Engineering Structures and Technologies最新文献_第5页

Ageing models and accelerated ageing tests of glass fiber reinforced concrete 玻璃纤维增强混凝土老化模型及加速老化试验

Engineering Structures and Technologies Pub Date : 2018-04-27 DOI: 10.3846/EST.2018.1467

R. Moceikis, A. Kičaitė, G. Skripkiūnas, A. Korjakins

引用次数: 6

Innovative solutions in construction industry. Review of 2016–2018 events and trends 建筑行业的创新解决方案。2016-2018年事件和趋势回顾

Engineering Structures and Technologies Pub Date : 2018-04-27 DOI: 10.3846/EST.2018.1469

O. Kapliński

引用次数: 29

Corrosion impact analysis on residual life of structure using cathodic technique and algor simulation software 利用阴极技术和algor仿真软件分析腐蚀对结构剩余寿命的影响

Engineering Structures and Technologies Pub Date : 2018-04-27 DOI: 10.3846/EST.2018.1468

C. Nayak, Nivedita Sunil Throat, S. Thakare

{"title":"Corrosion impact analysis on residual life of structure using cathodic technique and algor simulation software","authors":"C. Nayak, Nivedita Sunil Throat, S. Thakare","doi":"10.3846/EST.2018.1468","DOIUrl":"https://doi.org/10.3846/EST.2018.1468","url":null,"abstract":"Damage to the reinforced concrete structure is mainly occurring because of two reasons either due to end of service life or due to load exceeds beyond structural capacity. Along with these two reasons degradation of material property is the one more major factor which causes the risk of failure. A concrete structure constructed in an aqueous environment get exposed to the corrosion process. Consequently, this causes the generation of crack, fragilization, a decrease of bond strength between reinforcement and concrete. All these factors affection static and dynamic behavior of concrete structure reducing the service life of an affected area. Whereas service life carries the major role in the economy of a concrete structure that is why various methods have been developed in the second half of the 20th century to find out the residual life of the structure. In this proposed work, a non-destructive technique is used to predict the residual life of reinforced concrete beams having different cracking levels, as results of steel reinforcement corrosion, considering the variation produced in the dynamic behavior, through the variation of the first natural vibration frequency. Whereas to accelerate the corrosion process, impress current technique is used in which a current is externally applied to induce corrosion in reinforcement and then crack widths and vibration natural frequencies were measured. A numerical model is proposed with the help of FEM based Auto desk Algor simulation software to predict attack penetration depth. At the end, the paper is concluded by giving an effect of “water to cement ratio” and “cover to diameter ratio” on the initiation and propagation of corrosion and residual life of corroded beam specimen is graphically represented.","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44945140","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}

引用次数: 17

Experimental investigations and computer simulations to solve acoustic problems in the modern church 解决现代教堂声学问题的实验研究和计算机模拟

Engineering Structures and Technologies Pub Date : 2018-04-27 DOI: 10.3846/2029882X.2018.1445037

A. Sygulska, Tomasz Czerniak, Adrian Czarny-Kropiwnicki

引用次数: 0

DURABILITY OF A REPAIRED DUNE SAND MORTAR MODIFIED BY CERAMIC WASTE 陶瓷废料改性沙丘砂浆的耐久性

Engineering Structures and Technologies Pub Date : 2018-04-27 DOI: 10.3846/2029882X.2018.1445038

