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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 (BASEL, SWITZERLAND) 2023; 16:6576. [PMID: 37834711 PMCID: PMC10573851 DOI: 10.3390/ma16196576] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 09/30/2023] [Accepted: 10/04/2023] [Indexed: 10/15/2023]
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 improve the mechanical properties of the reinforced beam new and old concrete joint surfaces and proposes a new type of pile foundation replacement 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 progressive static loading tests to study the load carrying capacity, displacement change, and other properties of the strengthened replacement 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 obtain the mechanical properties and deformation characters of the actual pile foundation underpinning 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.
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Affiliation(s)
- Lei Yan
- School of Civil Engineering, Chongqing Three Gorges University, Chongqing 404100, China; (L.Y.); (X.Z.); (Y.J.); (X.R.); (G.C.)
- School of Civil Engineering, Chongqing University, Chongqing 400045, China
| | - Xiaoying Gou
- School of Civil Engineering, Chongqing Three Gorges University, Chongqing 404100, China; (L.Y.); (X.Z.); (Y.J.); (X.R.); (G.C.)
| | - Zhengchao Guo
- School of Civil Engineering, Chongqing Three Gorges University, Chongqing 404100, China; (L.Y.); (X.Z.); (Y.J.); (X.R.); (G.C.)
| | - Xin Zhang
- School of Civil Engineering, Chongqing Three Gorges University, Chongqing 404100, China; (L.Y.); (X.Z.); (Y.J.); (X.R.); (G.C.)
| | - Yu Jiang
- School of Civil Engineering, Chongqing Three Gorges University, Chongqing 404100, China; (L.Y.); (X.Z.); (Y.J.); (X.R.); (G.C.)
| | - Xingwen Ran
- School of Civil Engineering, Chongqing Three Gorges University, Chongqing 404100, China; (L.Y.); (X.Z.); (Y.J.); (X.R.); (G.C.)
| | - Guanwen Chen
- School of Civil Engineering, Chongqing Three Gorges University, Chongqing 404100, China; (L.Y.); (X.Z.); (Y.J.); (X.R.); (G.C.)
| | - Kefeng Yue
- State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiao-Tong University, Chongqing 400074, China;
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Design of acetylene-modified bio-based tri-functional benzoxazine and its copolymerization with bismaleimide for performance enhancement. Polym Bull (Berl) 2022. [DOI: 10.1007/s00289-022-04639-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Forchetti Casarino A, Andrés Bortolato S, Casis N, Estenoz D, Spontón M. Novel Polybenzoxazine and Polybenzoxazine/Epoxy Thermosetting Copolymers containing Polysilsesquioxane Nanostructures for High-Performance Thermal Protection Systems. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Liu L, Wang F, Zhu Y, Qi H. Study on properties of copolymers based on different types of benzoxazines and branched epoxy resins. HIGH PERFORM POLYM 2022. [DOI: 10.1177/09540083221125862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Previous studies on linear epoxy (bisphenol A epoxy) resin/benzoxazine composites showed that with the addition of epoxy (EP) resin, the resulting copolymers exhibited an increased glass transition temperature ( Tg) ( Tg reached a maximum value at a specific content), improved flexural strength, lower heat resistance, and reduced tensile strength. Herein, branched EP resin (AG-80)/benzoxazine copolymers featuring novolac (N-box) and siloxane (Si-box) chains were prepared without any external curing agent. In both systems, the EP resin endowed the copolymers with an increased crosslinking density; however, Tg continued to increase with increasing EP content. In addition, the heat resistance of the copolymers gradually enhanced. Different types of benzoxazines have various effects on the properties of copolymers. In terms of mechanical properties, AG-80/N-box copolymers exhibited brittle fracture characteristics; with increasing EP content, the flexural strength of the copolymer decreased while the tensile strength increased. AG-80/Si-box copolymers exhibited ductile fracture characteristics, with gradual increases in flexural and tensile strengths. Furthermore, with increasing EP content, the molecular chain migration ability and network homogeneity of the AG-80/N-box copolymers decreased gradually. Alternatively, in the case of the AG-80/Si-box copolymers, the molecular chain migration ability remained unchanged and network homogeneity improved. Hence, the developed copolymers can be used as resin matrices for the fabrication of advanced composites.
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Affiliation(s)
- Lele Liu
- Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education, School of Materials Science and Engineering, East China University of Science & Technology, Shanghai, China
| | - Fan Wang
- Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education, School of Materials Science and Engineering, East China University of Science & Technology, Shanghai, China
| | - Yaping Zhu
- Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education, School of Materials Science and Engineering, East China University of Science & Technology, Shanghai, China
| | - Huimin Qi
- Key Laboratory of Specially Functional Polymeric Materials and Related Technology of Ministry of Education, School of Materials Science and Engineering, East China University of Science & Technology, Shanghai, China
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Wang Z, Li R, Qin Q, Al Hassan M, Dayo AQ, Liu W, Wang J. Curing kinetics and mechanical properties of cyanate ester/hyperbranched benzoxazine copolymers. POLYM ADVAN TECHNOL 2022. [DOI: 10.1002/pat.5624] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Zhicheng Wang
- Institute of Composite Materials College of Materials Science and Chemical Engineering, Harbin Engineering University Harbin China
| | - Runjie Li
- Institute of Composite Materials College of Materials Science and Chemical Engineering, Harbin Engineering University Harbin China
| | - Qirui Qin
- Institute of Composite Materials College of Materials Science and Chemical Engineering, Harbin Engineering University Harbin China
| | - Mohamadou Al Hassan
- Institute of Composite Materials College of Materials Science and Chemical Engineering, Harbin Engineering University Harbin China
| | - Abdul Qadeer Dayo
- Department of Chemical Engineering Balochistan University of Information Technology, Engineering and Management Sciences Quetta Pakistan
| | - Wenbin Liu
- Institute of Composite Materials College of Materials Science and Chemical Engineering, Harbin Engineering University Harbin China
| | - Jun Wang
- Institute of Composite Materials College of Materials Science and Chemical Engineering, Harbin Engineering University Harbin China
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Design, synthesis, flame retardancy and dielectric properties of novel aromatic hyperbranched benzoxazine. REACT FUNCT POLYM 2022. [DOI: 10.1016/j.reactfunctpolym.2021.105098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Thalji MR, Ibrahim AA, Ali GA. Cutting-edge development in dendritic polymeric materials for biomedical and energy applications. Eur Polym J 2021. [DOI: 10.1016/j.eurpolymj.2021.110770] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Cai W, Wang Z, Shu Z, Liu W, Wang J, Qiu J. Development of a fully bio-based hyperbranched benzoxazine. Polym Chem 2021. [DOI: 10.1039/d1py01451j] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A fully bio-based hyperbranched benzoxazine derived from renewable raw materials exhibits excellent thermal properties.
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Affiliation(s)
- Wanan Cai
- Institute of Composite Materials, Key Laboratory of Superlight Material and Surface Technology of Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, PR China
| | - Zhicheng Wang
- Institute of Composite Materials, Key Laboratory of Superlight Material and Surface Technology of Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, PR China
| | - Zhaohui Shu
- Institute of Composite Materials, Key Laboratory of Superlight Material and Surface Technology of Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, PR China
| | - Wenbin Liu
- Institute of Composite Materials, Key Laboratory of Superlight Material and Surface Technology of Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, PR China
| | - Jun Wang
- Institute of Composite Materials, Key Laboratory of Superlight Material and Surface Technology of Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, PR China
| | - Jian Qiu
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun 130022, PR China
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