CAJ | 학술논문

通过刚性模型测压风洞试验获得某核电站220 m高特大型冷却塔的内表面风荷载，分析冷却塔内表面风荷载的三维效应，采用有限元计算方法对内压设计取值简化进行探讨，并对结果产生的原因进行分析.结果表明，冷却塔内表面风压并非完全沿环向、高度均匀分布，这种不均匀性以风筒施工期间的空塔尤为严重；尽管内压的大小及分布特征会对响应产生一定的影响，但由于冷却塔的风致响应中以外压占主导地位，内压对响应的贡献较小，将具有“三维效应”的内压简化为沿高度、环向不变的常数进行设计可满足安全性要求，大小可取为-0.50.研究结果可为200 m级特大型冷却塔设计内压取值和相关规范修订提供参考与依据.
통과강성모형측압풍동시험획득모핵전참220 m고특대형냉각탑적내표면풍하재，분석냉각탑내표면풍하재적삼유효응，채용유한원계산방법대내압설계취치간화진행탐토，병대결과산생적원인진행분석.결과표명，냉각탑내표면풍압병비완전연배향、고도균균분포，저충불균균성이풍통시공기간적공탑우위엄중；진관내압적대소급분포특정회대향응산생일정적영향，단유우냉각탑적풍치향응중이외압점주도지위，내압대향응적공헌교소，장구유“삼유효응”적내압간화위연고도、배향불변적상수진행설계가만족안전성요구，대소가취위-0.50.연구결과가위200 m급특대형냉각탑설계내압취치화상관규범수정제공삼고여의거.
Wind tunnel tests were carried out to measure the wind pressure on the internal surface of a 220 m-high super large cooling tower,and then analysis on the three-dimensional effect of internal pressure was conducted,and finally,simplified methods for obtaining the design value were investigated.The anal-ysis results indicate that the wind loads on the internal surface of the cooling tower behave with remarkable three-dimensional effect,and they are not strictly uniformly distributed along both the hoop and the merid-ional direction.This nonuniformity is particularly serious when the tower is in the construction period. The size and the distribution of the internal pressure have some influence on the wind-induced response, but because the outer pressure plays a dominant role in the wind-induced response of cooling tower,the contribution of the internal pressure to the response is small.So the design value of internal pressure can be simplified as constant -0.50,which is proved to be very safe for the structure.The results can provide reference for both the design of 200 m high super-large cooling tower and our specification revision.