1 Influence of Fracture and Delayed Effects on Steel-Concrete Composite Structures 5 Crack opening (mm) 0 0,1 0,2 0,3 0,4 0,5 0,6 100 1000 10000 100000 Time (days) Creep Shrinkage Fig. 1.3 Crack opening due to creep/relaxation effects with first reinforcements Crack opening (mm) 0 0,01 0,02 0,03 0,04 0,05 0,06 0,07 0,08 0,09 100 1000 10000 100000 Creep Shrinkage Time (days) Fig. 1.4 Crack opening due to creep/relaxation with second reinforcements 1.4 Conclusion In this chapter, the behavior of preflex beam is investigated. The different materials used in the design of this structure are presented. The design step and the numerical implementation of crack opening with LUSAS software are detailed. The crack processes due to creep and shrinkage effects are investigated. It is observed that the use of reinforcement decreases significantly the crack opening even if the creep is responsible for more than 77% of the crack opening process. From these
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