Cancan Yang, Ankit A. Bhargava, Mayur Bhuralal Purohit, Pinar Okumus
{"title":"Confinement Reinforcement for Under-Reinforced UHPC Beams under Flexure","authors":"Cancan Yang, Ankit A. Bhargava, Mayur Bhuralal Purohit, Pinar Okumus","doi":"10.21838/uhpc.9722","DOIUrl":"https://doi.org/10.21838/uhpc.9722","url":null,"abstract":"","PeriodicalId":170570,"journal":{"name":"Second International Interactive Symposium on UHPC","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124992457","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A highly detailed computational model is developed to simulate the behavior of twisted steel fiber pullout from ultra-high-performance concrete (UHPC). The model considers the effect of fiber-matrix interfacial behavior and material inelasticity. It is shown that the model is capable of reproducing key experimental observations including the ability of twisted fibers to exhibit pseudo-plastic behavior for slip values up to 80%-90% of a fiber’s embedded length. It is also shown that the maximum pullout decreases with increasing pitch and that fibers with triangular cross-section hae a somewhat larger ability to dissipate energy than fibers with other cross-sectional shapes.
{"title":"Twisted fiber pullout from UHPC: A computational study","authors":"Y. Tai, S. El-Tawil","doi":"10.21838/UHPC.9669","DOIUrl":"https://doi.org/10.21838/UHPC.9669","url":null,"abstract":"A highly detailed computational model is developed to simulate the behavior of twisted steel fiber pullout from ultra-high-performance concrete (UHPC). The model considers the effect of fiber-matrix interfacial behavior and material inelasticity. It is shown that the model is capable of reproducing key experimental observations including the ability of twisted fibers to exhibit pseudo-plastic behavior for slip values up to 80%-90% of a fiber’s embedded length. It is also shown that the maximum pullout decreases with increasing pitch and that fibers with triangular cross-section hae a somewhat larger ability to dissipate energy than fibers with other cross-sectional shapes.","PeriodicalId":170570,"journal":{"name":"Second International Interactive Symposium on UHPC","volume":"220 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132664756","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
: Accelerated bridge construction (ABC) reduces construction time and lane closures. As such, these projects are effective for construction and rehabilitation of bridges in areas of high traffic or limited access. Ultra-high performance concrete (UHPC) has increased the ability of designers and contractors to effectively and efficiently complete ABC projects. UHPC provides many advantages for ABC connections due to its high compressive and tensile strength, durability characteristics, and rheological properties. In recent years, the Federal Highway Administration has been conducting research on non-contact lap splice connections for prefabricated bridge elements using UHPC. The research presented in this paper focuses on one aspect of that research: bond between steel rebar and UHPC. The overarching goal of this research was to develop design guidance for UHPC-rebar lap splices. Experimental testing was conducted to quantify the influence of concrete cover, bar type, bar yield strength, and bar diameter on the UHPC-rebar bond strength. Sixty-seven direct tension pull-out tests were conducted to supplement data from previous research. Newly conducted pull-out tests focused on larger bar diameters, and included #8 (No. 25) and #11 (No. 36) bars. The results showed that larger diameter bars and epoxy coated bars have lower capacities than uncoated bars, smaller diameter bars.
{"title":"Effect of Steel Reinforcement Type and Diameter on the Strength of Non-Contact Lap Splice Connections using UHPC","authors":"K. McMullen, Z. Haber","doi":"10.21838/uhpc.9640","DOIUrl":"https://doi.org/10.21838/uhpc.9640","url":null,"abstract":": Accelerated bridge construction (ABC) reduces construction time and lane closures. As such, these projects are effective for construction and rehabilitation of bridges in areas of high traffic or limited access. Ultra-high performance concrete (UHPC) has increased the ability of designers and contractors to effectively and efficiently complete ABC projects. UHPC provides many advantages for ABC connections due to its high compressive and tensile strength, durability characteristics, and rheological properties. In recent years, the Federal Highway Administration has been conducting research on non-contact lap splice connections for prefabricated bridge elements using UHPC. The research presented in this paper focuses on one aspect of that research: bond between steel rebar and UHPC. The overarching goal of this research was to develop design guidance for UHPC-rebar lap splices. Experimental testing was conducted to quantify the influence of concrete cover, bar type, bar yield strength, and bar diameter on the UHPC-rebar bond strength. Sixty-seven direct tension pull-out tests were conducted to supplement data from previous research. Newly conducted pull-out tests focused on larger bar diameters, and included #8 (No. 25) and #11 (No. 36) bars. The results showed that larger diameter bars and epoxy coated bars have lower capacities than uncoated bars, smaller diameter bars.","PeriodicalId":170570,"journal":{"name":"Second International Interactive Symposium on UHPC","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131772320","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Núñez, José Patiño, Samuel Arango, Wilmar Echeverri
: Although ultra-high performance concrete (UHPC) is a relatively new material in Colombia, commercially available since approximately 2016, several interesting structural applications have been developed. Among them, two pedestrian bridges, the first is at the EAFIT University in the city of Medellín (2017) and the second at the National University in the city of Manizales (2018), building slab reinforcement for special equipment assembly (2017) and sections of ultra-thin pavement overlays (2017 and 2018). This paper gives an account of these applications, their designs, material and construction processes.
