型钢高强混凝土框架的循环退化效应
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摘要
进行了两跨三层型钢高强混凝土框架结构的单调加载和循环加载对比试验,观测了型钢高强混凝土框架结构各阶段性能随荷载循环次数的退化现象,获取了结构的荷载-位移滞回曲线。通过对比各荷载循环所对应的滞回环,分析了结构性能退化的规律,根据试验结果提出了描述结构强度和刚度退化的退化指数模型。通过对滞回曲线、功比系数、耗能比和粘滞阻尼系数的试验值与计算值进行对比,验证了模型的适用性与准确性。结果表明,该文所提出的循环退化模型可准确描述型钢混凝土框架在反复荷载作用下的材料非线性。该研究为型钢高性能混凝土框架结构的地震反应全过程分析奠定了基础。
Two steel reinforced high strength concrete (SRHSC) frames with two-bay and three-story were tested under a cyclic and monotonic load respectively. The structural performance deterioration was observed in the experiment, and the load-displacement hysteretic curve was obtained. The structural strength and stiffness deterioration were analyzed based on the tested hysteretic loops. To theoretically describe strength and stiffness deterioration, a deterioration index is proposed through fitting with experimental data. By comparing the testing results with calculating results for hysteretic curve, energy dissipation ratio as well as viscous damping coefficient, the applicability and accuracy of the proposed model was verified. The calculating results compared well with the testing results, indicating that the proposed model is capable of representing the material nonlinearity of the structure under cyclic loads. This research may be helpful for the seismic analysis of the SRHSC frame structure.
Two steel reinforced high strength concrete (SRHSC) frames with two-bay and three-story were tested under a cyclic and monotonic load respectively. The structural performance deterioration was observed in the experiment, and the load-displacement hysteretic curve was obtained. The structural strength and stiffness deterioration were analyzed based on the tested hysteretic loops. To theoretically describe strength and stiffness deterioration, a deterioration index is proposed through fitting with experimental data. By comparing the testing results with calculating results for hysteretic curve, energy dissipation ratio as well as viscous damping coefficient, the applicability and accuracy of the proposed model was verified. The calculating results compared well with the testing results, indicating that the proposed model is capable of representing the material nonlinearity of the structure under cyclic loads. This research may be helpful for the seismic analysis of the SRHSC frame structure.
引文
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[2]Sivaselvan M V,Reinhorn A M.Hysteretic models for deteriorating inelastic structure[J].Journal of Engineering Mechanics,ASCE,2000,126(6):633―640.
[3]Song J,Pincheira J.Spectral displacement demands of stiffness and strength degrading systems[J].Earthquake Spectra,2000,16(4):817―851.
[4]Krawinkler H,Zohrei M.Cumulative damage in steel structures subjected to earthquake ground motions[J].Computers&Structures,1983,16(1-4):531―541.
[5]Park Y J,Ang H S.Mechanics seismic damage model for reinforced concrete[J].Journal of Structural Engineering,ASCE,1985,111(4):722―739.
[6]杜修力,欧进萍.建筑结构地震破坏评估模型[J].世界地震工程,1991,7(3):52―58.Du Xiuli,Ou Jinping.Seismic damage model for building structures[J].World Earthquake Engineering,1991,7(3):52―58.(in Chinese)
[7]牛荻涛,任利杰.改进的钢筋混凝土双参数地震破坏模型[J].地震工程与工程振动,1996,16(4):44―54.Niu Ditao,Ren Lijie.A modified seismic damage model with double variables for reinforced concrete structures[J].Earthquake Engineering and Engineering Vibration,1996,16(4):44―54.(in Chinese)
[8]马永欣,郑山锁.结构试验[M].北京:科学出版社,2001.Ma Yongxin,Zheng Shansuo.Structural experiment method[M].Beijing:Science Press,2001.(in Chinese)
[9]郑山锁,曾磊,车顺利.用于型钢混凝土组合结构强度等级为C90的混凝土[P].中国:200710199123.2,2008-06-11.Zheng Shansuo,Zeng Lei,Che Shunli.C90concrete that applicable to steel reinforced concrete composite structure[P].China:200710199123.2,2008-06-11.(in Chinese)
[10]李忠献,张雪松,丁阳.削弱翼缘的型钢混凝土框架抗震性能研究[J].建筑结构学报,2007,28(4):18―24.Li Zhongxian,Zhang Xuesong,Ding Yang.Seismic behavior of steel reinforced concrete frames with reduced beam sections[J].Journal of Building Structure,2007,28(4):18―24.(in Chinese)
[11]Rahnama M,Krawinkler H.Effect of soils and hysteresis models on seismic design spectra[R].Stanford University:John A Blume Earthquake Engineering Research Center,Report No.108,1993.
[12]胡聿贤.地震工程学[M].北京:地震出版社,1988.Hu Yuxian.Earthquake engineering[M].Beijing:Earthquake Press,1988.(in Chinese)
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