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In order to investigate the mechanical behavior of C40 SRC beams at early-age, seven steel reinforced concrete beams which contain H-steel were tested by monotonic static test on 1, 3,7 and 28 days of curing. Load-displacement curves, load-strain curves and influence of beams early loading on its later behavior were analyzed through the tests. The test results show; for the C40 SRC beams the 1-day strength can reach 75. 5% of the 28-day strength by adding early strength agent, the early loading to the beams has little effect on their later 28-day strength. Based on the test results, the nonlinear finite element analysis software ABAQUS was used to simulate the behavior of the specimens. The experimental results have good agreement with those simulated by ABAQUS. [ABSTRACT FROM AUTHOR]

Considering the composition features of outside frame, rib grid and infilling brick of multi-ribbed composite slab structures(MRSS), a nonlinear numerical analysis model was developed based on general finite element software with the application of multi-layer shell theory, fiber model theory and user-defined material model. This model reflects both the structural integrity characteristics and local mechanical behavior such as local cracking or extruding of MRSS. The comparison between the numerical simulation results and the experimental data of three component specimens and one structural specimen, shows that this model can be used in the nonlinear calculation or analysis of large MRSS under complicated conditions and has a high accuracy of prediction. [ABSTRACT FROM AUTHOR]