基于能量原理的钢筋混凝土烟囱P-Δ效应分析
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摘要
文章着重对高耸结构P-Δ效应的分析方法进行了研究。采用能量法进行钢筋混凝土烟囱的P-Δ效应分析,推导出顶点位移的公式。运用卡氏第一定理与最小势能原理,得出烟囱在风荷载下的结构顶点位移和底部附加弯矩。同时按照烟囱设计规范计算风荷载作用下底部附加弯矩,比较两种方法计算结果之间的差别。通过比较,可以反过来得出考虑烟囱结构刚度折减系数的合理值。
This paper focuses more attention on the analysis of P-Δ effect of skyscraping structures.Considering the impact of P-Δ effect,derive the formula of the apical displacement on the basis of energy method.By using the Castigliano's first theorem and minimum potential energy principle,the apical displacement and additional bending moment at the bottom can be obtained when the chimney under the action of wind load.Figure out the bottom additional bending moment under wind load based on criterion of chimney design,and compare the difference of results which derive from the two approaches.By comparison,the reasonable value of chimney stiffness reduction coefficient can be achieved.
This paper focuses more attention on the analysis of P-Δ effect of skyscraping structures.Considering the impact of P-Δ effect,derive the formula of the apical displacement on the basis of energy method.By using the Castigliano's first theorem and minimum potential energy principle,the apical displacement and additional bending moment at the bottom can be obtained when the chimney under the action of wind load.Figure out the bottom additional bending moment under wind load based on criterion of chimney design,and compare the difference of results which derive from the two approaches.By comparison,the reasonable value of chimney stiffness reduction coefficient can be achieved.
引文
[1]龙奴球,包世华.结构力学教程(Ⅱ).北京:高等教育出版社,2006.
[2]艾鹏.基于能量原理的通信单管塔效应分析方法研究[D].湖北:武汉理工大学硕士论文,2007.
[3]GB 50051-2002,烟囱设计规范[S].
[4]GB 50051-2002,烟囱设计规范[S].
[5]王秀逸,张平生.特种结构.武汉:地震出版社,1997.
[2]艾鹏.基于能量原理的通信单管塔效应分析方法研究[D].湖北:武汉理工大学硕士论文,2007.
[3]GB 50051-2002,烟囱设计规范[S].
[4]GB 50051-2002,烟囱设计规范[S].
[5]王秀逸,张平生.特种结构.武汉:地震出版社,1997.
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