Experimental Investigation on One Most Used Steel Joint with Intumescent Paint

Abstract

The modern steel structures use mostly the intumescent paintprotection against the fire. One of the main problems of these protective paints consists of the layer's thickness in order to optimize both the fire protection's problem and the costs of this protection's procedure. The authors offer some preliminary experimental results on intumescent paints layer's thickness optimization in order to assure as soon as possible the same heat transfer-gradient and also the same strength of the joint's members material.

The Intumescent Paint Layers Thickness Influence on the Load-Bearing Capacity of the Steel Joints

“…Subsequently, in [4], the authors started to investigate the cheapest one from fire-resistance point of view, at a reduced scale model (approximately at 1:5), presented in Figure 1. Fig.…”

“…Fig. 1 The analyzed beam-to-column connection; A -the screw-connections; B -the holes for external mechanical loading; C -the holes for external connection [4] In the first step of the investigation, the authors tried to find out some optimal relationship between the intumescent paint layer's thickness and the thermal field's uniformity of the joint during a simulated fire. They provided the joint (beam-to-column connection), previously of applying the paint, with thermo resistors: #1 -in column; #3 -in adjacent (here: horizontal) member, respectively in #2 -the connection zone, presented in the same Figure 1.…”

“…Fig. 1 The analyzed beam-to-column connection; A -the screw-connections; B -the holes for external mechanical loading; C -the holes for external connection [4] Advanced Materials Research Vol. 969 333…”

Failure of an Advanced Five Layers RT800 Composite

“…Maximum tensile strength, σ u and longitudinal Young's modulus, E, for typical fibers used in advanced composites can be determined in tensile tests from which characteristic curves follow [1,2,3,4,5,6,7]. In addition, in technical literature, the specific strength as well as the specific stiffness are defined [8,9,10,11,12,13,14,15].…”