【摘要】 为研究超高性能混凝土（UHPC）轻型肋板的抗裂性能，设计了4个UHPC带肋板模型并进行加载试验，分析了试件的裂缝开展规律与破坏模式。在此基础采用有限元软件对试验进行模拟，分析了配筋率、纵向受拉钢筋屈服强度、肋板尺寸、UHPC抗压强度与UHPC抗拉强度对开裂弯矩的影响。结合现有规范，推导了轻型UHPC肋板的开裂弯矩计算方法。结果表明：开裂荷载受配筋率、肋高尺寸、肋宽尺寸、UHPC抗拉强度的影响较大，其中肋高尺寸的增加对开裂荷载的提升率最高，配筋率次之，而UHPC抗压强度和钢筋屈服强度对抗裂性能几乎没有影响。基于平截面假定，得到轻型UHPC肋板的开裂弯矩，其计算值与试验实测值、有限元计算值吻合度较好，可靠性较高。更多还原

【Abstract】 In order to study the crack resistance of lightweight ultra-high perfor mance concrete(UHPC) ribbed panels, four UHPC ribbed panel models were designed and subjected to loading tests. The crack development patterns and failure modes of the specimens were analyzed. On this basis, finite element software was used to simulate the tests, and the effects of reinforcement ratio, yield strength of longitudinal tensile reinforcement, rib dimensions, UHPC compressive strength, and UHPC tensile strength on the cracking moment were analyzed. Combined with existing specifications, a calculation method for the cracking moment of lightweight UHPC ribbed panels was derived. The results showed that the cracking load was significantly affected by the reinforcement ratio, rib height, rib width, and UHPC tensile strength. A mong these factors, increasing the rib height had the greatest effect on improving the cracking load, followed by the reinforcement ratio, whereas the UHPC compressive strength and the yield strength of the reinforcement had almost no effect on the crack resistance. Based on the plane section assumption, the cracking moment of the lightweight UHPC ribbed panels was determined. The calculated values agreed well with the experimental measurements and finite element simulations, demonstrating high reliability, which can provide a reference for design and engineering applications.更多还原