Structural Concrete最新文献_第2页

Performance of eccentrically loaded low‐strength RC columns confined with posttensioned metal straps: An experimental and numerical investigation 用后张金属带约束的偏心加载低强度 RC 柱的性能：实验和数值研究

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-09-03 DOI: 10.1002/suco.202301026

Ram Prasad Neupane, Thanongsak Imjai, Reyes Garcia, Yie Sue Chua, Sandeep Chaudhary

{"title":"Performance of eccentrically loaded low‐strength RC columns confined with posttensioned metal straps: An experimental and numerical investigation","authors":"Ram Prasad Neupane, Thanongsak Imjai, Reyes Garcia, Yie Sue Chua, Sandeep Chaudhary","doi":"10.1002/suco.202301026","DOIUrl":"https://doi.org/10.1002/suco.202301026","url":null,"abstract":"This study experimentally and numerically examines the performance of low‐strength reinforced concrete (LS RC) columns confined with external post‐tensioned metal straps (PTMS). Twelve square columns of cross‐section 125 × 125 mm and height 1500 mm were subjected to axial load, with eight columns being eccentrically loaded. Four columns were control specimens without confinement, and another eight were confined using a novel technique that provides active confinement through the PTMS. The main parameters investigated included the PTMS confinement ratio (ρv = 0.64% and 1.28%) and different eccentricities (e/b = 0, 0.25, 0.5 or 1.0, where e = eccentricity). The results show that the capacity and axial displacement of the PTMS‐confined columns increased by up to 43% and 116% over unconfined control columns. Finite element analyses of the columns were carried out in Abaqus® to provide further insight into the behavior of PTMS‐confined columns. This study contributes towards developing cost‐effective confinement solutions for LS RC columns, thus encouraging the broader adoption of active confinement techniques in practical strengthening applications.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"15 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142203987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Damage assessment of self‐centering rocking piers using an input energy‐based damage prediction model coupled with self‐centering index 使用基于输入能量的损伤预测模型和自定心指数对自定心摇动墩进行损伤评估

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-09-02 DOI: 10.1002/suco.202301146

Rezvan Ashouri, Mahmoud R. Shiravand

{"title":"Damage assessment of self‐centering rocking piers using an input energy‐based damage prediction model coupled with self‐centering index","authors":"Rezvan Ashouri, Mahmoud R. Shiravand","doi":"10.1002/suco.202301146","DOIUrl":"https://doi.org/10.1002/suco.202301146","url":null,"abstract":"The immediate functionality of bridges following severe earthquakes is vital for uninterrupted rescue operations. Regarding the significance of resiliency in bridges, post‐tensioned (PT) rocking piers with low residual displacements and minimal damages have developed over the past few decades. The rocking mechanism at two ends of the pier avoids bending moments and excessive flexural damage. The self‐centering (SC) capacity in this system is provided through post‐tensioning forces. Concerning optimum seismic design and retrofit purposes, it is essential to predict the actual degree of seismic damage and SC capacity of PT rocking systems after seismic hazards. In this case, a self‐centering index (SI) is proposed to evaluate the SC capacity when piers are subjected to cyclic and seismic loadings. This SI, when used in co‐operation with a viable damage prediction model, predicts whether or not the piers remain reparable under cyclic or seismic loading scenarios. After comparing a number of energy‐based damage indices, all of which consider the cumulative hysteresis energy, with the input energy‐based damage index (IEB‐DI), the latter was calibrated against observed damages under cyclic loading tests. This DI was chosen as the most suitable damage prediction model and was considered to be simply applicable after time history analysis. In this study, the seismic performance of a seismic‐resistant dual system, consisting of three RC bents along with an SC bent, was evaluated using the aforementioned damage limit states and the introduced SI. The damage predictions of the monolithic bridge, as the reference model, were compared with the estimated damage to the dual bridge. The results show that the joint application of the IEB‐DI and the proposed SI in predicting the performance level of SC rocking piers results in a comprehensive damage prediction model.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"13 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mesoscale modeling of recycled aggregate concrete: A parametric analysis of the quality and shape of aggregate 再生骨料混凝土的中尺度建模：骨料质量和形状参数分析

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-09-02 DOI: 10.1002/suco.202400743

