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连续梁桥受力整体性好、刚度大、荷载作用下竖向变位小、行车平顺、安全舒适,而且结构轻巧,造形美观,因而具有强大的生命力和广阔的应用前景。连续梁为超静定结构,墩台沉降或支座强迫位移时,由于受到超静定赘余约束的制约,必然产生附加内力。在设计中,无法知道哪个支座或哪几个支座发生位移,因而也就无法直接确定最大支点负弯矩和最大跨中正弯矩。本文从连续梁的三弯矩方程入手,建立支座位移相应三弯矩方程,依据单个支座位移的弯矩图,利用叠加原理(因支座间弯矩按直线变化),分析可能发生的最不利支座位移,从而确定可能发生的最大支点负
The continuous girder bridge has the advantages of good overall integrity, high rigidity, small vertical displacement under load, smooth running, safe and comfortable structure, lightweight structure and beautiful appearance, thus having strong vitality and broad application prospect. When the continuous beam is statically indeterminate, settlement of abutment or abutment forced displacement, due to constraints of superf statistic superfluous constraints, additional internal forces will inevitably occur. In the design, it is impossible to know which bearing or which bearings are displaced, and thus it is impossible to directly determine the maximum fulcrum negative moment and the maximum cross-center positive moment. Starting from the three-moment equations of continuous beam, the corresponding three-moment equations of bearing displacement are established. According to the bending moment diagram of single bearing displacement and the principle of superposition (the bending moment between supports changes linearly) The most unfavorable bearing displacement, so as to determine the maximum possible negative pivot point