{"title":"Review of First Structural Applications of UHPC in Colombia","authors":"A. Núñez, José Patiño, Samuel Arango, Wilmar Echeverri","doi":"10.21838/uhpc.9701","DOIUrl":"https://doi.org/10.21838/uhpc.9701","url":null,"abstract":": Although ultra-high performance concrete (UHPC) is a relatively new material in Colombia, commercially available since approximately 2016, several interesting structural applications have been developed. Among them, two pedestrian bridges, the first is at the EAFIT University in the city of Medellín (2017) and the second at the National University in the city of Manizales (2018), building slab reinforcement for special equipment assembly (2017) and sections of ultra-thin pavement overlays (2017 and 2018). This paper gives an account of these applications, their designs, material and construction processes.","PeriodicalId":170570,"journal":{"name":"Second International Interactive Symposium on UHPC","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128401638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Shrinkage-Reduction of UHPC for Bridge Deck Overlays","authors":"L. Teng, K. Khayat","doi":"10.21838/uhpc.9738","DOIUrl":"https://doi.org/10.21838/uhpc.9738","url":null,"abstract":"","PeriodicalId":170570,"journal":{"name":"Second International Interactive Symposium on UHPC","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130101092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Raphaël Fabbri, Jenine Principe, Julien Derimay, Sebastian Bernardi
{"title":"Key Parameters for Building Reinforcement with an UHPFRC Overlay","authors":"Raphaël Fabbri, Jenine Principe, Julien Derimay, Sebastian Bernardi","doi":"10.21838/uhpc.9680","DOIUrl":"https://doi.org/10.21838/uhpc.9680","url":null,"abstract":"","PeriodicalId":170570,"journal":{"name":"Second International Interactive Symposium on UHPC","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124095895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Development of Non-Proprietary UHPC for Florida Precast Applications","authors":"J. Lawler, M. Tadros, M. Lampton, E. Wagner","doi":"10.21838/uhpc.9689","DOIUrl":"https://doi.org/10.21838/uhpc.9689","url":null,"abstract":"","PeriodicalId":170570,"journal":{"name":"Second International Interactive Symposium on UHPC","volume":"76 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120891383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. A. Miller, G. Loreto, N. Gao, K. Kurtis, L. Stewart
{"title":"Applications of UHPC to Bridge Construction in Georgia","authors":"A. A. Miller, G. Loreto, N. Gao, K. Kurtis, L. Stewart","doi":"10.21838/uhpc.9723","DOIUrl":"https://doi.org/10.21838/uhpc.9723","url":null,"abstract":"","PeriodicalId":170570,"journal":{"name":"Second International Interactive Symposium on UHPC","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130786455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
: The main objective of the research project reported in this paper is to develop a new type of high performance light beam that will increase the performance of usual beams (timber steel or RC beams) by combining FRP rebars cast in a ultra-high-performance concrete with short fibre reinforcement (UHPC-SFR). The beam is obtained to get a light beam with a high compressive and tensile capacity to sustain high bending moment and to be also shear resistant. The hybrid beam thus obtained possesses a lower bending stiffness than a glulam beam or steel beam of similar overall dimensions but a higher ultimate load capacity. One model is developed to validate this concept is presented in this paper. It is an analytical model based on the usual force equilibrium hypotheses. The load-displacement and moment-curvature relationships are compared to experimental results obtained from 5 large scales specimens. The results show good correlation between analytical and experimental results, and illustrate the potential interest of such composite beam configurations for civil engineering structures. Fatigue behaviour is also investigate UHPC and on 6 large scale beams.
{"title":"Experimental and Analytical Study of Fatigue Behaviour of Reinforced UHPC Beams","authors":"E. Ferrier, L. Michel","doi":"10.21838/uhpc.9692","DOIUrl":"https://doi.org/10.21838/uhpc.9692","url":null,"abstract":": The main objective of the research project reported in this paper is to develop a new type of high performance light beam that will increase the performance of usual beams (timber steel or RC beams) by combining FRP rebars cast in a ultra-high-performance concrete with short fibre reinforcement (UHPC-SFR). The beam is obtained to get a light beam with a high compressive and tensile capacity to sustain high bending moment and to be also shear resistant. The hybrid beam thus obtained possesses a lower bending stiffness than a glulam beam or steel beam of similar overall dimensions but a higher ultimate load capacity. One model is developed to validate this concept is presented in this paper. It is an analytical model based on the usual force equilibrium hypotheses. The load-displacement and moment-curvature relationships are compared to experimental results obtained from 5 large scales specimens. The results show good correlation between analytical and experimental results, and illustrate the potential interest of such composite beam configurations for civil engineering structures. Fatigue behaviour is also investigate UHPC and on 6 large scale beams.","PeriodicalId":170570,"journal":{"name":"Second International Interactive Symposium on UHPC","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131713895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：