Numerical analyses on flexural performance of prefabricated UHPC link slab

IABSE Congress, Ghent 2021: Structural Engineering for Future Societal Needs Pub Date : 1900-01-01 DOI:10.2749/ghent.2021.0801

B. Briseghella, Weibo Xu, Junqing Xue, Lin Jianhui, C. Nuti

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Abstract

The expansion joints in the multi-span simply supported bridge can be eliminated by using the link slab. The ultra-high performance concrete (UHPC) with high tensile strength and crack resistance is an effective material for the link slab. However, the cast-in-situ UHPC link slab need to be cured with steam curing. Therefore, the construction processes are complicated and the construction quality is difficult to guarantee. In this paper, the prefabricated UHPC link slab which can be assembled on site to simply the construction process, accelerate the construction speed and reduce the labor cost was proposed. Finite element models of the prefabricated and cast-in-situ UHPC link slabs under bending were built by using ABAQUS. The ultimate bearing capacity of the prefabricated link slab was nearly the same of the cast in situ and the crack resistance slightly lower. Finally, the influence of the bolt (used to connect the prefabricated link slab) number and the distance from the bolt to the edge of the link slab on the crack resistance and ultimate bearing capacity of the prefabricated link slab were obtained.

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预制UHPC连接板抗弯性能数值分析

采用连接板可以消除多跨简支桥中的伸缩缝。超高性能混凝土(UHPC)具有较高的抗拉强度和抗裂性能，是一种有效的连接板材料。但现浇UHPC连接板需采用蒸汽固化。因此，施工工艺复杂，施工质量难以保证。为了简化施工过程，加快施工速度，降低人工成本，本文提出了可现场组装的预制UHPC连接板。采用ABAQUS软件建立了预制和现浇UHPC连接板在弯曲作用下的有限元模型。预制连接板的极限承载力与现浇连接板基本相同，抗裂能力略低。最后，分析了连接预制连接板的锚杆数量和锚杆到连接板边缘的距离对预制连接板抗裂能力和极限承载力的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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IABSE Congress, Ghent 2021: Structural Engineering for Future Societal Needs

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