Global structural behavior in fire and consolidated testing of steel structures

摘要

The fire behavior of steel structures in prescriptive design is commonly assessed by fire tests onrnsingle structural members under standard fire special testing furnaces; however the behavior of an entire steelrnstructure is in most cases more complex due to a redistribution of loads (global behavior of the structure) asrna result of large deformations in fire or even a change in the structural system. Favorable structural behaviorrnof global structures was observed in full scale fire tests and in many real fires. However the huge costs of fullrnscale fire tests on global structures prohibit their wide use. Therefore fire tests on global structures are usuallyrnreplaced by numerical simulations. However numerical simulations have still difficulties to precisely modelrndetails like connections or cannot detect some failure modes if no test data is available (e.g. spalling, brittlernfailure modes, shear or anchorage failures, etc.). Consolidated testing merges testing and numerical simulations.rnData measured in the test become input for the numerical calculation and results from calculation control therntest. Consolidated testing is based on deformation and strain-based structural analysis and has a huge potentialrnfor fire safety and economy of structures and for the development of realistic structural modeling in fire. Thernpaper first describes the basic principles of a deformation-based approach to global structural behavior and itsrnstudy with consolidated testing technique. Then, it shows the benefits of considering global structural behaviorrnin fire and its assessment by consolidated testing for fire safety and gives some applications and impacts.