Study of the Behaviour of Steel Angle Tension Connections in Fire
| dc.contributor.author | YESSAD, OUISSAM | |
| dc.date.accessioned | 2026-05-26T08:32:32Z | |
| dc.date.available | 2026-05-26T08:32:32Z | |
| dc.date.issued | 2026 | |
| dc.description | THESIS Submitted to obtain the diploma of DOCTORATE 3RD CYCLE LMD Speciality: Civil Engineering Option: Structure | en_US |
| dc.description.abstract | teel braced frames are considered one of the most effective strategies for ensuring structural resilience in earthquake zones such us Chlef (Algeria). However, structural safety under fire conditions remains a critical concern in civil engineering, particularly for steel structures, whose mechanical properties deteriorate significantly at elevated temperatures. This doctoral research focuses on the behaviour of bolted angle steel assemblies commonly used in braced steel frame systems under high temperature conditions. The primary objective of this study is to investigate the mechanical response and failure mechanisms of these connections through advanced numerical modelling, supported by standard design approaches under current structural codes. To achieve this, detailed finite element models were developed using ANSYS APDL (Ansys Parametric Design Language), which offers robust capabilities for nonlinear, temperature-dependent simulations. The FE models account for geometric nonlinearity, contact interactions, and temperature-sensitive material degradation, enabling accurate prediction of connection behaviour under fire loading conditions. A theoretical component-based model is developed to represent the mechanical behaviour of bolted connections in a more physically interpretable way, accounting for temperaturedependent material degradation, geometry, and contact behaviour. The model decomposes the connection into individual elements such as bolts, angle legs, and connected plates, each represented by spring-like components with stiffness and strength calibrated through numerical simulations. The proposed model is validated through a comparative study against results obtained from the Component-Based Finite Element Method (CBFEM), which has recently gained popularity in the structural fire engineering community for its accuracy and balance between complexity and usability. The comparison demonstrates that the theoretical model provides reliable predictions of connection behaviour under elevated temperatures, capturing essential features such as stiffness reduction, load redistribution, and failure mechanisms. This research contributes to a more accurate understanding of bolted connection behaviour in fire conditions. It proposes a simplified modelling strategy that could be implemented in design practice. It lays the groundwork for safer and more efficient design of braced steel structures subjected to fire. It opens up new research directions for experimental validation and extension vi to other types of connections and boundary conditions and above all it provides substantial data for future analysis | en_US |
| dc.identifier.uri | http://dspace.univ-chlef.dz/handle/123456789/2448 | |
| dc.publisher | KADA Abdelhak / LAMRI Belkacem | en_US |
| dc.subject | Angle connections | en_US |
| dc.subject | Finite element analysis | en_US |
| dc.subject | Tensile force | en_US |
| dc.subject | OUISSAM YESSAD | en_US |
| dc.title | Study of the Behaviour of Steel Angle Tension Connections in Fire | en_US |
| dc.type | Thesis | en_US |