基于有效累积滞回耗能的钢筋混凝土构件承载力退化模型
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摘要
在模拟地震作用下建筑结构的非线性响应时,应正确考虑构件的累积损伤对结构性能的影响。钢筋混凝土构件在反复受力下的承载力退化是其累积损伤的重要体现。该文根据不同加载路径下钢筋混凝土柱的试验资料,通过考察不同加载路径对构件承载力退化的影响,指出累积滞回耗能引起的构件损伤程度,与产生该累积滞回耗能的位移幅值有关。基于这一结果,该文提出了有效累积滞回耗能的概念,以综合考虑累积滞回耗能和相应的位移幅值对承载力退化的影响。与试验结果的比较表明,有效累积滞回耗能与构件承载力退化程度之间有良好的相关性。分析结果表明,所建议的基于有效累积滞回耗能的承载力退化模型可较好地模拟不同往复加载路径下钢筋混凝土构件的滞回曲线。
In simulating the nonlinear seismic behavior of RC structures subjected to strong earthquake ground motions,it is necessary to take into account the accumulative damage of structural members,of which the strength deterioration is one of the most important aspects.By examining the influence of loading paths on the strength deterioration,it is shown that the extent of damage caused by a certain amount of hysteretic energy is dependent on the displacement amplitude at which the energy is dissipated.The effective hysteretic energy dissipation is then defined through combining the hysteretic energy dissipation with its corresponding displacement amplitude.It is proved by calibrating with available test data that the effective hysteretic energy dissipation has a good correlation with the extent of strength deterioration,and that the proposed strength deterioration model is effective in simulating the hysteretic behavior of reinforced concrete members subjected to various loading histories.
In simulating the nonlinear seismic behavior of RC structures subjected to strong earthquake ground motions,it is necessary to take into account the accumulative damage of structural members,of which the strength deterioration is one of the most important aspects.By examining the influence of loading paths on the strength deterioration,it is shown that the extent of damage caused by a certain amount of hysteretic energy is dependent on the displacement amplitude at which the energy is dissipated.The effective hysteretic energy dissipation is then defined through combining the hysteretic energy dissipation with its corresponding displacement amplitude.It is proved by calibrating with available test data that the effective hysteretic energy dissipation has a good correlation with the extent of strength deterioration,and that the proposed strength deterioration model is effective in simulating the hysteretic behavior of reinforced concrete members subjected to various loading histories.
引文
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[2]Roufaiel M S L,Meyer C.Analytical modeling ofhysteretic behavior of R/C frames[J].Journal ofStructural Engineering,1987,113(3):429―444.
[3]Kawashima Kazuhiko,Koyama Tatsuhiko.Effect ofnumber of loading cycles on dynamic characteristics ofreinforced concrete bridge pier columns[J].StructuralEngineering and Earthquake Engineering,JSCE,1988,5(1):183―191.
[4]Chung Young Soo,Meyer Christian,Masanobu,Shinozuku.Modeling of concrete damage[J].ACIStructural Journal,1989,86(3):259―271.
[5]Lai Shing-Sham,Will George T,Otani Shunsuke.Modelfor inelastic biaxial bending of concrete members[J].Journal of Structural Engineering,ASCE,1984,110(11):2563―2584.
[6]Youssef Maged,Ghobarah A.Strength deterioration dueto bond slip and concrete crushing in modeling ofreinforced concrete members[J].ACI Structural Journal,1999,96(6):956―968.
[7]Kunnath Sashi K,Reinhorn Andrei M,Park Young J.Analytical modeling of inelastic seismic response of R/Cstructures[J].Journal of Structural Engineering,ASCE,1990,116(4):996―1017.
[8]Mork K J.Response analysis of reinforced concretestructures under seismic excitation[J].EarthquakeEngineering and Structural Dynamics,1991,23(1):33―48.
[9]Ibarra Luis F.Global collapse of frame structures underseismic excitations[R].PEER Report,2005.
[10]Rahnama M,Krawinkler H.Effect of soft soils andhysteresis models on seismic design spectra[R]//John A.Blume Earthquake Engineering Research Center ReportNo.108,Department of Civil Engineering,StanfordUniversity,1993.
[11]Sucuoglu Haluk,Erberik Altug.Energy-based hysteresisand damage models for deteriorating systems[J].Earthquake Engineering and Structural Dynamics,2004,33(1):69―88.
[12]Kawashima Kazuhiko,Koyama Tatsuhiko.Effects ofcyclic loading hysteresis on dynamic behavior ofreinforced concrete bridge piers[J].StructuralEngineering and Earthquake Engineering,JSCE,1988,5(2):343―350.
[13]Takemura Hiroshi,Kawashima Kazuhiko.Effect ofloading hysteresis on ductility capacity of reinforcedconcrete bridge pier[J].Journal of StructuralEngineering,Japan,1997,43A:849―858.
[14]刘伯权,白绍良,徐云中,黄宗明.钢筋混凝土柱低周疲劳性能的试验研究[J].地震工程与工程振动,1998,18(4):82―89.Liu Boquan,Bai Shaoliang,Xu Yunzhong,HuangZongming.Experimental study of low-cycle behavior ofconcrete columns[J].Earthquake Engineering andEngineering Vibration,1998,18(4):82―89.(in Chinese)
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