Y. Abadou, R. Kettab, A. Ghrieb

{"title":"DURABILITY OF A REPAIRED DUNE SAND MORTAR MODIFIED BY CERAMIC WASTE","authors":"Y. Abadou, R. Kettab, A. Ghrieb","doi":"10.3846/2029882X.2018.1445038","DOIUrl":"https://doi.org/10.3846/2029882X.2018.1445038","url":null,"abstract":"The waste-modified mortars have an important place in the range of repair products. The objective of this study is to better understand and analyze, in one hand, the influence of ceramic waste in the dune sand mortars on the quality of repair concrete surfaces, in the other hand, durability of the mortars in interaction with the substrates to which they are applied. As regards the mortar layer durability, two indicators are chosen: the first is the adhesion to the substrate, and the second is the stress state in the mortar layer. For this, two types of modified mortars were made using two types of waste ceramics: sanitary ceramics and earthenware. To evaluate the quality of the adhesion to a substrate surface to be repaired, an adhesion test based on the three point bending test was implemented, taking into account the influences of the environment, the state of the surface of the substrate, the nature of the substrate defined by its water saturation degree and its porosity. The mortar composition parameters, in particular, the nature and the amount of ceramic, were studied. The results enable us to evaluate the influences of the waste ceramic incorporation in the mortar and the substrate condition on which the mortar is applied. Show that the adhesion depends on both the type and the amount of the used ceramic waste and the applied cure. It is optimized from 30% of ceramic earthenware and sanitary mortar adhesive strengths are higher than mortars based on dune sand ones.","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46113502","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}

引用次数: 4

Numerical analysis of a double shear standard bolted connection considering monotonic loadings 考虑单调荷载的双剪标准螺栓连接的数值分析

Engineering Structures and Technologies Pub Date : 2017-12-21 DOI: 10.3846/2029882X.2017.1414638

M. Rodrigues, J. Correia, B. Pedrosa, A. Jesus, B. Carvalho, C. Rebelo, J. Xavier, R. Calçada

{"title":"Numerical analysis of a double shear standard bolted connection considering monotonic loadings","authors":"M. Rodrigues, J. Correia, B. Pedrosa, A. Jesus, B. Carvalho, C. Rebelo, J. Xavier, R. Calçada","doi":"10.3846/2029882X.2017.1414638","DOIUrl":"https://doi.org/10.3846/2029882X.2017.1414638","url":null,"abstract":"The behaviour of standard bolted steel connections submitted to monotonic loads, through the use of numerical models, is presented in the current paper. \u0000The bolted connections allow speed up constructive processes in an increasingly competitive and globalized world in which the costs are a decisive factor in the development of a project. The use of computational tools in the analysis of bolted connections becomes determinant, mainly for new solutions or solutions less explored in terms of design codes. \u0000Throughout the years, bolted connections have been suffering transformations resulting from research activities performed by many authors. Rivets have been replaced by bolts, the main achievement being the pre-stressed bolts. Methodologies based on finite element analyses were proposed for double shear bolted connection. The non-linear behaviour of these connections is investigated and their performances are compared. In the numerical modelling of the bolted connection, linear elastic and elastoplastic analyzes reveal that there are two slip levels associated with local non-linearities caused by the contact pairs, which vary with clamping stresses.","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3846/2029882X.2017.1414638","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44479163","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}

引用次数: 6

Fracture resistance analysis of PEEK-polymer PEEK聚合物的断裂抗力分析

Engineering Structures and Technologies Pub Date : 2017-12-21 DOI: 10.3846/2029882X.2017.1417062

G. Lesiuk, A. Sawicka, J. Correia, R. Frątczak

引用次数: 5

Structural and durability analysis of a novel re-roofing concept 一个新颖的屋顶改造概念的结构和耐久性分析

Engineering Structures and Technologies Pub Date : 2017-12-21 DOI: 10.3846/2029882X.2017.1404939

R. Richman, E. Bentz, Denver Jermyn, Chang Sun

{"title":"Structural and durability analysis of a novel re-roofing concept","authors":"R. Richman, E. Bentz, Denver Jermyn, Chang Sun","doi":"10.3846/2029882X.2017.1404939","DOIUrl":"https://doi.org/10.3846/2029882X.2017.1404939","url":null,"abstract":"Metal roof decks in long-span light steel structures can become damaged and obsolete by corrosion should the roofing system become compromised. Re-roofing is conducted by either removing and replacing damaged areas (resulting in suspension of interior operations and lost revenue) or installing new decking directly over the damaged areas which can transfer corrosion to the new deck. This research conducts structural and durability analyses on a novel proposed re-roofing concept that installs a new metal roof deck over the existing deck by using a proprietary deck strap resulting in no interruption of interior processes. Preliminary structural analysis shows the proposed concept to be applicable to generic conditions around Southern Ontario. Recommendations for project specific structural analysis are made. Durability analysis demonstrates that the proposed concept system improves hygrothermal performance of the roof assembly in all cases except when insulation in the existing roof assembly is saturated. Saturated insulation should be removed prior to installing the re-roofing system.","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3846/2029882X.2017.1404939","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48129853","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}

