Study on Damage Mechanism and Design Method of R.C. Abnormal Frame Joints in Thermal-Power Plant

Abstract eng:
The R.C. large-scale thermal power plants commonly contain abnormal joints. Based on the pseudo-static results of four 1/5-scale specimens and failure characteristic in the pseudo-dynamic structural test, the damage mechanism and the failure of abnormal joints under the shear force are analyzed. Two typical failure modes are presented: small core shear failure and the column shear failure. The factors affecting the shear failure mode of abnormal joints such as: axial compressive ratio, the stiffness ratio of big beam with small beam, stirrup ratio of small core and column etc. are present. According to experimental result, joints the diagonal loads very near to the yielding load and abnormal joints seismic behavior was poorer than normal joints, the formula for calculation of the shear-bearing capacity of abnormal joints are given. It is helpful for design the abnormal joints in the thermal power plants.

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