防屈曲支撑的工作机理及稳定性设计方法
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摘要
防屈曲支撑(BRBs)是一种兼具普通支撑和金属耗能阻尼器双重功能的新型支撑形式。虽然其概念简单明确,但是工作机理却较为复杂,而目前人们对此类支撑的本质工作机理还没有得到充分的认识,因此很难提出较为全面合理的构件稳定性设计方法。本文对防屈曲支撑的工作机理进行了剖析,比较了目前已有的构件整体稳定性设计方法并指出了其中存在的问题,进一步提出应重点考虑间隙、边界条件以及摩擦力等因素的"强度-刚度"整体稳定设计方法的观点;从理论上推导了支撑内芯屈服段与约束构件之间的局部挤压力计算公式,揭示了支撑构件局部失稳破坏的机理,并进一步提出应重点考虑内芯板件宽厚比、间隙以及局部约束条件三者相关关系的支撑构件局部稳定设计方法的观点。
Buckling-restrained braces(BRBs) are a new type of composite bracing members which can act as both conventional braces without buckling and metallic dampers.Although they are simple and clear in concept,they are complicated as for the working mechanism of such braces,so it is difficult to control their working behavior and to put forward reasonable stability design methods.This paper first probes the working mechanism of BRBs.Then comparisons are made between different overall stability design methods of which the disadvantages are pointed out and it is suggested that the effects of gap,boundary condition and friction force on the overall stability of BRB members should be taken into account on the basis of the strength and stiffness correlation theory.The theoretical formulas that determine the contact forces between the steel core and the outer restraining member are derived,which can explain the essential reason of local buckling failure of BRB members and it is also suggested that the correlation among width to thickness ratio of steel core member,gap and local restraining condition should be considered in the local stability design method.
Buckling-restrained braces(BRBs) are a new type of composite bracing members which can act as both conventional braces without buckling and metallic dampers.Although they are simple and clear in concept,they are complicated as for the working mechanism of such braces,so it is difficult to control their working behavior and to put forward reasonable stability design methods.This paper first probes the working mechanism of BRBs.Then comparisons are made between different overall stability design methods of which the disadvantages are pointed out and it is suggested that the effects of gap,boundary condition and friction force on the overall stability of BRB members should be taken into account on the basis of the strength and stiffness correlation theory.The theoretical formulas that determine the contact forces between the steel core and the outer restraining member are derived,which can explain the essential reason of local buckling failure of BRB members and it is also suggested that the correlation among width to thickness ratio of steel core member,gap and local restraining condition should be considered in the local stability design method.
引文
[1]?原章雄,宮井清忠,宮井一雄,等.フリブレ一ス方式の可s耐震壁その開発と?用設計例[J].建築技術,1974,271(3):139-150.
[2]Tadaharu Nagao,Sigeharu Takahashi.Astudy on the elasto-plastic behavior of unbonded composite bracing(part1)[J].Journal of Structuraland Construction Engineering,AIJ,1990,415(9):105-115.(in Japanese)
[3]Eiichiro Saeki,Yasushi Maeda,Hideji Nakamura,et al.Experimental study on practical-scale unbonded braces[J].Journal of Structural andConstruction Engineering,AIJ,1995,476(10):149-158.(in Japanese)
[4]Narihara Hiroyuki,Tsujita Osamu,Koetaka Yuji.The experimental study on buckling restrained braces(part1 and part2)[C]//Summaries ofTechnical Papers of Annual Meeting,AIJ.Japan:AIJ,2000.911-914.(in Japanese)
[5]Mamoru Iwata,Masatoshi Murai.Buckling-restrained brace using steel mortar planks:performance evaluation as a hysteretic damper[J].Earth-quake Engineering and Structural Dynamics,2006,35(14):1807-1826.
[6]Cameron Black,Nicos Makris,Ian Aiken.Component testing,stability analysis and characterization of buckling-restrained unbonded bracesTM[R].Technical Report:PEER2002/08,University of California,Berkeley,2002.
[7]Steve Merritt,Chia-Ming Uang,Gianmario Benzoni.Subassemblage testing of corebrace buckling-restrained braces[R].Technical Report:TR-2003/01,University of California,San Diego,2003.
[8]Tremplay R,Bolduc P,Neville R,et al.Seismic testing and performance of buckling-restrained bracing systems[J].Canadian Journal of CivilEngineering,2006,33:183-198.
[9]Ma N,Zhao J X,Wu B,et al.Full scale subassemblage test of all-steel buckling-restrained brace[C]//Proceeding of the 10th International Sym-posium on Structural Engineering for Young Expert,Beijing:Science Press,2008:949-954.
[10]赵俊贤.无黏结内藏钢板支撑剪力墙滞回性能试验及工作性能研究[D].哈尔滨:哈尔滨工业大学土木工程学院,2007.
