In order to rationally design simply supported precast channel steel concrete composite beam for urban viaduct, structural design factors such as mid-span cross-beam layout, cross-section layout （number of main beams）, beam height, and bridge deck width were selected, and various parameters were set. The calculation and analysis of the determined composite girder bridge deck and steel girder slabs have resulted in the following conclusions： ① Under the premise of meeting the structural stress requirements, the installation of the mid-span beams will slightly increase the cost and affect the construction speed and landscape performance. Only the end beams can be installed; ② Generally, the arrangement of large openings and fewer beams is more cost-effective than the arrangement of small openings and multiple beams; ③ The economic beam height of the 30 m span composite beam is 1.6~1.8 m, the 35 m span economic beam height is 1.8~2.2 m, and the 40m span economic beam height is 2.0~2.4 m。
Key words
Urban viaduct /
steel-concrete composite beam /
economic analysis /
engineering design /
parameter analysis
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