桥梁拉(吊)索损伤后力学分析及安全评价
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摘要
拉(吊)索构件是有索桥梁结构如中、下承式拱桥和悬索桥的重要组成部分,大量事故表明,拉索的损伤通常会引起桥梁结构力学特性发生改变,进而威胁到桥梁的安全。由于有索桥梁结构的复杂性以及对在役损伤拉索研究的相对滞后,至今还没有形成较为系统的针对拉索损伤机理分析、损伤识别、损伤拉索系统力学分析及安全评估的研究方法。本文将理论分析、仿真计算及实桥算例相结合,对损伤拉索系统的静力重分布、动力损伤识别、安全性及耐久性评估等方面的关键问题进行研究。主要研究内容包括以下几个方面:
     (1)为了解决工程实践中短索索力测试计算难题,本文通过对拉索边界条件的合理模拟,建立了简支和固支复合边界条件下短索索力计算模型,推导了复合边界条件下短索索力计算公式,并采用Matlab程序对其进行了求解。提出了边界条件系数的概念,通过参数分析确定了影响边界条件系数的主要因素。以宜昌长江公路大桥短索测试计算为例,对比分析了简支、固支及复合边界条件下拉索索力及抗弯刚度的计算结果,验证了复合边界条件拉索索力计算方法的有效性。
     (2)基于限元理论与矩阵摄动理论,将吊索损伤模拟成为吊索系统的一阶摄动,从理论上分析吊索损伤后吊索系统张力向量变化的总体趋势,以某钢管混凝土系杆拱桥为工程实例建立其三维有限元模型,通过仿真计算,分析单根吊索和多根吊索损伤后全桥吊索系统的张力重分布规律及影响因素。
     (3)通过对拉索损伤前后结构频率变化率的分析,提出将桥梁结构频率与局部拉索索力相结合的拉索损伤快速识别方法,通过分析拉索损伤前后结构振型的变化,提出以模态振型Z坐标变化率加权积为识别指标的拉索损伤快速定位方法,通过仿真计算对两种损伤识别方法的有效性进行验证。
     (4)分析了丹尼尔效应引起的拉索钢丝强度衰减规律,建立了基于损伤因子的拉索强度安全评估模型,推导出功能函数的矩阵形式,依据各参数的分布特性生成随机样本,采用Monte-Carlo法对不同断丝率时拉索的强度安全性进行概率评估,提出了临界断丝数的概念,并将其应用于拉索强度安全的快速评估中。
     (5)根据拉索锈蚀机理及损伤演化过程,将钢丝锈蚀损伤生命周期简化为护套老化阶段、镀锌层锈蚀阶段、钢丝体均匀锈蚀与坑蚀阶段、钢丝腐蚀疲劳断裂阶段共4个阶段。在Faraday和Paris对金属腐蚀寿命研究的基础上,建立了钢丝腐蚀及腐蚀疲劳各阶段经历时间的分析模型,通过仿真计算,对钢丝锈蚀全寿命周期、各阶段经历时间所占比重进行了分析,进而对拉索的锈蚀寿命进行了近似评估。
Cables (or slings) are the important parts of cable bridge structure such as long span cable-supported bridges and half-through or through arch bridges. Many accidents show that the cable damage often causes the bridge mechanical characters change, even threaten the bridge safety. Due to the complexity of cable system and the lagging study on damaged cable, there is not a systematic research for cable about mechanism analysis, damage identification, mechanic calculation and safety evaluation of damaged cable. In this paper, theoretical analysis, simulation calculation and bridge example are associated to study some key problems about static calculation, dynamic analysis and safety evaluation of damaged cable system. The main contents are as followings:
     (1) In order to solve the problems of short cable tension test and calculation, the analysis model of short cable is built on the basis of the reasonable simulation for the boundary conditions of cable, the calculating formula is deduced and solved by Matlab program. The concept of boundary condition coefficients is put forward and the influence factors for boundary conditions of short suspenders are determined. Moreover, YiChang Bridge as an example, the analysis results of three models are compared and analyzed to verify the availability of complex boundary conditions.
     (2) Based on the finite-element theory and matrix perturbation theory, sling damage is simulated as the 1~(st) perturbation of sling system, the general tendency of damage suspender tension is analyzed in theory. Meantime, a 3D finite-element model of a concrete-filled steel tube arch bridge is built to research the redistribution factors of cable tension about single and multi-cable damages system, some correlative conclusion is drawn.
