Mechanical Property of Precast Slab-Assembled Utility Tunnel with UHPC Connections
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摘要: 超高性能混凝土(UHPC)连接的预制板式拼装混凝土综合管廊由底板、侧壁和顶板组成,其中底板出筋并通过UHPC与侧壁纵筋形成搭接。为研究UHPC的连接预制板式拼装混凝土综合管廊的受力性能,基于商用有限元软件ABAQUS,建立了此类综合管廊的分析模型,开展了节点试验以验证模型关键构造的合理性。试件的破坏形态、承载力与延性均与有限元计算结果基本吻合。在此基础上,开展了有限元参数分析,主要研究参数包括轴压比(0.05,0.1,0.15)与UHPC后浇段的位置(底板上表面处、底板以上350 mm处、底板以上500 mm处)等。有限元分析结果表明:预制和现浇模型的破坏模式均为侧壁受弯破坏,预制模型比现浇模型的承载力低3%;与轴压比为0的综合管廊相比,轴压比为0.05,0.1,0.15模型的承载力分别提高了11.6%,15.4%,18.3%,延性系数分别降低了2.4%,5.4%,8.6%;UHPC后浇段的位置对管廊整体结构的承载力与延性影响不大。可见,UHPC连接的预制板式拼装混凝土综合管廊具有良好的受力性能。
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关键词:
- UHPC /
- 板式拼装混凝土综合管廊 /
- 有限元分析 /
- 力学性能
Abstract: A precast slab-assembled concrete utility tunnel connected by Ultra-High Performance Concrete (UHPC) consists of a base slab, sidewalls, and a roof slab, and the rebars protruding from the base slab are lap-spliced with the longitudinal reinforcement of the sidewall by UHPC. To study the mechanical properties of the precast slab-assembled concrete utility tunnel with UHPC connections, an overall model of the utility tunnel was established based on the commercial finite element software ABAQUS. A joint test of the utility tunnel was conducted to validate the model’s rationality. The failure modes, bearing capacity, and ductility of the specimens were in good agreement with the finite element calculation results. On this basis, a parametric finite element analysis was conducted, focusing on key parameters such as the axial compression ratio (0.05, 0.1, and 0.15) and the vertical location of the UHPC cast-in-place segment (at the base slab top surface, and 350 mm above it, and 500 mm above it). The finite element analysis results showed that both precast and cast-in-place models failed due to sidewall flexure, with the bearing capacity of the precast model being 3% lower than that of the cast-in-place model. Compared to the utility tunnel with an axial compression ratio of 0, the bearing capacities of the models with axial compression ratios of 0.05, 0.1, and 0.15 increased by 11.6%, 15.4%, and 18.3%, respectively, while their ductility coefficients decreased by 2.4%, 5.4%, and 8.6%, respectively. The location of the UHPC cast-in-place segment had little effect on the overall bearing capacity and ductility of the utility tunnel structure. In general, the precast slab-assembled concrete utility tunnel with UHPC connections has good mechanical properties and shows broad prospects for engineering applications. -
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