非蒸养UHPC-钢板结构界面的受拉和剪切性能试验研究

发布时间：2018-01-03 15:34

本文关键词：非蒸养UHPC-钢板结构界面的受拉和剪切性能试验研究　出处：《工程力学》2017年09期 　论文类型：期刊论文

【摘要】：超高性能混凝土(UHPC)在组合结构和钢结构加固领域具有很大的应用潜力,其中UHPC-钢板界面的力学行为对整体结构组合性能的发挥起到关键作用。该文通过一系列受拉试验和推出试验,对五种常见的非蒸养UHPC-钢板界面形式进行了研究,包括光滑钢板界面、花纹钢板界面、撒入骨料的环氧胶粘剂界面、焊接弯起钢筋界面和栓钉连接界面。试验结果表明UHPC直接粘结强度较低且并不可靠;花纹钢板界面和环氧胶粘剂界面的粘结强度较高,但在受拉或无约束受剪时发生脆性破坏;焊接弯起钢筋界面和栓钉连接界面具有明显的规律性和延性,然而施加约束带来的承载力提升并不明显。该文重点研究了栓钉连接界面的力学性质,发现经典理论和现有规范严重低估了UHPC锥形破坏的承载力,提出更符合实际情况的变角度破坏面假设;此外,该文通过试验结果标定和验证了UHPC中栓钉连接件荷载-滑移关系的指数函数模型。
[Abstract]:Ultra high performance concrete (UHPC) has great application potential in the field of combined reinforcement structure and steel structure, the mechanical behavior of UHPC- steel plate interface play the overall structure of the combined performance plays a key role. In this paper, through a series of tensile test and launch test, five kinds of non autoclaved UHPC- plate interface forms. Study on common, including smooth steel plate interface, interface, interface and aggregate into epoxy adhesive, welding interface and curved steel stud connection interface. The test results show that the UHPC direct bonding strength is low and is not reliable; bond strength plate interface and epoxy adhesive interface is high, but in tension or no restriction shear brittle failure; curved steel welding interface and stud connection interface has the obvious regularity and ductility, but the constraint brought by enhancing the carrying capacity of the paper is not obvious. Focus on the mechanical properties of stud connection interface, find the classical theory and the existing norms seriously underestimated the bearing capacity of the damaged UHPC cone, put forward more in line with the actual situation of the variable angle failure surface assumption; in addition, the test results of calibration and verification of the UHPC stud connector load slip relationship of the exponential function model.

【作者单位】：清华大学土木工程系;清华大学土木工程安全与耐久教育部重点实验室;
【基金】：国家自然科学基金项目(51478245)
【分类号】：TU398.9
【正文快照】： 超高性能混凝土(Ultra-High PerformanceConcrete,以下简称UHPC)是一种高强度、高韧性和高耐久性的水泥基复合材料。UHPC由级配良好的石英细砂、水泥、石英粉、硅灰、高效减水剂以及钢纤维等配制而成。其组分具有高细度和高活性,充分水化后内部的孔隙与微裂缝少,经过高温蒸汽

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