[11]田俊.全钢防屈曲支撑的抗震性能[D].哈尔滨:哈尔滨工业大学土木工程学院,2007.
[12]贾明明,张素梅.抑制屈曲支撑滞回性能分析[J].天津大学学报,2008,41(6):736-744.
[13]程光煜,叶列平,许秀珍,等.防屈曲耗能钢支撑的试验研究[J].建筑结构学报,2008,29(1):31-39.
[14]Pornput Suriyamongkol,Kasai Kazubiko.Finite element analysis of buckling-restrained braces[C]//Summaries of Technical Papers of AnnualMeeting,AIJ,Japan:AIJ,2002.567-568.(in Japanese)
[15]Fujimoto M,Wada A,Saeki E,Watanabe A,Hitomi Y.Astudy on the unbonded brace encased in buckling-restraining concrete and steel tube[J].Journal of Structural and Construction Engineering,AIJ,1988,34B:249-258.(in Japanese)
[16]Watanabe A,Hitomi Y,Saeki E,et al.Properties of brace encased in buckling-restraining concrete and steel tube[C]//Proceeding of NinthWorld Conference on Earthquake Engineering,Tokyo-Kyoto:1988,Ⅳ:719-724.
[17]Kazuo Inoue,Shinichi Sawaizumi,Yasuo Higashibata,et al.Bracing design criteria of the reinforced concrete panel including unbonded steel di-agonal braces[J].Journal of Structural and Construction Engineering,AIJ,1992,432(2):41-49.(in Japanese)
[18]Kazuo Inoue,Shinichi Sawaizumi,Yasuo Higashibata.Stiffening requirements for unbonded braces encased in concrete panels[J].Journal ofStructural Engineering,ASCE,2001,127(6):712-719.
[19]蔡克銓,蕭博謙.實尺寸三層樓挫屈束制支g CFT柱構架?動?試驗行為與分析[R].研究報告:NCREE-05-001,國家地震工程研究中心,台湾,2005.
[20]Masatoshi Murai,Fumioki Kobayashi,Takahiro Noda,et al.Experimental study on buckling-restrained braces using steel mortar planks[J].Journal of Structural and Construction Engineering,AIJ,2003,569(7):105-110.(in Japanese)
[21]李妍.防屈曲支撑的抗震性能及子结构试验方法[D].哈尔滨:哈尔滨工业大学土木工程学院,2007.
[22]Hirota Minoru,Morino Shosuke,Shimokawa Hiroumi,et al.Elasto-plastic behavior of flat-bar brace stiffened by square steel tube(part 9)[C]//Summaries of Technical Papers of Annual Meeting,AIJ,Japan:AIJ,2002.561-562.(in Japanese)
[23]Fumioki Kobayashi,Masatoshi Murai,Yohji Izumita,et al.Experimental study on buckling-restrained braces using steel mortar planks(part2)[J].Journal of Structural and Construction Engineering,AIJ,2004,586(12):187-193.(in Japanese)
[24]Masatoshi Murai,Youhei Kaneki,Hishashi Nanno,et al.Buckling-restrained braces using high performance hard polyurethane foam[J].AIJJ.Technol.Des,2007,13(25):143-146.(in Japanese)
[25]Toshiro Suzuki,Toshiyuki Ogawa,Tomotaka Ogasawara.A study on inelastic buckling of circular tubes under axial compression with outer con-straints[J].Journal of Structural and Construction Engineering,AIJ,1994,458(4):137-143.(in Japanese)
[26]Kujirai Kouichi,et al.Experimental study on RC stiffening covers of unbonded braces(part1 and part2)[C]//Summaries of Technical Papersof Annual Meeting,AIJ,Japan,AIJ,1997:1067-1070.(in Japanese)
[2]Tadaharu Nagao,Sigeharu Takahashi.Astudy on the elasto-plastic behavior of unbonded composite bracing(part1)[J].Journal of Structuraland Construction Engineering,AIJ,1990,415(9):105-115.(in Japanese)
[3]Eiichiro Saeki,Yasushi Maeda,Hideji Nakamura,et al.Experimental study on practical-scale unbonded braces[J].Journal of Structural andConstruction Engineering,AIJ,1995,476(10):149-158.(in Japanese)
[4]Narihara Hiroyuki,Tsujita Osamu,Koetaka Yuji.The experimental study on buckling restrained braces(part1 and part2)[C]//Summaries ofTechnical Papers of Annual Meeting,AIJ.Japan:AIJ,2000.911-914.(in Japanese)
[5]Mamoru Iwata,Masatoshi Murai.Buckling-restrained brace using steel mortar planks:performance evaluation as a hysteretic damper[J].Earth-quake Engineering and Structural Dynamics,2006,35(14):1807-1826.
