土体对悬臂挡墙模态的影响与应用
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摘要
模态参数是损伤诊断和状态评估的关键性指标,但对悬臂挡墙,由于墙体结构与墙后半无限土体相互作用机理的复杂性,目前尚无有效的方法模拟出其模态参数。文章首先通过现场脉冲锤击模态试验得出墙土系统实际模态参数,并与忽略墙后土体作用下挡墙结构模态参数对比,表明墙后土体影响效应不可忽略的基础上,对墙后土体给予墙体附加刚度、质量计算方法进行了研究,并进而进行了考虑土体影响效应时挡墙的有限元模态分析,其结果与现场测试相吻合,从而证明了土体影响效应计算方法的合理性与脉冲锤击模态测试方法的可行性。最后,在此基础上对挡墙主要损伤及破坏状态下模态参数特征及诊断方法进行了研究;为悬臂挡墙健康诊断提供了一种快速、简便、无损、有效的模态分析检测法。
The modal parameters are the key indexes for the damnification diagnosis and state evaluation.But for the complexities of the structure and soil interaction effect mechanism of cantilever retaining wall system,there is still no appropriate ways to simulate the modal parameters effectively at the moment.To solve the existing problem,practical modal parameters of structure system were obtained by field impulse hammering modal test.Compared them with the modal parameters of structure system ignoring the soil influence,it was concluded that the soil influence can not be ignored.And with the consideration of soil influence,calculation methods of additional stiffness and mass were analysed and modal analysis with the finite element method was undertaken for the retaining wall as well.It was approved that the calculating method for soil influence and impulse hammering modal test is feasible with good agreement with data from field test.Finally,the main disabled modes of the retaining wall,the modal parameters characteristics under damage state and health diagnosis methods were studies and a fast,simple,lossless and effective modal analysis evaluation method was proposed for the health diagnosis of cantilever retaining wall.
The modal parameters are the key indexes for the damnification diagnosis and state evaluation.But for the complexities of the structure and soil interaction effect mechanism of cantilever retaining wall system,there is still no appropriate ways to simulate the modal parameters effectively at the moment.To solve the existing problem,practical modal parameters of structure system were obtained by field impulse hammering modal test.Compared them with the modal parameters of structure system ignoring the soil influence,it was concluded that the soil influence can not be ignored.And with the consideration of soil influence,calculation methods of additional stiffness and mass were analysed and modal analysis with the finite element method was undertaken for the retaining wall as well.It was approved that the calculating method for soil influence and impulse hammering modal test is feasible with good agreement with data from field test.Finally,the main disabled modes of the retaining wall,the modal parameters characteristics under damage state and health diagnosis methods were studies and a fast,simple,lossless and effective modal analysis evaluation method was proposed for the health diagnosis of cantilever retaining wall.
引文
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[16]黄龙生,黄勇.桩动力检验的理论与实用方法[M].北京:地震出版社,2004:36-37.
[2]DUAN Z D,YAN G R,QU J P,et al.Damagedetection in ambient vibration using proportionalflexibility matrix with incomplete measured DOFs[J].Structural Control and Health Monitoring,2007,14(2):186-196.
[3]易伟建,周云,张望喜.弹性地基板模态试验及地基动参数识别[J].中国公路学报,2007,20(2):1-6.YI JIAN-WEI,ZHOU YUN,ZHANG WANG-XI.Modal experimenton elastic foundation slab and iden-tification of dynamic foundation parameters[J].ChinaJournal of Highway and Transport,2007,20(2):1-6.
[4]QIAO P Z,LU K,LESTARI W,et al.Curvaturemode shape-based damage detection in compositelaminated plates[J].Composite Structures,2007,80(3):409-428.
[5]郭惠勇,李正良,彭川.结构损伤动力识别技术的研究与进展[J].重庆建筑大学学报,2008,30(1):140-145.GUO HUI-YONG,LI ZHENG-LIANG,PENG CHU-AN.Researches and advances in structural damagedynamic identification technology[J].Journal ofChongqing Jianzhu University,2008,30(1):140-145.
[6]XU B,CHEN G,WU Z S.Parametric identificationfor a truss structure using axial strain[J].Computer-Aided Civil and Infrastructure Engineering,2007,22:210-222.
[7]刘纲,黄宗明,杨溥.恒载作用下梁和桥梁的损伤识别研究[J].重庆建筑大学学报,2008,30(5):28-31.LIU GANG,HUANG ZONG-MING,YANG PU.Damage detection for beam and bridge under dead load[J].Journal of Chongqing Jianzhu University,2008,30(5):28-31.
[8]ZHU H P,XU Y L.Damage detection of mono-coupled periodic structures based on sensitivity analysisof modal parameters[J].Journal of Sound andVibration,2005,285(2):365-390.
[9]HU SAU-LON J,WANG S,LI H J.Cross-modalstrain energy method for estimating damage severity[J].Journal of Engineering Mechanics,2006,132(4):429-437.
[10]唐天国,刘浩吾,刘晓森.变时基原理在裂缝损伤梁动态检测中的应用[J].四川大学学报,2005,37(3):20-23.TANG TIAN-GUO,LIU HAO-WU,LIU XIAO-SHEN.Application of variable time base theory todynamic detection of beam with crack damage[J].Journal of Sichuan University,2005,37(3):20-23.
[11]尹强,陈世教,冀满忠.基于ANSYS的塔式起重机模态分析[J].重庆建筑大学学报,2005,27(6):97-100.YIN QIANG,CHEN SHI-JIAO,JI MAN-ZHONG.Model analysis of tower crane structure based onANSYS[J].Journal of Chongqing Jianzhu University,2005,27(6):97-100.
[12]吴军帅,姜朴.土与混凝土接触面的动力剪切特性[J].岩土工程学报,1992,14(2):61-66.WU JUN-SHUAI,JIANG PU.Hydraulic shearcharacteristic for contact surface of soil and concret[J].Chinese Journal of Geotecnical Engineering,1992,14(2):61-66.
[13]尉希成,周美玲.支挡结构设计手册[M].北京:中国建筑工业出版社,2007:43-44.
[14]梁波.回填土综合内摩擦角0φ方法的可靠性研究[J].兰州铁道学院学报,1996,15(2):6-12.LIANG BO.Dependability method study for comp-ositive internal friction angle of backfill soil[J].Journalof Lanzhou Railway Institute,1996,15(2):6-12.
[15]王均星,焦修明,陈炜.龙滩工程底孔弧形闸门的自振特性[J].武汉大学学报,2008,41(5):31-34.WANG JUN-XING,JIAO XIU-MING,CHEN WEI.Free vibration characteristics of bottom outlet radialgate for Longtan Project[J].Engineering Journal ofWuhan University,2008,41(5):31-34.
[16]黄龙生,黄勇.桩动力检验的理论与实用方法[M].北京:地震出版社,2004:36-37.
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