Structural Concrete最新文献_第5页

Experimental investigation on the tension lap splices used in the joints of precast RC foundation piles 预制钢筋混凝土基桩接缝中使用的拉力搭接接头的实验研究

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-08-07 DOI: 10.1002/suco.202301058

Jukka Haavisto, Anssi Laaksonen

引用次数: 0

Investigation on the flexural behavior of high‐strength fiber‐reinforced concrete 高强度纤维增强混凝土抗弯行为研究

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-08-07 DOI: 10.1002/suco.202301031

Ricardo Laguardia Justen de Almeida, Guilherme Aris Parsekian, Marco Antonio Carnio

{"title":"Investigation on the flexural behavior of high‐strength fiber‐reinforced concrete","authors":"Ricardo Laguardia Justen de Almeida, Guilherme Aris Parsekian, Marco Antonio Carnio","doi":"10.1002/suco.202301031","DOIUrl":"https://doi.org/10.1002/suco.202301031","url":null,"abstract":"The present research investigated the flexural behavior of high‐strength fiber‐reinforced concrete (HSFRC) with six different types of fiber: hooked‐end and crimped steel fibers, chopped and pultruded glass fibers; monofilament and twisted polymeric fibers. An extensive experimental program with 108 specimens for 3‐point bending tests was carried out and the parameters analyzed were the fiber content (0.50%, 0.75% and 1.00% in volume), the fiber type and the compressive strength of the concrete (60 and 90 MPa). Statistical analyses were performed and showed that regardless of the fiber material, increasing the amount of fibers added to concrete increases residual strength and toughness. Limit of proportionality is not affected by the addition of fibers, while postcracking behavior, on the other hand, is controlled by the fibers. Increasing the compressive strength of the concrete matrix affect mainly the limit proportionality of all mixes and the postcracking behavior of the concrete reinforced with hooked‐end steel fibers. The classification of HSFRC and the conditions required for HSFRC for use in structural applications according to the fib Model Code 2010 were also discussed, and it was verified that such conditions are not consistent with the experimental results and should be revised for high‐strength fiber‐reinforced concrete.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"84 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930960","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

Investigation the behavior of LWAC encased steel columns after exposure to elevated temperature 研究 LWAC 包裹钢柱暴露于高温后的行为

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-08-07 DOI: 10.1002/suco.202400521

Noor Al‐Huda Al‐Talqani, Haitham Al‐Thairy

{"title":"Investigation the behavior of LWAC encased steel columns after exposure to elevated temperature","authors":"Noor Al‐Huda Al‐Talqani, Haitham Al‐Thairy","doi":"10.1002/suco.202400521","DOIUrl":"https://doi.org/10.1002/suco.202400521","url":null,"abstract":"This paper presents experimental and numerical investigations on the behavior of eccentrically loaded lightweight aggregate concrete encased steel (LWACES) columns after exposing to elevated temperatures. Sixteen concrete encased steel (CES) columns were considered in the study, 12 of which were exposed to elevated temperature then eccentrically loaded up to failure at different eccentricity ratios. The effect of temperature on the load–displacement relationships, failure load, and failure modes of the concrete encased steel (CES) columns was monitored and evaluated. Experimental results have shown that as the temperature increases, the load bearing capacity of the CES columns decreased. It has also been showed that, at high temperature, the normal‐weight concrete encased steel (NWCES) columns experienced larger degradation of the load bearing capacity compared to that of LWACES columns. Also, this study presents a numerical simulation of the behavior of LWACES columns at elevated temperatures with eccentric compressive load. The numerical model was implemented in conducting parametric study to understand the effect of temperature distribution, concrete cover, eccentricity ratio, and high temperature levels on the behavior of the thermally exposed (CES) columns. Numerical results have revealed that, at temperature value of 500°C, the ultimate capacity of LWACES with eccentricity ratios of 0.75, and 1 has decreased by 17%, and 23%, respectively, compared to that of the column with eccentricity ratio of 0.5.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"29 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930962","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

Dynamic response and blast resistance of I‐shaped steel‐concrete composite beam under explosive loading 爆炸荷载下 I 型钢-混凝土复合梁的动态响应和抗爆性能

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-08-05 DOI: 10.1002/suco.202400385

