空间钢桁架-伞撑空冷支架结构体系抗震性能研究
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摘要
为研究空间钢桁架-伞撑空冷支架结构体系的抗震性能,选取轴对称原型结构的1/4,制作1/8缩尺比的试验模型,进行拟动力试验与拟静力试验,分析结构的裂缝开展过程、刚度退化、滞回曲线、骨架曲线以及滞回耗能。采用ABAQUS有限元分析软件对试验模型结构进行非线性地震响应分析,将计算得到的结构位移反应时程曲线及包络曲线与试验结果进行对比,验证了建模方法的合理性。建立原型结构的有限元分析模型,分析结构在不同强度地震作用下的基底剪力时程曲线、位移反应包络曲线以及管柱的损伤演化过程。试验与有限元分析结果表明:空间钢桁架-伞撑空冷支架结构的刚度退化较为缓慢,且在罕遇地震作用下具有较大的剩余刚度;滞回曲线比较饱满,在罕遇地震作用下滞回耗能相对于设防地震作用增幅较大,结构耗能能力较强;骨架曲线比较平缓,无明显拐点,结构在屈服后荷载无明显下降;位移角及结构损伤演化分析表明其变形能力较强,能够满足高烈度地区百万千瓦机组火电厂的抗震设防需求。
In order to study the seismic behavior of steel space truss-umbrella brace air-cooled condenser structure system,a 1 /8 scaled model generated from a 1 /4 substructure of axisymmetric prototype structure was constructed to conduct pseudo-dynamic test and quasi-static test. The crack propagation process,deterioration law of stiffness,hysteretic curve,skeleton curve and hysteretic energy dissipation curve were analyzed. Besides,ABAQUS finite element software was used to analyze the nonlinear earthquake response of the model structure,and the calculated displacement response time-history curves and displacement envelope curves were compared with the test results so as to verify the rationality of the modeling method. The finite element model of the prototype structure was established,and the base shear time-history curves,displacement envelope curves and evolutionary process of damage of pipe columns under different earthquake intensities were analyzed. The results from the test and the finite element analysis show that: the stiffness deterioration is rather slow,and enough surplus stiffness still exists under rare earthquake; the hysteretic curve is rather plump,and the amplification of hysteretic energy is huge under rare earthquake,which indicates that this structure has strong energy dissipation capacity; the skeleton curve is rather flat,without significant inflection point,and the bearing capacity decreases inconspicuously after yielding; displacement angel and damage analysis show that the deformability is strong,and this structure could satisfy the requirements of highly seismic regions in 1 000 MW unit thermal power plant.
In order to study the seismic behavior of steel space truss-umbrella brace air-cooled condenser structure system,a 1 /8 scaled model generated from a 1 /4 substructure of axisymmetric prototype structure was constructed to conduct pseudo-dynamic test and quasi-static test. The crack propagation process,deterioration law of stiffness,hysteretic curve,skeleton curve and hysteretic energy dissipation curve were analyzed. Besides,ABAQUS finite element software was used to analyze the nonlinear earthquake response of the model structure,and the calculated displacement response time-history curves and displacement envelope curves were compared with the test results so as to verify the rationality of the modeling method. The finite element model of the prototype structure was established,and the base shear time-history curves,displacement envelope curves and evolutionary process of damage of pipe columns under different earthquake intensities were analyzed. The results from the test and the finite element analysis show that: the stiffness deterioration is rather slow,and enough surplus stiffness still exists under rare earthquake; the hysteretic curve is rather plump,and the amplification of hysteretic energy is huge under rare earthquake,which indicates that this structure has strong energy dissipation capacity; the skeleton curve is rather flat,without significant inflection point,and the bearing capacity decreases inconspicuously after yielding; displacement angel and damage analysis show that the deformability is strong,and this structure could satisfy the requirements of highly seismic regions in 1 000 MW unit thermal power plant.
引文
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[2]白国良,朱丽华,赵春莲,等.工作荷载与地震作用下直接空冷结构体系模型试验研究[J].建筑结构学报,2008,29(5):42-49.(BAI Guoliang,ZHU Li hua,ZHAO Chunlian,et al.Model test on behavior of direct air cooled condenser support plat form under service load and earthquake action[J].Journal of Building Structures,2008,29(5):42-49.(in Chinese))
[3]姚泽良,白国良,党发宁,等.钢桁架-钢筋混凝土管柱结构抗震性能研究[J].建筑结构学报,2011,32(1):30-36.(YAO Zeliang,BAI Guoliang,DANG Faning,et al.Study on seismic behavior of a steel truss-reinforced concrete column structure[J].Journal of Building Structures,2011,32(1):30-36.(in Chinese))
[4]白国良,刘林,李晓文,等.空冷支架结构基于内容物的性能设计方法研究[J].建筑结构学报,2008,29(5):107-113.(BAI Guoliang,LIU Lin,LI Xiaowen,et al.Study on performance design method based on internal equipment of support structure system of air cooled condenser[J].Journal of Building Structures,2008,29(5):107-113.(in Chinese))
[5]JGJ 101—1996建筑抗震试验方法规程[S].北京:中国建筑工业出版社,1997.(JGJ 101—1996Specification for seismic testing methods of buildings[S].Beijing:China Architecture&Building Press,1997.(in Chinese))
[6]姚谦峰,陈平.土木工程结构试验[M].北京:中国建筑工业出版社,2001:123-125.(YAO Qianfeng,CHEN Ping.Civil engineering structural experiment[M].Beijing:China Architecture&Building Press,2001:123-125.(in Chinese))
[7]吴涛.大型火力发电厂钢筋混凝土框排架结构抗震性能及设计方法研究[D].西安:西安建筑科技大学,2003:50-51.(WU Tao.Study on seismic behavior and seismic design method of RC structure of large-scale thermal power plants[D].Xi’an:Xi’an University of Architecture and Technology,2003:50-51.(in Chinese))
[8]白国良,李红星,白涌滔,等.火电厂RC分散剪力墙-SRC框排架滞回性能试验研究与分析[J].土木工程学报,2011,44(8):59-65.(BAI Guoliang,LI Hongxing,BAI Yongtao,et al.Experimental study and analysis of the hysteretic behavior of the RC scattered shear wall-SRC frame-bent structures for thermal power plant[J].China Civil Engineering Journal,2011,44(8):59-65(in Chinese))
[9]王萌,石永久,王元清,等.强震作用下构件损伤对钢框架结构受力性能的影响[J].建筑结构学报,2012,33(10):94-101.(WANG Meng,SHI Yongjiu,WANG Yuanqing,et al.Effect of damage on steel frame mechanical behavior under severe earthquake[J].Journal of Building Structures,2012,33(10):94-101.(in Chinese))
[10]Lubliner J,Oliver J,Oller S,et al.A plastic-damage model for concrete[J].International Journal of Solids and Structures,2002,25(3):299-326.