Full Session with Abstracts
The response of steel structures exposed to fire loading has gained the attention of engineers and researchers in recent decades. This has been motivated by historical fire events, which resulted in significant structural damage and in some cases system-level collapse. The socio-economic consequences of the collapse can be dire as has been previously demonstrated Therefore, it is prudent that the topic of system stability under fire being taught to students prior to entering the work force. The importance of such stems from the fact that current design guidelines and provisions of steel structures do not contain sufficient information to evaluate the potential for collapse of steel structures under realistic fire events. Moreover, the provisions do not address the effects of realistic fire conditions on the thermal and structural interactions among frame members and global system response. Therefore, there is an obvious need to quantitatively understand the behavior of steel framed buildings under realistic fire conditions at the local and system levels. In this presentation, the approach used for teaching the fundamentals of structural stability under fire at Colorado State University will be provided. This will include the fundamentals of structural stability under fire including lateral instability and vertical system collapse. In addition, the presentation will also highlight the term project that is designed to enhance the students’ ability to work outside of the confines of a well-defined single issue. It is intended to help provide a broad insight on buckling response of steel columns (as the most important structural component that controls the stability of buildings) under fire conditions throughout conducting analytical and numerical analyses. It is also intended to encourage group debate, coordination of contributions, and reporting. The analytical analysis is conducted using the current AISC provision on fire design of steel structures. The numerical model of steel column is created in ABAQUS using shell element with appropriate definition of temperature-dependent thermal and mechanical properties of structural steel according to the current AISC provision. The numerical analysis consists of conducting uncoupled thermal-stress analysis on a steel frame with pinned-pinned, fixed-fixed, and fixed-pinned steel column under uniform longitudinal temperature. The ASTM E119 and the European parametric fire curve are considered as thermal load on steel column. The structure is assumed as an office building with the appropriate compartment and thermal load parameter for the development of the parametric fire curve.