COMPRESSIVE STRENGTH ANALYSIS OF A STEEL BOLTED CONNECTION UNDER BOLT LOSS CONDITIONS (original) (raw)

Thermal strength analysis of a steel bolted connection under bolt loss conditions

Eksploatacja i Niezawodnosc – Maintenance and Reliability, 2022

The aim of the paper is to analyse an exemplary bolted connection under the conditions of loss of bearing capacity of some fasteners in the connection. The presented tests are numerical and concern an asymmetric bolted connection. The joined elements in the connection were modelled as 3D finite elements, and the fasteners were treated as hybrid models consisting of rigid heads and nuts, and flexible beams between them. The bolted connection was first preloaded according to six different tensioning orders using a standardised force. After all bolts were tensioned, the selected bolts were removed, simulating bolt damage. The connection was then tested for external loads with temperatures ranging from 20 to 600°C. The influence of loosening the connection on the load in the remaining bolts at the operational stage of the connection was investigated. The calculation results were compared with the test results for a healthy bolted connection. It was shown that the bearing capacity of the connection in the damaged state decreased by 13%

FINITE ELEMENT ANALYSIS OF BEAM-BEAM BOLTED CONNECTION UNDER PURE MOMENT

In structural engineering, the main purpose is to maintain structural stability against the effect of various forces acting on the structure. Also, when comparing steel and RC structures, the design of the steel structure focuses primarily on the joints. Proper and effective connections play an inevitable role in maintaining the structural stability of the steel structure. Currently, bolts are widely used fastener to connect steel connections. This project is an attempt to determine the influence of shear capacity by gauge distance on bolted connection. In order to achieve this objective, Finite Element Analysis were carried out in Ansys workbench 2021 r2. The analysis consists of 24 parametric studies that are carried out on 24 models. Each models are differ by the types of bolt hole clearance, bolt diameter, gauge distance and cleat angle used. The entire parametric study is mainly followed by using 10.9 High Yield Friction Grip (HYFG) bolt of diameter 16 mm and 20 mm.

Numerical Analysis of a Double Shear Standard Bolted Connection Considering Monotonic Loadings

Engineering Structures and Technologies

The behaviour of standard bolted steel connections submitted to monotonic loads, through the use of numerical models, is presented in the current paper. The bolted connections allow speed up constructive processes in an increasingly competitive and globalized world in which the costs are a decisive factor in the development of a project. The use of computational tools in the analysis of bolted connections becomes determinant, mainly for new solutions or solutions less explored in terms of design codes. Throughout the years, bolted connections have been suffering transformations resulting from research activities performed by many authors. Rivets have been replaced by bolts, the main achievement being the pre-stressed bolts. Methodologies based on finite element analyses were proposed for double shear bolted connection. The non-linear behaviour of these connections is investigated and their performances are compared. In the numerical modelling of the bolted connection, linear elastic...

Finite element investigation on the structural behaviour of cold-formed steel bolted connections

Engineering Structures, 2001

A finite element model with three-dimensional solid elements was established to investigate the bearing failure of cold-formed steel bolted connections under shear. It was demonstrated (Chung and Ip. Engineering Structures 2000;22:1271-1284) that the predicted load-extension curves of bolted connections in lap shear tests followed closely to the measured load-extension curves provided that measured steel strengths and geometrical dimensions were used in the analysis. Furthermore, it was shown (Chung and Ip.

An Investigation on the Ultimate Strength of Cold-Formed Steel Bolted Connections

Engineering, Technology & Applied Science Research, 2017

This paper presents experimental results and finite element analysis of the cold-formed steel bolted connection under shear loading. Experiments are conducted to study the ultimate behaviors, such as ultimate strength and failure mode of connections. The samples were fabricated into three different groups, single bolted, double bolted and quadruple bolted connection. Material properties were determined by tensile coupon testing. Bearing failure modes were detected in the bolted connection tests. The ultimate capacities were compared with the nominal strengths calculated using the AISI (2012). The comparisons show that the nominal strength parameters predicted by this specification is conservative. The finite element analysis shell elements were used to model the cold-formed steel plate while solid elements were used to model the bolted fastenings for the purpose of studying the structural behavior of bolted connections. Material nonlinearities, contact problem and geometry nonlinear...

