温度对钢筋混凝土简支梁模态频率影响机理的研究
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摘要
准确的模态频率测试是基于动力特性损伤识别的基础,而环境因素(特别是温度)会引起模态频率显著变化,造成损伤识别方法失效。文中以钢筋混凝土简支梁为研究对象,通过定量对比混凝土弹性模量、几何尺寸、边界条件、温度自应力变化对模态频率的影响程度,阐明了温度影响钢筋混凝土简支梁模态频率改变的内在机理。结果表明,混凝土弹性模量的温度依存性是造成模态频率变化的主要原因。
Accurate modal frequency testing is the basis of dynamic-based damage identification. However, environment factors(temperature in particular) has been widely demonstrated to produce significantly change in modal frequency that lead to the failure of damage identification techniques. In this paper, the reinforced concrete simply supported beam is selected as research object. The influence of change in concrete elasticity modulus, physical dimension, boundary condition, temperature self-restrained stress is comparatively analyzed. And the mechanism of temperature effect on modal frequency is clarified. The results show that temperature dependence of concrete elastic modulus is the most important reason causing the change of modal frequency.
Accurate modal frequency testing is the basis of dynamic-based damage identification. However, environment factors(temperature in particular) has been widely demonstrated to produce significantly change in modal frequency that lead to the failure of damage identification techniques. In this paper, the reinforced concrete simply supported beam is selected as research object. The influence of change in concrete elasticity modulus, physical dimension, boundary condition, temperature self-restrained stress is comparatively analyzed. And the mechanism of temperature effect on modal frequency is clarified. The results show that temperature dependence of concrete elastic modulus is the most important reason causing the change of modal frequency.
引文
[1] 朱宏平,余璟,张俊兵.结构损伤动力检测与健康监测研究现状与展望[J].工程力学,2011,28(2):1-11,17.
[2] 宗周红,牛杰,王浩.基于模型确认的结构概率损伤识别方法研究进展[J].土木工程学报,2012,45(8):121-130.
[3] 夏樟华,林友勤,张景杭,等.环境温度对连续箱梁刚构桥相对小波熵指标的影响研究[J].振动与冲击,2017,36(1):207-214.
[4] PEETERS B,DE ROECK G.One-year monitoring of the Z24-bridge:environmental effects versus damage events[J].Earthquake Engineering & Structural Dynamics,2001,30(2):149-171.
[5] 樊可清,倪一清,高赞明.大跨度桥梁模态频率识别中的温度影响研究[J].中国公路学报,2006,19(2):67-73.
[6] 李爱群,丁幼亮,费庆国,等.润扬大桥斜拉桥模态频率识别的环境变异性[J].东南大学学报(自然科学版),2007,37(2):245-250.
[7] XU Z D,WU Z.Simulation of the effect of temperature variation on damage detection in a long-span cable-stayed bridge[J].Structural Health Monitoring,2007,6(3):177-189.
[8] XIA Y,XU Y L,WEI Z L,et al.Variation of structural vibration characteristics versus non-uniform temperature distribution[J].Engineering Structures,2011,33(1):146-153.
[9] BALMèS é,BASSEVILLE M,BOURQUIN F,et al.Merging sensor data from multiple temperature scenarios for vibration monitoring of civil structures[J].Structural Health Monitoring,2008,7(2):129-142.
[10] 狄生奎,王立宪,杜永峰,等.考虑温度影响下的混凝土梁桥的模态参数识别研究[C].第18 届全国结构工程学术会议,广州:2009.
[11] 闵志华,孙利民.环境因素对混凝土结构特征参数影响的试验分析[J].同济大学学报(自然科学版),2011,39(12):1739-1745.
[12] JIAO Y B,LIU H B,WANG X Q,et al.Temperature effect on mechanical properties and damage identification of concrete structure[J].Advances in Materials Science and Engineering,2014,2014.
[13] 王贤强.温度影响下钢筋混凝土简支梁桥动力特性分析与损伤识别方法研究[D].长春:吉林大学,2017.
[14] 王向阳,林友杨,冉瑞江.SRP材料加固钢筋混凝土的抗爆性能研究[J].武汉理工大学学报(交通科学与工程版),2017,41(3):439-442.
[2] 宗周红,牛杰,王浩.基于模型确认的结构概率损伤识别方法研究进展[J].土木工程学报,2012,45(8):121-130.
[3] 夏樟华,林友勤,张景杭,等.环境温度对连续箱梁刚构桥相对小波熵指标的影响研究[J].振动与冲击,2017,36(1):207-214.
[4] PEETERS B,DE ROECK G.One-year monitoring of the Z24-bridge:environmental effects versus damage events[J].Earthquake Engineering & Structural Dynamics,2001,30(2):149-171.
[5] 樊可清,倪一清,高赞明.大跨度桥梁模态频率识别中的温度影响研究[J].中国公路学报,2006,19(2):67-73.
[6] 李爱群,丁幼亮,费庆国,等.润扬大桥斜拉桥模态频率识别的环境变异性[J].东南大学学报(自然科学版),2007,37(2):245-250.
[7] XU Z D,WU Z.Simulation of the effect of temperature variation on damage detection in a long-span cable-stayed bridge[J].Structural Health Monitoring,2007,6(3):177-189.
[8] XIA Y,XU Y L,WEI Z L,et al.Variation of structural vibration characteristics versus non-uniform temperature distribution[J].Engineering Structures,2011,33(1):146-153.
[9] BALMèS é,BASSEVILLE M,BOURQUIN F,et al.Merging sensor data from multiple temperature scenarios for vibration monitoring of civil structures[J].Structural Health Monitoring,2008,7(2):129-142.
[10] 狄生奎,王立宪,杜永峰,等.考虑温度影响下的混凝土梁桥的模态参数识别研究[C].第18 届全国结构工程学术会议,广州:2009.
[11] 闵志华,孙利民.环境因素对混凝土结构特征参数影响的试验分析[J].同济大学学报(自然科学版),2011,39(12):1739-1745.
[12] JIAO Y B,LIU H B,WANG X Q,et al.Temperature effect on mechanical properties and damage identification of concrete structure[J].Advances in Materials Science and Engineering,2014,2014.
[13] 王贤强.温度影响下钢筋混凝土简支梁桥动力特性分析与损伤识别方法研究[D].长春:吉林大学,2017.
[14] 王向阳,林友杨,冉瑞江.SRP材料加固钢筋混凝土的抗爆性能研究[J].武汉理工大学学报(交通科学与工程版),2017,41(3):439-442.
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