大型火电厂主厂房结构静力弹塑性分析及抗震性能评估
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摘要
主厂房结构是火力发电厂内重要构筑物,其抗震性能的好坏是评价整个主厂房结构设计优劣的重要标准.静力弹塑性分析,又称为Pushover分析,是实现基于性能抗震的重要手段,运用Pushover方法对某大型火电厂主厂房框排架结构进行分析.采用考虑高阶振型影响的侧向力加载模式,通过与反应谱分析结果的比较,证明了该加载模式可行,并运用弹塑性需求谱对分析结果进行评价.结果表明:结构满足"两阶段"的设计目标,在小震下处于弹性阶段并有一定的安全度,在大震下整体抗震性能良好,框排架能够协同工作,能实现"强柱弱梁"的预期目标,且保证重要构件处于弹性阶段不发生破坏,在纵向地震作用下,局部出屋面层为结构薄弱环节,设计时应加强抗震措施.
The main powerhouse is one of the most important structures in thermal power plants,of which the aseismic performance is the main standard to appraise the design of workshop structure.Three-dimensional finite element model of the main powerhouse is made by MIDAS/GEN to execute pushover analysis,which is means to carry out performance-based design.The structure’s aseismic performance is appraised by the demand spectrum,which is modified by the response spectrum in the frequent earthquake,according to the characteristics of the model of the lateral force.It is shown that the aseismic performance meets the requirements of the current aseismic code;failure mechanism is also ex-pounded.
The main powerhouse is one of the most important structures in thermal power plants,of which the aseismic performance is the main standard to appraise the design of workshop structure.Three-dimensional finite element model of the main powerhouse is made by MIDAS/GEN to execute pushover analysis,which is means to carry out performance-based design.The structure’s aseismic performance is appraised by the demand spectrum,which is modified by the response spectrum in the frequent earthquake,according to the characteristics of the model of the lateral force.It is shown that the aseismic performance meets the requirements of the current aseismic code;failure mechanism is also ex-pounded.
引文
[1]白国良,楚留声,朱丽华.型钢混凝土框架静力非线性分析塑性铰参数研究[J].西安建筑科技大学学报,2007,30(6):756-761.
[2]汪梦甫,周锡元.关于结构静力弹塑性分析(Push-over)方法中的几个问题[J].结构工程师,2002,4:17-22.
[3]种讯,叶献国,吴本华.Pushover分析中侧向力分布形式的影响[J].工程力学,2001(增刊).
[4]叶列平,李琪.基于性能/位移的能力-需求曲线设计方法[C]//现代地震工程进展——全国地震工程会议论文集.南京:东南大学出版社,2003:430-435.
[5]叶献国.多层建筑结构抗震性能的近似评估——改进的能力谱方法[J].工程抗震,1998(4):10-14.
[6]易伟建,张海燕.弹塑性反应谱的比较及其应用[J].湖南大学学报(自然科学版),2005,32(2):42-45.
[2]汪梦甫,周锡元.关于结构静力弹塑性分析(Push-over)方法中的几个问题[J].结构工程师,2002,4:17-22.
[3]种讯,叶献国,吴本华.Pushover分析中侧向力分布形式的影响[J].工程力学,2001(增刊).
[4]叶列平,李琪.基于性能/位移的能力-需求曲线设计方法[C]//现代地震工程进展——全国地震工程会议论文集.南京:东南大学出版社,2003:430-435.
[5]叶献国.多层建筑结构抗震性能的近似评估——改进的能力谱方法[J].工程抗震,1998(4):10-14.
[6]易伟建,张海燕.弹塑性反应谱的比较及其应用[J].湖南大学学报(自然科学版),2005,32(2):42-45.
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