带耗能腋撑型钢混凝土梁转换结构抗震性能参数分析
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摘要
带耗能腋撑型钢混凝土梁转换结构是新型的转换结构,通过试验研究验证该新型结构与普通型钢混凝土转换结构相比具有良好的耗能能力和抗震性能。采用有限元数值模拟方法,研究框架柱轴压比、转换梁托柱轴压比、腋撑设置位置、腋梁刚度比等设计参数对该新型结构抗震性能的影响。分析结果表明,在框架柱和托柱轴压比较大的结构中设置耗能腋撑,可以更加明显的改善结构的抗震性能。综合结构响应分析和腋撑变形耗能分析的结果,得出腋撑角度θ的最佳取值为30°～45°,腋撑端部距梁端距离a的最佳取值为Lb/6～Lb/5,腋梁刚度比Kh'的最佳取值为0.2～0.3。
Steel reinforced concrete(SRC) beam transfer structure with supplemental energy dissipation haunch brace(EDHB) is a new kind of transfer structure.Experimental investigations verified that the new type of transfer structure has good energy-dissipating capacity and better seismic performance,compared with normal SRC transfer structures.The influences of axial compression ratio of frame columns and columns supported by the transfer beam,arrangements of EDHB,stiffness ratio of EDHB to transfer beam(Kh′),on the seismic behaviors of this type of structure were studied by using the finite element method.Results show that the seismic behaviors of the transfer structure can be more significantly improved by adding EDHB when the axial compression ratios of the frame columns and columns supported by the transfer beam are relatively large.By summarizing the results of the structural responses and the deformation and energy dissipation of the haunch braces,the optimized design parameters of EDHB can be obtained,the haunch brace angle(θ) should be between 30 to 45 degree,the distance(a) from the haunch tip to the beam end should be kept at Lb/6-Lb/5,and Kh′ between 0.2 and 0.3.
Steel reinforced concrete(SRC) beam transfer structure with supplemental energy dissipation haunch brace(EDHB) is a new kind of transfer structure.Experimental investigations verified that the new type of transfer structure has good energy-dissipating capacity and better seismic performance,compared with normal SRC transfer structures.The influences of axial compression ratio of frame columns and columns supported by the transfer beam,arrangements of EDHB,stiffness ratio of EDHB to transfer beam(Kh′),on the seismic behaviors of this type of structure were studied by using the finite element method.Results show that the seismic behaviors of the transfer structure can be more significantly improved by adding EDHB when the axial compression ratios of the frame columns and columns supported by the transfer beam are relatively large.By summarizing the results of the structural responses and the deformation and energy dissipation of the haunch braces,the optimized design parameters of EDHB can be obtained,the haunch brace angle(θ) should be between 30 to 45 degree,the distance(a) from the haunch tip to the beam end should be kept at Lb/6-Lb/5,and Kh′ between 0.2 and 0.3.
引文
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[3]吴轶,何铭基,杨春,等.基于增量动力分析的带耗能腋撑钢筋混凝土转换结构抗震性能评估[J].地震工程与工程振动,2010,30(5):72-79(Wu Yi,He Mingji,Yang Chun,et al.Seismic performance of reinforcedconcrete transfer structure with energy dissipation haunchbrace based on incremental dynamic analysis[J].Earthquake Engineering and Engineering Vibration,2010,30(5):72-79(in Chinese))
[4]何铭基.带耗能腋撑型钢混凝土转换结构力学抗震性能研究[D].广州:广州大学,2010(He Mingji.Study onseismic behavior of steel reinforced concrete transferstructure with energy dissipation haunch brace[D].Guangzhou:Guangzhou University,2010(in Chinese))
[5]郑俊光.带耗能腋撑型钢混凝土梁转换结构抗震性能试验研究及设计方法初探[D].广州:广州大学,2011(Zheng Junguang.Experimental study on seismicperformances and preliminary study on design method ofsteel reinforced concrete beam transfer structure with energydissipation haunch brace[D].Guangzhou:GuangzhouUniversity,2011(in Chinese))
[6]Seismosoft.Seismostruct[EB/OL].Italy:Seismosoft,2012.http://www.seismosoft.com/en/SeismoStruct.aspx
[7]Martinez-Rueda J E,Elnashai A S.Confined concretemodel under cyclic load[J].Materials and Structures,1997,30(3):139-147
[8]Filippou F C,Popov E P,Bertero V V.Modeling of R/Cjoints under cyclic excitations[J].Journal of StructuralEngineering,1983,109(11):2666-2684
[9]Susantha K,Ge H,Usami T.Uniaxial stress-strainrelationship of concrete confined by various shaped steeltubes[J].Engineering Structures,2001,23(10):1331-1347
[10]El-Tawil S M,Deierlein G G.Fiber element analysis ofcomposite beam-column cross-sections[R].New York:Cornell University,1996
[11]钟善桐.钢管混凝土结构[M].北京:清华大学出版社,2003(Zhong Shantong.The concrete-filled steel tubularstructures[M].Beijing:Tsinghua University Press,2003(in Chinese))
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