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一、概述宜城汉江公路大桥全长约1887米,主桥设计为6跨即:55+4×100+55术的连续梁桥,桥型布置见图1。在主桥设计中,采用了国内首次采用的双支座的支承体系,双支座的支点部分从结构整体来看为一支点群,从主墩局部(纵向)来看为两个独立的支点,结构受力时,双支座的支承作用与固端近似,在这种类似固端的嵌固作用下,与单支点的连续梁相比,荷载作用时的支点负弯矩和跨中正弯矩均较大幅度降低,且某跨作用的荷载,其效应对
I. Overview The Yichang Hanjiang Highway Bridge is about 1887 meters in length. The main bridge is designed as a continuous bridge with 6 spans, namely 55 + 4 × 100 + 55. The layout of the bridge is shown in Figure 1. In the design of the main bridge, the first dual support system adopted in China is adopted. The fulcrum part of the double support is a point group as a whole, and from the partial (longitudinal) view of the main pier, there are two independent fulcrums . When the structure is subjected to force, the supporting effect of the two supports is similar to that of the solid ends. Compared with the continuous beams with single fulcrums, under the effect of such fixed solid ends, the negative moment and the mid-span positive moment Are greatly reduced, and a cross-acting load, the effect of