Shear Behavior Of Reinforced Concrete Corbels

Precast concrete structures have the advantages of high production efficiency,good component quality,and less field operations,and therefore are widely used.For the precast reinforced concrete(RC)frame structure,it can be assembled by corbels supporting the precast RC beams.That is,the beam and the column with the corbel are prefabricated in the factory,and then the precast beam and the precast column are connected through the corbel at the construction site.The RC corbel carries the load from the precast beam and transfers it to the column.Therefore,it plays a key role in load transfer.Plane section assumption cannot be used for RC corbels,which belong to the typical D region.If it is not designed properly,shear damage can easily occur,resulting in damage to the building or even collapse.However,there are many deficiencies in the existing standard formulas and analytical models.In view of this,this paper conducts a systematic and in-depth study on the shear performance of RC corbels.The main research contents and results are as follows:(1)A specimen database of RC corbels with shear failure is established.Based on the shear database,the main influence factors on shear capacity of the RC corbels are analyzed.(2)Based on the shear database,the existing standard formulas and analytical models are analyzed and compared.On this basis,a Soften Strut-and-Tie Model(SSTM)for shear capacity is proposed,which can predict more accurate results than current methods,and thus can be used as a reference for design.(3)A non-linear-finite element analysis(FEA)model calibrated with experimental data is established,which can be adopted for the whole process analysis of RC corbels.