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连续梁桥比多孔静定梁桥及多孔简支梁桥有较多的优点,但也有不足之处即支座处弯矩与跨中弯矩值相差悬殊;如两等跨连续梁支座处弯矩影响线面积为—0.125l~2而跨中处弯矩影响线面积为+0.0625l~2,又如三等跨连续梁支座处弯矩影响线面积为—0.117l~2而中跨跨中弯矩影响线面积为+0.075l~2。对于不等跨的连续梁桥而言这一差别更为突出。改为多孔静定梁桥虽能通过锚、挂孔长度进行一定程度的调整,但铰接处构造复杂且整体刚度受到影响。本文提出配置柔性支承垫层,使连续梁在活载作用下自动调整两处的弯矩使二者的绝对值接近。
Continuous girder bridges have more advantages than porous static girder bridges and porous simply supported girder bridges, but there are also some shortcomings: the moment of bearing is different from the moment of mid-span bending. For example, The influence line area of bending moment is -0.125l ~ 2 and the influence line area of bending moment in middle point is + 0.0625l ~ 2. For example, the influence line area of bending moment of third-span continuous beam bearing is -0.117l ~ 2 and medium Across the bending moment impact area is + 0.075l ~ 2. This difference is even more pronounced for continuous bridges of unequal span. Although the fixed quasi-static bridge can be adjusted to a certain extent by the length of the anchor and the hanging hole, the structure of the joint is complicated and the overall rigidity is affected. In this paper, the flexible support cushion is provided so that the bending moment of two continuous beams can be adjusted automatically under the action of live load so that the absolute values of the two are close.