,2011,30(6):62-66.]
[5]Li Zhengnong,Zhang Panpan,ZhuXupeng,et al.Horizontalseismic response analysis of aqueduct with pier-soil dynamicinteraction[J].China Civil Engineering Journal,2010,43(12):137-143.[李正农,张盼盼,朱旭鹏,等.考虑桩-土动力相互作用的渡槽结构水平地震响应分析[J].土木工程学报,2010,43(12):137-143.]
[6]Zhang Duoxin,Wang Qingyun,Bai Xinli,et al.Applicationof finite element simulation of displacement-pressure of flu-id-solid interaction system for dynamic analysis of hydro-aq-ueduct[J].China Civil Engineering Journal,2010,43(1):125-130.[张多新,王清云,白新理,等.流固耦合系统位移-压力有限元格式在渡槽动力分析中的应用[J].土木工程学报,2010,43(1):125-130.]
[7]Lubliner J,Oliver J,Oller S,et al.A plastic-damage modelfor concrete[J].International Journal of Solids and Struc-tures,1989,25(3):299-326.
[8]Zhang Sherong,Zhu Qing,Li Sheng.Simulation methods ofprestress in numerical analysis of large aqueduct[J].Jour-nal of Hydroelectric Engineering,2009,28(3):90-100.[张社荣,祝青,李升.大型渡槽数值分析中预应力的模拟方法[J].水利发电学报,2009,28(3):90-100.]
[9]Zhang Sherong,Huang Hu.Analysis on seismic response ofhigh intake tower group considering the effect of travelingwave[J].Journal of Hydraulic Engineering,2009,40(9):1120-1126.[张社荣,黄虎.考虑地震行波效应的大型水电站高耸进水塔群响应分析[J].水利学报,2009,40(9):1120-1126.]
[10]Dai Xianghe,Chen Lingling,Wu Jiefang.Aseismic calcula-tion study on aqueduct across Yellow River for south to northwater diversion project[J].Journal of Yangtze River Scien-tific Research Institute,2002,19(3):52-55.[戴湘和,陈玲玲,吴杰芳.南水北调中线跨黄河渡槽抗震计算研究[J].长江科学院院报,2002,19(3):52-55.]
[11]Lu Zhoudao,Liu Changqing,Zhang Kechun,et al.Experi-mental study on the seismic performance of enveloped steelstrengthened RC frame joint[J].Journal of Sichuan Univer-sity:Engineering Science Edition,2010,42(3):56-62.[陆洲导,刘长青,张克纯,等.外包钢套法加固钢筋混凝土框架节点试验研究[J].四川大学学报:工程科学版,2010,42(3):56-62.]
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