CALCULATION METHOD AND COUNTERMEASURE FOR CLOSURE TEMPERATURE INFLUENCE IN TRUSSED CFST ARCH BRIDGE

For trussed CFST arch bridge, closure temperature influence to internal force and line form of arch on empty steel tube arch state is analyzed, the method of eliminating temperature influence is discussed, and the least square method to calculate jacking force as well as counterweight is proposed. By taking MaoCaoJie bridge as a interested case, the effectiveness of the proposed method is verified. At last, after contrastively analyzing various measure of adjustment, the following conclusions are drawn: for MaoCaoJie bridge, if the closure temperature is higher than the design datum temperature, jacking lower chord with counterweight is the best measure; if the closure temperature is lower than the design datum temperature, jacking lower chord with pulling upper chord is the best measure.