摘要
基于计算流体力学方法(CFD)对某在建亚洲最高(189 m)超大直筒-锥段型钢结构冷却塔进行数值风洞模拟,提出直筒和锥段典型断面处表面绕流和尾迹特性,同时分析直筒和锥段内表面平均风荷载分布特性,并给出相应的体型系数拟合公式。基于有限元方法对超大直筒-锥段型钢结构冷却塔分别进行3种工况(内压作用、外压作用、内外压共同作用)下的静风响应分析,研究内压效应对超大型直筒-锥段钢结构冷却塔的主筒、加强桁架和附属桁架三部分结构风致响应的影响规律。研究结果表明:锥段内表面体型系数在迎风面与直筒段数值相近,其他部位偏离较大;内压效应对结构负向位移、主筒负压极值区的横杆轴力、附属桁架横杆轴力及上部加强桁架支撑轴力影响相对较大。
Using the computational fluid dynamics(CFD)method the numerical wind tunnel was conducted to simulate a 189 m-high cylindrical-conical steel cooling tower,Asia’s highest cooling tower that is still under construction.The features of the airflow around the typical cross-sections and its wake were extracted,and the distribution of mean wind loads along the internal surfaces of the cylindrical and conical sections was obtained.The functions for estimating the internal surfaces shape factors of the cylindrical and conical segments were obtained by fitting to the simulated data.Furthermore,finite element method was used to analyze the static wind-induced response of the cylindrical-conical steel cooling tower under internal pressure,external pressure,or both internal and external pressure.The effect patterns of internal pressures on the wind-induced responses of the main tube,stiffening trusses and auxiliary trusses of the tower were derived from the analysis results.The results show that the inner shape coefficient on the windward surface of the cone section is close to that of the straight section of similar value,but in other parts the deviation is great.The internal pressure effect has greater influence on the negative displacement of the structure,the axial force of the horizontal bar in the negative external pressure area of the main cylinder,the axial force of the auxiliary truss,and the axial force of the upper reinforcement truss.
作者
杜凌云
柯世堂
DU Lingyun;KE Shitang(College of civil engineering,Nanjing University of aeronautics and astronautics,Nanjing 210016,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2018年第3期684-695,共12页
Journal of Central South University:Science and Technology
基金
江苏省优秀青年基金资助项目(BK20160083)
国家自然科学基金资助项目(51208254)
中国博士后科学基金资助项目(2013M530255
1202006B)~~
关键词
钢结构冷却塔
直筒-锥段型
数值风洞
平均风荷载
风致响应
内压效应
steel cooling tower
cylinder-conic section
numerical wind tunnel
average wind pressure
wind-induced response
effect of internal pressure
