海口火车站风洞试验研究.pdf

西南交通大学硕士研究生学位论文第l页摘要随着现代土木工程技术的不断进步和发展,建筑结构形式呈现更高、更长、更柔的发展趋势,风荷载对于这些结构常常起着主要的作用。本论文所研究的海口火车站, 其地处海南岛,常遇台风、热带风暴等恶劣天气,受风力影响较大,同时由于该火车站的站房和站台雨棚结构跨度大、外形特殊、结构自重轻,在强风作用下的风荷载分布复杂,甚至会控制设计,且无法直接通过规范或借鉴已有资料获得其风荷载的有关参数,因此通过对其模型进行风洞试验,以确定其上风荷载的有关参数,对保证海口火车站的设计安全有重要意义。本文所做的主要工作:对海口火车站进行模型风洞试验,在模拟大气边界层及场址地形地物的条件下,测量站房屋盖及站台雨棚的平均风压分布、站台雨棚的脉动风压分布;根据风洞试验的结果计算站房及站台雨棚的体型系数、站台雨棚的位移风振系数;分析研究站台雨棚的表面风压分布特性和风振响应特性。本文的主要结论:海口火车站站台雨棚和站房顶棚的体型系数以负值为主且站台雨棚的体型系数要普遍小于站房顶棚,站房围护结构的体型系数较为复杂,需综合计算比较得到其最不利风向角:站台雨棚表面的风压以负压为主,主要承受向上的I吸力, 且站房对个别风向角下的站台雨棚风压系数影响较大;站台雨棚的位移风振系数随风向角变化较小,因此用位移风振系数代替荷载规范中的荷载风振系数束计算风荷载是合理可行的。关键词风洞试验;风压系数;体型系数;位移风振系数西南交通大学硕士研究生学位论文第1I页 Abstract With themodem civilengineering technology continues toprogress and development, the structures ofbuildings show ahigher,longer,more flexibletrend,SO wind load often plays amajor role forthese railway station of Haikou which thisthesis should study,iS located inHainan Islandwhich often meets severe weather such astyphoon and tropical storm,it’S influenced greatly by the wind force,additionally,because the structure ofthestation room andplatform canopy is withlargespan,specialappearance and lightself-weight,the wind loadunder theaction ofstrong wind plicatedly, even will controls design,and itsrelevantparameters of wind load unable tobe obtained from specification directly orbe drew on existing data,SOcarrying on wind-tunnel testof the itsmodel,in order toconfirm therelevantparameters ofwind load,has important meanings inguaranteeing thesafety ofdesign ofHaikou railway station. The main works ofthethesis:Carrying on thewind-tunnel testofHaikou railway stationmodel under theterms ofimitating atmospheric boundary layerand theterrainof the site,to measure theaverage wind pressure distribution ofthe stationroom andplatform canopy and thepulsating wind pressure distribution of theplatformcanopy;Then calculating theshape coefficients ofthestation room andplatform canopy and thewind vibrationcoefficients oftheplatform canopy on thebas