| Influence of concrete differential aging time on the construction phases analysis of the Fenghua River Bridge |
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| 作者姓名： | 余报楚 |
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| 作者单位： | Institute of |
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| 摘 要： | IntroductionTheFenghuaRiverBridgeisamajorprojectonthehighwaybetweenHengzhangandGuojiachi.ItstretchesacrosstheFenghuaRiverwithatotallengthof750m.Intheworkingdrawings1],themiddlemainsupportingbasementisnamedK2+416inthewholeproject.Thetotalspanofthebridgeis(11×20+55+2×100+55+11×20)mwhilethemainfourspansaresequentially(55,two100,and55)m,whichareconstructedbysymmetricalcantilevercastingwithdifferentbeamsections.Totheendingsection,asinglebeamsingleroomstructureisapplied.Thefivesteel-concrete…
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| 关 键 词： | 奉化江大桥 预应混凝土连接箱形梁 悬臂结构 施工管理 混凝土微分老化期 |
Influence of concrete differential aging time on the construction phases analysis of the Fenghua River Bridge |
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| YU Bao-chu,ZHANG Zhe,TENG Qi-jie.Influence of concrete differential aging time on the construction phases analysis of the Fenghua River Bridge[J].Journal of Chongqing University,2004,3(2):34-37. |
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| Authors: | YU Bao-chu ZHANG Zhe TENG Qi-jie |
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| Abstract: | The Fenghua River Bridge is a major structure on the highway between Hengzhang and Guojiachi, which is to be built with a four-span prestress concrete (PC) box girder and symmetrical cantilever castings. In this paper, a finite element method (FEM) model is set up to study the effects of concrete differential aging time on the construction phases of the Fenghua River Bridge by calculating the vertical displacement of the folding segment of the middle span and the longitudinal bending moment of Pier 12#. In the model, the girders are classified into 150 changing sections based on the desgn scheme, and their construction is to be carried in 16 phases respectively to build 12 blocks connected by a side folding segment and a middle folding segment,covered with a second dead load and in completion for 20 years. It is found that the internal forces and deformations of the concrete structures at the aging time of 60 d are quite different from those of 0 d aging time while the behaviors of the structures of 120 d aging time is nearly the same as those of 60 d aging time- the differences are so small that can be neglected,suggesting that the creep develops obviously about one month after the cement is hardened and the development fades later on. |
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| Keywords: | the Fenghua River Bridge prepress concrete successional box girder cantilever construction construction control concrete differential aging time the Fenghua River Bridge analysis construction aging time differential concrete structures creep cement development internal forces deformations quite nearly the differences small dead load completion build blocks |
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