| Spatial steel frame is a kind of fasting type lightweight steel structure，composed oflongitudinal chords through horizontal and inclined lace bar after welding.Combined withspatial steel frame reinforced concrete structure steel skeleton parts, forming a compositestructure in the form of buried spatial frame steel reinforced concrete structure. Spatialsteel frame can bear the load of the construction stage before concrete hardening, simplifytheformwork support system and bear the load with concrete after concrete hardening,compressing the core area of concrete,This kind of structure is suitable for the large spanand large storey structure,sothe systematic research on it has certain significance.Currently, research on a few buried spatial steel frame reinforced concrete structureand mechanism of the force main aspects of bearing capacity, research methods andformulas for calculating the stiffness and crack width of buried spatial steel framereinforced concrete beams are even less.Therefore, research in stiffness and crack widthcalculation methods and formulas using phase buried spatial steel frame reinforcedconcrete beams is necessary.5buried spatial steel frame reinforced concrete beams and1reinforced concrete beamare experimented in this article,and the key of research is deformation and strength ofburied spatial steel frame reinforced concrete beam，as well as that calculation method andformulas of crack width and short term stiffness is mainly studied.The test results showthat the strength and stiffness of buried spatial steel frame reinforced concrete beam areboth improved which compares with ordinary reinforced concrete and increased with thereinforcement ratio increases. And it is obvious.Then calculation method and the formulaforcrack width and short term stiffness of buried spatial steel frame reinforced concretebeams are proposed.In this paper, the calculation formula and is in good agreement withexperimental result. |
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