Yuan Li, Qutong Lin, Jianyu Liu

{"title":"Dynamic response and blast resistance of I‐shaped steel‐concrete composite beam under explosive loading","authors":"Yuan Li, Qutong Lin, Jianyu Liu","doi":"10.1002/suco.202400385","DOIUrl":"https://doi.org/10.1002/suco.202400385","url":null,"abstract":"To investigate the dynamic mechanical response and damage mechanisms of I‐shaped steel‐concrete composite beams under explosive loads, experimental research and numerical simulations were conducted on steel‐concrete composite structures. The accuracy of the numerical analysis model was validated by comparing the damage characteristics of the structures obtained from explosive tests on the steel‐concrete composite components. Based on this, numerical simulations were performed on steel‐concrete composite beams using the explicit dynamic analysis software ANSYS/LS‐DYNA, and a study on their damage mechanisms was conducted. This study resulted in the acquisition of dynamic mechanical response patterns, including time‐dependent stress, strain, displacement, acceleration, and so on. Different structural damage characteristics under various explosive conditions were summarized, and key parameters affecting the blast resistance of the structure were analyzed. The research findings indicated that, in contrast to the failure characteristics of I‐shaped reinforced concrete (RC) beams, the failure characteristics of I‐shaped steel‐concrete composite beams mainly include punching and shearing failure of the steel‐RC slab and local buckling of the steel beam. Under the same explosive conditions, steel‐concrete composite structures exhibit superior blast resistance, with certain changes in structural parameters significantly improving blast resistance. The research results can provide theoretical support and a scientific basis for the proactive design of blast protection in steel‐concrete beams.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"19 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141931086","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

Shear behavior of stud and SFCBs‐reinforced PBL composite connectors in steel‐concrete structures 钢-混凝土结构中螺栓和 SFCBs 加固 PBL 复合连接件的剪切行为

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-08-05 DOI: 10.1002/suco.202400267

Fangwen Wu, Bitong Zhao, Zhuo Liu, Zirun Li, Lanqing He, Zhou Fan

{"title":"Shear behavior of stud and SFCBs‐reinforced PBL composite connectors in steel‐concrete structures","authors":"Fangwen Wu, Bitong Zhao, Zhuo Liu, Zirun Li, Lanqing He, Zhou Fan","doi":"10.1002/suco.202400267","DOIUrl":"https://doi.org/10.1002/suco.202400267","url":null,"abstract":"In order to fully utilize the advantages of stud and perfobond leiste (PBL) connectors, a new composite shear connector was proposed in which the studs were welded to the H‐beam of the PBL shear connectors. In addition, to further improve the durability performance of the structure, steel‐fiber‐reinforced polymer composite bars (SFCBs) were used to replace steel rebars as penetrating rebars. In this study, the shear behaviors of SFCBs‐reinforced composite shear connectors were investigated by push‐out tests. The effects of the number of studs, the number of holes, and the type of penetrating rebars on the failure mode, load–slip curve, and shear behavior of the composite shear connectors were analyzed. The specimens' failure modes were mainly shearing the studs and crushing the concrete. Increasing the number of studs and holes has resulted in an increase of at least 7.47% in the shear resistance and 12.36% in the stiffness. SFCB had little effect on the shear resistance and reduced the stiffness but could improve ductility, with a maximum improvement of 11.49%. Additionally, a finite element model was established for parametric analysis. The results showed that the diameter of the SFCB and hole had a significant impact on the shear resistance. An equation for calculating the shear resistance based on the contributions of various components has been established that was applicable to composite shear connectors and has good accuracy and applicability.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"38 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141930963","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

Automatic assessment of the fatigue life of cables of cable‐stayed bridges by on‐line monitoring 通过在线监测自动评估斜拉桥缆索的疲劳寿命

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-08-02 DOI: 10.1002/suco.202400609

Bin Xu, Zirao Wu, Joan R. Casas, Danhui Dan

{"title":"Automatic assessment of the fatigue life of cables of cable‐stayed bridges by on‐line monitoring","authors":"Bin Xu, Zirao Wu, Joan R. Casas, Danhui Dan","doi":"10.1002/suco.202400609","DOIUrl":"https://doi.org/10.1002/suco.202400609","url":null,"abstract":"To accurately and timely evaluate the long‐term performance of cables in cable‐stayed bridges, an automatic perception technology scheme by on‐line monitoring of cable vibrations is proposed for the fatigue damage evaluation of in‐service cables. In the fatigue‐stress amplitude of cables, the stress produced by tension changes caused by external actions like traffic, wind, and temperature is the main component. When cables vibrate significantly, the stress caused by changes in cable vibration‐induced additional stress should not be neglected. Besides axial stress, bending stress is also significant in cable fatigue damage analysis. To make cable fatigue life prediction closer to real engineering scenarios, this factor should be considered. First, based on the cable dynamic stiffness theory, a method is proposed for the automatic gathering of the actual full‐stress time history of a cable by on‐line vibration monitoring. Furthermore, based on Miner's linear fatigue damage accumulation theory, an automatic fatigue life assessment method is proposed and applied to the vibration monitoring data of cables on an operational bridge. The results indicate that the proposed technology realizes automatic on‐line monitoring of cable forces and fatigue assessment of cables. Through statistical analysis of cable fatigue stress amplitude, it was determined that in cable‐stayed bridges, compared to long cables, short cables are more sensitive to external variable loads, typically experiencing larger and more frequent tension changes, and are more prone to fatigue. Therefore, short cables should be given more attention when analyzing cable fatigue in cable‐stayed bridges.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"80 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141882552","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

