配筋对钢筋混凝土阻尼性能的影响
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摘要
采用混凝土的Kelvin阻尼模型和复阻尼模型,对钢筋混凝土阻尼参数进行了分析,推导得到了弹性阶段弯曲振动时钢筋混凝土阻尼性能的理论折减系数.研究了弯曲振动时钢筋混凝土损耗因子与配筋率、激励频率间的关系.结果表明:钢筋混凝土损耗因子随配筋率的增加和激励频率的提高而下降,且初始下降较快,而后渐趋平缓.将试验数据与理论折减系数进行对比分析,发现在配筋率较高时,理论折减系数与实测阻尼变化趋势接近,而在配筋率较低时,由于未考虑素混凝土的阻尼性能与激励频率的关系,两者间存在一定的偏差.
Damping parameters of material and structure are of great influence on structural response and damage.It is necessary to investigate the effects of steel bar on the damping behavior of reinforced concrete. On the basis of Kelvin damping model and complex damping model,the dynamical parameters analysis of material damping was carried out to obtain the theoretical reduction factor of damping capacity of the reinforced concrete when the reinforced concrete beam was on bending vibration in the elastic stage. The experimental investigation was carried out to study the relationships among loss tangent,excitation frequency and reinforcement ratio.The experimental results show that the loss tangent of material is decreased with the increasing reinforcement ratio and excitation frequency.The initial decrease is rapid,and then become smooth.In addition,the comparative analysis was done among experimental results,numerical results and theoretical reduction factor.It is found that the theoretical reduction factor is close to measured damping value when the reinforcement ratio is high.However,when the reinforcement ratio is low, there are some deviations between theoretical reduction factor and measured damping value due to ignoring the contribution of plain concrete materials.
Damping parameters of material and structure are of great influence on structural response and damage.It is necessary to investigate the effects of steel bar on the damping behavior of reinforced concrete. On the basis of Kelvin damping model and complex damping model,the dynamical parameters analysis of material damping was carried out to obtain the theoretical reduction factor of damping capacity of the reinforced concrete when the reinforced concrete beam was on bending vibration in the elastic stage. The experimental investigation was carried out to study the relationships among loss tangent,excitation frequency and reinforcement ratio.The experimental results show that the loss tangent of material is decreased with the increasing reinforcement ratio and excitation frequency.The initial decrease is rapid,and then become smooth.In addition,the comparative analysis was done among experimental results,numerical results and theoretical reduction factor.It is found that the theoretical reduction factor is close to measured damping value when the reinforcement ratio is high.However,when the reinforcement ratio is low, there are some deviations between theoretical reduction factor and measured damping value due to ignoring the contribution of plain concrete materials.
引文
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[11]樊海涛,何益斌,肖宏彬.钢筋混凝土建筑非线性阻尼性能及阻尼比表达式研究[J].地震工程与工程振动,2005,25(3): 85-90. FAN Hai-tao,HE Yi-bin,XIAO Hong-bin.Study on non-linear damping performance and damping ratio formula of reinforced concrete buildings[J].Earthquake Engineering and Engineering Vibration,2005,25(3):85-90.(in Chinese)
[2]OU Jin-ping,LIU Tie-jun,LI Ji-long.Dynamic and seismic property experiments of high damping concrete and its frame models[J].Journal of Wuhan University of Technology-Mater, 2008,23(1):1-6.
[3]柯国军,郭长青,胡绍全.混凝土阻尼比研究[J].建筑材料学报,2004,7(1):35-40. KE Guo-jun,GUO Chang-qing,HU Shao-quan.Study on the damping ratio of concrete[J].Journal of Building Materials, 2004,7(1):35-40.(in Chinese)
[4]欧进萍,刘铁军,梁超锋.复合纤维增强混凝土阻尼测试装置开发与试验研究[J].实验力学,2006,21(4):403-409. OU Jin-ping,LIU Tie-jun,LIANG Chao-feng.Development of damping measuring instrument and experimental research for hybrid fiber reinforced concretes[J].Journal of Experimental Mechanics,2006,21(4):403-409.(in Chinese)
[5]WEN Si-hai,CHUNG DDL.Enhancing the vibration reduction ability of concrete by using steel reinforcement and steel surface treatments[J].Cement and Concrete Research,2000, 30(2):327-330.
[6]石建军,胡绍全,柯国军.钢筋混凝土材料阻尼值的实验研究[J].四川建筑科学研究,2003,29(3):14-15. SHI Jian-jun,HU Shao-quan,KE Guo-jun.Experimental research on damping of reinforced concrete[J].Building Science ??Research of Sichuan,2003,29(3) U4-15.(in Chinese)
[7]文捷,王元丰.钢筋混凝土轴压构件材料阻尼计算及应用公式[J].振动与冲击,2007,26(6):14-16. WEN Jie,WANG Yuan-feng.Computation and formula for material damping of concrete components under axial cycle load[J].Journal of Vibration and Shock,2007,26(6):14-16. (in Chinese)
[8]RAZAK H A,CHOI F C.The effect of corrosion on the natural frequency and modal damping of reinforced concrete beams [J].Engineering Structures,2001,23(9):1126-1133.
[9]梁超锋,刘铁军.混凝土材料粘滞系数的测试技术及试验研究[J].混凝土,2008(3):45-47. LIANG Chao-feng,LIU Tie-jun.Testing technique and experimental research on concrete's viscous coefficient[J].Concrete, 2008(3):45-47.(in Chinese)
[10]梁超锋,欧进萍.结构阻尼与材料阻尼的关系[J].地震工程与工程振动,2006,26(1):49-55. LIANG Chao-feng,OU Jin-ping.Relationship between structural damping and material damping[J].Earthquake Engineering and Engineering Vibration,2006,26(1 ):49-55.(in Chinese)
[11]樊海涛,何益斌,肖宏彬.钢筋混凝土建筑非线性阻尼性能及阻尼比表达式研究[J].地震工程与工程振动,2005,25(3): 85-90. FAN Hai-tao,HE Yi-bin,XIAO Hong-bin.Study on non-linear damping performance and damping ratio formula of reinforced concrete buildings[J].Earthquake Engineering and Engineering Vibration,2005,25(3):85-90.(in Chinese)
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