频繁爆破震动对框架结构性能的影响研究
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摘要
爆破是矿山生产中常用的技术,但是爆破震动往往会对矿区附近房屋产生影响,从而引起结构不同程度的损伤,影响结构的耐久性和安全性。作者以某露天矿境界边坡近坡肩的1栋3层框架结构建筑为研究对象,通过现场爆破震动实测,数值模拟和理论分析,建立了频繁爆破震动作用下钢筋混凝土构件和整体结构的疲劳损伤模型,研究了频繁爆破震动作用下,结构位移、应力,刚度变化的规律。研究表明,频繁爆破震动作用下,构件所产生的损伤要大于结构整体产生的损伤;框架结构的最薄弱部位为结构顶层楼板以及结构底层边柱顶端。该研究可以为露天矿山控制爆破和近矿建筑的结构设计提供参考。
Blast is a conventional technique for mining,but adjacent structures of mines are often damaged by blasting vibration,therefore,durability and safety of structures are affected.A three-floor frame structure on the top of an open pit mine is studied by numerical simulation and theoretical analysis.Fatigue damage models of structural members and structure under frequent blasting vibration are established.The laws of displacement、stress、stiffness are also analyzed.The results showed that the values of damage of structural members are bigger than that of structure under frequent blasting vibration,and the most weak places of the frame structure is the top floor and the top of the side column at the first floor.The results obtained can provide theoretical foundation for blasting control of open pit mine and structure design on adjacent structures of mines.
Blast is a conventional technique for mining,but adjacent structures of mines are often damaged by blasting vibration,therefore,durability and safety of structures are affected.A three-floor frame structure on the top of an open pit mine is studied by numerical simulation and theoretical analysis.Fatigue damage models of structural members and structure under frequent blasting vibration are established.The laws of displacement、stress、stiffness are also analyzed.The results showed that the values of damage of structural members are bigger than that of structure under frequent blasting vibration,and the most weak places of the frame structure is the top floor and the top of the side column at the first floor.The results obtained can provide theoretical foundation for blasting control of open pit mine and structure design on adjacent structures of mines.
引文
[1]中国工程爆破协会.GB6722—2003爆破安全规程[S].北京:中国标准出版社,2004.
[2]孙秀民,汪进玉.爆破振动对建筑物的影响评价研究[J].爆破,2008,25(2):73-77.
[3]魏文晖,卢哲安.爆破地震波作用下框架结构与地基共同工作的非线性动力分析[J].世界地震工程,2004,20(2):95-99.
[4]龙晓鸿,潘玲,李黎.爆破地震波作用下框架结构与地基基础协同工作时程分析[J].工程抗震与加固改造,2007,29(6):46-50.
[5]张华其,张松新,周华杰,等.爆破振动对周边建筑物的影响[J].爆破,2007,24(2):98-101.
[6]王时越.弹性模量对混凝土疲劳性能的影响[J].昆明理工大学学报,2001,26(5):18-20.
[7]Tepfers R,Kutti T.Fatigue Strength of Plain,Ordinary and Lightweight Concrete[J].ACI J,1979,76(5):635-652.
[8]Wei Jun,Wu Xing-hao,Zhao Xiao-long.A Damage Model of Concrete Under Freeze-thaw Cycles[J].Journal of Wuhan Uni-versity of Technology:Master Sci Ed,2003,18(3):40-42.
[9]吕培印.混凝土单轴、双轴动态强度和变形试验研究[D].大连:大连理工大学,2001.
[10]Cornelissen H A W,Reinhardt H W.Uniaxial Tensile Fatigue Failure of Concrete Under Constant Amplitude and ProgramLoading[J].Mag of Concrete Research,1984,36(129):216-227.
[11]宋玉晋.混凝土结构的疲劳性能及设计原理[M].北京:机械工业出版社,2006.
[12]Gu Xianglin,Shen Zuyan.Damage Analysis on Reinforced Concrete Structures Under Earthquake Series[C]//Proceeding ofICCBE-VII.Seoul:Techno-Press,1997:1019-1024.
[2]孙秀民,汪进玉.爆破振动对建筑物的影响评价研究[J].爆破,2008,25(2):73-77.
[3]魏文晖,卢哲安.爆破地震波作用下框架结构与地基共同工作的非线性动力分析[J].世界地震工程,2004,20(2):95-99.
[4]龙晓鸿,潘玲,李黎.爆破地震波作用下框架结构与地基基础协同工作时程分析[J].工程抗震与加固改造,2007,29(6):46-50.
[5]张华其,张松新,周华杰,等.爆破振动对周边建筑物的影响[J].爆破,2007,24(2):98-101.
[6]王时越.弹性模量对混凝土疲劳性能的影响[J].昆明理工大学学报,2001,26(5):18-20.
[7]Tepfers R,Kutti T.Fatigue Strength of Plain,Ordinary and Lightweight Concrete[J].ACI J,1979,76(5):635-652.
[8]Wei Jun,Wu Xing-hao,Zhao Xiao-long.A Damage Model of Concrete Under Freeze-thaw Cycles[J].Journal of Wuhan Uni-versity of Technology:Master Sci Ed,2003,18(3):40-42.
[9]吕培印.混凝土单轴、双轴动态强度和变形试验研究[D].大连:大连理工大学,2001.
[10]Cornelissen H A W,Reinhardt H W.Uniaxial Tensile Fatigue Failure of Concrete Under Constant Amplitude and ProgramLoading[J].Mag of Concrete Research,1984,36(129):216-227.
[11]宋玉晋.混凝土结构的疲劳性能及设计原理[M].北京:机械工业出版社,2006.
[12]Gu Xianglin,Shen Zuyan.Damage Analysis on Reinforced Concrete Structures Under Earthquake Series[C]//Proceeding ofICCBE-VII.Seoul:Techno-Press,1997:1019-1024.
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