覆冰作用下拉线式测风塔的极限承载力分析  

Analysis of the ultimate bearing capacity of the guyed met mast with iced action

作　　者：周道成 胡江辉[3] 梁思超 李玉刚 Zhou Daocheng;Hu Jianghui;Liang Sichao;Li Yugang(Northeast Forestry University,School Civil Engineering,Harbin Heilongjiang 150040,China;Huaneng Renewables Corporation Limited,Beijing 100036,China;Dalian University of Technology,Dalian Liaoning 116024,China)

机构地区：[1]东北林业大学,黑龙江哈尔滨150040 [2]华能新能源股份有限公司,北京100036 [3]大连理工大学,辽宁大连116024

出　　处：《山西建筑》2023年第12期1-5,26,共6页Shanxi Architecture

基　　金：黑龙江省重点研发项目:寒区桥梁河冰作用概率模型与动力效应(GZ20220101);华能新能源股份有限公司自立科技项目“拉线式测风塔凝冻倒塌实测与破坏机理研究(HNRKJ-2020-05)”资助。

摘　　要：结构的极限承载能力是分析结构破坏的重要参数,为了分析覆冰作用下拉线式测风塔的破坏特征,采用静力非线性方法对覆冰作用下拉线式测风塔极限承载能力进行了分析。为了合理考虑覆冰荷载作用下荷载作用工况,根据规范考虑基本风压的共同作用。根据风荷载和覆冰荷载的变化特征,假设结构静力非线性分析过程中基本风压保持不变,只考虑覆冰荷载的增加,但是由于覆冰厚度的逐步增加,迎风面积会增加,从而风荷载也逐步增加。如果在每一个荷载子步都采用投影法计算迎风面积,则计算量非常大,为了提高计算效率,因此提出了一种基于投影面的迎风面积的简便计算方法,可以方便计算结构静力非线性分析增量子步风荷载,快速实现覆冰作用下拉线式测风塔的静力非线性计算。在此基础上确定结构的极限承载能力,并分析了结构破坏特征,为结构合理设计提供参考。The ultimate bearing capacity of the structure is an important parameter for analyzing the failure of the structure.In order to analyze the failure characteristics of the guyed met mast under the iced action,the ultimate bearing capacity of the guyed met mast under the iced action is analyzed by the static nonlinear method in this paper.In order to reasonably consider the working conditions of the load under the action of the iced load,the joint action of the basic wind pressure is considered according to the specification.According to the variation characteristics of wind load and iced load,it is assumed that the basic wind pressure remains unchanged during the structural static nonlinear analysis,and only the increase of iced load is considered,but due to the gradual increase of icing thickness,the windward area will increase,and the wind load will also gradually increase.If the windward area is calculated using the projection method at each load sub-step,the amount of calculation is very large.Therefore,a simple calculation method based on the windward area of the projection surface is proposed,which can calculate the incremental sub-step wind loads for the structural static nonlinear analysis and realize quickly the static nonlinear calculation of the guyed met mast under the iced action.On this basis,the ultimate bearing capacity of the the guyed met mast is determined,and the failure characteristics of the structure are analyzed.These work provide reference for the reasonable design of the structure.

关 键 词：拉线式测风塔 静力非线性分析 极限承载能力 风荷载 覆冰荷载 

分 类 号：TU312.1[建筑科学—结构工程]