离散单元法中杆段多弹簧模型的改进
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摘要
目的为应用离散单元法进行钢筋混凝土梁柱构件在一般荷载作用下的非线性反应分析,对杆段多弹簧模型进行改进.方法通过引入剪切弹簧,来传递单元之间的剪切力,剪切弹簧的本构关系采用二线型原点指向模型.并推导出弹簧组的力-位移关系与单元的运动方程.结果建立了完整的杆段多弹簧模型,并给出了剪切弹簧计算参数的确定方法.结论改进后的杆段多弹簧模型能够较好地描述钢筋混凝土梁柱构件压弯耦合以及剪切非线性性能.
In this paper,the segment-multi-spring model(SMSM)is improved so as to apply the distinct element method(DEM)to the nonlinear analysis of RC beams and columns under common load.The shearing force between the elements is transferred by introducing shear spring.The bilinear origin-oriented model is employed for the hysteresis model of the shearing spring.The force-displacement relationship of spring groups as well as the motion equation of elements is derived.A comprehensive SMSM is established and the analytic parameters of the shear spring are also determined.The improved SMSM can correctly simulate the axial-bending coupling performance as well as the shear nonlinear performance.
In this paper,the segment-multi-spring model(SMSM)is improved so as to apply the distinct element method(DEM)to the nonlinear analysis of RC beams and columns under common load.The shearing force between the elements is transferred by introducing shear spring.The bilinear origin-oriented model is employed for the hysteresis model of the shearing spring.The force-displacement relationship of spring groups as well as the motion equation of elements is derived.A comprehensive SMSM is established and the analytic parameters of the shear spring are also determined.The improved SMSM can correctly simulate the axial-bending coupling performance as well as the shear nonlinear performance.
引文
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[9]王强,吕西林,雷淑忠.离散单元法在钢筋混凝土构件非线性分析的应用[J].沈阳建筑大学学报:自然科学版,2005,21(2):91-95.
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[2]Cundall P A.A computer model for simulating pro-gressive large-scale movements in block rock sys-tems[C]//Nancy:Proceedings of the InternationalSymposium on Rock Fracture,1971.
[3]Utagawa N.Simulation of demolition of reinforcedconcrete buildings by controlled explosion[J].Micro-computers in Civil Engineering,1992,7(2):151-159.
[4]宣纲,顾祥林,吕西林.强震作用下混凝土框架结构倒塌过程的数值分析[J].地震工程与工程振动,2003,23(6):24-30.
[5]Kawai T,Toi Y.A discrete method of limit analysisand its applications to plastic stability problems ofstructural members[J].Engineering Structures,1983,5(1):38-44.
[6]Meguro K,Hakuno M.Fracture analyses of concretestructures by the modified distinct element method[J].Structural Engineering and Earthquake Engi-neering,1989,6(2):283-294.
[7]Tagel-din H,Meguro K.Applied element methodfor dynamic large deformation analysis of structures[J].Structural Engineering and Earthquake Engi-neering,2000,17(2):215-221.
[8]秦东.钢筋混凝土桥墩横向梁地震破坏与倒塌的计算机仿真[D].上海:同济大学土木工程学院,2000.
[9]王强,吕西林,雷淑忠.离散单元法在钢筋混凝土构件非线性分析的应用[J].沈阳建筑大学学报:自然科学版,2005,21(2):91-95.
[10]张令心,杨桦.剪力墙的剪切滞变模型[J].世界地震工程,1999,15(2):9-16.
[11]Linde P,Bachmann H.Dynamic modelling and designof earthquake-resistant walls[J].Earthquake Engi-neering and Structure Dynamic,1994,23(7):1331-1350.
[12]中华人民共和国建设部.混凝土结构设计规范(GB50010-2002)[S].北京:中国建筑工业出版社,2002.
[13]顾祥林,孙飞飞.混凝土结构的计算机仿真[M].上海:同济大学出版社,2002.
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