Crack Resistance of the Normal Section in Lightweight UHPC Ribbed Panels

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.