Experimental study on a novel reduced beem section self consolidating concrete‐filled double steel tube 新型减小贝姆截面自固结混凝土填充双钢管的实验研究

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-08-02 DOI: 10.1002/suco.202301030

Morteza Naghipour, Mohammad Akbarzadeh, Seyed Mohammad Reza Hasani

引用次数: 0

Accelerated external sulfate attack: Improved laboratory methods, considering physical and chemical processes 加速外部硫酸盐侵蚀：改进实验室方法，考虑物理和化学过程

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-08-01 DOI: 10.1002/suco.202400051

Arian Biook Aghazadeh, Sajjad Mirvalad

{"title":"Accelerated external sulfate attack: Improved laboratory methods, considering physical and chemical processes","authors":"Arian Biook Aghazadeh, Sajjad Mirvalad","doi":"10.1002/suco.202400051","DOIUrl":"https://doi.org/10.1002/suco.202400051","url":null,"abstract":"The most common and well‐known method for evaluating the sulfate resistance of cement blends is ASTM C1012 procedure. It takes at least 12–18 months to evaluate the results, considering this standard. The present research proposes two supplementary methods to accelerate the sulfate ions penetration into the mortar bars used in ASTM C1012. Both of these two supplementary methods were evaluated by studying mortar samples' expansion, mass change, visual condition, compressive strength, ultrasonic pulse velocity, and XRD. In the first method, a developed device provided an electrical conduction environment for mortar bars made of three cement blends. The results showed that this method produced between 8 and 16 times more expansion considering different studied cement blends. In the second method, mortar bars of seven cement blends were exposed to a devised prior condition under vacuum. Considering the results, this method produced between 2.5 and 9 times more expansion in relation to each cement blend and approach. Additionally, an excellent polynomial correlation was observed between the expansion of new accelerated methods and ASTM C1012 results. It can be concluded that using these accelerated methods as complementary to ASTM C1012 can help to evaluate the sulfate resistance of cement blends in a shorter time period.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"36 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141882489","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 high temperature on FRCM‐confined concrete 高温对 FRCM 混凝土的影响

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-08-01 DOI: 10.1002/suco.202301022

Klajdi Toska, Flora Faleschini, Anne‐Lise Beaucour, Carlo Pellegrino, Albert Noumowe

引用次数: 0

Effect of high‐range water reducer and W/C ratio on the fresh and mechanical properties of fiber‐reinforced natural zeolite SCC 高范围减水剂和 W/C 比对纤维增强天然沸石 SCC 的新鲜度和力学性能的影响

IF 3.2 3区工程技术

Structural Concrete Pub Date : 2024-08-01 DOI: 10.1002/suco.202301071

Arash K. Pour, Amir Shirkhani, Ehsan Noroozinejad Farsangi

{"title":"Effect of high‐range water reducer and W/C ratio on the fresh and mechanical properties of fiber‐reinforced natural zeolite SCC","authors":"Arash K. Pour, Amir Shirkhani, Ehsan Noroozinejad Farsangi","doi":"10.1002/suco.202301071","DOIUrl":"https://doi.org/10.1002/suco.202301071","url":null,"abstract":"The present study aims to investigate how the use of high‐range water reducer (HRWR) and variations in water/cement (W/C) ratio affect the properties of self‐consolidating concrete (SCC) while taking into account different proportions of polypropylene fibers (PF) and natural zeolite (NZ). A total of 28 samples were cast and analyzed. PF fractions ranging from 0% to 1.5% by weight were added, along with a substitution of 10% NZ for cement (50 kg/m3). Four W/C ratios (0.30, 0.35, 0.40, and 0.45) were tested, in addition to seven HRWR contents ranging from 5 to 6.5 kg/m3. Various tests were conducted to assess slump, T500, V‐funnel, L‐box, modulus of elasticity, and compressive, tensile, and flexural strengths. Novel models were developed to predict the properties of hardened concrete based on W/C, HRWR, PF, and NZ content. Findings indicated that optimal performance of PF‐reinforced SCC with NZ was achieved when up to 0.75% PF was combined with an HRWR content equivalent to 1.25% of the cement fraction and NZ ratio. Furthermore, the proposed models offer accurate predictions of both fresh and hardened‐state properties of PF‐reinforced SCC with NZ based on W/C and HRWR ratios.","PeriodicalId":21988,"journal":{"name":"Structural Concrete","volume":"1 1","pages":""},"PeriodicalIF":3.2,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141882555","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