A NEW MODEL FOR JOINT SHEAR FAILURE OF REINFORCED CONCRETE INTERIOR BEAM-TO-COLUMN JO

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A NEW MODEL FOR JOINT SHEAR FAILURE OF REINFORCED CONCRETE INTERIOR BEAM-TO-COLUMN JOINT

Author: Hitoshi SHIOHARA | Size: 725 KB | Format: PDF | Quality: Unspecified | Publisher: Journal of the School of Engineering, The University of Tokyo, Vol. XLV (1998) | Year: 1998 | pages: 30

The primary objective of this study is to point out an irrationality in the joint shear failure model, which is adopted in the most current design codes of reinforced concrete beam-to-column joint. To examine this issue, tests of twenty reinforced concrete interior beam-to-columnjoint failed in joint shear are reexamined. The data indicated that joint shear stress had increased in the most specimens, even after apparent joint shear failure starts, while beam moment decreases due to decrease of flexural resistance which is caused by reduction of distance between stress resultants in beam at column face. The cause of the deterioration of story shear is identified to be a degrading of moment resistance of joint, originated from a finite upper limit of anchorage capacity of beam reinforcements through the joint core. So a new mathematical model for joint shear failure is introduced to reflect this fact. The behavior of the
model is investigated and a new approach for the design of beam-to-column joint in seismic zone is proposed based on the prediction of the model.

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