{"title":"功能分级UHPFRC-HSC梁抗弯性能试验与数值研究","authors":"Ahmed M. Yousef, Nazeeh H. Atef, Ahmed M. Tahwia","doi":"10.1016/j.engfailanal.2025.110108","DOIUrl":null,"url":null,"abstract":"<div><div>The flexural behavior of Functionally Graded Reinforced Concrete (FGRC) beams using Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) with High-Strength Concrete (HSC) was investigated experimentally and numerically. Ten simply supported beams were subjected to four-point bending tests, with two varying ratios of longitudinal tensile reinforcement (<em>ρ<sub>l</sub></em>), to represent low and high ratios. The FGRC beams incorporate UHPFRC with a compressive strength of 157.2 MPa and HSC with 76.8 MPa. The UHPFRC layer was strategically placed in either the compression and tension zones or only in the compression zone of the beam. Experimental findings showed that FGRC beams demonstrated comparable ductility and strength to UHPFRC reference beams but at a much lower cost. FGRC beams with layers of UHPFRC on both the upper and lower layers, which make up 40 % of the total beam height, a beam with a high reinforcement ratio (<em>ρ<sub>l</sub></em> = 4.0 %) exhibited ductility of 261.6 % compared to HSC reference beam. It also carried 91.6 % of the flexural capacity of the pure UHPFRC beam. When the layers of UHPFRC accounted for 66.7 % of the beam’s height, the FGRC beams showed a notable increase in ductility, reaching 286.3 % compared to the HSC reference beam, and were able to carry 96.9 % of the load capacity of the UHPFRC beam. Raising <em>ρ<sub>l</sub></em> from 1.38 % to 4.0 % in the tested beams significantly improved flexural strength while maintaining good ductility. Design codes provided conservative flexural strength estimates, while sectional analysis per AFGC-2013, JSCE-2008, and KCI-2012 accurately predicted FGRC beam strength. The proposed numerical model showed a significant alignment with the test results of the simply supported UHPFRC-HSC beams.</div></div>","PeriodicalId":11677,"journal":{"name":"Engineering Failure Analysis","volume":"182 ","pages":"Article 110108"},"PeriodicalIF":5.7000,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Experimental and numerical study on flexural behavior of functionally graded UHPFRC-HSC beams\",\"authors\":\"Ahmed M. Yousef, Nazeeh H. Atef, Ahmed M. Tahwia\",\"doi\":\"10.1016/j.engfailanal.2025.110108\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The flexural behavior of Functionally Graded Reinforced Concrete (FGRC) beams using Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) with High-Strength Concrete (HSC) was investigated experimentally and numerically. Ten simply supported beams were subjected to four-point bending tests, with two varying ratios of longitudinal tensile reinforcement (<em>ρ<sub>l</sub></em>), to represent low and high ratios. The FGRC beams incorporate UHPFRC with a compressive strength of 157.2 MPa and HSC with 76.8 MPa. The UHPFRC layer was strategically placed in either the compression and tension zones or only in the compression zone of the beam. Experimental findings showed that FGRC beams demonstrated comparable ductility and strength to UHPFRC reference beams but at a much lower cost. FGRC beams with layers of UHPFRC on both the upper and lower layers, which make up 40 % of the total beam height, a beam with a high reinforcement ratio (<em>ρ<sub>l</sub></em> = 4.0 %) exhibited ductility of 261.6 % compared to HSC reference beam. It also carried 91.6 % of the flexural capacity of the pure UHPFRC beam. When the layers of UHPFRC accounted for 66.7 % of the beam’s height, the FGRC beams showed a notable increase in ductility, reaching 286.3 % compared to the HSC reference beam, and were able to carry 96.9 % of the load capacity of the UHPFRC beam. Raising <em>ρ<sub>l</sub></em> from 1.38 % to 4.0 % in the tested beams significantly improved flexural strength while maintaining good ductility. Design codes provided conservative flexural strength estimates, while sectional analysis per AFGC-2013, JSCE-2008, and KCI-2012 accurately predicted FGRC beam strength. The proposed numerical model showed a significant alignment with the test results of the simply supported UHPFRC-HSC beams.</div></div>\",\"PeriodicalId\":11677,\"journal\":{\"name\":\"Engineering Failure Analysis\",\"volume\":\"182 \",\"pages\":\"Article 110108\"},\"PeriodicalIF\":5.7000,\"publicationDate\":\"2025-09-09\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Engineering Failure Analysis\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1350630725008490\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, MECHANICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Engineering Failure Analysis","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1350630725008490","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
Experimental and numerical study on flexural behavior of functionally graded UHPFRC-HSC beams
The flexural behavior of Functionally Graded Reinforced Concrete (FGRC) beams using Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) with High-Strength Concrete (HSC) was investigated experimentally and numerically. Ten simply supported beams were subjected to four-point bending tests, with two varying ratios of longitudinal tensile reinforcement (ρl), to represent low and high ratios. The FGRC beams incorporate UHPFRC with a compressive strength of 157.2 MPa and HSC with 76.8 MPa. The UHPFRC layer was strategically placed in either the compression and tension zones or only in the compression zone of the beam. Experimental findings showed that FGRC beams demonstrated comparable ductility and strength to UHPFRC reference beams but at a much lower cost. FGRC beams with layers of UHPFRC on both the upper and lower layers, which make up 40 % of the total beam height, a beam with a high reinforcement ratio (ρl = 4.0 %) exhibited ductility of 261.6 % compared to HSC reference beam. It also carried 91.6 % of the flexural capacity of the pure UHPFRC beam. When the layers of UHPFRC accounted for 66.7 % of the beam’s height, the FGRC beams showed a notable increase in ductility, reaching 286.3 % compared to the HSC reference beam, and were able to carry 96.9 % of the load capacity of the UHPFRC beam. Raising ρl from 1.38 % to 4.0 % in the tested beams significantly improved flexural strength while maintaining good ductility. Design codes provided conservative flexural strength estimates, while sectional analysis per AFGC-2013, JSCE-2008, and KCI-2012 accurately predicted FGRC beam strength. The proposed numerical model showed a significant alignment with the test results of the simply supported UHPFRC-HSC beams.
期刊介绍:
Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies.
Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials.
Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged.
Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.