Qifan Ren, João Pacheco, Jorge de Brito

{"title":"Mesoscale modeling of recycled aggregate concrete: A parametric analysis of the quality and shape of aggregate","authors":"Qifan Ren, João Pacheco, Jorge de Brito","doi":"10.1002/suco.202400743","DOIUrl":"https://doi.org/10.1002/suco.202400743","url":null,"abstract":"Recycled aggregate concrete (RAC) is a multi‐phase material, and it is meaningful to investigate the effect of the properties of each phase. However, a comprehensive parametric analysis of these properties is still lacking, which limits a full understanding of the behavior of RAC. This paper uses numerical mesoscale models and contributes to knowledge on this topic. It focuses on the effects of the quality and shape of aggregate since they are relevant to the behavior of concrete but have scarcely been studied for RAC. Their effects on the mechanical response and fracture behavior of RAC were analyzed based on a validated two‐dimensional numerical model. In addition, this paper also justified the choice of the range of the parameters as well as benchmarked the numerical results with the state‐of‐the‐art. The main findings of the paper are: (1) stiffer aggregates decrease the tensile (by up to 29%) and compressive strength of RAC (by up to 7%); (2) aggregate shape moderately influences these properties by up to 10% and 8%; (3) the modulus of elasticity of RAC is considerably influenced by the stiffness of the aggregates (15%), while it is almost unaffected by the shape of the aggregates; (4) both stiffer and elongated aggregates tend to cause micro‐cracking in the interface and premature failure of concrete.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"40 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142203988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Reinforced concrete structures under hard projectile impact: penetration and perforation resistance 硬质弹丸冲击下的钢筋混凝土结构：抗穿透性和抗穿孔性

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-09-02 DOI: 10.1002/suco.202300143

Pascal Distler, Lars Heibges, Hamid Sadegh‐Azar

{"title":"Reinforced concrete structures under hard projectile impact: penetration and perforation resistance","authors":"Pascal Distler, Lars Heibges, Hamid Sadegh‐Azar","doi":"10.1002/suco.202300143","DOIUrl":"https://doi.org/10.1002/suco.202300143","url":null,"abstract":"Reinforced concrete (RC) structures are mainly designed to withstand both static and dynamic loads. However, due to the highly nonlinear behavior of RC structures subjected to extreme dynamic loads, these structures have a very complex damage behavior under dynamic impact loading. In fact, current existing methods for damage‐simulation and prediction are generally based on either empirical data, simplified mechanical approaches or complex numerical simulations mainly using the finite element method. In this regard, empirical and semi‐empirical models can be considered to calculate the load‐bearing capacity in a simplified way with only a few input parameters. Hence, using current experimental test data, this paper aims to analyze and assess existing empirical and semi‐analytical approaches that are established in standards and guidelines. Accordingly, a functional relationship in terms of an impact factor is found. Based on the obtained results, different approaches are also developed to describe the resistance to projectile penetration of RC structures as well as the force interaction between projectile and RC structures.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"59 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142203989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of using normal concrete or recycled concrete layer on behavior of repaired projectile bullet damaged reinforced concrete beams 使用普通混凝土或再生混凝土层对受损钢筋混凝土梁的修复行为的影响

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-09-02 DOI: 10.1002/suco.202301054

Ala’ Taleb Obaidat

{"title":"Effect of using normal concrete or recycled concrete layer on behavior of repaired projectile bullet damaged reinforced concrete beams","authors":"Ala’ Taleb Obaidat","doi":"10.1002/suco.202301054","DOIUrl":"https://doi.org/10.1002/suco.202301054","url":null,"abstract":"This study utilized experimental research to investigate the efficiency of using normal aggregate concrete (NAC) or recycled aggregate concrete (RAC) as a new concrete layer for repairing projectile bullet damage to strengthening reinforced concrete (RC) beams. This study comprised the construction and testing of eight RC beams made of RAC and NAC. They are initially subjected to projectile bullets and after that tested with flexure load to evaluate the effect of using RAC and NAC that was investigated. The findings of test results demonstrate that the repaired specimens with RAC or NAC experienced a higher load capacity than the damaged control specimens. As such, this approach could potentially use to restore RAC or NAC beams were previously damaged by projectile bullets. In addition, the findings of this research indicate that the load capacity of the damaged RC beams that were previously repaired using the NAC layer was higher than the load capacity of the damaged RC beams that were repaired using the RAC layer. The load capacity enhanced significantly of (106%–118%) and (104%–113%), respectively, when NAC and RAC are utilized in repairs. Therefore, using either NAC or RAC concrete is more economical, environmentally friendly, and efficient than demolishing.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"70 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142203990","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quantifying the serviceability flexural benefits of using UHPFRC in profiled slabs 量化在异型板中使用超高分子量泡沫塑料混凝土的适用性抗弯优势

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-08-30 DOI: 10.1002/suco.202300389

S. Chen, P. Visintin, A. B. Sturm, D. J. Oehlers

引用次数: 0

Nonlinear global design resistance: Case studies of post‐tensioned concrete bridges made of I‐73 and KA‐61 girders 非线性总体设计阻力：由 I-73 和 KA-61 梁组成的后张法混凝土桥梁案例研究

