大跨度环形人行天桥支座刚度对基频的影响分析
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摘要
本文通过国内外规范对人行天桥基频的规定要求,进行了大跨度环形人行天桥基频影响因素分析与研究;对我国规范要求基频的合理性进行了分析,认为设计者会采取增加材料刚度或增加梁高等措施达到满足频率要求,这样可能造成成本的增加和材料的浪费。运用有限元方法对天桥支座刚度进行模拟分析与研究,对三种计算基频的方法和成果进行比较,认为设计中考虑支座刚度和基桩情况下的基频,比在一般支撑条件下和经验公式所得的基频更接近于实际工况要求。
According to the specifications and requirements of international and domestic pedestring overcrossing bridge fundamental frequency,influence factor analysis and research was conducted on long-span roundabout overhead bridge fundamental frequency in this paper;the reasonableness of fundamental frequency required in our country was analyzed.It was thought that designers would increase stiffness of materials or increase the depth of beam to meet the demands of frequency,which might lead to the cost increase and the waste of materials.By using finite element model to conduct simulation analysis and research on support stiffness of pedestrian,and making comparisons of three methods and results to calculate fundamental frequency.It was thought that when taking the support stiffness and foundation poles into consideration,fundamental frequency would be closer to actual requirements than those fundamental frequency calculated by experience or formula under normal supporting conditions.
According to the specifications and requirements of international and domestic pedestring overcrossing bridge fundamental frequency,influence factor analysis and research was conducted on long-span roundabout overhead bridge fundamental frequency in this paper;the reasonableness of fundamental frequency required in our country was analyzed.It was thought that designers would increase stiffness of materials or increase the depth of beam to meet the demands of frequency,which might lead to the cost increase and the waste of materials.By using finite element model to conduct simulation analysis and research on support stiffness of pedestrian,and making comparisons of three methods and results to calculate fundamental frequency.It was thought that when taking the support stiffness and foundation poles into consideration,fundamental frequency would be closer to actual requirements than those fundamental frequency calculated by experience or formula under normal supporting conditions.
引文
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[2]CEB-FIP Model Code 1990:Design Code[S].1993
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[4]GB 50017-2014钢结构设计规范[S]北京:中国建筑工业出版社.2014GB 50017-2014 Code for design of steel structure[S].Beijing:China Architectrue&Building Press.2014
[5]孙利民.闫兴非.人行桥人行激励振动及设计方法[J].同济大学学报.2004.32(8):996-999SUN Limin.YAN Xingfei.Human walking induced footbridge vibration and itsserviceability design[J].Jornal of Tongji Univernity.2004.32(8):996-999.(in Chinese)
[6]陈政清.华旭刚.人行桥的振动与动力设计[M].北京:人民交通出版社.2009CHEN Zhengqing.HUA Xugang.Vibration and dynamic design of footbridges[M].Beijing:People's Traffic Press,2009.(in Chinese)
[2]CEB-FIP Model Code 1990:Design Code[S].1993
[3]JTG D60-2004公路桥涵设计通用规范[S].北京:中华人民共和国交通部.2004JTG D60-2004 General Code for Design of Highway Bridges and Culverts[S].2004.Beijing:Ministry of Communications of the People's Republic of China
[4]GB 50017-2014钢结构设计规范[S]北京:中国建筑工业出版社.2014GB 50017-2014 Code for design of steel structure[S].Beijing:China Architectrue&Building Press.2014
[5]孙利民.闫兴非.人行桥人行激励振动及设计方法[J].同济大学学报.2004.32(8):996-999SUN Limin.YAN Xingfei.Human walking induced footbridge vibration and itsserviceability design[J].Jornal of Tongji Univernity.2004.32(8):996-999.(in Chinese)
[6]陈政清.华旭刚.人行桥的振动与动力设计[M].北京:人民交通出版社.2009CHEN Zhengqing.HUA Xugang.Vibration and dynamic design of footbridges[M].Beijing:People's Traffic Press,2009.(in Chinese)