Experimental model of the behaviour of bolted angles connections with stiffeners

International Journal of Steel Structures, 2016

This paper presents the experimental results of twenty full scale specimens of steel bolted connections beam-to-column with top-and-seat angles in six groups, labelled L91-tp8, L82-tp8, L73-tp8, L91-tp10, L82-tp10 and L73-tp10 groups (L=length of top-and-seat angle, tp=stiffener thickness of top-and-seat angle), under static loading. This study was undertaken to analyse the influence of angles and beams with stiffeners on the behaviour of the beam-to-column joints. The main parameters observed are the evolution of the resistance, the stiffness, the rotation capacity, the ductility of a joint, and the energy dissipation capacity. The aim was to provide necessary data to improve the Eurocode 3.

Analysis on Shear Behavior of High-Strength Bolts Connection

Because of high cost of tests and numerical calculation using solid element of high-strength bolts connection in steel frameworks, it is important to find an accurate and simplified approach to describe the shear behavior of high-strength bolts connection. The paper aims to find a spring element to simulate the shear behavior instead of solid element in structure. Firstly, solid element model of high-strength bolt connection is established, which is proved correct and applicable comparing with existing typical shear tests. Then, base on the reliability of finite element model, the shear behavior of bolts connection is further discussed through a large number of parameter analyses. The three feature points and four stages of the simplified shear model are calibrated according to tests and calculation results. A simplified shear behavior model and hysteretic criterion of high-strength bolts connection are proposed. According to cases study, feasibility of the proposed model is validated. The proposed model gives a simple process to provide quite accurate results, which provides a great tool for engineering applications.

Unitary model for the analysis of bolted connections using the finite element method

Engineering Failure Analysis, 2019

This paper presents the numerical simulation of a model with one bolt connecting two or three plates using the finite element method. This unitary model with one bolt is validated by comparing its results with those obtained in the literature for three different types of applied load: tension, shear, and a combination of both. The results are also compared with the American and Brazilian design codes. The unitary model includes all necessary considerations: contacts between the plates and the nut, head and shank of the bolt; contact between the plates, as well as the friction between them; and pre-load on the bolt. Moreover, it responds properly to forces parallel and perpendicular to the contact surface between the plates including prying action effects and slip. These calibrated models can be then introduced on a model that represents a full connection through a relatively simple process using ANSYS APDL language, thus allowing the study of any bolted connection type.

Experimental and numerical investigations of an asymmetric multi-bolted connection preloaded and subjected to monotonic loads

Research Square (Research Square), 2022

The experimental tests of seven-bolted connection with an asymmetric contact area between the joined elements are presented. The research was divided into two stages. In the rst one, the connection was preloaded in a three-pass cycle. In the second stage, the connection was loaded with a monotonic alternating force applied at an angle of 30 degrees to the contact surface of the joined elements in order to generate compressive and shear forces in the connection. The tests were carried out with the use of the INSTRON 8850 testing machine. As a result of the research, the courses of forces in the bolts measured with use of resistance strain gauges and the relative displacements between the joined elements measured with an extensometer were shown. In the second part of the paper, the modelling of the connection in the convention of the nite element method is presented. The joined elements were modelled with use of spatial nite elements, and the fasteners-as a hybrid elements made of deformable beams, rigid heads and rigid nuts. The paper is completed with a comparison of the results obtained from the measurements and calculations, on the basis of which conclusions important from the point of view of the FEM analyst were drawn.

Behavior of extended end-plate bolted connections subjected to monotonic and cyclic loads

Engineering Structures, 2019

Extended end-plate bolted connections are widely used in the steel structures as moment resisting connections. Most of these connections are flexible or in other words semi-rigid. The present research aims to study the behavior of such connections under the effect of both monotonic and cyclic loadings using the Finite Element Method (FEM). For flexible connections, it is very important to obtain the moment-rotation relationship as well as the connection stiffness. This stiffness can be used to model the flexible connections in the conventional nonlinear stiffness analysis of steel frames. Parametric study was made on extended end-plate bolted beamcolumn connections subjected to both monotonic and cyclic loading to study the effect of number of parameters; shear force, diameter of bolt, thickness of head plate, and the effect of using head plate stiffener. Present parametric study shows that the value of shear force acting on the connection has a significant effect on the connection stiffness.