引用次数: 0

Effect of stress path, size and shape on the optimum parameters of a brittle-ductile concrete model 应力路径、尺寸和形状对脆性-延性混凝土模型最佳参数的影响

Engineering Structures and Technologies Pub Date : 2017-12-21 DOI: 10.3846/2029882X.2017.1414636

M. Labibzadeh, Reza Hamidi

{"title":"Effect of stress path, size and shape on the optimum parameters of a brittle-ductile concrete model","authors":"M. Labibzadeh, Reza Hamidi","doi":"10.3846/2029882X.2017.1414636","DOIUrl":"https://doi.org/10.3846/2029882X.2017.1414636","url":null,"abstract":"The main purpose of this study is to investigate the effects of the stress path, size and shape of the specimen, on the optimum values of the plastic input parameters of Concrete Damaged Plasticity-CDP- model of the ABAQUS software. This study concentrates on eccentricity, dilatation angle and viscosity input parameters. To finding optimum values of the mentioned parameters, an objective function which estimates the error of the model predictions was defined and tried to minimize. For evaluating the effect of the stress path on this optimization procedure, four different standard tests were simulated by the ABAQUS software: uniaxial compression, dual compression, dual-border cut specimen and three-point bending tests. For studying the effect of the size of the specimen, the three-point bending test, with three different sizes of the beam were modeled in the ABAQUS software. Furthermore, for investigating the effect of the specimen shape on the input parameters, a notched disk in a tensile stress field was modeled. Obtained results demonstrated that the path of the stress can influence significantly on the optimum values of the input parameters, while it was revealed that the CDP model can automatically take into account the size and shape effects in the simulation.","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3846/2029882X.2017.1414636","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46596837","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}

引用次数: 6

Mechanical characterization of ancient Portuguese riveted bridges steels 古葡萄牙铆接桥梁钢的力学特性

Engineering Structures and Technologies Pub Date : 2017-12-21 DOI: 10.3846/2029882X.2017.1414637

Patricia Raposo, J. Correia, G. Lesiuk, I. Valente, A. Jesus, R. Calçada

{"title":"Mechanical characterization of ancient Portuguese riveted bridges steels","authors":"Patricia Raposo, J. Correia, G. Lesiuk, I. Valente, A. Jesus, R. Calçada","doi":"10.3846/2029882X.2017.1414637","DOIUrl":"https://doi.org/10.3846/2029882X.2017.1414637","url":null,"abstract":"In repairing and retrofitting processes of ancient riveted steel bridges is crucial to assess the structural state of old metals to guaranty structural safety. Metals under long-time operations (mild, rimmed low carbon steels <0.1% C, puddle irons) and cyclic loading present a tendency for degradation processes. The case-studies of this work are five metallic bridges existing in Portugal (Luiz I, Eiffel, Fao, Pinhao and Trezoi). This work presents the study of some characteristics of materials extracted from the five case-studies, such as: monotonic tensile strength, chemical composition, microstructures, hardness, notch toughness and fatigue crack propagation. In terms of monotonic tensile tests, the materials from Luiz I, Eiffel and Fao bridges are similar to puddle steel and the materials from Pinhao and Trezoi bridges are similar to mild steel. In terms of toughness only the material from the Pinhao bridge exhibits acceptable toughness properties, considering current design requirements. The materials from the other bridges exhibit relatively low toughness properties. The fatigue crack propagation data from the old Portuguese riveted steel bridges were correlated using the Paris’s law and the possibility for a design crack growth rate was discussed.","PeriodicalId":11839,"journal":{"name":"Engineering Structures and Technologies","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3846/2029882X.2017.1414637","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43470129","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}

引用次数: 8