[6]Cameron Black,Nicos Makris,Ian Aiken.Component testing,stability analysis and characterization of buckling-restrained unbonded bracesTM[R].Technical Report:PEER2002/08,University of California,Berkeley,2002.
[7]Steve Merritt,Chia-Ming Uang,Gianmario Benzoni.Subassemblage testing of corebrace buckling-restrained braces[R].Technical Report:TR-2003/01,University of California,San Diego,2003.
[8]Tremplay R,Bolduc P,Neville R,et al.Seismic testing and performance of buckling-restrained bracing systems[J].Canadian Journal of CivilEngineering,2006,33:183-198.
[9]Ma N,Zhao J X,Wu B,et al.Full scale subassemblage test of all-steel buckling-restrained brace[C]//Proceeding of the 10th International Sym-posium on Structural Engineering for Young Expert,Beijing:Science Press,2008:949-954.
[10]赵俊贤.无黏结内藏钢板支撑剪力墙滞回性能试验及工作性能研究[D].哈尔滨:哈尔滨工业大学土木工程学院,2007.
[11]田俊.全钢防屈曲支撑的抗震性能[D].哈尔滨:哈尔滨工业大学土木工程学院,2007.
[12]贾明明,张素梅.抑制屈曲支撑滞回性能分析[J].天津大学学报,2008,41(6):736-744.
[13]程光煜,叶列平,许秀珍,等.防屈曲耗能钢支撑的试验研究[J].建筑结构学报,2008,29(1):31-39.
[14]Pornput Suriyamongkol,Kasai Kazubiko.Finite element analysis of buckling-restrained braces[C]//Summaries of Technical Papers of AnnualMeeting,AIJ,Japan:AIJ,2002.567-568.(in Japanese)
[15]Fujimoto M,Wada A,Saeki E,Watanabe A,Hitomi Y.Astudy on the unbonded brace encased in buckling-restraining concrete and steel tube[J].Journal of Structural and Construction Engineering,AIJ,1988,34B:249-258.(in Japanese)
[16]Watanabe A,Hitomi Y,Saeki E,et al.Properties of brace encased in buckling-restraining concrete and steel tube[C]//Proceeding of NinthWorld Conference on Earthquake Engineering,Tokyo-Kyoto:1988,Ⅳ:719-724.
[17]Kazuo Inoue,Shinichi Sawaizumi,Yasuo Higashibata,et al.Bracing design criteria of the reinforced concrete panel including unbonded steel di-agonal braces[J].Journal of Structural and Construction Engineering,AIJ,1992,432(2):41-49.(in Japanese)
[18]Kazuo Inoue,Shinichi Sawaizumi,Yasuo Higashibata.Stiffening requirements for unbonded braces encased in concrete panels[J].Journal ofStructural Engineering,ASCE,2001,127(6):712-719.
[19]蔡克銓,蕭博謙.實尺寸三層樓挫屈束制支g CFT柱構架?動?試驗行為與分析[R].研究報告:NCREE-05-001,國家地震工程研究中心,台湾,2005.
[20]Masatoshi Murai,Fumioki Kobayashi,Takahiro Noda,et al.Experimental study on buckling-restrained braces using steel mortar planks[J].Journal of Structural and Construction Engineering,AIJ,2003,569(7):105-110.(in Japanese)
[21]李妍.防屈曲支撑的抗震性能及子结构试验方法[D].哈尔滨:哈尔滨工业大学土木工程学院,2007.
[22]Hirota Minoru,Morino Shosuke,Shimokawa Hiroumi,et al.Elasto-plastic behavior of flat-bar brace stiffened by square steel tube(part 9)[C]//Summaries of Technical Papers of Annual Meeting,AIJ,Japan:AIJ,2002.561-562.(in Japanese)
[23]Fumioki Kobayashi,Masatoshi Murai,Yohji Izumita,et al.Experimental study on buckling-restrained braces using steel mortar planks(part2)[J].Journal of Structural and Construction Engineering,AIJ,2004,586(12):187-193.(in Japanese)
[24]Masatoshi Murai,Youhei Kaneki,Hishashi Nanno,et al.Buckling-restrained braces using high performance hard polyurethane foam[J].AIJJ.Technol.Des,2007,13(25):143-146.(in Japanese)
[25]Toshiro Suzuki,Toshiyuki Ogawa,Tomotaka Ogasawara.A study on inelastic buckling of circular tubes under axial compression with outer con-straints[J].Journal of Structural and Construction Engineering,AIJ,1994,458(4):137-143.(in Japanese)
[26]Kujirai Kouichi,et al.Experimental study on RC stiffening covers of unbonded braces(part1 and part2)[C]//Summaries of Technical Papersof Annual Meeting,AIJ,Japan,AIJ,1997:1067-1070.(in Japanese)
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