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In the past two decades , with the rapid development of large-span bridges , orthotropic plate flat steel box girder because of its light weight, vertical and horizontal spans capacity, production and installation period is short , the main beam without creep, structural dynamic performance etc., as a large section of the bridge span is commonly used . Wind Stability in order to meet the requirements of modern large-span cable-stayed bridge , suspension bridge also uses split steel box , this form of the beam is made ??of steel box girder bridges form the axis of the upper and lower ventilation . Orthotropic plate steel box with both orthotropic plate characteristics, but also has a box -shaped beam characteristics , has been widely used, but it is still an incomplete maturity structure, in the design, manufacture , installation , etc. obtained in a series of problems , people know it has not yet reached a unified and mature. The thesis research at home and abroad and foreign scholars on the basis of design specifications to Jiashao steel box girder bridge engineering background of the local model of the steel box girder made ??the following several aspects: 1 , outlines the orthogonal flat steel plate girder heterosexual development , application status and the presence of the key technical issues . 2, in the beam segment Erection of the process, is lifting crane beam segment and the role of the deformation of the two beam segments are opposite , the two beam segments spliced ??section will have a certain degree of deformation is poor, resulting in beam segment stitching Compare difficulties , the paper these two beam segments in the lateral deformation of the cantilever when assembled to do the relevant calculations . 3 , including the original design, including selecting a different thickness and U U rib rib height of two roof U rib arrangement , calculation of vehicle loads in the stress and deformation . 4 , including the original design, including selecting a different arrangement of diaphragms spacing case , calculation and analysis of its eccentric loads bending stresses and warping normal stress distribution . Through the above calculation and analysis, got steel girder roof , U rib in the construction and vehicle loads of stress and deformation distribution in the hope of future large-span bridges orthotropic plate flat steel box girder design and construction can provide a reference .
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