负弯矩作用下钢⁃UHPC 组合桥面板力学性能试验研究

作者：梁鹏¹,何惟煌²,黄庭华¹,陈善行²,陈浩²

作者简介：

梁鹏,高级工程师,E⁃mail: 370118969@ qq. com

作者单位：

1. 广西新发展交通集团有限公司,广西南宁 530029;2. 广东盛翔交通工程检测有限公司,广东广州 511400

基金项目：

∗广西重点研发计划(桂科 AB22080042)

摘要：

为明确钢纤维类型、普通钢筋配筋率、栓钉布置形式等参数对负弯矩作用下钢⁃UHPC 组合桥面板工作性能的影响,室内制作 5 个组合板大比例尺试验模型并完成静力弯曲试验,分析了钢纤维类型、普通钢筋配筋率、栓钉布置形式对组合板试件工作性能的影响规律. 试验结果表明:增加普通钢筋配筋率、调整(增加)栓钉布置、采用端钩钢纤维可提升组合板的极限承载力(≤11%),使整个桥面板受力更均衡,裂缝分布更均匀且无明显主裂缝,但会导致开裂荷载明显降低、更早出现裂缝;此外,上述措施还能显著提升钢⁃UHPC 组合桥面板的整体性能及结构刚度,可使底部钢板更均衡地参与受力,避免上部混凝土迅速开裂后产生钢板局部受力集中、屈曲破坏.

关键词：桥梁;组合桥面板;钢纤维混凝土;负弯矩;试验

English：

To clarify the influence of the parameters such as steel fiber type, ordinary reinforcementratio, and stud arrangement on the working performance of steel⁃UHPC composite bridge deck slab undernegative bending moment, five large⁃scale test models of composite slabs were made indoors and staticbending tests were completed. The influence of steel fiber type, ordinary steel reinforcement ratio, studarrangement on the working performance of composite slab specimens was analyzed. The experimentalresults show that increasing the reinforcement ratio of ordinary steel bars, adjusting ( adding ) thearrangement of studs, and using end hook steel fibers can improve the ultimate bearing capacity ofcomposite slabs ( not exceeding 11%), making the entire bridge deck slab more evenly stressed, withmore uniform crack distribution and no obvious main cracks, but it will lead to significant reduction incracking load and earlier occurrence of cracks; In addition, the above measures can significantly improvethe overall performance and structural stiffness of the steel⁃UHPC composite bridge deck slab, enablingthe bottom steel plate to participate in stress more evenly and avoiding local stress concentration andbuckling failure of the steel plate caused by rapid cracking of the upper concrete.

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