     (3)According to the analysis for the change rates of cable before and after damaged, a quick damage identification method which combined the structure integral frequencies with the local cables tension, is put forward, at the meantime, a quick cable damage positioning method is presented, which the weighted products of the coordinate change rates in Z orientation are taken as the damage identify indicators. And a simulation calculation is carried out to verify their availabilities.
     (4) The attenuation regularities of wires intension caused by Daniel effect are analyzed, a cable safety evaluation model is built based on safety factors. And the matrix form of limited state function is built to simplify the calculation process by computer, the random samples are generated according to their distributing characters, then the Monte-Carlo method is used to assess the cable safety, then a critical number of broken wires is determined and applied to the rapid assessment of cable safety.
     (5) According to cable corrosion mechanism and damage evolvement process, the life cycle of corrosion cable is reduced into four stages, which includes jacket ageing stage, zinc coat corrosion stage, steel wire uniform and pitting corrosion stage and fatigue corrosion stage. Based on the research of Faraday and Paris, the time models of four stages are built, the life cycle of corrosion wire and every stage time proportion are analyzed, and the cable corrosion life is evaluated approximately.
引文
[1]朱新实,刘效尧.预应力技术及材料设备[M].北京:人民交通出版社,2005.1
    [2]叶觉明.缆索用钢丝断丝问题[J].钢结构,2003,18(3):35-37
    [3]戴晓栋.章镇桥斜拉索防护及使用寿命分析[J].公路交通技术,2007年第4期
    [4]汤国栋,杨弘,朱正刚等.桥梁吊索及拉索的健康诊断[J].公路,2002年第9期
    [5]唐小萍.平行钢绞线拉索与平行钢丝拉索的特性、经济性比较分析[J].桥梁建设,1997,(4):17-19
    [6]经柏林,谢华鸾.斜拉桥拉索研究综述[J].中国市政工程,2003,(6):19-22
    [7]张喜刚.苏通大桥总体设计[J].公路,2004,(7):1-11
    [8]彭德运,彭晔丹.苏通大桥主桥设计与施工[J].现代交通技术,2007,4(4):34-38
    [9]顾乃健:桥索用镀锌钢丝生产工艺探讨[J].金属制品,2006,32(5):14-16
    [10]王永珩.我国桥梁建设的成就、现状和存在的问题[J].公路,2004,(12):155-157
    [11]李丹,丁一峥.高强钢丝和钢绞线拉索的分析比较[J].公路交通科技,2005,(6):78-82
    [12]项海帆.21世纪世界桥梁工程的展望[J].土木工程学报,2000,33(3):1-6
    [13]马坤全.大跨径斜拉桥建设与展望[J].国外桥梁,2000,(4):60-65
    [14]龙跃等.拱桥拉索病害研究与对策[J].桥梁建设,2006,(3):70-73
    [15]杨文静.斜拉桥拉索结构中钢绞线腐蚀行为初探[D].硕士学位论文,重庆大学,2006
    [16]Brenda Littlea,Roger Staehleb,Robert Davisc.Fungal in uenced corrosion of post-tensioned cables.International Biodeterioration & Biodegradation,2001,(47):71-77
    [17]徐俊.拉索损伤演化机理与剩余使用寿命评估[D].同济大学博士学位论文,2006
    [18]黄跃平,胥明,姜益军等.拉索局部腐蚀检测与评估分析[J].腐蚀科学与防护技术,2006,18(2):132-135
    [19]吕战鹏,杨武.遭受应力腐蚀开裂的设备寿命预测技术[J].腐蚀科学与防护技术,1999,11(1):57
    [20]张崧,彭光俊.在役金属材料剩余寿命预测技术[J].实用测试技术,2007,(4):5-6
    [21]陈志芳等.不明配筋梁的剩余疲劳寿命评估[J].长沙铁道学院学报,2003,21(1):19-24
    [22]杨少军.桥梁拉索体系损伤的检测和监测方法[J].2005,(3):130-134
    [23]张家辉.在役缆索自动检测[J].无损检测,2006,25(2):99-101
    [24]张勇.磁漏检测若干关键技术的研究[D].中国科学技术大学博士学位论文,2007
    [25]陆少鹏何秀堂庄永芬编译.无损检测手册—射线探伤法.四川科学技术出版社,1986
    [26]袁振明,马羽宽,何泽云.声发射技术及其应用[M].北京:机械工业出版社,1985.
