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本文介绍了44根纤维混凝土梁的研究结果。梁的截面为38×76毫米,长度为457毫米,砂浆配合比(水泥:砂:水)1:2:2.5,配制了短切镀铜钢纤维,配筋率分别为0％、0.5％、1％和2％。梁养护7天后用两个集中力进行了抗弯试验,在试验过程中测定了梁的荷载、挠度和支座凹槽处的裂缝宽度,以及梁的表面裂缝宽度和长度。研究了试件尺寸对极限应力强度系数、破坏能量和凹槽处的表面裂缝开展宽度等影响。
This article presents the results of a study of 44 fiber reinforced concrete beams. The cross section of the beam is 38×76 mm, the length is 457 mm, and the mortar mix ratio (cement:sand:water) is 1:2:2.5. A short-cut copper-plated steel fiber is prepared with a reinforcement ratio of 0%, 0.5%, respectively. 1% and 2%. After 7 days of beam curing, two concentrated forces were used to perform bending tests. During the test, the load, deflection, and crack width of the support groove were measured, as well as the surface crack width and length of the beam. The effects of specimen size on the ultimate stress intensity factor, the damage energy and the surface crack width at the groove were studied.