石油化工框架式高塔结构动力响应分析
|
摘要
以某石油化工工程中的大长径比框架式高塔为对象,采用时程分析法,分析地震作用下设置限位导向支架的框架式高塔的结构响应,并与采用组合结构模型的框架塔进行对比分析。分析表明,设置限位导向支架的框架式高塔,塔体水平位移幅值变化具有时段性增大特征,最大塔顶位移比组合结构模型的框架塔增大约50%;地震作用将导致框架与塔之间产生振荡接触,接触产生的压力以脉冲方式作用到塔体上,并在塔体局部区域产生应力集中和应力幅值极速变化;框架塔的结构模型对塔体底部的应力变化和框架支座反力变化的稳定性影响不大。分析同时认为,设置限位导向支架的框架塔属于多体系结构,采用单一组合结构模型进行工程设计存在一定的安全隐患,建议在目前缺乏设计标准明确规定的条件下,地震作用分析宜采用时程分析法。
Taking a practical high framed-tower with large long-diameter ratio for petro-chemical project as the object,the structure response of high framed-tower with gap limiting support under the seismic effect was analyzed with timehistory analysis,whose results were compared with a combined structure model. The analysis indicated that the change in horizontal displacement of the high framed-tower with gap limiting support had the characteristics of increase in time step,max top displacement of tower was 50% greater than that of the high framed-tower of the combined structure model; and the seismic effect would also cause oscillation contact between tower and frame,and the pressure generated by the contact acted on the tower shell in mode of pulse force,which caused stress concentration in local area and a rapid change in stress amplitude. The type of structure model had low influence on stability of the stress variation of tower bottom and reaction variation of frame support. Based on the analysis,it could also be considered that the high framed-tower with gap limiting support was a multi-system structure. There would be some risks if taking single combined structure model to perform engineering design for a high framed-tower. Under the case of no determined stipulation of current design codes,use of time history analysis method was suggested for seismic effect.
Taking a practical high framed-tower with large long-diameter ratio for petro-chemical project as the object,the structure response of high framed-tower with gap limiting support under the seismic effect was analyzed with timehistory analysis,whose results were compared with a combined structure model. The analysis indicated that the change in horizontal displacement of the high framed-tower with gap limiting support had the characteristics of increase in time step,max top displacement of tower was 50% greater than that of the high framed-tower of the combined structure model; and the seismic effect would also cause oscillation contact between tower and frame,and the pressure generated by the contact acted on the tower shell in mode of pulse force,which caused stress concentration in local area and a rapid change in stress amplitude. The type of structure model had low influence on stability of the stress variation of tower bottom and reaction variation of frame support. Based on the analysis,it could also be considered that the high framed-tower with gap limiting support was a multi-system structure. There would be some risks if taking single combined structure model to perform engineering design for a high framed-tower. Under the case of no determined stipulation of current design codes,use of time history analysis method was suggested for seismic effect.
引文
[1]JB 4710—2005钢制塔式容器[S].
[2]段振亚,谭蔚,聂清德,等.框架塔动力特性的有限单元法研究[J].化工机械,2004,31(5):272-275.
[3]段振亚,李鹏飞,高攀,等.框架塔动力特性实验研究[J].石油化工设备,2012,41(3):1-4.
[4]谭蔚,段振亚,聂清德,等.框架塔自振频率的数值解法[J].世界地震工程,2006,22(1):124-128.
[5]段振亚.框架塔设备动力特性的研究[D].天津:天津大学,2003.
[6]王书旭,陈永明,秦泗平,等.置于框架塔器对框架的水平作用力计算及塔体的局部稳定性探讨[J].压力容器,1999(3):38-41.
[7]陆怡.框架式塔设备的设计[J].化工设备与管道,2004,41(1):14-18.
[8]金晓谦.钢框架内细高塔水平限位设计[J].石油化工设计,2013,30(2):17-19.
[9]洪建国.直立高塔与框架的水平荷载协同工作分析[J].化工设备设计,1993,30(1):12-19.
[10]柴田碧.化学づデソトの耐震设计[M].日本:丸善梯式会社,昭和61年.
[11]许志荣.高耸钢结构塔架的风荷载、地震作用分析[D].大庆:东北石油大学,2011:21-40.
[12]GB 50011—2010建筑抗震设计规范[S].
[2]段振亚,谭蔚,聂清德,等.框架塔动力特性的有限单元法研究[J].化工机械,2004,31(5):272-275.
[3]段振亚,李鹏飞,高攀,等.框架塔动力特性实验研究[J].石油化工设备,2012,41(3):1-4.
[4]谭蔚,段振亚,聂清德,等.框架塔自振频率的数值解法[J].世界地震工程,2006,22(1):124-128.
[5]段振亚.框架塔设备动力特性的研究[D].天津:天津大学,2003.
[6]王书旭,陈永明,秦泗平,等.置于框架塔器对框架的水平作用力计算及塔体的局部稳定性探讨[J].压力容器,1999(3):38-41.
[7]陆怡.框架式塔设备的设计[J].化工设备与管道,2004,41(1):14-18.
[8]金晓谦.钢框架内细高塔水平限位设计[J].石油化工设计,2013,30(2):17-19.
[9]洪建国.直立高塔与框架的水平荷载协同工作分析[J].化工设备设计,1993,30(1):12-19.
[10]柴田碧.化学づデソトの耐震设计[M].日本:丸善梯式会社,昭和61年.
[11]许志荣.高耸钢结构塔架的风荷载、地震作用分析[D].大庆:东北石油大学,2011:21-40.
[12]GB 50011—2010建筑抗震设计规范[S].
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心