상용압연 형강과 콘크리트 합성거더의 다단계 긴장력 최적설계

Optimal Tension Forces of Multi-step Prestressed Composite Girders Using Commercial Rolled Beams

The 1st and 2nd tension forces of the PSSC(Prestressed Steel and Concrete) girder constructed with commercial rolling beams and concrete are optimally designed. The design variables are the 1st and 2nd tension forces due to multi-step prestressing and live load. The objective function is set to the maximum live load. Design conditions are allowable stress at the top and bottom of slab, beam and infilled concrete due to a construction step. An Optimization of Matlab based program Is developed. The results show that the tendon position and concrete compression strength etc are important.