薄壁U形金属阻尼器剪切刚度计算分析
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摘要
通过建立有限元模型,对薄壁型U形金属阻尼器在水平荷载作用下的内力与变形进行了计算,并结合不同厚度U形阻尼器的力-位移曲线的特征,对阻尼器的内力分布与屈服过程进行分析,通过对比屈服前后的刚度,研究了U形金属阻尼器的刚度随其厚度及宽度的变化规律。结果表明,U形金属阻尼器的屈服开始于压弯段,屈服后其刚度退化较大;屈服前后阻尼器刚度均随厚度的增加而增加,且当厚度大于6 mm时,增加速度加快;当阻尼器厚度一定时,各刚度均随宽度增加而线性增加,刚度增加速度屈服前略快于屈服后。因此,在结构振动控制设计时应用薄壁U形金属阻尼器可根据刚度要求设置合理的厚度及宽度。
The internal force and deformation of the thin U-shape metal damper under horizontal load are calculated through the establishment of finite element model.Then the distribution of internal force and the yield course of the stiffness of the damper are analyzed in combining with the characters of curve of internal force and displacement of the U-shape dampers with different thickness.By contrast of stiffness before and after the yields,the stiffness transformation of U-shape metal damper in different thickness and width are studied.The research results indicate that the commencement of the yield of U-shape metal damper is at the zone of compress and bent and that after yield the stiffness degrades much,and the stiffness of damper before and after the yields increases with an increase in its thickness.When the thickness exceeds over 6 mm,the rate of enhance of stiffness is accelerated.When the thickness of damper is fixed,each stiffness increases linearly with an increase in width.The stiffness increasing rate prior to the yield is slightly faster than the stiffness posterior to the yield.Accordingly,when the structure vibration control is designed,the use of thin U-shape metal damper can be based on the rational thickness and width setting requirement by the stiffness.
The internal force and deformation of the thin U-shape metal damper under horizontal load are calculated through the establishment of finite element model.Then the distribution of internal force and the yield course of the stiffness of the damper are analyzed in combining with the characters of curve of internal force and displacement of the U-shape dampers with different thickness.By contrast of stiffness before and after the yields,the stiffness transformation of U-shape metal damper in different thickness and width are studied.The research results indicate that the commencement of the yield of U-shape metal damper is at the zone of compress and bent and that after yield the stiffness degrades much,and the stiffness of damper before and after the yields increases with an increase in its thickness.When the thickness exceeds over 6 mm,the rate of enhance of stiffness is accelerated.When the thickness of damper is fixed,each stiffness increases linearly with an increase in width.The stiffness increasing rate prior to the yield is slightly faster than the stiffness posterior to the yield.Accordingly,when the structure vibration control is designed,the use of thin U-shape metal damper can be based on the rational thickness and width setting requirement by the stiffness.
引文
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[2]卢俊龙,何明胜,田洁.填充墙MTMD减震结构优化参数分析[J].西安理工大学学报,2013,29(1):27-31.Lu Junlong,He Mingsheng,Tian Jie.Analysis of vibrationperformance and optimal parameter of in-filled wall MTMDstructure[J].Journal of Xi’an University of Technology,2013,29(1):27-31.
[3]滕军.结构振动控制与方法[M].北京:科学出版社,2009.
[4]李钢,李宏男.新型软钢阻尼器的减震性能研究[J].振动与冲击,2006,25(3):66-72,206-207.Li Gang,Li Hongnan.Study on vibration reduction struc-ture with a new type of mild metallic dampers[J].Journalof Vibration and Shock,2006,25(3):66-72,206-207.
[5]霍晓鹏.一种新型滑移隔震体系的理论分析与研究[D].西安:西安建筑科技大学,2007.Huo Xiaopeng.Theoretical analysis and research on a newkind of sliding base isolation system[D].Xi’an:Xi’anUniversity of Architecture and Technology,2007.
[6]姚谦峰.软钢U型带片的限位、消能性能分析[J].西安建筑科技大学学报,1997,29(1):22-26.Yao Qianfeng.Behavior of mild U-shaped steel plate re-training displacement and absorbing energy[J].Journal ofXi’an University of Architecture and Technology,1997,29(1),22-26.
[7]张智慧.滑移隔震结构滑移元件损伤的地震反应分析研究[D].西安:西安建筑科技大学,2010.Zhang Zhihui.The seismic response analysis of damagedslip component of sliding isolated structure[D].Xi’an:Xi’an University of Architecture and Technology,2010.
[8]邢书涛,郭迅.一种新型软钢阻尼器力学性能和减震效果的研究[J].地震工程与工程振动,2003,23(6):179-186.Xing Shutao,Guo Xun.Study on mechanical behavior andeffectiveness of a new type of mild steel damper[J].Earth-quake Engineering and Engineering Vibration,2003,23(6),179-186.
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