    [27]李冬生,欧进萍.声发射技术在拱桥吊索损伤监测中的应用[J].沈阳建筑大学学报(自然科学版),2007,23(1):6-10
    [28]高欣,李东生等.拱桥吊索荷载效应光线光栅监测与安全评定[J].大连理工大学学报,2006,46(增刊)
    [29]薛文.关于桥梁承载能力评定方法的探讨[J].河北工业大学成人教育学院学报,2001,16(2):33-36
    [30]朱劲松,肖汝诚.大跨度斜拉桥拉索安全性分析方法研究[J].土木工程学报,2006,39(9):74-79
    [31]Cremona C.Probabilistic approach for cable residual strength assessment [J].Engineering Structures,2003,25(3):377-384.
    [32]Cheng Jin,Xiao Ru-cheng.Application of Inverse Reliability Method to Estimated of Cable Safety Factors of Long-span Suspension Bridges. [J].Structural Engineering and Mechanics,2005,23(2):195-207.
    [33]Perry.Cable Safety Factors for Four Suspension Bridges[J].Journal of Bridge Engineering,1999,9
    [34]Sante Camo,P.E.Probabilistic Strength Estimates and Reliability of Damaged Parallel Wire Cables[J].Journal of Bridge Engineering,2003,9
    [35]John Matteo,George Deodatis,David P.Billington.Safety Analysis of Suspension-bridge Cables:Williamsburg Bridge[J].Journal of Structural Engineering,Vol.120,No.11,November,1994.
    [36]GB50068-2001,建筑结构可靠度设计统一标准[S].北京:中国建筑工业出版社,2002
    [37]吴祖松,李进荣.拟建结构与在役结构的可靠度分析比较[J].2007,33(29):76-77
    [38]贾星兰,刘文珽.构件可靠度与平均安全系数的研究[J].北京航空航天大学学报,2002,28(2):205-207
    [39]党志杰.斜拉索的疲劳抗力[J].桥梁建设,1999年第4期
    [40]杨美良,李波,黄立浦.部分斜拉桥拉索疲劳可靠度分析[J].长沙交通学院学报,2007,23(1)16-10
    [41]徐灏.疲劳强度设计[M].北京:机械工业出版社,1988.
    [42]陈兵,赵雷,杨弘,周剑波.拉萨柳梧大桥吊索疲劳寿命研究[J].铁道建筑,2007,(4):6-8
    [43]尚鑫,徐岳.基于灰色理论的斜拉桥拉索安全性评价[J].长安大学学报,2004,24(1):52-55
    [44]王春生,陈惟珍,陈艾荣.桥梁损伤安全评定与维护管理策略[J].交通运输工程学报,2002,2(4):21-28
    [45]Amain B.Mehrabi,Niket M.Telang,Hossein Ghara,and Paul Fossie.Health Monitoring of Cable-Stayed Bridges- A Case Study[J].Structures,2004
    [46]Amain B.Mehrabi.Assessment of In-Service Cable Stayed Bridges-Approach and Findings[J].Structures,2006
    [47]Casas J R.A combined method for measuring cable forces:the cable-stayed Alamillo bridge,Spain [J].Structural Engineer-ing International,1994,4(4):235-240
    [48]杨金凤,欧阳衡.桥梁在役拉索索力检测介绍[J].水运工程,2005,(7).
    [49]郑罡,倪一清,高赞明等.斜拉索张力测试和参数评估的理论和应用[J].土木工程学报,2005,38(3):64-69.
    [50]吴海军,陈思甜,龚尚龙等.斜拉桥索力测试方法研究[J].重庆交通学院学报,2001,20(4):23-25
    [51]骆宁安,王卫峰,韩大建.广州体育馆拉索索力测试方法及其应用[J].华南理工大学学报,2002,30(2):73-75
    [52]郑宪超,郝超.用振动法估计拉索张力的实用公式[J].国外桥梁,1997,(3):27-32
    [53]陈刚,任伟新.基于环境振动的斜拉桥拉索基频识别[J].地震工程与工程振动,2003,23(3):100-106
    [54]张运波,林玉森,高伟等.部分斜拉桥的索力测试与分析[J].铁道标准设计,2005,(5).
