| With the implementation of the strategic development of western china, bridges in mountainous regions are increasing day by day. Bridge designers are more and more interested in prestressed concrete continuous rigid frame bridge with high piers and long spans. Because the disadvantages of cracks and large deflection existing in traditional continuous rigid frame bridge stand out, an improved bridge type---open-web continuous rigid frame bridge appeared recently, which empties part of box girder web near the pier. This dissertation will have a preliminary study in wind-resistance performance of the new bridge type.The dissertation relies on a domestic built bridge. With the combination of wind tunnel test and CFD numerical simulation, the dissertation analyzes the characteristic of open-web continuous rigid frame bridge under the wind load. The main contents of study are listed as follows:(1)By the use of wind tunnel test, the static coefficient of open-web continuous rigid frame bridge can be obtained. Meanwhile, we compare them with the existing experimental data of the solid-web continuous rigid frame bridge, and analyze the distinction and similarity. Then the analysis of ratio of width to height, ratio of width cantilever deck’s influence on the static coefficients are studied, establishing linear equations;(2)By the use of CFD numerical simulation, we analyze the reason why the static coefficients of open-web continuous rigid frame bridge is different from that of solid-web continuous rigid frame bridge. Then the dissertation studies the aero-dynamic influence of twin open-web boxes girder, and gets the relationship between permeability and the static coefficient.;(3)By the use of wind tunnel test, we analyze the difference of structural displacement response and acceleration response between open-web continuous rigid frame bridge and solid-web continuous rigid frame bridge under the construction stage of maximum double cantilever and different wind directions. |
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