近断层钢筋混凝土框架结构地震倒塌机制分析

PDF(2041 KB)

振动与冲击 ›› 2020, Vol. 39 ›› Issue (10) : 234-241.

论文

孙广俊，李鸿晶，卞开亚

作者信息 +

Analysis of seismic collapse mechanism of reinforced concrete frame structures subjected to near-fault ground motions

SUN Guangjun, LI Hongjing, BIAN Kaiya

Author information +

文章历史 +

摘要

由于近断层地震动的特殊性，近断层混凝土结构的损伤倒塌较一般地震动下更为严重，其损伤过程和倒塌机制也更为复杂。采用改进的拆除构件法，对抗倒塌分析中传统的拆除构件法进行了改进，并结合近断层地震动下混凝土框架结构的反应特征，建立了典型10层钢筋混凝土框架模型，通过设置12种拆除工况，选取3条简谐波和3条实际近断层地震记录作为结构输入，进行动力弹塑性时程分析，研究了钢筋混凝土框架在近断层地震作用下的倒塌机制。研究表明，底层框架柱损伤对结构倒塌模式的影响较大，中、上部楼层框架柱损伤对结构倒塌模式的影响较小；框架柱不对称损伤对所在楼层层间位移的影响大于对称损伤的影响，角柱损伤的影响大于边柱损伤和中柱损伤的影响；即使结构的损伤部位不同，但也可能具有相同的倒塌模式；采用与结构基本周期相接近的简谐波作用能够从总体上模拟结构的整体倒塌模式。

Abstract

Due to the special properties of near-fault earthquake ground motions, the damage and collapse of reinforced concrete (RC) structure subjected to near-fault ground motion are more serious than common ones, and the damage process and collapse mechanism are more complicated.In this paper, the traditional alternative path method for collapse analysis was modified firstly.Then, according to the response characteristics of RC frame subjected to near-fault earthquake ground motion, a finite element model of typical ten-story RC frame was established.Based on modified alternative path method, three harmonic excitations and three near-fault seismic records were selected as input for structure,and the dynamic elasto-plastic time history analysis was carried out respectively in twelve kinds of damage conditions.Finally, the collapse mechanism of RC frame under near-fault earthquake ground motions was studied.The results show that the damage of columns on ground floor has great influence on the final collapse mode and the damage of columns on middle and upper floor has little influence on the collapse mode.Damage of unsymmetrical arrangement columns has much more effect on inter-story displacement than that of symmetrical arrangement columns.Corner columns have much more effect than side columns, and side columns have much more effect than interior columns.The collapse mode of structure maybe the same even if the damage location is different.The whole collapse mode can be simulated approximately by using of harmonic excitation with period close to the basis period of structure.

导出引用

孙广俊，李鸿晶，卞开亚. 近断层钢筋混凝土框架结构地震倒塌机制分析[J]. 振动与冲击, 2020, 39(10): 234-241

SUN Guangjun, LI Hongjing, BIAN Kaiya . Analysis of seismic collapse mechanism of reinforced concrete frame structures subjected to near-fault ground motions[J]. Journal of Vibration and Shock, 2020, 39(10): 234-241

参考文献

[1] 易伟建, 何庆锋, 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 W J, He Q F, Xiao Y. Collapse performance of RC frame structure[J]. Journal of Building Structures, 2007, 28(5): 104-109. (in Chinese)

[2] 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.

[3] Sasani M, Kazemi A, Sagiroglu S, et al. Progressive collapse resistance of an actual 11-story structure subjected to severe initial damage[J]. Journal of Structural Engineering, 2011, 137(9): 893-902.

[4] Lu X, Lu X Z, Guan H, et al. Collapse simulation of reinforced concrete high-rise building induced by extreme earthquakes[J]. Earthquake Engineering and Structural Dynamics, 2013, 42(5): 705-723.

[5] 肖岩, 赵禹斌, 李凤武, 等. 钢筋混凝土大比例模型框架角柱突然失效模拟试验研究[J]. 自然灾害学报, 2013, 22(4): 75-81.

Xiao Y, Zhao Y B, Li F W, et al. Experimental research on a large scale RC frame model subjected to sudden corner column removal[J]. Journal of Natural Disasters, 2013, 22(4): 75-81. (in Chinese)

[6] 李凤武, 肖岩, 赵禹斌, 等. 钢筋混凝土框架边柱突然失效模拟试验与分析研究[J]. 土木工程学报, 2014, 47(4): 9-18.

Li F W, Xiao Y, Zhao Y B, et al. Experimental and analytical study on progressive collapse of RC frame with sudden side columns removal[J]. China Civil Engineering Journal, 2014, 47(4): 9-18. (in Chinese)

[7] Lew H S, Bao Y H, Pujol S, et al. Experimental study of reinforced concrete assemblies under column removal scenario[J]. ACI Structural Journal, 2014, 111(4): 881-892.

[8] Sagiroglu S, Sasani M. Progressive collapse-resisting mechanisms of reinforced concrete structures and effects of initial damage locations[J]. Journal of Structural Engineering, 2014, 140(3): 04013073.

[9] 韩小雷, 崔济东, 季静, 等. 强震作用下基于构件性能的钢筋混凝土框架结构抗倒塌能力评估[J]. 建筑结构学报, 2015, 36(12): 27-34.

Han X L, Cui J D, Ji J, et al. Component-performance-based collapse resistant capacity evaluation of reinforced concrete frame structures under strong earthquake actions[J]. Journal of Building Structures, 2015, 36(12): 27-34. (in Chinese)

[10] Li S, Zuo Z X, Zhai C H, et al. Shaking table test on the collapse process of a three-story reinforced concrete frame structure[J]. Engineering Structures, 2016, 118: 156-166.

[11] Verderame G M, Luca F D, Ricci P, et al. Preliminary analysis of a soft-story mechanism after the 2009 L'Aquila earthquake[J]. Earthquake Engineering and Structural Dynamics, 2011, 40(8): 925-944.

[12] Lu X Z, Ye L P, Ma Y H, et al. Lessons from the collapse of typical RC frames in Xuankou school during the great Wenchuan earthquake[J]. Advances in Structural Engineering, 2012, 15(1): 139-153.

[13] GB50010-2010 混凝土结构设计规范[S]. 北京: 中国建筑工业出版社, 2010.

GB50010-2010 Code for design of concrete structures[S]. Beijing: Building Industry Press of China, 2010. (in Chinese))

[14] 张莹, 孙广俊, 李鸿晶. 开洞填充墙对混凝土框架柱地震损伤影响分析[J]. 振动、测试与诊断, 2014, 34(5):932-937/981.

Zhang Y, Sun G, Li H. Numerical simulation on seismic damage of reinforced concrete frame columns considering the influence of infill walls with opening[J]. Journal of Vibration, Measurement and Diagnosis, 2014, 34(5):932-937/981.

[15] 李易, 陆新征, 叶列平. 钢筋混凝土框架抗连续倒塌机制研究[J]. 建筑科学, 2011, 27(5):12-18.

LI Y, LU X Z, YE L P. Study on the progressive collapse mechanism of RC frame structures[J]. Building Science, 2011, 27(5):12-18. (in Chinese)

[16] 温增平, 徐超, 陆鸣, 等. 汶川地震重灾区典型钢筋混凝土框架结构震害现象[J]. 北京工业大学学报, 2009, 35(6): 753-760.

Wen Z P, Xu C, Lu M, et al. Seismic damage of typical reinforced concrete frame structures in severe disaster-affected areas in Wenchuan earthquake[J]. Journal of Beijing University of technology, 2009, 35(6): 753-760. (in Chinese)