波纹钢腹板组合箱梁应力相关阻尼特性研究
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摘要
基于应力相关材料阻尼理论,选择波纹钢腹板组合箱梁这一新型钢、混组合桥梁结构,通过波纹钢板和钢筋混凝土的单位体积损耗因子,由能量法推导求得波纹钢腹板组合箱梁的损耗因子公式。结合有限元计算的各个单元的应力得到损耗因子,根据一个振动周期能量耗散相等原理,求得等效阻尼比,并将其与实测结果进行比较。分析结果表明:波纹钢腹板组合箱梁桥材料阻尼值不是一个固定值,它是随着应力水平的提高而增大。在自由振动和车辆荷载激励状态下,波纹钢腹板组合箱梁的等效阻尼比建议取为0.3%。提出的损耗因子公式和等效阻尼比的计算可为波纹钢腹板组合箱梁桥动力分析中阻尼的取值提供参考。
A box girder with corrugated steel webs is a new steel-concrete composite bridge structure.Based on the theory of stress-related material damping,using the unit volume dissipation factor of corrugated steel webs and reinforced concrete,the dissipation factor formula of a composite box girder with corrugated steel webs was deduced through the energy method.The dissipation factor was obtained by combining the stress of each element computed with the finite element method.The equivalent damping ratio was calculated according to the equal energy dissipation in one vibration cycle,and compared to the measured results.The analysis results showed that the material damping of the composite box-girder with corrugated steel webs is not a fixed value;it increases with increase in stress level;under free vibration and vehicle load excitation,the damping ratio of the composite box-girder with corrugated steel webs is suggested as 0.3%.The formula of dissipation factor and calculation of equivalent damping ratio here provided a reference for selecting damping value in dynamic analysis of composite box girder bridges with corrugated steel webs.
A box girder with corrugated steel webs is a new steel-concrete composite bridge structure.Based on the theory of stress-related material damping,using the unit volume dissipation factor of corrugated steel webs and reinforced concrete,the dissipation factor formula of a composite box girder with corrugated steel webs was deduced through the energy method.The dissipation factor was obtained by combining the stress of each element computed with the finite element method.The equivalent damping ratio was calculated according to the equal energy dissipation in one vibration cycle,and compared to the measured results.The analysis results showed that the material damping of the composite box-girder with corrugated steel webs is not a fixed value;it increases with increase in stress level;under free vibration and vehicle load excitation,the damping ratio of the composite box-girder with corrugated steel webs is suggested as 0.3%.The formula of dissipation factor and calculation of equivalent damping ratio here provided a reference for selecting damping value in dynamic analysis of composite box girder bridges with corrugated steel webs.
引文
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[14]董军,邓洪洲,王肇民.结构动力分析阻尼模型研究[J].世界地震工程,2000,16(4):63-69.
[2]李宏江,万水,叶见曙.波形钢腹板PC组合箱梁的结构特点[J].公路交通科技,2006,19(3):53-57.
[3]宋建永,纪伦,张树仁.波纹腹板钢梁的结构特点和受力性能[J].广西交通科技,2003,28(3):15-17.
[4]刘保东,陈海波,任宏伟.波纹钢腹板混凝土箱梁动力特性改善研究[J].中国铁道科学,2008,29(3):29-33.
[5]李鹏飞,刘保东,肖英楠.截面形式对波纹钢腹板桥梁动力特性的影响[J].北京交通大学学报,2010,34(3):122-125.
[6]Jeary A P.Damping in structure[J].Journal of WindEngineering and Industrial Acrodynamics,1997,72(1-3):345-355.
[7]张相庭.工程结构风荷载理论和抗风计算手册[M].上海:同济大学出版社,1990.
[8]Majka M,Hartnett M.Effects of speed,load and damping onthe dynamic response of railway bridges and vehicles[J].Computers and Structures,2008,86(6):556-572.
[9]王依群,王福智,温洪星.阻尼模型和取值对混合结构多遇地震时程分析的影响[C]//第14届全国结构工程会议论文集,2005.
[10]黄宗明,白绍良,赖明.结构地震反应时程分析中的阻尼问题评述[J].地震工程与工程振动,1996,16(2):95-105.
[11]颜海泉.地震作用下桥梁结构的阻尼建模[D].上海:同济大学,2008.
[12]Lazan B J.Damping of material and members in structuralmechanics[M].London:Pergamon Press,1968.
[13]文捷.钢筋混凝土及钢管混凝土材料阻尼研究[D].北京:北京交通大学,2006.
[14]董军,邓洪洲,王肇民.结构动力分析阻尼模型研究[J].世界地震工程,2000,16(4):63-69.
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