A case study on the impact of fiber distribution on X-connections of complex-shaped UHPFRC footbridges cast with recyclable formwork

IF 6.5 2区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Case Studies in Construction Materials Pub Date : 2024-12-09 DOI:10.1016/j.cscm.2024.e04064
Duc Anh Tran , Sandrine Heroux , Luca Sorelli , Mahdi Ben Ftima , David Conciatori , Christian Dupuis , Samuel Bernier-Lavigne
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Abstract

Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) is emerging as a transformative construction material, enabling the creation of slender, thin architectural structures with outstanding surface textures. This study examines the influence of fiber distribution on the mechanical behavior of the X-connection, a critical structural detail in a novel latticework concept for UHPFRC footbridges, while also introducing an innovative approach using recycled wax formwork for shaping complex geometries.
Following the architectural design process for the latticework UHPFRC footbridge, the methodology involves: (i) fabrication of fully recyclable wax formwork using CNC milling for two X-connection configurations with distinct crossing angles (i.e., the angle formed at the intersection of the X shape); (ii) gravity casting of UHPFRC, incorporating 1 % steel microfibers; (iii) application of the magnetic inductance method (MIM) for non-destructive testing to evaluate fiber distribution, supplemented by fiber counting and image analysis of cracked sections post-testing; (iv) mechanical testing of the X-connection under bending to assess structural performance; and (v) a nonlinear Finite Element Analysis (NLFEA) to comprehensively examine the impact of fiber distribution. The findings underscore the pivotal role of fiber distribution in determining the ductility and strength of X-connections within the latticework UHPFRC footbridge, elucidating both the strengths and constraints of contemporary magnetic methods integrated with the Finite Element Method for accurately predicting the effects of fiber distribution.
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来源期刊
CiteScore
7.60
自引率
19.40%
发文量
842
审稿时长
63 days
期刊介绍: Case Studies in Construction Materials provides a forum for the rapid publication of short, structured Case Studies on construction materials. In addition, the journal also publishes related Short Communications, Full length research article and Comprehensive review papers (by invitation). The journal will provide an essential compendium of case studies for practicing engineers, designers, researchers and other practitioners who are interested in all aspects construction materials. The journal will publish new and novel case studies, but will also provide a forum for the publication of high quality descriptions of classic construction material problems and solutions.
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