摘要
提出一种直筒-锥段型钢结构冷却塔,并选取了混凝土冷却塔作为参照进行了比选研究,验证了钢结构冷却塔在技术上的可实现性和结构的可靠性,其成本和工期均较混凝土冷却塔少。为便于计算和工程应用,依据推导所得出的四边角钢格构式构件轴向、抗弯、剪切和抗扭刚度等计算式,针对性地提出了箱型薄壁单元的等效代换原理和计算方法,同时引出了相关系数对刚度进行修正,再利用有限元作进一步校核。研究发现,所提出的截面刚度等效代换精度较高,可满足工程精度需求。通过引入轴力负刚度,得到适用于一般空间结构的计算长度系数算式。
A new cylindrical-cone steel cooling tower was proposed,and the concrete cooling tower was selected as a reference for the comparison study,which verified the technical achievability and structural reliability of the steel cooling tower,the results showed that its cost and duration were less than the concrete cooling tower.The calculation formulae for the axial,flexural,shear and torsional stiffness of the four-sided angle steel lattice type members was derived,on which the equivalent substitution principle and calculation method of the box-type thin-walled units were proposed,and the correction coefficients of the stiffness parameters were optained,which were analyzed and calibrated by using the finite element model.The results showed that the equivalent substitution of cross-sectional stiffness proposed in the paper had high accuracy and could meet the requcrements of engineering accuracy.By introducing the negative stiffness of axial force,the formula of calculated length coefficient applicable to general space structures was obtained.
作者
潘亮
曹家豪
薛强
王凯
兰旭
王小良
PAN Liang;CAO Jiahao;XUE Qiang;WANG Kai;LAN Xu;WANG Xiaoliang(Infrastructure Department,Northwest Agriculture and Forestry University,Xianyang 712100,China;School of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;Prefabricated Steel Structure Research Institute Co.,Ltd.,of Xi’an Univ.of Arch.&Tech.,Xi’an 710055,China;Shaanxi Energy Linbei Power Generation Co.,Ltd.,Baoji 721000,China)
出处
《工业建筑》
北大核心
2023年第11期145-155,138,共12页
Industrial Construction
基金
国家自然科学基金资助项目(52178164)
住房和城乡建设部科学技术计划项目(2020-K-119)。
关键词
直筒-锥段型钢结构冷却塔
格构式构件
等效代换
负刚度
计算长度系数
cylindrical-cone steel cooling tower
lattice elements
equivalent substitution
negative stiffness
calculated length factor
