负荷加固情况下钢梁性能和强度的试验研究

对4点加载的W型梁进行试验,分析抗弯构件在加载作用下进行加固时的性能和承载力。试验结果显示:对于侧向扭转屈曲主导的破坏模式下的大跨构件,未加固梁的预加载力增加53%会导致加固梁的侧向屈曲荷载最多减少14.2%,但是预加载对构件极限荷载没有影响。对相同加固方式下跨度较短的构件进行试验发现:未加固梁的预加载增加50%会导致加固梁的极限承载力减少13%。然后,当构件在加载或者不加载情况下进行加固时,其挠曲变形变化并不大。对于由弯曲屈服主导的破坏模式下的构件,预加载对于加固构件的极限承载力并没有影响。

Experimental Behavior and Strength of Steel Beams Strengthened While Under Load

W-shaped beams were tested under a four-point loading to investigate the behavior and capacity of flexural members strengthened while under load. Experimental results revealed that for specimens tested at a long span and failing predominantly by lateral-torsional buckling, an increase in the preload level up to 53% of the capacity of the unstrengthened beam resulted in a maximum decrease of 14.2% in the lateral buckling load of the strengthened beam but the variation in the ultimate loads was insignificant ...