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-08-29 DOI: 10.1002/suco.202300986

Martin Lipowczan, Lukáš Novák, David Lehký, Drahomír Novák

{"title":"Nonlinear global design resistance: Case studies of post‐tensioned concrete bridges made of I‐73 and KA‐61 girders","authors":"Martin Lipowczan, Lukáš Novák, David Lehký, Drahomír Novák","doi":"10.1002/suco.202300986","DOIUrl":"https://doi.org/10.1002/suco.202300986","url":null,"abstract":"The paper portrays a comprehensive computational procedure for determining the global structural resistances of two existing bridges made of I‐73 and KA‐61 precast post‐tensioned concrete girders using advanced statistical assessment methods in combination with nonlinear fracture mechanics‐based finite element method analysis. Although this combination is a powerful tool for realistic modeling of structures, its practical application is still very time consuming. Therefore, a statistical sampling approach for the determination of the structural design resistance is compared to selected efficient semi‐probabilistic methods based on the estimation of coefficient of variation—estimation of coefficient of variation (ECoV) method according to fib Model Code 2010 and improved approach called Eigen ECoV method. Load‐bearing capacity is determined for the ultimate as well as several serviceability limit states. The sensitivity of the input parameters burdened with uncertainties on the response of the structure is quantified using a sensitivity analysis supported by a surrogate model based on polynomial chaos expansion. The paper shows that the applicability of nonlinear modeling with respect to uncertainties is possible when using these ECoV methods and a surrogate model and can be applied in a routine manner. The shortcomings and advantages of all the used safety design/assessment methods are discussed.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"14 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142203993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Early use of the reinforced concrete in the architecture of the Historicism in Austria–Hungary 奥匈帝国历史主义建筑中钢筋混凝土的早期应用

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-08-29 DOI: 10.1002/suco.202400160

Éva Lovra, Zoltán Bereczki

引用次数: 0

Anchorage capacity of bent looped wire ropes in precast concrete wall elements for T‐ and L‐ connections 预制混凝土墙体构件中 T 型和 L 型连接弯环钢丝绳的锚固能力

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-08-29 DOI: 10.1002/suco.202400107

Torkil Veyhe, Henrik Brøner Jørgensen, Søren Gustenhoff Hansen

引用次数: 0

Flexural behavior of corroded RC beams repaired with high performance cementitious mortar under cyclic loading 循环荷载下用高性能水泥基砂浆修复的受腐蚀钢筋混凝土梁的挠曲行为

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-08-28 DOI: 10.1002/suco.202400375

Antonio Mudadu, Andrea Prota, Costantino Menna

{"title":"Flexural behavior of corroded RC beams repaired with high performance cementitious mortar under cyclic loading","authors":"Antonio Mudadu, Andrea Prota, Costantino Menna","doi":"10.1002/suco.202400375","DOIUrl":"https://doi.org/10.1002/suco.202400375","url":null,"abstract":"The understanding of the cyclic performance of reinforced concrete (RC) elements is of vital importance in relation to the extent of the service life of buildings and infrastructures. Steel rebar corrosion plays a major role in this regard because it significantly affects the overall structural integrity, especially under cyclic loads, leading to reduced stiffness and load‐bearing capacity of structural elements. Cyclic condition has the potential to accelerate the corrosion‐induced cracking and spalling, the effectiveness of the bond strength between rebar and concrete, and also the ductility and energy dissipation characteristics of the structure. The primary objective of this study is to investigate the effectiveness of a high‐performance thixotropic repairing cementitious mortar in improving the fatigue behavior of RC elements through a multiscale experimental approach. First, at the material scale of concrete specimens, two different concrete classes together with the repairing one‐component, pre‐blended, thixotropic cementitious mortar, were tested under incremental cyclic condition. Based on the results obtained from material scale, four reinforced concrete beams were exposed to different levels of accelerated corrosion by means of the impressed current technique and, subsequently, repaired by bonding a layer of the thixotropic high‐performance mortar onto the tension side. Finally, beams were tested under incremental cyclic four‐point bending test to investigate the fatigue behavior in terms of crack onset, propagation and energy dissipation. The resulting cyclic properties and cracking behavior of the structural elements were related to the level of corrosion achieved through the accelerated test and the effectiveness of the structural repair mortar was proven. In terms of code compliance, the repairing mortar was able to fulfill the requirements of frequent and quasi‐permanent combination of loads, remaining below all the threshold values provided by the Italian NTC2018 and Eurocode.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"143 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142203995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0