屈曲约束支撑设计的刚度与强度准则
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摘要
目的为了达到屈曲约束支撑设计时的安全性和经济性,屈曲约束单元需要同时满足刚度和强度条件.方法采用弹性稳定理论,对带有侧向约束的理想轴心压杆和带有初始变形的屈曲约束支撑进行了分析.结果有侧向约束的理想轴心压杆的弹性屈曲荷载由轴心压杆与侧向约束单元屈曲荷载的和叠加而成.给出了在不同初始变形下进行屈曲约束支撑设计时,屈曲约束单元应该同时满足的刚度条件和强度条件.结论给出的屈曲约束支撑设计的强度和刚度条件的表达式可用以校核屈曲约束支撑设计的合理性.
In order to achieve safety and economization in designing a new type of buckling-restrained braces(BRBs),stiffness and strength criteria of the buckling-restraining element should be satisfied simultaneously.Based on the elastic stability theory,overall buckling criterion of BRBs was obtained through the analysis of a steel brace encased by concrete with debonding layer under axial compression.Taking into account the yielding of the axial core braces,both stiffness and strength design criteria for BRBs are given.The elastic buckling capacity of the composite brace can be considered as simply the sum of the contributions of the two separate parts.The stiffness and strength requirements of the buckling-restraining element should be considered as a pair in designing BRBs.Expressions of stiffness and strength design criteria can be used to verify the rationality of the design.
In order to achieve safety and economization in designing a new type of buckling-restrained braces(BRBs),stiffness and strength criteria of the buckling-restraining element should be satisfied simultaneously.Based on the elastic stability theory,overall buckling criterion of BRBs was obtained through the analysis of a steel brace encased by concrete with debonding layer under axial compression.Taking into account the yielding of the axial core braces,both stiffness and strength design criteria for BRBs are given.The elastic buckling capacity of the composite brace can be considered as simply the sum of the contributions of the two separate parts.The stiffness and strength requirements of the buckling-restraining element should be considered as a pair in designing BRBs.Expressions of stiffness and strength design criteria can be used to verify the rationality of the design.
引文
[1]Khatib I F,Mahin S A,Pister K S.Seismic behaviorof concentrically braced steel frames[R].ReportNo.UCB/EERC-88/01.Berkeley:Earthquake En-gineering Research Center.University of California,1988.
[2]Redwood R G,Channagiri V S,Earthquake-resist-ant design of concentrically braced steel frames[J].Canadian Journal of Civil Engineering,1991,18(5):839-850.
[3]Wakabayashi M,Nakamura T,Katagihara A,et al.Experimental study on the elasto-plastic behavior ofbraces enclosed by precast concrete panels under hor-izontal cyclic loading[C].Summaries of TechnicalPapers of Annual Meeting,Architectural Institute ofJapan,Tokyo:AIJ,1973,10:1041-1044.
[4]Wakabayashi M,Nakamura T,Katagihara A,et al.Experimental study on the elasto-plastic behavior ofbraces enclosed by precast concrete panels under hor-izontal cyclic loading[C]//Summaries of TechnicalPapers of Annual Meeting,Kinki Branch of the Ar-chitectural Institute of Japan.Tokyo:AIJ,1973,6:121-128.
[5]Fujimoto M,Wada A,Saeki E,et al.A study on theunbonded brace encased in buckling-restrainingconcrete and steel tube[J].Journal of Structural andConstruction Engineering,AIJ,1988,34B:249-258.
[6]谢强,赵亮.屈曲约束支撑的研究进展及其应用[J].钢结构,2006,21(1):46-48.
[7]Xie Q.State-of-the-art of buckling-restrainedbraces in Asia[J].Journal of Construction Steel Re-search,2005,61(6):727-748.
[8]谢强.槽钢无屈曲消能支撑:中国,2004201099707[P].2005-09-27.
[9]谢强.角钢无屈曲消能支撑:中国,2004201099694[P].2005-10-21.
[10]Watanabe A,Hitomi Y,Saeki E,et al.Properties ofbrace encased in buckling-restraining concrete andsteel tube[C]//Proc.of Ninth World Conf.onEarthquake Eng.,Japan:Tokyo,1988,IV:719-724.
[11]谢强,赵亮.屈曲约束支撑的研究进展及其在结构抗震加固中的应用[J].地震工程与工程振动,2006,26(3):100-103.
[12]谢强,赵亮.带有屈曲约束支撑双重结构体系的抗震性能[J].沈阳建筑大学学报:自然科学版,2008,24(2):221-225.
[2]Redwood R G,Channagiri V S,Earthquake-resist-ant design of concentrically braced steel frames[J].Canadian Journal of Civil Engineering,1991,18(5):839-850.
[3]Wakabayashi M,Nakamura T,Katagihara A,et al.Experimental study on the elasto-plastic behavior ofbraces enclosed by precast concrete panels under hor-izontal cyclic loading[C].Summaries of TechnicalPapers of Annual Meeting,Architectural Institute ofJapan,Tokyo:AIJ,1973,10:1041-1044.
[4]Wakabayashi M,Nakamura T,Katagihara A,et al.Experimental study on the elasto-plastic behavior ofbraces enclosed by precast concrete panels under hor-izontal cyclic loading[C]//Summaries of TechnicalPapers of Annual Meeting,Kinki Branch of the Ar-chitectural Institute of Japan.Tokyo:AIJ,1973,6:121-128.
[5]Fujimoto M,Wada A,Saeki E,et al.A study on theunbonded brace encased in buckling-restrainingconcrete and steel tube[J].Journal of Structural andConstruction Engineering,AIJ,1988,34B:249-258.
[6]谢强,赵亮.屈曲约束支撑的研究进展及其应用[J].钢结构,2006,21(1):46-48.
[7]Xie Q.State-of-the-art of buckling-restrainedbraces in Asia[J].Journal of Construction Steel Re-search,2005,61(6):727-748.
[8]谢强.槽钢无屈曲消能支撑:中国,2004201099707[P].2005-09-27.
[9]谢强.角钢无屈曲消能支撑:中国,2004201099694[P].2005-10-21.
[10]Watanabe A,Hitomi Y,Saeki E,et al.Properties ofbrace encased in buckling-restraining concrete andsteel tube[C]//Proc.of Ninth World Conf.onEarthquake Eng.,Japan:Tokyo,1988,IV:719-724.
[11]谢强,赵亮.屈曲约束支撑的研究进展及其在结构抗震加固中的应用[J].地震工程与工程振动,2006,26(3):100-103.
[12]谢强,赵亮.带有屈曲约束支撑双重结构体系的抗震性能[J].沈阳建筑大学学报:自然科学版,2008,24(2):221-225.
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