In this article, the static shear behavior of large-headed studs embedded in ultra-high-performance concrete was investigated by push-out test and numerical analysis. A total of nine push-out specimens with single and grouped studs embedded in ultra-high-performance concrete and normal strength concrete slabs were tested. In the testing process, only shank failure appeared without cracks occurring on the surface of ultra-high-performance concrete slab when the steel–ultra-high-performance concrete specimens reached ultimate shear capacity. The shear capacity of specimens with large studs embedded in ultra-high-performance concrete slab increased by 10.6% compared those in normal concrete, and the current design codes such as Eurocode4, AASHTO LFRD 2014, and GB50017-2003 all underestimate the shear capacity of such kind of steel–ultra-high-performance concrete composite structures according to experimental results. Numerical models were established using ABAQUS with introducing damage plasticity material model. The influence of stud diameter, concrete strength, thickness of clear cover, and spacing of studs on the static shear behavior was thoroughly investigated via parametric analysis. Based on the experimental and numerical analysis, the existence of wedge block and the decrease of axis force are beneficial for improving the shear capacity of stud shear connectors.

中文翻译：

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嵌入超高性能混凝土中的大型螺柱剪力连接件的剪切行为

在本文中，通过推出试验和数值分析研究了嵌入超高性能混凝土中的大头螺柱的静剪切行为。总共测试了九个带有嵌入超高性能混凝土和普通强度混凝土板的单个和成组立柱的推出试样。在试验过程中，当钢-超高性能混凝土试件达到极限抗剪承载力时，超高性能混凝土板表面仅出现杆部破坏，未出现裂纹。与普通混凝土相比，嵌入超高性能混凝土板的大螺柱试件的抗剪能力提高了 10.6%，目前的设计规范如 Eurocode4、AASHTO LFRD 2014、GB50017-2003根据试验结果均低估了此类钢-超高性能混凝土组合结构的抗剪承载力。利用ABAQUS建立数值模型，引入损伤塑性材料模型。通过参数分析彻底研究了螺柱直径、混凝土强度、透明覆盖层厚度和螺柱间距对静剪性能的影响。根据实验和数值分析，楔块的存在和轴力的减小有利于提高螺柱剪力连接件的抗剪能力。通过参数分析彻底研究了透明覆盖层的厚度和螺柱间距对静态剪切行为的影响。根据实验和数值分析，楔块的存在和轴力的减小有利于提高螺柱剪力连接件的抗剪能力。通过参数分析彻底研究了透明覆盖层的厚度和螺柱间距对静态剪切行为的影响。根据实验和数值分析，楔块的存在和轴力的减小有利于提高螺柱剪力连接件的抗剪能力。