Date of Award

Summer 1992

Degree Type

Thesis - Restricted

Degree Name

Master of Science (MS)

Department

Civil and Environmental Engineering

First Advisor

Wenzel, Thomas H.

Second Advisor

Vinnakota, Sriramulu

Third Advisor

Heinrich, Stephen M.

Abstract

A beam-column joint was analysed using the specifications of ACI-ASCE Commitee 352. The adequacy of confinement, spacing of bars, the design strength of the joint in shear, flexural strength ratios and the moment strength of the longitudinal beams were studied. The load that caused the beam-column joint to fail was also computed. A finite element model and experimental full scale test models were constructed which duplicated the mathematical model of the beam-column joint. The mathematical model was similar but of a different size to the one analysed in Design Example 4 of the ACI-ASCE Committee 352 Report. The tests were conducted to study the effects of fiber reinforcement in concrete beam-column joints. A conventionally reinforced beam-column joint and a fiber reinforced beam-column joint were analysed using a finite element program called ANSYS. The finite element called STIF65 was selected to represent the behavior of reinforced concrete. The structural response was modeled by using the non-linear transient dynamic analysis. Symmetry boundary conditions were applied to reduce the number of finite elements used in the model and to limit the wavefront to the maximum permitted value of 500. The stresses in the reinforcement steel were studied. Force-displacement plots were drawn for the fiber reinforced beam-column joint and the conventionally reinforced beam-column joint. An experimental model of the two joints was constructed and tested. One of the joints was conventionally reinforced and the other contained 1% of steel fibers. The columns at the top and bottom of the joint and the two ends of the smaller beams were constrained. Cycles of loading were applied to the cantilever ends of the beams. Transducers measured the deflection at these points. Load cells measured the loads applied by the hydraulic jacks. The loads were incremented after every cycle until the beam-column joint failed. The performance of the two models are compared. Force-displacement plots are drawn for the fiber reinforced beam-column joint and the conventionally reinforced beam-column joint. The results of the experimental tests and mathematical modeling are compared. Conclusions and recommendations for future studies are made.

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