【摘要】 本文根据大型多纵梁矩形渡槽槽身结构及其受力特点,提出实用空间分析法,使复杂的空间结构计算分离成相互联系的两个平面问题。横向计算中,底部弹性支承在各纵梁上,可求得结构的横向受力与弹性支承反力;然后将弹性反力作为荷载,反向作用于纵梁上,进行纵梁的受力计算。通过结构形式的比较,指出具有大边梁的多纵梁矩形渡槽其侧墙兼做纵梁用,充分利用侧墙刚度大的特点,使横向挡水和纵向承重结合在一起,可以有效地减小水荷载对中纵梁的作用,从而增加渡槽的跨越能力,在大型渡槽的设计中应优先采用。更多还原

【Abstract】 The practical space analysis method is brought forward according to characters of acting forces and the large rectangular aqueduct bridge with multi-longitudinal beams.This method makes the complicated space structure calculation decompound into a couple of related plane problem.The bottom structure is supported by longitudinal beams in cross calculation,and then the cross forces and elastic supporting forces are obtained.The elastic supporting forces are regarded as loads and act reversely on longitudinal beams,then the forces acting on longitudinal beams are calculated.Through structure selection,the large rectangular aqueduct bridge with high side beams should be adopted firstly.Because the side beams may reduce the middle beam loads,the span of aqueduct bridge can be increased.更多还原