【摘要】 为改善钢-超高性能混凝土(UHPC)华夫桥面板负弯矩区力学性能，以实际工程文昌桥为背景，提出了一种错缝型连接节点，并设计制作了4组钢-UHPC华夫桥面板节点试件进行抗弯试验，对比分析钢纤维类型、接缝类型等不同因素对试件破坏模式、承载力、钢筋应变、裂缝延展等性能的影响，并对钢-UHPC华夫桥面板在正常使用极限状态和承载能力极限状态下的力学性能进行评价分析。研究结果表明：各试件表现为典型的延性受弯破坏，裂缝集中于加载点下方和节点区域；错缝型节点和端勾型纤维均能有效提高试件的承载性能和变形能力；各试件裂缝发展曲线存在持缝和持力两个阶段，当裂缝宽度为3 mm时，对缝型试件DD较DZ承担荷载提升14.8%,而错缝型试件CD较CZ提升幅度仅为5.3%;在正常使用极限状态和承载能力极限状态下，UHPC华夫桥面板均具有优异的承载性能，并且满足“强节点、弱构件”设计要求。更多还原

【Abstract】 In order to improve the mechanical properties of the negative bending moment zone of steel UHPC waffle bridge decks, a staggered joint was proposed against the background of Wenchang Bridge, and four groups of steel UHPC waffle bridge deck joint specimens were designed and manufactured for bending tests. The effects of different factors, such as steel fiber type and joint type, on the failure mode, bearing capacity, reinforcement strain, crack extension and other properties of the specimens were compared and analyzed. The mechanical properties of the steel UHPC wiffle bridge deck undered the normal service limit state and bearing capacity limit state were evaluated and analyzed. The results showed that the specimens showed typical ductile bending failure, and the cracks were concentrated below the loading point and in the joint area; both staggered joints and end hook fibers could effectively improve the bearing capacity and deformation capacity of specimens; there were two stages in the crack development curve of each specimen: crack holding and force holding. When the crack width was 3 mm, the load borne by butted joint specimen DD was 14.8% higher than that of DZ, while the staggered joint specimen CD was only 5.3% higher than that of CZ; in the serviceability limit state and bearing capacity limit state, UHPC waffle bridge deck had excellent bearing performance, and met the design requirements of “strong joints, weak members”.更多还原