Tiny cracks could be found out on the surface ofprestressed concrete girders with careful observation.Some cracks are in certain directions, but most of themare orderless. In the initial stage, these small cracks aren...Tiny cracks could be found out on the surface ofprestressed concrete girders with careful observation.Some cracks are in certain directions, but most of themare orderless. In the initial stage, these small cracks arenot harmful to the girders, but as time went by, thesecracks may gradually grow serious because of exoticburthen and temperature changes. Cracks may resultin the erosion of steel bars, the debase of anti-splitcapacity of girders, the fall of the effective height ofsections, thus cause the reduction of anti-bending andanti-twist capacity of the girder structure. If only we findout the reasons for cracks and put forward effectivemeasures to deal with it, cracks could be avoided.展开更多
Taizhou Yangtze River Highway Bridge is the first three-pylon two-span suspension bridge in China. The main girder adopts flat steamline steel closed box girder which has well wind-resistant capability and is technica...Taizhou Yangtze River Highway Bridge is the first three-pylon two-span suspension bridge in China. The main girder adopts flat steamline steel closed box girder which has well wind-resistant capability and is technically mature besides beautiful appearance. Straight web plates of the steel box girder in longitudinal direction are proposed in order to ensure the integrity of the steel box girder, and to keep the stress of the steel box girder continuous in the middle pylon, as well as to reduce the gradient of the middle pylon columns. The cross section of the box girder has one box with three cells. Solid-web diaphragm plate with good integrity and high torsional stiffness is adopted. The lifting lugs are utilized in the anchors of suspender cable. In this paper, selection of the cross section of the steel box girder, the general structure design, local structure design and main structure calculation results of Taizhou Yangtze River Bridge are introduced emphatically.展开更多
文摘Tiny cracks could be found out on the surface ofprestressed concrete girders with careful observation.Some cracks are in certain directions, but most of themare orderless. In the initial stage, these small cracks arenot harmful to the girders, but as time went by, thesecracks may gradually grow serious because of exoticburthen and temperature changes. Cracks may resultin the erosion of steel bars, the debase of anti-splitcapacity of girders, the fall of the effective height ofsections, thus cause the reduction of anti-bending andanti-twist capacity of the girder structure. If only we findout the reasons for cracks and put forward effectivemeasures to deal with it, cracks could be avoided.
基金National Science and Technology Support Program of China ( No. 2009BAG15B01) Key Programs for Science and Technology Development of Chinese Transportation Industry( No. 2008-353-332-170)
文摘Taizhou Yangtze River Highway Bridge is the first three-pylon two-span suspension bridge in China. The main girder adopts flat steamline steel closed box girder which has well wind-resistant capability and is technically mature besides beautiful appearance. Straight web plates of the steel box girder in longitudinal direction are proposed in order to ensure the integrity of the steel box girder, and to keep the stress of the steel box girder continuous in the middle pylon, as well as to reduce the gradient of the middle pylon columns. The cross section of the box girder has one box with three cells. Solid-web diaphragm plate with good integrity and high torsional stiffness is adopted. The lifting lugs are utilized in the anchors of suspender cable. In this paper, selection of the cross section of the steel box girder, the general structure design, local structure design and main structure calculation results of Taizhou Yangtze River Bridge are introduced emphatically.
