基于框架元的新型混合结构地震扭转反应分析
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摘要
针对加钢支撑的新型钢-混凝土结构体系,建立基于框架元的有限元计算模型进行了动力性状分析。采用扭转耦联振型分解反应谱法进行了不同振型组合形式下单向和双向地震扭转效应分析。采用弹性时程分析法计算了不同地震波作用下的地震反应,并将计算结果与反应谱分析结果进行了对比分析。分析了钢支撑对结构动力行为的影响。结果表明,加钢支撑后结构的刚度明显增大,地震作用水平位移明显减小,主要受力构件的受力得到了改观,结构整体性能有所改善。扭转效应和振型耦合作用仍显著,建议采用扭转耦联振型分解反应谱法计算地震作用,可采用单向水平地震作用进行扭转效应分析,地震作用时基底剪力计算可直接采用反应谱法计算结果。
A calculation model of new steel-concrete hybrid structure system that added steel support members is established with finite element analysis software.Its dynamic behaviors are analyzed.Its unidirectional and bidirectional seismic torsion response under different mode compositions is analyzed with torsion couple and mode decomposition response spectrum analysis method.Its seismic response is analyzed with elastic time history analysis method by different seismic waves;its calculation results are compared with those of the response spectrum analysis method.The influence of the steel support members on the structural dynamic behaviors is analyzed.Results show that the structural stiffness is obvious increased because of the steel support members.Its horizontal displacement under seismic is obvious decreased.The mechanical behaviors of main mechanical member and the structural whole behaviors are bettered.Its torsion response and the couple of vibration modes are still obvious.It seismic action should be calculated with torsion couple and mode decomposition response spectrum analysis method.Its torsion response can be analyzed based on unidirectional horizontal seismic action.Its base bottom shear under seismic action can be valued based on the results of the response spectrum analysis method.
A calculation model of new steel-concrete hybrid structure system that added steel support members is established with finite element analysis software.Its dynamic behaviors are analyzed.Its unidirectional and bidirectional seismic torsion response under different mode compositions is analyzed with torsion couple and mode decomposition response spectrum analysis method.Its seismic response is analyzed with elastic time history analysis method by different seismic waves;its calculation results are compared with those of the response spectrum analysis method.The influence of the steel support members on the structural dynamic behaviors is analyzed.Results show that the structural stiffness is obvious increased because of the steel support members.Its horizontal displacement under seismic is obvious decreased.The mechanical behaviors of main mechanical member and the structural whole behaviors are bettered.Its torsion response and the couple of vibration modes are still obvious.It seismic action should be calculated with torsion couple and mode decomposition response spectrum analysis method.Its torsion response can be analyzed based on unidirectional horizontal seismic action.Its base bottom shear under seismic action can be valued based on the results of the response spectrum analysis method.
引文
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[2]Yao Zeliang,Bai Guoliang,Li Xiaowen,et al.Experiment and Numerical Simulation on Air Cooled Support Structure Proper-ties in Large Thermal Power Plant[C]//Proc 10th International Symposium on Structural Engineering for Young Experts,Changsha:[s.n.],2008:126-130.
[3]Guoliang Bai,Feng Tu.Experimental Study on Seismic Behavior of Reinforced Concrete Annular Section Columns[C]//9th In-ternational Symposium on Structure Engineering for Young Experts.Xiamen:[s.n.],2006:2258-2263.
[4]中华人民共和国国家标准.GB50009─2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001.
[5]胡聿贤.地震工程学[M].北京:地震出版社,1988.
[6]丰定国,王社良.抗震结构设计[M].武汉:武汉理工大学出版社,2003.
[7]胡文源,邹晋华.时程分析法中有关地震波选取的几个注意问题[J].南方冶金学院学报,2003,24(4):10-15.
[8]杨溥,李英民.结构时程分析法输入地震波的选择控制指标[J].土木工程学报,2000,33(6):23-28.
[9]Chandler A M,Mendis P A.Performance of Reinforced Concrete Frames Using Force and Displacement Based Seismic Assess-ment Methods[J].Engineering Structures,2000(22):352-363.
[10]杨溥,李英民.结构时程分析法输入地震波的选择控制指标[J].土木工程学报,2000,33(6):14-19.
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