竖向不规则基础隔震结构抗连续倒塌机制研究
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摘要
为了研究竖向不规则基础隔震结构抗连续倒塌性能,文章建立典型的收进式竖向不规则钢筋混凝土基础隔震结构有限元模型,以备用荷载路径法为基础,采用竖向静力非线性Pushdown方法进行了分析,通过对备用荷载路径内力变化分析,研究了剩余结构抗连续倒塌性能。研究表明:除了角柱和角支座外,其他底层框架柱和隔震支座失效后其备用荷载路径均会经历梁机制、机制转换及悬链线机制3个阶段;隔震层较小的侧向约束,导致隔震支座失效后其备用荷载路径的悬链线机制难以充分发挥抗倒塌作用;初始失效位置的不同也会导致剩余结构抗连续倒塌性能的差异,对于结构中位置较为特殊的构件应予以专门设计和分析。
In order to study progressive collapse resistance of vertically irregular base-isolated structure,finite element models of typical vertically irregular reinforced concrete base-isolated structure are established.Based on the alternate load path method,progressive collapse resistance of the remaining structures is studied by using Pushdown method and analyzing the internal force change.The results show that the alternate load paths of all the columns and isolators except corner column and corner isolator will experience three stages:beam mechanism,mechanism transformation and catenary mechanism.Due to the small lateral restraint of isolation layer,catenary mechanism of alternate load path is difficult to give full play to its role as the resistance to collapse after isolator failure.The differences of initial failure location can also lead to the differences of the progressive collapse resistance.Components at special location in structure should be designed and analyzed specially.
In order to study progressive collapse resistance of vertically irregular base-isolated structure,finite element models of typical vertically irregular reinforced concrete base-isolated structure are established.Based on the alternate load path method,progressive collapse resistance of the remaining structures is studied by using Pushdown method and analyzing the internal force change.The results show that the alternate load paths of all the columns and isolators except corner column and corner isolator will experience three stages:beam mechanism,mechanism transformation and catenary mechanism.Due to the small lateral restraint of isolation layer,catenary mechanism of alternate load path is difficult to give full play to its role as the resistance to collapse after isolator failure.The differences of initial failure location can also lead to the differences of the progressive collapse resistance.Components at special location in structure should be designed and analyzed specially.
引文
[1]黄慎江,张雯.RC框剪结构考虑扭转的抗连续性倒塌的Pushover分析[J].安徽建筑大学学报,2016,24(4):8-12.
[2] ALASHKER Y,EL-TAWIL S.A design-oriented model for the collapse resistance of composite floors subjected to column loss[J].Journal of Constructional Steel Research,2011,67(1):84-92.
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[4]易伟建,水淼.基于节点冲切破坏的板柱结构连续倒塌可靠性分析[J].工程力学,2015,32(7):149-155.
[5]包超,张尚荣,马肖彤,等.不规则性对基础隔震结构抗连续倒塌性能影响研究[J].地震工程学报,2018,40(3):480-489.
[6]胡凯,蒋瓅,瞿革,等.钢筋混凝土结构连续倒塌机制研究[J].工程力学,2015,32(增刊1):83-90.
[7]熊进刚,吴赵强,邹园,等.钢筋混凝土空间框架结构抗连续倒塌机制研究[J].建筑结构,2013,43(9):105-108.
[8]朱奕锋,冯健,蔡建国,等.梅江会展中心张弦桁架抗连续倒塌分析[J].建筑结构学报,2013,34(3):45-53.
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[10]李易,陆新征,叶列平.基于能量方法的RC框架结构连续倒塌抗力需求分析Ⅱ:悬链线机制[J].建筑结构学报,2011,32(11):9-16.
[11] The US General Services Administration.Progressive collapse analysis and design guidelines for new federal office buildings and major modernization projects:GSA2003[S].Washington,D.C.:General Service Administration,2003:15-19.
[12] Department of Defense.Design of buildings to resist progressive collapse:DoD2005[S].Washington,D.C.:Department of Defense,2005:30-48.
[13] JIAN H,ZHENG Y.Simplified models of progressive collapse response and progressive collapse-resisting capacity curve of RC beam-column substructures[J].Journal of Performance of Constructed Facilities,2014,28(4):757-766.
