| Because of its series of advantages such as high strength, stiffness, ductility,excellent seismic capability, fire and corrosion resistance, steel reinforced concrete areused more and more for practical engineering. The research on component torsional isquite lack and focused on joist steel reinforced concrete beams in China. The researchon channel steel reinforced concrete beam（CSRCB）is almost empty. It is verynecessary to study on torsional behavior of the channel steel reinforced concrete beam.The element models for CSRCB subjected to pure torsion are established fornonlinear finite analysis by software-ANSYS, the stress distribution of the concrete, barand steel as well as the development and form of cracks are analyzed in the loadingstage, compared with the results of the experiments at the same time. The results ofnumerical method agree well with those of the experiments. Besides, the effect ofconcrete grade, stirrups form, lacing bar form space and angular on the ultimatecapacity of, channel steel reinforced concrete beam were discussed in this paper. Giventhe results of simulation, it can be concluded that the crack capacity of the specimensimproves with the increase of the concrete strength; the ultimate capacity of thespecimens improves with the increase of the concrete strength; decreases with theincrease of the stirrup spacing; is negatively correlated with the growth of the lace barspacing; as for the comparisons of specimens with different elements such as spiralstirrups versus common stirrups, angle steel lace bars versus flat steel lace bars, verticallace bars versus45degree lace bars, the specimens with the former elements can bearmore load.Combining with the results of finite element analysis, the calculation formulas of crack torsion strength and ultimate torsion strength for CSRCB are proposed. Resultscalculated using the proposed formulas agree well with experimental results. The thesisconclusion would be helpful for further investigation of the SRC members. |
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