Finite Element Predictions of the Behavior of Slab-Column Connections Transferring Moment


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Title: Finite Element Predictions of the Behavior of Slab-Column Connections Transferring Moment

Author(s): Jun Yamazaki and Neil M. Hawkins

Publication: Special Publication

Volume: 63


Appears on pages(s): 49-78

Keywords: building codes;connections; crete slabs; ilding codes; columns (supports); concrete slabs elastic analysis; finite element method; flat co -- lateral pressure; n- -ess

Date: 8/1/1980

Results are reported of the correlation between finite element predictions of the strength and behavior of flat slab to interior column connections transferring moment and response observed in tests on such connections. Predictions of the elastic response of the connections were made using a general elasticity program and a plate bending program. Although the general elasticity program considered shear deformations, it did not provide a markedly better correlation with the test data than the plate bending program. The plate bending analysis was extended into the inelastic range using an incremental procedure that recognized variations in stiffness and yielding of the slab with the directions of the reinforcement and principal moments. While the measured strains in the reinforcement and concrete were in reasonable agreement with the predictions, the measured deflections were about twice the predicted deflections. That discrepancy was found to be caused by bond slip of the reinforcement passing through the column and the inability of the program to correctly assess the torsional cracked section stiffness of reinforced concrete.