    [55]Himshi Zui,Tohru Shinke,Yoshio Namita.Practical Formulas for Estimation of Cable by Vibration Method[J].Journal of Structure Engineering,1996,122(6):651-65
    [56]Kroneberger-Stanton KJ,Hartsough BR.A Monitor for Indirect Measurement of Cable Vibration Frequency and Tension [J].Transaction of the ASCE,1992,35(3):341-346
    [57]苏成,徐郁峰,韩大建.频率法测量索力中的参数分析与索抗弯刚度的识别[J].公路交通科技,2005,22(5):75-78
    [58]宋一凡.公路桥梁动力学[M].北京:人民交通出版社,2000
    [59]王俊,汪凤泉,周星德.基于波动法的斜拉桥索力测试研究[J].应用科学学报,2005,23(1):90-93
    [60]段波,曾德荣,卢江.关于斜拉桥索力测定的分析[J].重庆交通学院学报,2005,24(4):6-9
    [61]魏建东.索力测定常用公式精度分析[J].公路交通科技,2004,21(2):53-56
    [62]宋一凡,贺栓海,吴小平.固端刚性拉索索力分析能量法[J].西安交通大学报,2001,21(1):55-57
    [63]许俊.斜拉索索力简化精度计算中的精度分析[J].同济大学学报,2001,(5):611-615
    [64]郭铁能等.航天器姿态和振动的拉索控制模型.清华大学学报(自然科学版)[J].2005,45(11):1498-1501
    [65]朱保兵等.刚性拉索横向振动控制的模态等效方法.合肥工业大学学报(自然科学版)[J].2006,29(4):475-477
    [66]贺栓海.桥梁结构理论与计算方法[M].北京:人民交通出版社,2003
    [67]包世华.结构动力学[M].武汉:武汉理工大学出版社,2005
    [68]李国豪.桥梁结构稳定与振动[M].北京:中国铁道出版社,1992
    [69]刘文峰,应怀樵,柳春图.考虑刚度及边界条件的索力精确求解[J].振动与冲击,2003,22(4):12-13
    [70]任伟新,陈刚.由基频计算拉索拉力的实用公式[J].土木工程学报.2005,38(11):26-30
    [71]周铁,徐树方,张平文.计算方法[M].北京:清华大学出版社,2006
    [72]高会生,李新叶,胡智奇等译.MATLAB原理与工程应用(第二版)[M].北京:电子工业出版社,2006
    [73]金平,陆剑峰,王晨.宜昌长江公路大桥吊索制作及静载试验[D].宜昌长江公路大桥工程建设论文集.北京:人民交通出版社,2002
    [74]N.L.Frigon and D.Mathews,Practical Guide to Experiment Design,JohnWiley & Sons[M].New York:NY,1997
    [75]N.Draper and H.Smith,Applied Regression Analysis,2~nd ed.,nJohnWiley & Sons[M].New York:NY,1981
    [76]蔡晶,吴智深,李兆霞.静力载荷作用下结构参数识别及状态评估的统计分析[J].工程力学,2004,21(6):76-83
    [77]崔飞,袁万城,史家钧.基于静载试验进行桥梁结构损伤识别[J].桥梁建设2003,(2):4~7
    [78]陈孝珍.基于静态测量数据的桥梁结构损伤识别研究[D].华中科技大学博士学位论文,2005
    [79]Yam L.H,Li Y.Y.,Wong W.O.Sensitivity Studies of Parameters for Damage Detection of Dlate-like Structures Using Static and Dynamic Approaches[J].Engineering Structures,2002,24(11):1465~1475
    [80]Wang X.,Hu N.,Fukunaga H,et al.Structural Damage Identification Using Static Test Data and Changes in Frequencies[J].Engineering Structures,2001,23(6):610~621
    [81]Hjelmstad K.D.,Shin S.Damage Detection and Assessment of Structures From Static Response[J].Journal of Engineering Mechanics,1997,123(6):568~76
    [82]杜思义,殷学纲,陈淮.基于频率二阶摄动的结构损伤识别方法[J].应用力学学报,2006,23(4):613-618
    [83]杜思义,殷学纲,陈淮.中(下)承式拱桥吊索静张力分析方法的改进[J].世界地震工程,2006,22(4):99-103
    [84]杜思义,殷学纲,张卫民,陈淮.基于摄动有限元方法对梁结构损伤的识别[J].世界地震工程,2006,22(2):115-119
    [85]殷学纲,姚建军.中承式拱桥吊索损伤对吊索系静张力的影响[J].中国公路学报,2004,17(1):45-48
    [86]李子青,郝宪武.结构振动与控制[M].北京:人民交通出版社,1998
    [87]耿浩,王睿,高芳清.模态变化对钢桁梁模型桥的损伤检测研究[J],桥梁建设,1998,(2):67-70.
