Experimental study on fatigue performance of assembled reinforced concrete beams after fire
Conducting research on the load-bearing performance of prefabricated reinforced concrete structures after a fire has important theoretical and practical significance for enhancing their disaster resistance capabilities.To simulate the performance of prefabricated reinforced concrete beam assembly connection nodes,four full-scale prefabricated reinforced concrete simply supported beam specimens with precast ends and grouted sleeve connections were designed.One specimen was subjected to static loading test after fire,and the other three specimens were subjected to fatigue resistance test under cyclic loading after fire.The results showed that the test beams subjected to fire exhibited ductile failure characteristics under static load,while fatigue failure exhibited obvious brittle failure characteristics;When the lower limit of cyclic load is the same,as the upper limit of cyclic load increases,the measured fatigue life of the test beam decreases significantly.The measured fatigue life at cyclic load amplitudes of 150 and 120 kN is 55.07％and 34.78％lower than that at a cyclic load amplitude of 90 kN,respectively,indicating that the cyclic load amplitude has a significant impact on the fatigue resistance performance of prefabricated reinforced concrete beams after fire.
万方数据
维普
