结构倒塌触地振动效应非线性预测方法研究
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摘要
拆除爆破已广泛应用在建筑物拆除施工中,但对于结构塌落体产生的触地振动效应,目前尚无成熟有效的预测和评价方法。本文运用非线性科学理论,建立了一个基于Volterra泛函级数的非线性预测模型,该模型可以在结构倒塌前即能预测塌落体触地诱发的触地振动效应,能够充分体现岩土介质在冲击载荷下的非线性力学响应特征。同时,针对Volterra非线性模型提出了基于独立脉冲荷载的简化识别方法。在实际工程中的应用表明,预测结果与实测结果吻合较好,并且应用简便,对预防和降低结构倒塌触地振动效应产生的危害具有一定的借鉴意义。
Demolition blasting has been widely used in the demolition of a building,but at present,about the touchdown vibration effects of structural collapse during demolition,there is no proven effective method of prediction and evaluation.Based on the theory of nonlinear science,a nonlinear prediction model based on Volterra functional series is created.The model can predict touchdown vibration effect induced by the collapsed building hitting superficial soil before the structural collapse.The model can fully reflect the nonlinear response characteristics of rock and soil media under the impact loading.At the same time,based on the nonlinear Volterra model of independent pulsed loads,a simplified identification method is put forward.The practical engineering application shows that the predictions and the measured results match well and the application of the model is simple.There is some significance to prevent and reduce the harm of vibration effects arisen from structural collapse hitting the ground.
Demolition blasting has been widely used in the demolition of a building,but at present,about the touchdown vibration effects of structural collapse during demolition,there is no proven effective method of prediction and evaluation.Based on the theory of nonlinear science,a nonlinear prediction model based on Volterra functional series is created.The model can predict touchdown vibration effect induced by the collapsed building hitting superficial soil before the structural collapse.The model can fully reflect the nonlinear response characteristics of rock and soil media under the impact loading.At the same time,based on the nonlinear Volterra model of independent pulsed loads,a simplified identification method is put forward.The practical engineering application shows that the predictions and the measured results match well and the application of the model is simple.There is some significance to prevent and reduce the harm of vibration effects arisen from structural collapse hitting the ground.
引文
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[12]吕淑然,胡刚,杨军.建筑物倒塌触地震动模拟研究[J].工程爆破,2002,8(3):16-19.(Lv Shuran,Hu Gang,Yang Jun.Simulation of the touchdown vibra-tion on collapsing of a building[J].Engineering Blas-ting,2002,8(3):16-19.(in Chinese))
[2]Wu Chengqing,Lu Yong,Hao Hong.Numerical pre-diction of blast-induced stress wave from large-scale un-derground explosion[J].International Journal for Nu-merical and Analytical Methods in Geomechanics,2004,28(1):93-109.
[3]Chen SG,Zhao J.A study of UDEC modelling for blastwave propagation in jointed rock masses[J].Interna-tional Journal of Rock Mechanics and Mining Science,1998,35(1):93-99.
[4]Liu YQ,Li HB,Zhao J.et al.UDEC simulation fordynamic response of a rock slope subject to explosions[J].International Journal of Rock Mechanics and Min-ing Science,2004,41(3).
[5]Ghosh.A.,Barkley.R.C.,Daman.J.K.Simulatedpredictor of ground vibration induced by blasting[A]//27th U.S.Symposium on rock mechanics[C].1986.
[6]Anderson.D.A.,Winaer.S.R,Ritter.A.P.Syntheticdelay versus frequency plots for predicting ground vibra-tion from blasting[A]//Proceeding 3rd Inter.Symp.oncomputer aided seismic analysis and discrimination[C],1983.
[7]Anderson D.A.,Ritter A.P.,Winzer S.R.et al.Amethod for site-specific prediction and control of groundvibration from blasting[A]//Proceeding 11th AnnualConference Explosives and Blast Technique[C].1985.
[8]K.G.Hinzen.Modelling of blast vibrations[J].Inter-national Journal of Rock Mechanics and Mining Science&Geomechanical Abstract,1988,25(6):439-445.
[9]Blair.D.P.The measurement,modelling and controlof ground vibration.2nd International Symposium onRock Fragmentation by Blast USA:Colorado,1987.
[10]David E.Siskind.Ground vibration effects on struc-ture.In:the 19th Annual.Symposium on Explosivesand Blasting Research,1998:1-2.
[11]周家汉,陈善良,杨业致,等.爆破拆除建筑物时震动安全距离的确定[J].爆破,1993,(增2):165-174.(Zhou Jiahan,Chen Shanliang,Yang Yezhi,etal.Determine vibration safety distances when blastingdemolition of buildings[J].Blasting,1993,(Supp.2):165-174.(in Chinese))
[12]吕淑然,胡刚,杨军.建筑物倒塌触地震动模拟研究[J].工程爆破,2002,8(3):16-19.(Lv Shuran,Hu Gang,Yang Jun.Simulation of the touchdown vibra-tion on collapsing of a building[J].Engineering Blas-ting,2002,8(3):16-19.(in Chinese))
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