Title page for ETD etd-4798-112921


Type of Document Master's Thesis
Author Alander, Chad C. M.S.
Author's Email Address calander@vt.edu
URN etd-4798-112921
Title Standoff Screws Used In Composite Joists
Degree Master of Science
Department Civil Engineering
Advisory Committee
Advisor Name Title
Easterling, William Samuel Committee Chair
Cousins, Thomas E. Committee Member
Murray, Thomas M. Committee Member
Keywords
  • shear connectors
  • composite joists
  • standoff screws
Date of Defense 1998-05-05
Availability unrestricted
Abstract

The purpose of this study is to evaluate the performance

of the 5/16 in. diameter Elco Grade 8 standoff screw as

a mechanical shear connector in composite joists.

Standoff screws are being investigated as an alternative

to welded shear studs in short span composite joists.

The data and results obtained from 106 pushout tests

performed on the Elco Grade 8 standoff screw are

presented. The test parameters include: standoff screw

height, quantity of standoff screws per deck rib, standoff

screw position, slab depth, base angle thickness, deck

type, and amount of transverse reinforcement.

The test results from this study are compared to those

obtained in previous research performed by Hankins

(1994), and the applicability of Hankins' predictive

equation for the shear strength of the Elco Grade 8

standoff screw is investigated. The influences of various

test parameters on the shear strength of the standoff

screw are evaluated and the effects of grouping the

standoff screws in the deck ribs are examined. The

performance of the standoff screw in solid slab

applications is also ivestigated. Predictive equations for

the shear strength of the Elco Grade 8 standoff screw,

based on screw-related failure modes, concrete rib

failures, and longitudinal splitting of solid concrete slabs,

are presented.

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