Effect of Steel Fibers on Precast Dapped-end Beam Connections

Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)


Civil Engineering

First Advisor

Nadim Hausson


The analysis of connections in precast concrete structures is complex due to the concentration of stresses on the bearing areas that transfer loads from one member to another. The design equations available were developed through field experience, tests and structural analysis. Proper design should take into consideration the safety, simplicity, and economical and practical applications of these connections, as well as the production of structural units and construction situations pertinent to precast concrete buildings. Proper reinforcement must be provided to ensure the safety of the connection. One possible improvement is the addition of steel fibers to the concrete mix. The presence of steel fibers is expected to reduce cracking and increase the shear load capacity of the connection. In this research, different ratios of steel fibers to concrete will be used. Also, different patterns of shear reinforcement will be adopted. The depth ratio of the recessed ends to the total depth of the main beams will also be varied to investigate the contribution of steel fibers in shallower end depths. A total of 18 dapped-end beams will be prepared and tested up to failure. In general, the main objective of this research program is to study the dapped-end connection with respect to the following: 1) to simplify the reinforcement details of the connection as shown in Figure 1.3. 2) To determine the different modes of failure. 3) To investigate the contribution of steel fibers to the strength capacity of the connection. 4) To investigate the possibility of replacing part of the reinforcement with steel fibers. 5) To study the effect of the variation in the ratio of the dapped-end depth to the total depth on the strength capacity of the connection. 6) To develop new expressions to evaluate the strength of the connection when steel fibers are used. 7) To determine such physical properties of fibrous concrete as the compressive strength, the modulus of elasticity, flexural strength, and split tensile strength.

Library of Congress Subject Headings

Concrete beams -- Fatigue
Reinforced concrete, Fiber
Reinforced concrete -- Cracking



Number of Pages



South Dakota State University


No Copyright - United State

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