Insight into mechanics of externally indeterminate hardwood–concrete composite beams

WHO IS THIS RESEARCH RELEVANT TO AND WHY

Structural engineers and specifiers interested in hardwood–concrete composite beams

ABSTRACT / DESCRIPTION

This paper presents tests on beech LVL–concrete slab composite connections and externally indeterminate beams using connectors comprising fully threaded (FT), small-headed screws or partially threaded (PT), large-headed screws in X-formation. A test was devised to quantify connection characteristics in fully cracked concrete (applicable to hog zones of the beams). Relative to the FT-based connections, the PT-based connections were of greater strength, nonlinearity and flexibility in compression concrete, and weaker, less stiff but more ductile in tension concrete. One composite beam exhibited 22% redistribution of support reaction at 88% of the failure load. Failure occurred primarily at the connections, which then gradually led to fracture of the LVL as a secondary mode of failure.

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Research Details


Author(s):

W.M. Sebastian

J. Mudie

G. Cox

M. Piazza

R. Tomasi

I. Giongo


Research Organisation(s):

Universities of Bristol and Trento


Date Published:

15/01/2016