摘要
提出一种施工性能优异的钢管混凝土冷却塔,并对其抗倒塌性能展开研究.首先,给出钢管混凝土冷却塔几何设计的计算公式;然后,利用有限元研究该冷却塔在不同缺口圆心角(删除支柱所对应的圆心角)下的倒塌原因及倒塌形态,从倒塌的难易程度、影响范围及动能大小三个方面对比了钢管混凝土和钢筋混凝土冷却塔的抗倒塌性能.研究结果表明:钢管混凝土冷却塔的倒塌主要由筒壁的局部失稳引起;仅当缺口圆心角超过126°时,冷却塔才会发生整体倒塌破坏;钢管混凝土冷却塔的抗倒塌性能优于钢筋混凝土冷却塔,即相对于钢筋混凝土冷却塔,钢管混凝土冷却塔开始发生倒塌时的缺口圆心角较大,倒塌过程中的动能峰值仅为钢筋混凝土冷却塔的1/10左右,且倒塌后的废墟尺寸较小.
A innovation concrete-filled steel tube cooling tower with excellent construction performance was proposed and its collapse resistance was studied.Firstly,the geometric design formula of concrete-filled steel tube cooling tower was studied.Then,the collapse cause and the collapse shape of the cooling tower under different notch center angles(the notch center angle corresponding to the deleted columns)were studied by FEM,and the collapse-resistance of the concrete-filled steel tube and the reinforced concrete cooling tower were compared in terms of the difficulty of collapse,the affected zone and size of kinetic energy.The results show that the collapse of concrete-filled steel tube cooling tower is mainly caused by local instability.Overall collapse of the cooling tower occurs only when the notch central angle exceeds 126°.The collapse-resistance performance of the concretefilled steel tube cooling tower is better than that of the reinforced concrete cooling tower,compared to the reinforced concrete cooling tower,the notch center angle of the concrete-filled steel tube cooling tower begins to collapse is larger,the peak kinetic energy during collapse is about 1/10 of the reinforced concrete cooling tower,and the affected zone caused by collapse are smaller.
作者
查晓雄
汪凯超
陈德劲
ZHA Xiaoxiong;WANG Kaichao;CHEN Dejing(School of Civil and Environmental Engineering,Harbin Institute of Technology,Shenzhen,Shenzhen 518055,Guangdong China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2024年第2期134-141,共8页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(52178129)
深圳市科技计划项目(GJHZ20200731095601006).
关键词
自然通风冷却塔
超大型
钢混凝土组合结构
抗倒塌性能
倒塌形态
natural draft cooling tower
large-scale:steel-concrete composite structure
collapse-resistance
collapse modes
