UHPC-混凝土-钢组合板节点抗弯性能试验研究和理论分析

Experimental Study and Theoretical Analysis of Flexural Performance of UHPC-Concrete-Steel Composite Slab Joints

摘要

超高性能混凝土(UHPC)-混凝土-钢组合板凭借其卓越的物理力学性能成为解决装配式地下结构严峻耐久性问题的理想构件形式．然而,由于其材料特性、结构形式和施工工艺与传统钢筋混凝土构件存在较大差异,现有的构件拼装节点难以直接应用于这种新型组合板．为此,本文在已有节点形式的基础上开发了平接和榫接两种新型UHPC-混凝土-钢组合板连接节点,通过节点受弯试验测试了节点在弯矩作用下的整体工作性能和破坏模式；结合数值分析方法,探究了关键设计参数对节点抗弯性能影响规律及其作用机制；最后,根据试验和数值分析结果提出了节点抗弯刚度和抗弯承载力计算方法．研究结果表明：节点的抗弯承载力由受拉区连接螺栓强度控制,其典型破坏模式为连接螺栓受拉断裂；新型连接节点的抗弯承载力与变形能力的匹配度较好,正常使用阶段具有足够的变形控制能力,峰值弯矩作用下节点的接缝张开量小于2 mm；增大连接螺栓预紧力可提高节点的早期抗弯刚度,但对节点承载能力影响有限；适度施加轴向压力可在提高节点早期抗弯刚度的同时提升节点抗弯承载力；所提出的节点抗弯刚度和承载力计算方法具有较好适用性,可供实际工程设计参考．

Abstract

Owing to their exceptional physical and mechanical properties,ultra-high performance concrete(UHPC)-concrete-steel composite slabs have emerged as an ideal solution to addressing the severe durability challenges of prefabricated underground structures. However,due to significant differences in material characteristics,structural configurations and construction techniques compared with the conventional reinforced concrete components,the existing joints cannot be directly applied to these novel composite slabs. To address this issue,two innovative joint types(i.e.,flat and tenon-groove joints) based on the existing joint configurations were developed in this paper. Flexural tests were conducted to evaluate the integrated performance and failure modes of these joints under bending moments. Numerical analysis was also employed to investigate the influences of key design parameters on the joint’s flexural performance and the underlying mechanisms. Finally,calculation methods for the joint’s bending stiffness and flexural capacity were proposed based on experimental and numerical results. The findings demonstrate that the flexural capacity of joints is governed by the tensile strength of connecting bolts in the tension zone,with the bolts’ tensile fracture being the typical failure mode. The novel connecting joints exhibit well-matched flexural capacity and deformation compatibility,and they provide sufficient deformation control in serviceability limit states,with their opening width remaining below 2 mm under peak bending moments. Increasing the bolt’s pretension force enhances the initial bending stiffness but has limited impact on the ultimate load-bearing capacity. Moreover,moderate axial compression improves both the initial bending stiffness and the flexural capacity. The proposed calculation methods for bending stiffness and flexural capacity show strong applicability and can serve as references for the design of practical engineering.

关键词

超高性能混凝土 / 组合板 / 连接节点 / 抗弯性能 / 预紧力 / 轴向压力

Key words

ultra-high performance concrete(UHPC) / composite slab / joint / flexural performance / preload / axial compression

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基金资助

国家自然科学基金资助项目(52178130)