钢管混凝土框架-核心筒混合结构连续倒塌非线性动力分析
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摘要
为研究钢管混凝土框架-核心筒混合结构在局部构件失效后的连续倒塌机制,基于ABAQUS纤维梁单元和分层壳单元,采用课题组开发的材料本构子程序iFiberLUT,进行了一栋33层钢管混凝土框架-核心筒混合结构在1、17、33层柱和核心筒墙体失效工况下的连续倒塌非线性动力分析,研究了典型柱和剪力墙失效后剩余结构的抗连续倒塌机制。结果表明:33层构件失效时上部节点位移反应最大,17层次之,1层最小,相比核心筒墙体失效,柱失效时上部节点竖向位移更大,震荡更明显;各工况作用对核心筒影响均较小,且核心筒的存在增强了楼板的薄膜效应,提高了结构抗倒塌能力,失效位置距核心筒越近提高越显著;典型构件失效后结构的传力路径遵循"就近原则"向周围构件传递,楼板和核心筒有力的提高了结构的冗余传递路径和整体性。
This study aims to understand the progressive collapse mechanism of concrete-filled steel tubular(CFST) frame-core wall hybrid structures when local components are destroyed. Under the failure condition of columns and core walls on the 1 st, 17 th, and 33 rd floors, nonlinear dynamic analysis of a 33-story CFST frame-core wall hybrid structure is carried out based on ABAQUS fiber beam and multi-layer shell elements by using the material constitutive subroutine iFiberLUT. The anti-progressive collapse mechanism of the remaining structure is also studied. When the components are destroyed, the lowest displacement response of the upper node occurs on the 1 st floor, a larger displacement response occurs on the 17 th floor, and the largest one occurs on the 33 rd floor. Compared with that in the failure condition of the shear wall, the vertical displacement of the upper joints is greater and vibrations are more obvious when a column is destroyed. The influence of different working conditions on the core wall is weak, and the core wall enhances the film effect of the floor slab; it also improves the anti-progressive collapse capacity of the structure. Moreover, the path of inertial forces follows the "shortest path principle" when typical components are destroyed. The slab and core wall effectively improve the redundancy load path and integrity of the hybrid structures.
This study aims to understand the progressive collapse mechanism of concrete-filled steel tubular(CFST) frame-core wall hybrid structures when local components are destroyed. Under the failure condition of columns and core walls on the 1 st, 17 th, and 33 rd floors, nonlinear dynamic analysis of a 33-story CFST frame-core wall hybrid structure is carried out based on ABAQUS fiber beam and multi-layer shell elements by using the material constitutive subroutine iFiberLUT. The anti-progressive collapse mechanism of the remaining structure is also studied. When the components are destroyed, the lowest displacement response of the upper node occurs on the 1 st floor, a larger displacement response occurs on the 17 th floor, and the largest one occurs on the 33 rd floor. Compared with that in the failure condition of the shear wall, the vertical displacement of the upper joints is greater and vibrations are more obvious when a column is destroyed. The influence of different working conditions on the core wall is weak, and the core wall enhances the film effect of the floor slab; it also improves the anti-progressive collapse capacity of the structure. Moreover, the path of inertial forces follows the "shortest path principle" when typical components are destroyed. The slab and core wall effectively improve the redundancy load path and integrity of the hybrid structures.
引文
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[13] 混凝土结构设计规范:GB50010-2010[S].北京:中国建筑工业出版社,2010.Code for Design of Concrete Structures:GB50010-2010[S].Beijing:China Architecture & Building Press,2010.
[14] MENEGOTTO M,PINTO P E.Method of Analysis for Cyclically Loaded R C Plane Frames Including Changes in Geometry and Non-elastic Behavior of Elements under Combined Normal Force and Bending[C]//Proceeding of Symposium on the Resistance and Ultimate Deformability of Structures Acted on by Well Defined Repeated Loads.International Association for Bridge and Structural Engineering,Zurich,Switzerland.1973:15-22.
[15] GSA 2003.Progressive Collapse Analysis and Design Guidelines for New Federal Office Buildings and Major Modernization Projects[S].Washington D C:the U S General Services Administration.2003.
