Descripción: Eurocode based design method for flange-plate connections of tubes under tension...
171
Second Conference of Junior Researchers in Civil Engineering
Eurocode based design method for flange-plate connections of tubes under tension Pál Turán BME Department of Structural Engineering, e-mail:
[email protected]
Abstract
In this paper an analytical model will be described to determine the resistance of flange-plate pipe joints in tension. This model is based on the Eurocode T - stub model. Later, an experimentally verified 3D finite element model will be presented. The results of the numerical and the analytical models will be compared. Two configurations were investigated with different geometry and welding type. In the first, there is no hole in the middle of the flange-plate; in the other there is a hole, which size is equal to the diameter of tube. In the second connection type there is two-sided fillet welding, while in the other there is only one-sided welding. Finally a statistical evaluation was carried out.
1. Introduction
Nowadays load-bearing structures made from tubes (CHS – Circular Hollow Section) are very commonly used because of their aesthetic appearance and favourable behaviour. Currently, for dimensioning of the flange-plate pipe connections the Eurocode Eurocode does not contain design method. The purpose of the present Eurocode T-stub model. The results of the article is to demonstrate an analytical model that bases on the Eurocode proposed new model will be compared to the result of a 3D finite element model. Furthermore a statistical evaluation will be performed. 2. The Eurocode based model
The Eurocode Eurocode 3 (EC 3) volume relation to the design of joints [1], [5] does not contain design method for the calculation of the resistance of flange-plate tube connections under tension. The proposed Eurocode Eurocode based model (in the later: ECBM ) which will be described bases on the L-stub model from the Eurocode Eurocode standard [5]. This L-stub model has been used to calculate the resistance of end-plate connection of I-beams, this model is a modification of the T-stub model. The details of the connection and the derivation of L-stub can be seen in Fig. 1. The main idea is taken from Katula [2], where the main principles and a conceptual drawings without details are described.
Fig. 1. Details 1. Details of the bolted connection, the evaluation of L-stub L-stub model [2]
The L-stub model contains two plates, a weld, and a bolt. In this connection model there are three failure modes (see in Fig. 2.): 1. complete yielding of the flange, 2. bolt failure with yielding of the flange, 3. bolt failure. The connections of tubes are generally point symmetrical; it is assumed that both the yield patterns and the Turán, P.: P.: Eurocode based design method metho d for flange-plate connections of tubes t ubes under tension
172
Second Conference of Junior Researchers in Civil Engineering
behaviour of the bolts are also symmetrical. The supposed failure patterns can be seen in Fig. 3. The following formulas have been derived based on the Eurocode standard. 1.
Q
NT,Rd
NT,Rd
2.
Q
NT,Rd+Q
NT,Rd
Mpl
3.
ΣBi
ΣBi
Mpl
MEd
