钢筋沥青隔震层位移控制研究
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摘要
介绍了钢筋沥青隔震层的基本构造和工作原理,利用结构力学知识对钢筋沥青隔震层极限水平位移进行理论分析,推导钢筋沥青隔震层在多遇、罕遇地震作用下其容许位移和二阶效应影响系数的计算公式;探讨钢筋沥青隔震层在不发生第二类失稳破坏时,对隔震竖向钢筋长径比及根数的要求,分析数据并拟合曲线,得到相关关系式。通过对多种工况下的隔震层试件进行振动台试验,研究钢筋沥青隔震层在不同隔震竖向钢筋直径和不同加速度幅值输入时的隔震层相对位移及动力特性。结果表明:理论分析与试验结果比较吻合,验证了钢筋沥青隔震层在多遇、罕遇地震作用下其容许位移的计算公式、二阶效应影响系数的计算公式和隔震竖向钢筋长径比与根数的关系式的可靠性。
The basic structure and working principle of steel-asphalt isolation layer are introduced. The theoretical analysis of the ultimate horizontal displacement of the isolation layer was conducted by using the knowledge of the structural mechanics. The calculation formulae of the steel-asphalt isolation layer' allowable displacement under frequent and severe earthquakes and the second-order influence coefficient were derived. In addition,the requirements on the slenderness ratio and numbers of the vertical bars were discussed to avoid the second kind of stability in the layer.Through data analysis and curve fitting,calculation formula for the relationship between slenderness ratio and numbers of the vertical bars were obtained. To study the displacement of the isolation layer and the dynamic characteristics,shaking table tests were carried out for the cases with different bar diameters and input acceleration amplitudes. The results show that the theoretical analyses agree well with the experimental results,thus verifying the reliability of the calculation formulae of steel-asphalt isolation layer' allowable displacement, the second-order influence coefficient, and the relationship between the length diameter ratio and its numbers of the vertical reinforcement.
The basic structure and working principle of steel-asphalt isolation layer are introduced. The theoretical analysis of the ultimate horizontal displacement of the isolation layer was conducted by using the knowledge of the structural mechanics. The calculation formulae of the steel-asphalt isolation layer' allowable displacement under frequent and severe earthquakes and the second-order influence coefficient were derived. In addition,the requirements on the slenderness ratio and numbers of the vertical bars were discussed to avoid the second kind of stability in the layer.Through data analysis and curve fitting,calculation formula for the relationship between slenderness ratio and numbers of the vertical bars were obtained. To study the displacement of the isolation layer and the dynamic characteristics,shaking table tests were carried out for the cases with different bar diameters and input acceleration amplitudes. The results show that the theoretical analyses agree well with the experimental results,thus verifying the reliability of the calculation formulae of steel-asphalt isolation layer' allowable displacement, the second-order influence coefficient, and the relationship between the length diameter ratio and its numbers of the vertical reinforcement.
引文
[1]尚守平.结构抗震设计[M].北京:高等教育出版社,2003
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[7]刘毅,朱爱萍,魏巍,等.考虑有侧移框架结构二阶效应的偏心距增大系数法的改进[J].建筑结构学报,2008,29(5):114-119(Liu Yi,Zhu Aiping,Wei Wei,et al.Improvement of moment amplification factor method considering second-order effect in lateral sway frame[J].Journal of Building Structures,2008,29(5):114-119(in Chinese))
[8]吕西林,朱玉华,施卫星,等.组合基础隔震房屋模型振动台试验研究[J].土木工程学报,2001,34(2):43-49(Lu Xilin,Zhu Yuhua,Shi Weixing,et al.Shaking tabletest on building models with comined isolation system[J].China Civil Engineering Journal,2001,34(2):43-49(in Chinese))
[9]尚守平,姚菲,刘可.一种新型隔震层的构造及其振动台试验研究[J].土木工程学报,2011,44(2):36-41(Shang Shouping,Yao Fei,Liu Ke.Study of the structure of a new type of isolation layer and shaking table test[J].China Civil Engineering Journal,2011,44(2):36-41(in Chinese))
[2]苏经宇,曾德民.我国建筑结构隔震技术的研究和应用[J].地震工程与工程震动,2001,21(4):94-101(Su Jingyu,Zeng Deimin.Research and application of seismic isolation of buildings in China[J].Earthquake Engineering and Engineering Dynamics,2001,21(4):94-101(in Chinese))
[3]李慧,杜永峰,屠锦敏,等.叠层橡胶垫基础隔震技术的研究[J].甘肃工业大学学报,1999,25(2):80-83(Li Hui,Du Yongfeng,Tu Jinmin,et al.Study of seismic isolation technique for building foundation with laminated rubber bearings[J].Journal of Gansu University of Technology,1999,25(2):80-83(in Chinese))
[4]刘文光,庄学真,周福霖,等.中国铅芯夹层橡胶隔震支座各种相关性能及长期性能研究[J].地震工程与工程振动,2002,22(1):114-120(Liu Wenguang,Zhuang Xuezhen,Zhou Fulin,et al.Dependence and durability properties of Chinese lead plug rubber bearings[J].Earthquake Engineering and Engineering Vibration,2002,22(1):114-120(in Chinese))
[5]尚守平,刘可,周志锦.农村民居隔震技术[J].施工技术,2009,38(2):97-99(Shang Shouping,Liu Ke,Zhou Zhijin.Seismic isolation technology of rural buildings[J].Construction Technology,2009,38(2):97-99(in Chinese))
[6]周志锦.一种钢筋-沥青复合隔震层研究[D].长沙:湖南大学,2009(Zhou Zhijin.The research on the steelasphalt isolation lay[D].Changsha:Hunan University,2009(in Chinese))
[7]刘毅,朱爱萍,魏巍,等.考虑有侧移框架结构二阶效应的偏心距增大系数法的改进[J].建筑结构学报,2008,29(5):114-119(Liu Yi,Zhu Aiping,Wei Wei,et al.Improvement of moment amplification factor method considering second-order effect in lateral sway frame[J].Journal of Building Structures,2008,29(5):114-119(in Chinese))
[8]吕西林,朱玉华,施卫星,等.组合基础隔震房屋模型振动台试验研究[J].土木工程学报,2001,34(2):43-49(Lu Xilin,Zhu Yuhua,Shi Weixing,et al.Shaking tabletest on building models with comined isolation system[J].China Civil Engineering Journal,2001,34(2):43-49(in Chinese))
[9]尚守平,姚菲,刘可.一种新型隔震层的构造及其振动台试验研究[J].土木工程学报,2011,44(2):36-41(Shang Shouping,Yao Fei,Liu Ke.Study of the structure of a new type of isolation layer and shaking table test[J].China Civil Engineering Journal,2011,44(2):36-41(in Chinese))
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