Deflection Estimation Based on the Thermal Characteristics of Composite Deck Slabs Containing Macro-Synthetic Fibers.

Dong-Hee Son,Baek-Il Bae,Hyo-Jun Ahn,Joo-Hong Chung,Chang-Sik Choi

doi:10.3390/ma14144052

Dong-Hee Son, Baek-Il Bae + Show 3 more

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https://doi.org/10.3390/ma14144052

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Abstract

The purpose of this study was to evaluate the structural performance of composite deck slabs containing macro-synthetic fibers. after a fire by proposing a deflection estimation method for non-fireproof structural decks. Therefore, this study evaluated the fire resistance performance and deflection of deck slabs mixed with macro-synthetic fibers. Afterward, the deflection estimation method considering the thermal characteristics of concrete and deck plates was proposed. A material test was first conducted to evaluate the mechanical properties of concrete mixed with macro-synthetic fibers. This test found that the compressive strength and elasticity modulus of concrete mixed with macro-synthetic fibers was greater than that of general concrete. A flexural tensile test confirmed that residual strength was maintained after the maximum strength was achieved. The fire resistance of the deck slab was adequate even when a fire-resistant coating was not applied. The internal temperature was lowest for the specimen with macro-synthetic fibers. Deflection was evaluated using previously published equations and standards. The deflection evaluation confirmed that the temperature distribution should be applied differently in the estimation method that uses the thermal load of the deck slab.

Highlights

IntroductionAs buildings have become taller, the number of steel structures has increased
A composite deck slab is economical because temporary work is unnecessary, and it can even serve as a formwork
This study examined the thermal properties of non-fireproof deck slabs and macrosynthetic fibers

Summary

Introduction

As buildings have become taller, the number of steel structures has increased. A steel deck was used only for formwork, in which a reinforcing bar was installed on the steel deck and concrete was poured. Steel decks have been used recently as structural members, such as a composite structure in which concrete and deck plates are integrated. Because the deck plate acts as a tension member, a separate reinforcing bar placement is not required [2,3]. Modern structural deck plates have a modified shape to increase the composite effect of deck plates and concrete, with the addition of a rib on the bottom steel plate and a Y-shape flange at the end of the rib [2,3]

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