    [88]薛刚,许有俊,翟耀飞.结构动力特征识别技术在工程检测中的应用[J].包头钢铁学院学报,2005,24(1):54-56
    [89]王柏生,倪一清,高赞明.框架结构连接损伤识别神经网络输入参数的确定[J].振动工程学报,2000,13(1):137-142.
    [90]王利恒,周锡元,阎维明,结构损伤检测方法的一些新进展[J].四川建筑科学研究,2005,31(6):59-64
    [91]马宏伟,杨桂通.基于结构振动的损伤探测的基本方法[J].太原理工大学学报,1999,30(5):461-468
    [92]高维成,刘伟,邹经湘.基于结构振动参数变化的损伤探测方法综述[J].振动与冲击,2004,23(4):1-9
    [93]高芳清,金建明,高淑英.基于模态分析的结构损伤检测方法研究[J].西南交通大学学报,1998,33(1):1082113.
    [94]徐丽,吴高烈.结构动力学损伤诊断研究现状综述[J].国外建材科技,2006,27(1):32-34
    [95]王晓光,陆秋海.索结构损伤的行波识别法[J].清华大学学报(自然科学版),2003,(43)5:673-377
    [96]吴波,胡云霞.基于BP神经网络的空间索杆结构承重索损伤识别研究[J].地震工程与工程振动,2005,25(6):96-101
    [97]Kim-Ho Ip,Ping-Cheung Tse.Locating Damage in Circular Cylin-drical Composite Shells Based on Frequency Sensitivities and Mode Shapes[J].European Journal of Mechanics A/Solids,2002,21:615-628
    [98]Jeong-Tae Kim,Yeon-Sun Ryu,Hyun-Man Cho,Norris Stubbs.Damage Identification in Beam-type Structures:Frequency-based Method vs Mode-shape-based Method [J],Engineering Structures,2003,25:57-67
    [99]谢俊,韩大建.一种改进的基于频率测量的结构损伤识别方法[J].工程力学,2004,21(1):21-25
    [100]刘文峰,柳春图,应怀憔.通过频率改变率进行损伤定位的方法研究[J].振动与冲击,2004,23(2):28-30
    [101]N Stubbs,R Osegueda.Global nondestructive damage evaluation in solid [J].International Journal of Analytical and Experimental Modal analysis,1990,5(2):67-79.
    [102]Hurty W C.Dynamic Analysis of Structural Systems Using Component Modes[J].A IAA Journal,1965,3:678~685
    [103]Hou S N.Review of Modal Synthesis Techniques and A New Approach[J].Shock and Vibration Bulletin,1969,40(4):25~30
    [104]Craig R R,Bampton M C C.Coupling of Substructures for Dynamic Analysis[J].A IAA Joumal,1968,6:1313~1319
    [105]Hale A L,Meirovitch L.A Procedure for Improving Discrete Substructure Representation in Dynamic Synthesis.A IAA Journal,1982,20:1128~1136
    [106]李爱群,丁幼亮.工程结构损伤预警理论及其应用[M].北京:科学技术出版社,2007
    [107]宗周红,任伟新,阮毅.土木工程结构损伤诊断研究进展.土木工程学报,2003,36(5):105-110
    [108]Liew K M,Chang Q.Application of wavelet theory for crack identification in structures[J].Journal of Engineering Mechanics,1998,124(2):152-157
    [109]George Baker.Discussion of“Probabilistic Strength Estimates and Reliability of Damaged Parallel Wire Cables” by Sante Camo[J].Journal of Bridge Engineering.Volume 10,Issue 2,pp.238-239(March/April 2005).
    [110]JTJ027-96.公路斜拉桥设计规范(试行)[S]
    [111]赵国藩.结构可靠度理论[M].北京:中国建筑工业出版社,2000.
