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动力弹塑性和倒塌(III):地震差动作用下输电塔-线体系的弹塑性与倒塌分析

第x 卷第x 期《地震研究》Vol.37 No.1

摘要：首先，建立主塔高375m、主跨2756m的大跨越输电塔-线体系SAP2000有限元模型，采用第II部分工作（文献[1]）开发的接口程序SAP2ABAQUS生成为ABAQUS有限元模型。然后，明确给出长周期显式动力加载法实现重力作用下静力效果的加载过程，以完成的重力作用下索找形和初始刚度施加，最终实现重力分析与后续地震激励下动力加载的续接。进而，分别计算四类边界条件的结构体系的动力特性，并通过对转化前后模型的构件与结构模态分别进行对比，从而考察SAP2ABAQUS接口程序的转化精度。此外，更新升级自主开发的MEMS_b V2012.8 (Multiple Earthquake Motion Simulation_b Version 2012.8)至MEMS_b V2013.5，并生成多点地震动。最后，通过ABAQUS主程序链接第I部分工作（文献[2]）中开发的子程序进行弹塑性和倒塌分析，考虑大变形和差动输入。结果表明：（1）从实际工程角度验证了所开发接口程序SAP2ABAQUS的转化准确性与高效性。（2）从实际工程角度验证了所开发子程序的可行性与现实可靠性。（3）长周期动力加载法实现静力重力加载过程，理论严格合理、现实可行，克服了隐式静力重力方式加载与显式动力分析不续接问题。（4）从模态与理论分析两方面说明以四塔三线体系作为研究对象的必要性和可信性。（5）地震动的一致与差动输入对于构件塑性铰的出现与发展分布有显著影响，进一步说明多点地震动对于此类结构体系的地震弹塑性反应的必要性。
关键词：滞回模型；弹塑性； ABAQUS；UMAT；VUMAT
中图分类号：P315.9;U442   文献标识码：A     文章编号：

Abstract：Firstly, the 3D finite element model of a large-span transmission tower lines system with main tower height of 375m and main span of 2756m is established using software SAP2000, and is transformed to ABAQUS finite element model using the developed program SAP2ABAQUS addressed in the literature [1]. Then, the approach for using long-period dynamic loading method to achieve the static effect of gravity action is given explicitly and explained. By the approach, shape finding of cable and its initial stiffness are realized, which further make sure that the explicit dynamic analysis case can be performed subsequently after the gravity analysis case using software ABAQUS. Besides, the dynamic characters of four types of model with different boundary conditions are analyzed and compared, and the consistency between the SAP and ABAQUS finite model is analyzed to verify the transformation accuracy through program SAP2ABAQUS. Further, the program MEMS_b V2012.5 is updated to MEMS_b V2013.5 and the multi-point earthquake motions of target field are simulated. At last, the developed subroutine given in the literature [2] is used to analyze the elasto-plastic and collapse analysis of tower-lines system, considering geometric large deformation and multi-point earthquake motions. From the actual engineering analysis results, it can be shown that (1) the developed visual program SAP2ABAQUS is further verified to be have reliable accuracy and high efficiency transformation. (2) the developed subroutine is feasible and can be applied to analyze actual engineering. (3) the long-period dynamic loading method adopted in this paper is reasonable and feasible, and overcome the difficulty that the explicit dynamic analysis case can not be performed subsequently after the implicit gravity analysis case using software ABAQUS (4) From modal analysis and theory viewpoint, it shows the necessity and reliability of selecting four tower three lines system as analysis object. (5) he multi-point earthquake motions effect on the plastic hinges occurrence location, time and distribution of frame is not negligible. So, it is very necessary for researchers to consider the multi-point earthquake motions as input while analyzing the elasto-plastic responses of the similar structural system.
Key words：transmission-tower lines system; SAP2000; SAP2ABAQUS; shape finding of cable; multi-point earthquake motion; elasto-plasticity; collapse

引言

结论

参考文献(References)：
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