Abstract
4 Fire tests on hollow profiles showed that the fire exposure of locally unprotected steel surfaces can have a substantial influence on the fire resistance of load bearing structural members. Design me thods for calculating the fire resistance of protected steel members assume a completely protected steel member. In practice partial damage or loss of fire protection of structural steel members is not uncommon and may occur due to impact, improper application, accidental damage or removal in the area of connections and installations. Intumescent coatings have low resistance against mechanical impact. Moreover the insulating foam layer which forms is easily damaged. Therefore a better know ledge of the fire behavior of steel members with locally damaged fire protection is important to as sess the reliability of protected steel structures. To gain information on the behaviour of intumescent coatings with locally missing fire protection a set of fire tests on steel plates with partially missing protection were carried out. The test results were simulated using a finite element approach. The goal was to calibrate the numerical model and get an agreement between thermal simulation and fire test results in order to use the numerical model to investigate the fire behaviour of steel columns and beams with partial loss of fire protec tion. The agreement between tests and simulation is very good and shows the suitability of the finite element approach including the model for the local damage of protection to simulate the fire beha vior of steel columns and beams with partial loss of protection. Chapter 8 presents a parametric study which investigates the influence of size and location of missing fire protection on the fire resistance time of steel columns and beams. Even when only small areas of fire protection were removed from the load bearing member, a significant reduction in fire resis tance was observed. Locally missing fire protection can increase the risk of structural failure marked ly and may lead to progressive collapse of steel structures. It is therefore essential to avoid damaged intumescent fire protection by carrying out periodical inspections and repairs.
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