Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Experimental and Numerical investigation on Pile Foundation Underpinning Structure System in Urban Overpass

Lei Yan
,
Xiaoying Gou
* ORCID logo ,
Zhengchao Guo
* ,
Xin Zhang
,
Yu Jiang
,
Xingwen Ran
,
Guanwen Chen
,
Kefeng Yue
Version 1 : Received: 13 September 2023 / Approved: 13 September 2023 / Online: 14 September 2023 (04:59:22 CEST)

A peer-reviewed article of this Preprint also exists.

Yan, L.; Gou, X.; Guo, Z.; Zhang, X.; Jiang, Y.; Ran, X.; Chen, G.; Yue, K. Experimental and Numerical Investigation on Pile Foundation Underpinning Structure System in Urban Overpass. Materials 2023, 16, 6576. Yan, L.; Gou, X.; Guo, Z.; Zhang, X.; Jiang, Y.; Ran, X.; Chen, G.; Yue, K. Experimental and Numerical Investigation on Pile Foundation Underpinning Structure System in Urban Overpass. Materials 2023, 16, 6576.

Abstract

In view of the complexity of the pile foundation underpinning structure system and the stringent requirements of the construction process, this paper briefly describes the necessity of introducing epoxy resin reinforcing adhesive of planting rebar in the design of pile foundation underpinning beam structure to im-prove the mechanical properties of the underpinning beam new and old concrete joint surfaces and proposes a new type of pile foundation underpinning beam system construction method by “chiseling + prestressed reinforcement + epoxy resin reinforcing adhesive”. This paper uses an actual pile foundation underpinning project of an urban overpass as a prototype, designs and creates a model structure with a similarity ratio of 1/6, and performs repeated pro-gressive static loading tests to study the load carrying capacity, displacement change, and other properties of the underpinning structure, as well as analyses and distorts the overall working performance and failure mode of them. On this basis, the prototype structure's finite element analysis model was built, and the finite element analysis results were compared with the test results to get the mechanical properties and deformation characters of the actual pile foundation under-pinning structure system corresponding to the actual underpinning beam load. This paper's study can lay the theoretical and experimental foundation for the smooth development of similar projects.

Keywords

Pile foundation replacement beam construction; Polymer reinforced planting bar adhesive; interface between new and old concrete; experiment; finite element simulation analysis

Subject

Engineering, Civil Engineering

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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