框架塔动力特性实验研究
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摘要
在对框架塔进行地震载荷或风载荷设计计算时,其动力特性值是非常重要的设计参数。建立了框架塔的实验模型,分别对框架塔模型与单塔模型的动力特性进行了实验研究,并对框架高度不变,只改变支承点位置对框架塔的影响进行了实验研究。结果表明:①框架塔是一个有机整体,其具有不同于单塔的动力特性,设计时必须综合考虑框架各因素的影响。②支撑点高度对框架塔的动力特性有较大的影响,随着支撑点高度的增加,框架塔的一阶频率略有增加,而塔顶振幅、二阶频率以及阻尼比均出现了较大幅度的下降。研究结果为框架塔的设计计算和工程改造提供了实验数据与技术支持。
The value of dynamic characteristics is an important design parameter for calculating the seismic loads or wind loads on the tower with frame.A test model has been established for framed tower,and the experimental investigation includes single tower and framed tower on the dynamical characteristics respectively.Furthermore,the influence of support position on the dynamical characteristics of framed tower has been investigated when keeping the height of frame unchanged.The results show that,① the tower and the frame should be regarded as the whole unit,which is different from single tower,and factors of frame must be considered synthetically in dynamical calculation.②support position has a great effect on the dynamical characteristics of framed tower.With the increasing of support position height,the first-order frequency has a bit increase.However,the amplitude on the top of the tower,the second-order frequency and the damping ratio will significantly decline.The results may provide test data and technical support for the design of framed tower.
The value of dynamic characteristics is an important design parameter for calculating the seismic loads or wind loads on the tower with frame.A test model has been established for framed tower,and the experimental investigation includes single tower and framed tower on the dynamical characteristics respectively.Furthermore,the influence of support position on the dynamical characteristics of framed tower has been investigated when keeping the height of frame unchanged.The results show that,① the tower and the frame should be regarded as the whole unit,which is different from single tower,and factors of frame must be considered synthetically in dynamical calculation.②support position has a great effect on the dynamical characteristics of framed tower.With the increasing of support position height,the first-order frequency has a bit increase.However,the amplitude on the top of the tower,the second-order frequency and the damping ratio will significantly decline.The results may provide test data and technical support for the design of framed tower.
引文
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[6]JB4710—2011,钢制塔式容器[S].
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[8]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(10):281-284.
[9]段振亚.框架塔设备动力特性的研究[D].天津:天津大学,2003.
[10]刘习军,贾启芬,张文德.工程振动与测试技术[M].天津:天津大学出版社,1999.
[2]王书旭,陈永明,秦泗平.置于框架塔器对框架的水平作用力计算及对塔体的局部稳定性探讨[J].压力容器,1999,15(3):41.
[3]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.
[4]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.
[5]曲文海.化工容器与化工设备实用手册[M].北京:化学工业出版社,2000.
[6]JB4710—2011,钢制塔式容器[S].
[7]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.
[8]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(10):281-284.
[9]段振亚.框架塔设备动力特性的研究[D].天津:天津大学,2003.
[10]刘习军,贾启芬,张文德.工程振动与测试技术[M].天津:天津大学出版社,1999.
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