    [112]陈礼刚,袁建东,李晓东,高立堂.高温下预应力钢丝的应力应变关系[J].重庆建筑大学学报,2006,28(4):47-50
    [113]Gollwitzer S,Rackwitz R.On the reliability of Daniels systems.Structural Safety 1990;7:229-43.
    [114]Hohenbichler M,Rackwitz R.Reliability of parallel systems under imposeduniform strain.ASCE J Eng Mech 1983;109(3):896-907.
    [115]Daniels HE.The statistical theory of the strengthof bundles of threads.Proc Roy Soc Lond A Mat 1945;A183:405-35.
    [116]Faber M H,Enelund S,Rackwitz R.Aspects of parallel wire cable reliability [J].Structural Safety,2003,25(2):201-225.
    [117]Zhu Jin-song,Xiao Ru-cheng,He Li-zhi.Probability Evaluation Method for Cable Safety of Long-span Cable-stayed Bridges[J].Journal of Southeast University (English Edition) 2007,23(1):92-97
    [118]徐仲,张凯院等.矩阵论简明教程(第二版)[M].科学技术出版社,2005
    [119]朱新实,刘效尧.预应力技术及材料设备[M].北京:人民交通出版社,2005
    [120]AngAH-S,Tang W H.工程规划与设计中的概率概念(第Ⅱ卷)[M].北京:冶金工业出版社,1991
    [121]Kiyohiro Imail, Dan M.Frangopol.Reliability-based Assessment of Suspension Bridges:Application to the INNOSHIMA Bridge[J]. 2001,6(6):398-411
    [122]JTG D60-2004.《公路桥涵设计通用规范》[S].北京:人民交通出版社,2004.
    [123]江苏省交通工程质量检测中心.232省道常州段运村大桥西幅桥垮塌现场调查及计算分析报告[R].2007,6
    [124]贡金鑫,魏巍巍.工程结构可靠性设计原理[M].北京:机械工业出版社,2007
    [125]黄日金,程昭荣,蒋业东等.HDPE在桥梁索体中的应用及索的施工简介[J].预应力技术,2005,(5):15-18
    [126]CJ 3058—1996.塑料护套半平行钢丝拉索[S],中华人民共和国建设部,1996
    [127]刘亚平,李晖,魏绪玲.高密度聚乙烯户外自然老化的力学性能研究[J].山东化工,2007,36(8):5-7
    [128]叶觉明.热挤HDPE护套在桥梁缆索防护中的应用[J].工程塑料应用,2005,33(3):42-45
    [129]GBT2973—2004镀锌钢丝锌层质量试验方法[S]
    [130](GB/T17101-1997)桥梁缆索用热镀锌钢丝[S]
    [131]GB/T 13912—2220金属覆盖层钢铁制品热浸镀锌层技术要求及试验方法[S].
    [132]ISO 1461:1999 Hot dip galvanized coatings on fabricated Iron and Steel Articles—Specifications and Test Methods[S].
    [133]曹楚南.中国材料的自然环境腐蚀[M].北京:化学工业出版社,2005
    [134]卢锦堂,许乔瑜,孔纲.热浸镀锌技术与应用[M].北京:机械工业出版社,2006
    [135]李仲,吕国志,葛森.一种预测蚀坑腐蚀疲劳寿命的概率模型[J].机械强度,2004,26(s):226-228
    [136]徐可君,江龙平,隋育松.预测腐蚀疲劳的概率方法[J].机械强度,2003,25(2):229-232
    [137]Keith C.K.,Irene M.C.Effects of Seepage Velocity and Temperature on the Dechlorination of Chlorinated Aliphatic Hydrocarbons[J].Journal of Environmental Engineering,2007(9):859-868.
    [138]中华人民共和国行业标准.《公路桥涵设计通用规范》(JTG D60-2004).北京:人民交通出版社,2004.
    [139]Paris P C,Erdogan E A critical analysis of crack propagation laws[J].Journal of Basic Engineering,1963(85):528-534.
    [140]袁劲松.金属腐蚀疲劳裂纹扩展速率的近似计算[J].材料开发与应用,2000,15(2):26-29
    [141]Bowie O L.Analysis of an infinite plate containing radial cracks originating at the boundary of an internal circular hole.Journal of Mathematics and Physics,1990,35(1):60-71

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