The structure analysis and selection of large rectangular aqueduct bridge with multi-longitudinal beams

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.