基于宏观单元的结构非线性分析方法、算例及工程应用
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摘要
罕遇地震作用下结构和构件进入塑性阶段而会发生弹塑性损伤,正确的模拟结构进入非线性状态后的力学行为对评价结构的抗震安全性具有重要的意义。该文采用纤维单元及多弹簧单元等宏观单元对CFRP混凝土构件、预应力混凝土梁及剪力墙进行构件弹塑性分析,并与试验结果进行对比,表明宏观单元对混凝土构件弹塑性模拟的适用性。该文对采用纤维单元对足尺钢框架振动台试验进行数值分析,表明经过构件层次的力学行为校对后的纤维单元模型能准确预测结构在大震作用下的响应及倒塌前的破坏行为。通过大量算例结果和试验结果对比,说明基于宏观单元的非线性分析方法可以准确模拟整体结构与构件的非线性行为。最后通过两个工程实例说明了宏观单元可以应用于复杂工程整体结构非线性分析中,具有实际工程应用意义。
Structures and components may enter a nonlinear stage in a strong earthquake,and the precise prediction for the nonlinear behavior of structures in earthquakes is important to assess the earthquake resistant safety of the structures.In this paper,the nonlinear analysis based on a macroscopic element for different components such as CFRP concrete components,pre-stressed components and shear walls are carried out.The comparison between the analysis results and that of experiments indicated that the nonlinear analysis based on macroscopic elements can precisely simulate the nonlinear behavior of concrete components.The fiber element can also precisely simulate the nonlinear behavior of the whole structure,which is indicated through a numerical analysis of a shake-table test of a full scale steel frame.The feasibility of simulating the nonlinear behavior of the whole structure by macroscopic elements is verified through numerical comparisons between analysis results and experiments results.At last,the engineering applications indicate that a macroscopic element is practical in engineering.
Structures and components may enter a nonlinear stage in a strong earthquake,and the precise prediction for the nonlinear behavior of structures in earthquakes is important to assess the earthquake resistant safety of the structures.In this paper,the nonlinear analysis based on a macroscopic element for different components such as CFRP concrete components,pre-stressed components and shear walls are carried out.The comparison between the analysis results and that of experiments indicated that the nonlinear analysis based on macroscopic elements can precisely simulate the nonlinear behavior of concrete components.The fiber element can also precisely simulate the nonlinear behavior of the whole structure,which is indicated through a numerical analysis of a shake-table test of a full scale steel frame.The feasibility of simulating the nonlinear behavior of the whole structure by macroscopic elements is verified through numerical comparisons between analysis results and experiments results.At last,the engineering applications indicate that a macroscopic element is practical in engineering.
引文
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[12]National research institute for earth science and disaster prevention.Blind Analysis Contest2007results of the contest[Z].http://www.blind-anlaysis.jp/index_e.htm,appendix_e.pdf.2007-12-21.
[13]韩小雷,陈学伟,林生逸.基于纤维模型的超高层钢筋混凝土结构弹塑性时程分析[J].建筑结构,2010,40(2):13―16.Han Xiaolei,Chen Xuewei,Lin Shengyi.Elasto-Plastic time-history analysis of super high-risee RC structure based on fiber model[J].Building Structure,2010,40(2):13―16.(in Chinese)
[14]陈学伟,韩小雷,林生逸.中洲中心二期结构抗震性能分析[J].建筑结构学报,2010,31(2):43―51.Chen Xuewei,Han Xiaolei,Lin Shengyi.Performance-based seismic design of Zhongzhou Phrase II structure[J].Journal of Building Structures,2010,31(2):43―51.(in Chinese)
[2]McKenna F,Fenves G L.The OpenSEES Command Language Primer[R].USA:Earthquake Engineering Research Center,Berkeley,University of California,2000.
[3]Graham H Powell.A state of the art educational event performance based design using nonlinear analysis[R].Computers and Structures Inc.,2007.
[4]陈学伟,何伟球.基于OpenSEES的预应力混凝土构件弹塑性分析[J].工业建筑,2007(增刊):67―71.Chen Xuewei,He Weiqiu.Elasto-plastic analysis of prestressed concrete member in OpenSEES[J].Industrial Construction,2007(Supplement):67―71.(in Chinese)
[5]王正霖,简斌.两跨预应力混凝土连续梁的试验分析[J].土木工程学报,1999,32(2):25―30.Wang Zhenglin,Jian Bin.Experiments and analysis of two-span prestressed concrete continuous beams[J].China Civil Engineering Journal,1999,32(2):25―30.(in Chinese)
[6]Kabeyasawa T.US-Japan cooperative research on R/C full-scale building test,Part5:Discussion of dynamic response system[C].Proceeding of8th WCEE,USA:WCEE,1984.
[7]Vulcano A,Bertero V V.Analytical model for predicating the lateral response of RC shear wall:evaluation of their reliability[R].USA:EERC-87/19,1987.
[8]Fischinger M,Isakovi T.Benchmark analysis of structural wall[C].Proceeding of12th WCEE,New Zealand:WCEE,2000.
[9]韩小雷,陈学伟,戴金华.基于OpenSEES的剪力墙低周往复试验的数值分析[J].华南理工大学学报自然科学版,2008,36(12):7―12.Han Xiaolei,Chen Xuewei,Dai Jinhua.Numerical analysis for low-cyclic loading test of shear walls based on OpenSEES[J].Journal of South China University of Technology(Natural Science Edition),2008,36(12):7―12.(in Chinese)
[10]韩小雷,陈学伟,吴培烽.OpenSEES的剪力墙宏观单元的研究[J].世界地震工程,2008,24(4):76―81.Han Xiaolei,Chen Xuewei,Wu Peifeng.Research on the shear wall macro-element of OpenSEES[J].World Earthquake Engineering,2008,24(4):76―81.(in Chinese)
[11]韩小雷,陈学伟,郑宜.足尺钢框架振动台试验及动力弹塑性数值模拟[J].地震工程与工程振动,2008,28(6):134―141.Han Xiaolei,Chen Xuewei,Jack CHEANG.Dynamic experiment and numerical simulation of a full scale steel frame[J].Journal of Earthquake Engineering and Engineering Vibration,2008,28(6):134―141.(in Chinese)
[12]National research institute for earth science and disaster prevention.Blind Analysis Contest2007results of the contest[Z].http://www.blind-anlaysis.jp/index_e.htm,appendix_e.pdf.2007-12-21.
[13]韩小雷,陈学伟,林生逸.基于纤维模型的超高层钢筋混凝土结构弹塑性时程分析[J].建筑结构,2010,40(2):13―16.Han Xiaolei,Chen Xuewei,Lin Shengyi.Elasto-Plastic time-history analysis of super high-risee RC structure based on fiber model[J].Building Structure,2010,40(2):13―16.(in Chinese)
[14]陈学伟,韩小雷,林生逸.中洲中心二期结构抗震性能分析[J].建筑结构学报,2010,31(2):43―51.Chen Xuewei,Han Xiaolei,Lin Shengyi.Performance-based seismic design of Zhongzhou Phrase II structure[J].Journal of Building Structures,2010,31(2):43―51.(in Chinese)
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