[14] CHOI H,KIM J,CHOI H,et al.Progressive collapse resisting capacity of RC beam-column sub-assemblage[J].Magazine of Concrete Research,2011,63(4):297-310.
[15] LEE C H,KIM S W,LEE K K.Parallel axial-flexural hinge model for nonlinear dynamic progressive collapse analysis of welded steel moment frames[J].Journal of Structural Engineering,2009,136(2):165-173.
[16] USMANI A S,CHUNG Y C,TORERO J L.How did the WTC towers collapse:a new theory[J].Fire Safety Journal,2003,38(6):501-533.
[17] SeismoSoft.SeismoStruct:a computer program for static and dynamic nonlinear analysis of framed structures[CP/OL].Pavia,Itoly:SeismoSoft,2013.(2013-10-01)[2016-11-08].http://www.seismosoft.com.
[18]丁阳,宋骁然,师燕超,等.考虑节点影响的钢框架结构连续倒塌分析[J].建筑结构学报,2015,36(12):11-18.
[2] ALASHKER Y,EL-TAWIL S.A design-oriented model for the collapse resistance of composite floors subjected to column loss[J].Journal of Constructional Steel Research,2011,67(1):84-92.
[3]刘丽娜,徐勤,叶献国.中小学框架结构教学楼抗连续性倒塌分析[J].工程抗震与加固改造,2013,35(1):35-39.
[4]易伟建,水淼.基于节点冲切破坏的板柱结构连续倒塌可靠性分析[J].工程力学,2015,32(7):149-155.
[5]包超,张尚荣,马肖彤,等.不规则性对基础隔震结构抗连续倒塌性能影响研究[J].地震工程学报,2018,40(3):480-489.
[6]胡凯,蒋瓅,瞿革,等.钢筋混凝土结构连续倒塌机制研究[J].工程力学,2015,32(增刊1):83-90.
[7]熊进刚,吴赵强,邹园,等.钢筋混凝土空间框架结构抗连续倒塌机制研究[J].建筑结构,2013,43(9):105-108.
[8]朱奕锋,冯健,蔡建国,等.梅江会展中心张弦桁架抗连续倒塌分析[J].建筑结构学报,2013,34(3):45-53.
[9] REGAN P E.Catenary action in damaged concrete structures[J].Industrialized Concrete Construction,1975,48(9):191-224.
[10]李易,陆新征,叶列平.基于能量方法的RC框架结构连续倒塌抗力需求分析Ⅱ:悬链线机制[J].建筑结构学报,2011,32(11):9-16.
[11] The US General Services Administration.Progressive collapse analysis and design guidelines for new federal office buildings and major modernization projects:GSA2003[S].Washington,D.C.:General Service Administration,2003:15-19.
[12] Department of Defense.Design of buildings to resist progressive collapse:DoD2005[S].Washington,D.C.:Department of Defense,2005:30-48.
[13] JIAN H,ZHENG Y.Simplified models of progressive collapse response and progressive collapse-resisting capacity curve of RC beam-column substructures[J].Journal of Performance of Constructed Facilities,2014,28(4):757-766.
[14] CHOI H,KIM J,CHOI H,et al.Progressive collapse resisting capacity of RC beam-column sub-assemblage[J].Magazine of Concrete Research,2011,63(4):297-310.
[15] LEE C H,KIM S W,LEE K K.Parallel axial-flexural hinge model for nonlinear dynamic progressive collapse analysis of welded steel moment frames[J].Journal of Structural Engineering,2009,136(2):165-173.
[16] USMANI A S,CHUNG Y C,TORERO J L.How did the WTC towers collapse:a new theory[J].Fire Safety Journal,2003,38(6):501-533.
[17] SeismoSoft.SeismoStruct:a computer program for static and dynamic nonlinear analysis of framed structures[CP/OL].Pavia,Itoly:SeismoSoft,2013.(2013-10-01)[2016-11-08].http://www.seismosoft.com.
[18]丁阳,宋骁然,师燕超,等.考虑节点影响的钢框架结构连续倒塌分析[J].建筑结构学报,2015,36(12):11-18.