摘要
作为一种新颖的典型风敏感结构,直筒-锥段型钢结构冷却塔的动力特性和风致受力性能亟待研究。以国内拟建的某超大型钢结构冷却塔(189 m)为例,基于有限元方法分别建立主筒、主筒+加强桁架、主筒+加强桁架+附属桁架(铰接)、主筒+加强桁架+附属桁架(固接)四种钢结构冷却塔模型,并对比分析其动力特性及传力路径;然后基于计算流体动力学(CFD)技术进行直筒-锥段型冷却塔表面平均风荷载数值模拟,有分别加载规范和数值模拟风压对四种模型进行风致响应分析,对比研究增设加强桁架、附属桁架及与主筒和地面不同连接方式对直筒-锥段型钢结构冷却塔动力特性和静风响应的影响。主要研究结论可为我国此类超大型钢结构冷却塔的结构选型和抗风设计提供依据。
As a kind of new typical wind-sensitive structure, dynamic characteristics and wind-induced mechanical performance of a cylinder-conic section steel cooling tower are urgent to be studied. With a proposed super large steel cooling tower （189 m） in our country as an example, firstly, four steel cooling tower models induding a main cylinder, a main cylinder ＋ stiffening truss, a main cylinder ＋ stiffening truss ＋ accessory truss（ hinged） , and a main cylinder ＋ stiffening truss ＋ accessory truss （fixed） were established based on the finite element method. Their dynamic characteristics and force transmission paths were comparatively analyzed. Secondly, the numerical simulation of wind load on the surface of the cylinder-conic section steel cooling tower was conducted by using the computational fluid dynamics （CFD） method. Finally, with the specified and simulated wind pressure loads, respectively, wind-induced responses of four models were analyzed. The influences of adding stiffening truss and accessory truss and different ways of connection among accessory truss, the main cylinder and ground on dynamic characteristics and responses under static wind of the tower were comparatively studied. The studying conclusions provided a scientific basis for the structure form selection and wind-resistance design of this kind of super large steel cooling towers in our country.
出处
《振动与冲击》
EI
CSCD
北大核心
2017年第7期149-155,共7页
Journal of Vibration and Shock
基金
国家自然科学基金(51208254)
中央高校基本科研业务费专项资金资助(NS2016019)
中国博士后科学基金(2013M530255
1202006B)
江苏省优秀青年基金(BK20160083)
关键词
直筒-锥段型钢结构冷却塔
计算流体动力学数值模拟
动力特性
静风响应
参数分析
cylinder-conic section steel cooling tower
C F D numerical simulation
dynamic characteristics
responses under static wind
parametric analysis
