超高性能混凝土华夫板受力性能试验研究与数值模拟OA北大核心CSTPCD

Ultra-high performance concrete(UHPC)waffle panels have the advantages of light weight,high stiffness and load-bearing capacity,and have good application prospects in projects such as large-span bridge decks and building roofs.Four UHPC waffle panels model with a 1∶2 scale were designed and completed for static loading tests,with a focus on exploring the crack resistance,stiffness,load-bearing capacity,and mechanical characters of the UHPC waffle panels under four point and four edge support boundary conditions,and different transverse rib spacing.A fine finite element model was established using ABAQUS to further study the influence of design parameters such as the reinforcement ratio,distribution of longitudinal and transverse ribs,top plane thickness and rib height on the mechanical performance of UHPC waffle panels,and to propose optimization design suggestions.The test results show that the UHPC waffle panels do not crack under the designed wheel load during the four point loading stage.During the single point loading stage,the four point supported waffle panels undergo bending failure,mainly bearing longitudinal force.The four edge supported waffle panel undergoes punching failure with a significant increase in stiffness and load-bearing capacity.Properly increasing the transverse rib spacing and reducing the number of transverse ribs can make the bidirectional stress state of the UHPC waffle panels more obvious and the material utilization rate higher.The diameter of the tensile reinforcement at the bottom of the longitudinal and transverse ribs and the top plane thickness are the main factors affecting the stiffness and load-bearing capacity of the UHPC waffle panels.Based on the research results,a combination of 3 longitudinal ribs and 3 to 5 transverse ribs is recommended for UHPC waffle panels with a span of 5 to 6 meters,and the top plane thickness does not exceed 100 mm.