高强钢筋活性粉末混凝土梁抗弯性能试验研究
发布时间：2018-08-22 10:06
【摘要】：为研究高强钢筋活性粉末混凝土(RPC)梁在弯矩作用下的受力特性和其抗弯性能的影响因素,设计制作20根高强钢筋RPC矩形梁进行抗弯承载力试验,分析梁的破坏形态、荷载~挠度曲线、裂缝的发展和分布,研究配筋率和钢筋强度对抗弯性能的影响规律。结果表明:RPC适筋梁的正截面破坏过程与普通混凝土梁相似,表现出良好的延性,少筋梁和无筋梁具有一定的延性;相同钢筋强度RPC梁的开裂弯矩和极限承载力随配筋率增加而增大;相同配筋率时,RPC梁的极限承载力随钢筋强度增加而增大,但钢筋强度对开裂弯矩影响不大;试验过程中,梁的截面应变符合平截面假定;根据简化理论计算的RPC梁极限弯矩值和试验值吻合良好。
[Abstract]:In order to study the mechanical characteristics of high strength reinforced reactive powder concrete (RPC) beams under the action of bending moment and the influencing factors of their flexural properties, 20 high strength reinforced RPC rectangular beams were designed and fabricated to carry out flexural bearing capacity tests, and the failure modes of the beams were analyzed. The load-deflection curve, the development and distribution of cracks, and the influence of reinforcement ratio and reinforcement strength on the flexural properties are studied. The results show that the normal section failure process of the beam with appropriate reinforcement is similar to that of the normal concrete beam, and it shows good ductility, and the beam with less reinforcement and without reinforcement has a certain ductility. The cracking moment and ultimate bearing capacity of RPC beams with the same reinforcement strength increase with the increase of reinforcement ratio, and the ultimate bearing capacity of RPC beams with the same reinforcement ratio increases with the increase of reinforcement strength, but the strength of steel bars has little effect on the cracking moment. The cross section strain of the beam accords with the assumption of plane section, and the ultimate moment value of RPC beam calculated according to the simplified theory is in good agreement with the experimental value.
【作者单位】： 北京交通大学土木建筑工程学院;中铁第一勘察设计院集团有限公司;
【基金】：中国铁路总公司科技研究开发计划课题(2014G010-D)~~
【分类号】：TU375.1
[Abstract]:In order to study the mechanical characteristics of high strength reinforced reactive powder concrete (RPC) beams under the action of bending moment and the influencing factors of their flexural properties, 20 high strength reinforced RPC rectangular beams were designed and fabricated to carry out flexural bearing capacity tests, and the failure modes of the beams were analyzed. The load-deflection curve, the development and distribution of cracks, and the influence of reinforcement ratio and reinforcement strength on the flexural properties are studied. The results show that the normal section failure process of the beam with appropriate reinforcement is similar to that of the normal concrete beam, and it shows good ductility, and the beam with less reinforcement and without reinforcement has a certain ductility. The cracking moment and ultimate bearing capacity of RPC beams with the same reinforcement strength increase with the increase of reinforcement ratio, and the ultimate bearing capacity of RPC beams with the same reinforcement ratio increases with the increase of reinforcement strength, but the strength of steel bars has little effect on the cracking moment. The cross section strain of the beam accords with the assumption of plane section, and the ultimate moment value of RPC beam calculated according to the simplified theory is in good agreement with the experimental value.
【作者单位】： 北京交通大学土木建筑工程学院;中铁第一勘察设计院集团有限公司;
【基金】：中国铁路总公司科技研究开发计划课题(2014G010-D)~~
【分类号】：TU375.1
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