Reinforced Concrete Inverted T-beam Structural Performance

Widening-bay room house can provide with better and reasonable architecture performance, and offer to the residents of the house the choice of secondary design. Adopting Steel reinforced concrete continuous beam is one of the efficient measures to realize widening-bay of structures girder. In this thesis the negative moment segment of the continuous T beam was replaced by invert simple support beam in order to study the configure of its tensioned bars and the flange effective width. Through the academic analysis it is concluded that the key of tensioned bars distributing in the flange is portrait resisting shear carrying capacity at the conterminous section of flange and web. The conterminous section of flange and web in the shear span segment of T beam is the most feeble section about portrait transmitted force, and its portrait shear was bored by the shear section concrete and transverse together. Before the portrait crazing, the portrait shear stress was mainly bored by the concrete. The increase of transverse rate has a little effect to increasing the portrait carrying capacity, therefore the transverse can be designed according to the conformation. Therefore, in order to ensure SRC T beam does not appear portrait crazing in the course of natural use, the area of tensioned bars in the flange must be controlled. According to the data analysis of experimentation, it is educed that the concrete resisting shear coefficient, that is, the ratio of the concrete shear stress and the resisting shear intensity before the portrait crazing, and it is adopted as 0.35 and it lays particular stress on safety. To ensure the portrait crack not appear before resisting bend design moment of the beam, the formulae satisfied of the area of tensioned bars in the flange was given in this thesis. In this thesis, the flange effective width of some of tensioned bars in the flange was put forward when the flange of SRC continuous T beam was tensioned. It must satisfy the regulation on T beam tensioned flange in"Concrete Structure Design Criterion GBJ10-89"and the prepositional width in this thesis.