Abstract
To investigate the temperature field and residual bearing capacity of the sandwich wall panels with GFRP skins and a wood-web core under a fire, three sandwich walls were tested. One of them was used for static load test and the other two for the one-side fire tests. Besides, temperature probe points were set on the sandwich walls to obtain the temperature distribution. Meanwhile, the model of the sandwich wall was established in the finite element software by the method of core material stiffness equivalent. The temperature distribution and performance reduction of materials were also considered. The residual bearing capacity of specimens after fire exposure were simulated considering the effects of web spacing, wall panel thickness and fire exposure time. Because the sandwich wall panels were stressed by eccentric compression after a fire, the residual compressive strength of the wall panel after the fire can be calculated through the eccentric loading analysis. Compared with the numerical results, it can be concluded that the effectiveness of calculation method of residual bearing capacity after fire exposure was proved.
Highlights
Fibre reinforced polymer (FRP)-wood sandwich structural components have been widely adopted in the civil engineering due to their advantages of low energy consumption, corrosion resistance, fast construction, convenient maintenance and thermal insulation
When the web spacing changed from 50 to 70 mm, the residual bearing capacity of members was increased by about 20%
Sandwich wall panels with glass fibre reinforced polymer (GFRP) skins and a wood-web core are taken as the research objection
Summary
Fibre reinforced polymer (FRP)-wood sandwich structural components have been widely adopted in the civil engineering due to their advantages of low energy consumption, corrosion resistance, fast construction, convenient maintenance and thermal insulation. To improve the bending strength and stiffness of flexural members, the glass fibre reinforced polymer (GFRP) webs are embedded in the core materials. Most of the studies focused on the material properties subjected to a fire, while it is hardly to find some references to introduce the investigations on the fire resistance of sandwich components under fire exposure, which has become a serious lack of scientific basis for the use of such components in building structures. The performance degradation mechanism subjected to a fire and residual bearing strength should be evaluated This is the motivation of this study. The variation distribution of the internal temperature field and residual bearing capacity were studied and analyzed, which provides a reference for the subsequent fire resistance design of sandwich components
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