An improved and robust finite element model for simulation of thin-walled steel bolted connections

Numerical Modelling of Thin-walled Purlins Connection to the Supporting Structure☆

Introduction. Rotational stiffness of a joint in modular building frames is the subject of this research. The stiffness of joints has a direct impact on the analysis of building structures. However, Russian design standards lack any clear instructions concerning this characteristic. Modular buildings have non-standard joints; therefore, it is necessary to study their rotational stiffness. The purpose of this work is to differentiate rigid joints, connecting a channel beam to a square pipe column, from semi-rigid ones. \nMaterials and methods. Joints are classified according to Eurocode 3, that sets the limits for pinned, rigid and semi-rigid joints. The component-based finite element model implemented in the IDEA StatiCA software package is used to calculate the value of initial rotational stiffness. Two types of joints were studied: one that has an angle stiffener, and the other that has none. \nResults. The values of rotational stiffness of beam-column joints are obtained. It’s been identified that the joints of spans, typical for modular buildings, having no angle stiffeners, should be classified as semi-rigid and their rotational stiffness should be taken into account in designs. The variability of rotational stiffness of joints, having angle stiffeners, is nonlinear. If the dimensions of an angle stiffener are close to those of the cross section of a column, rotational stiffness rises steeply and joints turn rigid. \nConclusions. A nomogram was made for various sections of channels and pipes having minimum angle stiffener dimensions, ensuring the rigidity of beam-column joints. The nomogram is recommended as a guidance for setting angle stiffener dimensions. \nAcknowledgements. The co-authors would like to express gratitude to the editorial staff for the fast preparation of this article for publication. The co-authors are also grateful to the reviewer for his constructive feedback that has enabled them to improve the text of the article.

Research into the stiffness of beam-column joints of modular prefabricated buildings

This paper presents the overview of the numerical design model of welds in structural steels using finite element shell element. Many researches are emerging in the field of advanced modelling of welds in steel connections by using finite element analysis in order to represent accurate geometry and stiffness of welds. There are several weld modelling techniques used for the computation of structural hot spot stresses in fatigue; oblique shell elements, rigid links and increased thickness techniques. The article intends to eliminate the gaps in knowledge about the numerical modelling of welds using shell elements to compute the direct resistance of the welds in structural steels.

Numerical Modelling for Resistance of Welds in Steel Structures from High‐Strength Steel

This paper introduces component based finite element model (CBFEM) which is a new method to analyse and design connections of steel structures. Design focused component model (CM) is compared to finite elements models (FEM). Procedure for composition of a model based on usual production process is used in CBFEM. Its results are compared to those obtained by component method for portal frame eaves moment connection with good agreement. Design of moment resistant column base is demonstrated by a case loaded by two directional bending moments and normal force. Interaction of several connections in one complex joint is explained in the last example. This paper aims to provide structural engineers with a new tool to effectively analyse and design various joints of steel structures.

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D. Kolaja

Papers

Structural Analysis and Design of Steel Connections Using Component Based Finite Element Model (CBFEM)

Influence of joint stiffness on design of steel members