多高层预应力钢结构索支撑-框架静力性能研究
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摘要
将预应力索支撑引入多高层钢结构,提出耗能预应力索支撑-框架结构,该结构体系能有效提高框架结构的抗侧能力和侧移延性,减小柱子计算长度,降低结构用钢量。利用有限元分析方法,分别对预应力索支撑-刚接框架、预应力索支撑-半刚接框架以及纯刚接框架进行静力性能分析,研究轴压比对三者的弹塑性发展、极限承载力、破坏机理、侧移刚度和侧移延性等方面的影响规律。研究表明,设置索支撑除增大框架抗侧刚度和提高极限承载力外,更重要的是提高侧移延性,改善破坏模式,且当外荷载去除或减小时使框架全部或者部分回到原始平衡位置,实现自复位。另外,随着轴压比的增大,三者抗侧承载力均降低,纯框架侧移延性降低,但索支撑-框架延性基本不受轴压比影响。
A new type of prestressed cable-braced energy-dissipation frame structure was proposed by adding prestressed cable brace to a high-rise building. This structure could improve lateral resistance and ductility of steel frame effectively,thus resulting in smaller calculation length of columns and less steel-consumption. By using finite element method,the static behavior of cable-braced rigid frame,cable-braced semi-rigid frame and steel frame was analyzed,and the influence law of axial compression ratio on their elastioplasticity behavior,ultimate bearing capacity,failure mechanism,lateral stiffness and ductility etc was studied. The results showed that cable brace could improve the lateral stiffness and bearing capacity of steel frame,more importantly,could also improve its lateral ductility,change failure model,and produce the self-centering function by tensioning frame back to the original location entirely or partly when the load was removed. In addition,with the increase of axial compression ratio,bearing capacities of the three type frames were all decreased,and the ductility of steel frame was also reduced.However,the ductility of cable-braced steel frame was not influenced by the axial compression ratio.
A new type of prestressed cable-braced energy-dissipation frame structure was proposed by adding prestressed cable brace to a high-rise building. This structure could improve lateral resistance and ductility of steel frame effectively,thus resulting in smaller calculation length of columns and less steel-consumption. By using finite element method,the static behavior of cable-braced rigid frame,cable-braced semi-rigid frame and steel frame was analyzed,and the influence law of axial compression ratio on their elastioplasticity behavior,ultimate bearing capacity,failure mechanism,lateral stiffness and ductility etc was studied. The results showed that cable brace could improve the lateral stiffness and bearing capacity of steel frame,more importantly,could also improve its lateral ductility,change failure model,and produce the self-centering function by tensioning frame back to the original location entirely or partly when the load was removed. In addition,with the increase of axial compression ratio,bearing capacities of the three type frames were all decreased,and the ductility of steel frame was also reduced.However,the ductility of cable-braced steel frame was not influenced by the axial compression ratio.
引文
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[12]于安林,赵宝成,李仁达,等.K形和Y形偏心支撑钢框架滞回性能试验研究[J].建筑结构,2010(4):9-12.
[13]牛海清,朱召泉.二阶效应对钢框架结构分析的影响[J].河海大学学报:自然科学版,2002(4):103-106.
[2]王新玲,关罡.强震作用下框架支撑结构的破坏机构及其极限荷载[J].世界地震工程,2000(2):79-82.
[3]Massood Mofid,Mehrdad Lotfollahi.On the Characteristics of New Ductile Knee Bracing Systems[J].Journal of Constructional Steel Research,2006,62:271-281.
[4]黄怡,王元清,石永久.支撑布置方式对多高层钢结构抗震性能的影响分析[J].钢结构,2005(5):46-49,26.
[5]Aydin E,Boduroglu M H.Optimal Placement of Steel Diagonal Braces for Upgrading the Seismic Capacity of Existing Structures and its Comparison with Optimal Dampers[J].Journal of Constructional Steel Research,2008,64:72-86.
[6]张爱林,张艳霞,刘学春.震后可恢复功能的预应力钢结构体系研究展望[J].北京工业大学学报,2013(4):507-515.
[7]唐柏鉴,顾盛.预应力巨型支撑-钢框架结构侧移模式研究[J].建筑科学,2010(9):57-61.
[8]唐柏鉴,顾盛,马珺.预应力巨型支撑-钢框架结构中钢框架基础抗侧刚度研究[J].沈阳建筑大学学报:自然科学版,2012(2):215-220.
[9]沈超明,陈硕,杭振园,等.预应力巨型支撑-钢框架结构抗侧移性能研究[J].工程抗震与加固改造,2013(2):35-39.
[10]刘曙.钢框架抗侧力体系的试验研究[J].武汉理工大学学报,2008(3):83-85.
[11]钱稼茹,陈茂盛,张天申.偏心支撑钢框架在水平力作用下的试验研究和极限分析[J].建筑结构,1993(4):3-9.
[12]于安林,赵宝成,李仁达,等.K形和Y形偏心支撑钢框架滞回性能试验研究[J].建筑结构,2010(4):9-12.
[13]牛海清,朱召泉.二阶效应对钢框架结构分析的影响[J].河海大学学报:自然科学版,2002(4):103-106.
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