[2] 吴波,黄仕香,赵新宇.混凝土框剪结构的落层倒塌碰撞试验[J].工程力学,2012,29(6):176-187.WU Bo,HUANG Shixiang,ZHAO Xinyu.Experimatal Study on Pancake Collapse of RC Frame-shear Wall Structures[J].Engineering Mechanics,2012,29(6):176-187.
[3] 易伟建,何庆峰,肖岩.钢筋混凝土框架结构抗倒塌性能的试验研究[J].建筑结构学报,2007,28(5):104-109.YI Weijian,HE Qingfeng,XIAO Yan.Collapse Performance of RC Frame Structure[J].Journal of Building Structures,2007,28(5):104-109.
[4] SASANI M,BAZAN M,SAGIROGLU S.Experimental and Analytical Progressive Collapse Evaluation of Actual Reinforced Concrete Structure[J].ACI Structural Journal,2007,104(6):731-739.
[5] SASANI M.Response of a Reinforced Concrete Infilled-frame Structure to Removal of Two Adjacent Columns[J].Engineering Structures,2008,30(9):2478-2491.
[6] 陆新征,林旭川,叶列平,等.地震下高层建筑连续倒塌数值模型研究[J].工程力学,2010,27(11):64-70.LU Xinzheng,LIN Xuchuan,YE Lieping.Numerical Models for Earthquake Induced Progressive Collapse of High-rise Buildings[J].Engineering Mechanics,2010,27(11):64-70.
[7] WANG W D,LI H W,WANG J X.Progressive Collapse Ana-lysis of Concrete-filled Steel Tubular Column to Steel Beam Connections Using Multi-scale Model[J].Structures,2017,9:123-133.
[8] 王文达,王景玄,周小燕.基于纤维模型的钢管混凝土组合框架连续倒塌非线性动力分析[J].工程力学,2014,31(9):142-151.WANG Wenda,WANG Jingxuan,ZHOU Xiaoyan.Nonlinear Dynamic Progressive Collapse Analysis of Composite Frames with Concrete-filled Steel Tubular Columns Based on Fiber Model[J].Engineering Mechanics,2014,31(9):142-151.
[9] 韩林海.钢管混凝土结构——理论与实践[M].第三版.北京:科学出版社,2016.HAN Linhai.Concrete Filled Steel Tubular Structures:Theory and Practice[M].Third Edition.Beijing:Science Press,2016.
[10] 王文达,杨全全,李华伟.基于分层壳单元与纤维梁单元组合剪力墙滞回性能分析[J].振动与冲击,2014,33(16):142-149.WANG Wenda,YANG Quanquan,LI Huawei.Hysteresis Behavior Analysis of Composite Shear Walls Based on Layered Shell Elements and Fiber Beam Elements[J].Journal of Vibration and Shock,2014,33(16):142-149.
[11] MANDER J B,PRIESTLEY M J N,PARK R.Theoretical Stress-Strain Model For Confined Concrete[J].Journal of Structural Engineering,ASCE,1988,114(8):1804-1826.
[12] 沈聚敏,王传志,江见鲸.钢筋混凝土有限元与板壳极限分析[M].北京:清华大学出版社,1990.SHEN Jumin,WANG Chuanzhi,JIANG Jianjing.Finite Element Analysis of Reinforced Concrete and Plate and Shell Limit Analysis[M].Beijing:Tsinghua University Press,1990.
[13] 混凝土结构设计规范:GB50010-2010[S].北京:中国建筑工业出版社,2010.Code for Design of Concrete Structures:GB50010-2010[S].Beijing:China Architecture & Building Press,2010.
[14] MENEGOTTO M,PINTO P E.Method of Analysis for Cyclically Loaded R C Plane Frames Including Changes in Geometry and Non-elastic Behavior of Elements under Combined Normal Force and Bending[C]//Proceeding of Symposium on the Resistance and Ultimate Deformability of Structures Acted on by Well Defined Repeated Loads.International Association for Bridge and Structural Engineering,Zurich,Switzerland.1973:15-22.
[15] GSA 2003.Progressive Collapse Analysis and Design Guidelines for New Federal Office Buildings and Major Modernization Projects[S].Washington D C:the U S General Services Administration.2003.