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对3个钢筋混凝土(RC)约束梁试件和3个钢筋增强超高韧性水泥基复合材料(RECC)约束梁试件进行了升降温全过程耐火性能试验,研究了升降温全过程中梁端约束、受火时间等参数对梁试件高温下变形和内力的影响,比较了RECC约束梁和RC约束梁高温下的温度场分布、变形和内力。研究结果表明:RECC约束梁的截面测点温度低于RC约束梁,在相同的条件下,RECC约束梁的跨中挠度和梁端弯矩均小于RC约束梁;升温时间为60 min的RECC约束梁轴向变形峰值比RC约束梁低25%,RECC约束梁轴力比RC约束梁低18%,升温时间为120 min的RECC约束梁和RC约束梁轴向变形和轴力峰值比较接近;梁试件的反弯点位置在整个升降温过程中不断变化,在降温到某一时刻反弯点会基本消失。
Three RC beams and three REC specimens were tested for fire resistance during the whole process of temperature rise and cooling. During the whole process of lifting and cooling, the beam ends Restraint, fire time and other parameters on the deformation and internal force of beam specimens under high temperature. The temperature field distribution, deformation and internal force of RECC constrained beam and RC constrained beam under high temperature were compared. The results show that the cross-section temperature of the RECC restraint beam is lower than that of the RC restraint beam. Under the same conditions, the mid-span deflections and the bending moment of the RECC restraint beam are both less than those of the RC restraint beam. The RECC constraint The axial deformation peak value of beam with RC beam is 25% lower than that of RC beam, the axial deformation of RECC beam with RC beam is 18% lower than that of RC beam, and the temperature is 120 min. The bending point position of the specimen changes constantly during the whole temperature rising and cooling process, and the bending point will disappear basically at a certain temperature.