体外预应力装配式桥墩方案设计及有限元分析-结构工程专业论文.docx

武 汉 理 工 大 学 硕 士 学 位 论 文(3 ) In the u se P h ase o f the b rid g e ，the m ax im umten sile stress o f the eo n erete att he e n d o f ste e l st ra n d 15 6 . 3 4 M P a ，w h ic h 15 m o re t h a n t he d esig n v a lu e o f c o n e re testrength .Th erefore，the stre n gth enin g treatm ent sh ou ld b e ea币 ed ou t in the d esign o fP ie rs，f or e x a m P le ，t he ste e l P la te w it h t he siz e ，5 2 1 0 1llm X Z 1 0 m m X 3 0 m m a n d 4 la y e rsP iralrei n foreem eni are set in the an ch or en d an d jaekin g en d .(4 )Inthelon gitud in aleffe eto ftheearth quak e， wh enu sin gten silestre ss口con = 0·65场 and 口con = 0 re印ectiVel又the form er top pier displacem ent alongth e b r id g e 15 1 5 .2 5 % t he la tte r o n e . T h e f or m e r P ie r e ar th q u a k e f un e tio n 15 1 . 3 8 tim e s t he la tt e r P ie r. In t he tra n sv e rse e f fe c t o f t he e a r th q u a k e ， t he f or m e r to P P ie r d isP la c e m e n t a lo n g t h e b r id g e 15 3 . 2 6 % o f t h e la t te r ’s : a n d t he f o r m e r，5 e a r ih q u a k e允 n c tio n 15 th e 0 . 9 7 tim e s la tt e r ’5 . In e o n e lu sio n th e P re st re ss st ru c tu re 15 m o r e sr o n g e rt ha n n o t P re str esse d o n e .(5) In the lon gitudin al effe et of the earth qu ak e，the m ax irnurn ten sile stress o ecur s at the en d o f P iers，its v alu e is O .52 M P a an d less th an the d esign stre n gth.W h en th ePreeast b rid g e P iers are u sed in h igh seism ie fortificatio n inten sity regio n ，the sh eari n gf ore e in t he b o t to m o f P ie rs 15 b e y o n d th e sh e a r e a p a e ity ，th e re f or e ，t he P re c a st b r id g eP iers are n o t su itab le for th is regio n .K e y w o r d : e x te m a l P re st re ssin g ; P re f ab r ie a te d b r id g e P iers ; f in ite e le m e n t a n a ly sis ; se ism ic P e r fo r m a n e e ; re sP o n se sP e e tru rn a n a ly sis111口尸武 汉 理 工 大 学 硕 士 学 位 论