钢筋增强超高韧性水泥基复合材料约束梁耐火性能试验研究  

Experimental research on fire resistance of steel reinforced engineered cementitious composites restrained beams

作　　者：徐明[1] 杨大峰[2] 尹万云 余华春 陈忠范[1] 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096 [2]国网北京经济技术研究院,江苏徐州221005 [3]中国十七冶集团有限公司,安徽马鞍山243000

出　　处：《建筑结构学报》2016年第3期29-35,共7页Journal of Building Structures

摘　　要：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。In order to study the fire resistance of steel reinforced engineered cementitious composites （ECC） restrained beams, three reinforced concrete （ RC ） restrained beams and three steel reinforced ECC （RECC） restrained beams were tested during heating and cooling phases The influences of restraint and heating time on deformations and internal forces of the restrained beams were discussed. Differences of temperature distribution, deformations and internal forces between RC restrained beams and RECC restrained beams were compared. The results show that the temperature at measuring points of RECC restrained beams is less than the corresponding temperature of RC restrained beams. Under the same conditions, the mid-span deflection and bending moments at the beam ends of RECC restrained beams is less than RC restrained beams＇. The maximum value of the axial deformation of RECC beams is about 75% of RC beams＇ and the maximum value of the axial force of RECC beams is about 82% of RC beams＇ within 60 minutes of heating. The maximum values of the axial deformation and the axial force of RECC and RC beams are very close within 120 minutes of heating. The position of contraflexure point is changing during the experiment and it disappears during the cooling phase.

关 键 词：超高韧性水泥基复合材料(ECC) 约束梁 升降温 标准升温曲线 耐火性能 

分 类 号：TU375.1[建筑科学—结构工程] TU317.1