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为了研究高强混凝土梁的抗剪性能,设计了5根剪跨比为2.6的高强混凝土梁,在集中荷载作用下来观察试件的裂缝发展和破坏形态,根据试验结果来分析不同混凝土强度和配箍率对抗剪性能和承载力的影响,并将实测承载力与我国《混凝土结构设计规范》(GB 50010—2010)和美国规范(ACI 318—11)进行对比。结果表明:高强混凝土梁的破坏形态与普通混凝土梁相似,配箍率的提高可以增加梁的承载力和延性;剪跨比为2.6的高强混凝土(C100)梁的承载力总体能满足我国规范,美国规范的安全储备高于我国规范。
In order to study the shear resistance of high-strength concrete beams, five high-strength concrete beams with a shear-span ratio of 2.6 were designed to observe the development and failure modes of cracks under concentrated loads. Based on the test results, Rate on the shear performance and bearing capacity, and compare the measured bearing capacity with the “Code for Design of Concrete Structures” (GB 50010-2010) and the American Code (ACI 318-11). The results show that the failure mode of high-strength concrete beam is similar to that of ordinary concrete beam. The increase of hoop ratio can increase the bearing capacity and ductility of the beam. The bearing capacity of high-strength concrete (C100) beam with shear-span ratio of 2.6 can meet the requirements of China’s standard, The United States standardized safety reserve is higher than China’s standard.