| Typhoon is a ser ious natura l d isast er which affect s so ut heast co ast a l areas o f China, so it is impo rtant to ca lcu lat e fluct uating w ind lo ad o f st ructures in t he t yphoo n a ffect ed area, and t ho se struct ures usually inc lude t a ll bu ild ing s, large-span spat ia l str uctures, et c. Co here nt funct io n o f fluct uat ing w ind characterist ic s is an impo rtant int er med iat e paramet er in wind lo ad calcu lat io n, and t he co herent st ruct ure o f fluct uat ing w ind is t he ke y factor to accurate ly est imat e t he wind lo ad and w ind- induced response. This d issert at io n w ill est ablish coherent fu nct io n ba sed o n fie ld measured dat a in near ground t yp hoo n fie ld, syst e mat ic analysis the charact erist ics o f co here nt st ructure and it s impact o n corre lat io n co effic ient, tur bu le nce int ermit t enc y, Gaussian p rop erty, peak facto r and gust facto r simu lt aneo usly.The exist ed near gro und mu lt i-po int simu lt aneo us w ind o bservat io n s yst e m has bee n impro ved, whic h co mpr ises 8 mo va ble w ind o bserving t o wers, and t he ma in pur po se o f t his improvement is to ena ble t he m to wo rk st eadily and co nt inuo usly for a lo ng time in t yp hoo n envir o nme nt. Typ hoo n and norma l w ind has been measured wit h t his observat io n syst em, fluct uat ing w ind c haracterist ic s o f t yp hoo n and nor ma l wind ha ve be en co mpa rat ive ly a na lyzed.Theo ret ica l mo de l a nd e mp ir ica l mo de l o f co herent fu nct io n o f t urbu le nc e has been est ablished, and para met er sensit ivit y a na lysis has bee n carr ied out in t he der ivat io n o f t he t heoret ica l mo de l, t he est ablishme nt o f e mp ir ica l mo de l was based o n t yphoo n and nor ma l w ind fie ld mea sureme nt dat a, whet her t heo ret ica l mo de l o r e mp ir ica l mo de l mo de ling wer e fu lly t aken into acco unt t he effect o f t he under lying surfac e ro ughness le ngt h, at mospher ic st abilit y, yaw a ng le and other facto rs. Fina lly, t he co rr ect ness o f bot h mode l ha s bee n ver ified by t he measured dat a, and t he hor izo nt a l co rre lat io n co efficient o f frequency-depe ndent has bee n pro po sed, at t he sa me t ime, t his co rr e lat io n co e fficie nt and t he corre lat io n co effic ie nt g ive n in o ur co unt r y lo ad code ha ve bee n co mpared toget her.The co herent st ruct ure o f t urbu le nt was extract ed and t he feat ures o f co herent struct ure wer e ana lyzed based o n fie ld mea sure me nt dat a o f t yphoo n Ka lma eg i and no r ma l w ind, t he influe nce me nt o f co her ent st ruct u re t o so me turbu lence charact er ist ics was analyz ed at t he same t ime. In or der to ext ract mult i-sca le co herent st ructure and ana lysis it s effect to turbu le nt character ist ics, we intro duced a d iscret e wavelet transfor m. Spavelet ana lysis met ho d was pro po sed whe n ana lyz ing t he charact er ist ics o f co herent str uct ure, t his met ho d co mbines a high-r eso lut io n in large-sca le o f cont inuo us wave let and hig her freque nc y reso lut io n o f AR mo de l(Auto Regressive Mo de l) spect rum est imat io n, draw ing co nc lusio ns t hat co herent str uct ure have int er mitt enc y and short per io d. Fina lly, ana lyz ing t he impact o f co her e nt struct ure o n cor re lat io n co e fficient, turbu lence int er mitt enc y, Gaussian prop erty, gust facto r and peak facto r, co nc lud ing t hat co herent struct ure is t he root cause of t urbu lence int er mitt enc y; co herent str ucture ind irect ly influe nce t urbu le nce int er mitt enc y t hro ug h turbu lence Gauss ian propert y; corr e lat io n co effic ient, peak factor and gust facto r are decreased aft er extract ing cohere nt struct ure fro m t urbu le nt. |
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