ABSTRACT
In order to ascertain the structural stability of the experimented beams, vertical constructive stiffeners were placed at the two supports, at the central point where the load was applied and at the two arbitrary locations between those points closer to the supports. LOADING AND MEASUREMENTS The load P applied to the beams was static in character, and was increased in steps starting from zero up to the level where the failure mechanism was
Figure 1 Types of tested beams
Experimental study on butt welded steel beams 385 observed. At each step of the loading, both the vertical deflections at the midspan by mechanical comparators with a sensitivity of 1/100 mm and the strains at various locations of the beam by strain-gauges were measured. EVALUATION OF THE RESULTS Ultimate Limit States: It is clear that a structural element can exhibit different ultimate limit states under various combinations of internal forces. Different ultimate loads can be calculated relating with the combinations of internal forces and their interaction.
