Periodica Polytechnica Civil Engineering最新文献_第5页

Developing Low Cost Eco-friendly Restoration Mortars for Historic Lime-based Stucco and Building Materials 为历史悠久的石灰基灰泥和建筑材料开发低成本环保型修复砂浆

Periodica Polytechnica Civil Engineering Pub Date : 2024-02-21 DOI: 10.3311/ppci.23440

Hussein H. Marey Mahmoud, Abdullah M. A. Kamel, Mona F. Ali

{"title":"Developing Low Cost Eco-friendly Restoration Mortars for Historic Lime-based Stucco and Building Materials","authors":"Hussein H. Marey Mahmoud, Abdullah M. A. Kamel, Mona F. Ali","doi":"10.3311/ppci.23440","DOIUrl":"https://doi.org/10.3311/ppci.23440","url":null,"abstract":"In this work, three formulations based on hydrated lime and eco-friendly additives of powdered brick, fly ash and silica fume were designed to improve repair mortars for historic lime-based stucco and building materials. The microscopic features, physical-mechanical behavior and the microstructure of the prepared mortars were evaluated before and after artificial ageing (by humidity/drying cycles and salt weathering). However, a significant mechanical enhancement was reported for the studied mixes, but the silica fume mix showed a notable failure after salt ageing. The fly ash mix revealed the highest bulk density ratio (1.172 g/cm3) compared to the lime and silica fume mixes. The silica fume mix recorded the lowest percentage of water absorption (35.56%) and apparent porosity (28.11%). Further, the silica fume mix yielded the highest dry compressive strength value (22.19 kg/cm2), with an increase reached 31% when compared to the standard lime mix. The results demonstrated that the fly ash mortar is more compatible for sustainable restoration procedures of historic lime-based structures in respect of the physical-mechanical properties.","PeriodicalId":512221,"journal":{"name":"Periodica Polytechnica Civil Engineering","volume":"163 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140443548","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

Experimental Study of Novel Demountable Shear Connectors for Steel-concrete Composite Buildings 用于钢-混凝土复合结构建筑的新型可拆卸剪力连接件的实验研究

Periodica Polytechnica Civil Engineering Pub Date : 2024-02-21 DOI: 10.3311/ppci.22732

Krisztián Király, László Dunai

{"title":"Experimental Study of Novel Demountable Shear Connectors for Steel-concrete Composite Buildings","authors":"Krisztián Király, László Dunai","doi":"10.3311/ppci.22732","DOIUrl":"https://doi.org/10.3311/ppci.22732","url":null,"abstract":"Sustainable composite structures in building construction are assembled using demountable structural elements that can be reused in the circular economy. The current research and development project, in cooperation with Budapest University of Technology and Economics and KÉSZ Group, bim.GROUP Ltd., Hungary, aims to design a novel demountable steel-concrete composite slab and frame system for buildings. The key component of this construction is the demountable shear connector. In the current research, novel bolted shear connectors with embedded bolts and threaded rods are developed and studied that can fit the applied technology of the industrial partner. One of the leading aspects of this connection is the consideration of bolt hole clearance, since it occurs initial slip and stiffness reduction of the composite beam. In the first phase of the research program, demountable and economical structural details were developed, which can reduce the stiffness reduction with the proper resistance and ductility features. To study the behavior of these shear connections, a push-out experimental program was designed and completed in March and April 2023. It is observed that novel shear connectors have a proper behavior with sufficient resistance and ductility, which is applicable according to the Eurocode 4 standard and fits the objectives of the research and development project. In the paper, the developed structural details and the push-out experimental program are presented with general results and statements besides a detailed evaluation of a specified specimen type.","PeriodicalId":512221,"journal":{"name":"Periodica Polytechnica Civil Engineering","volume":"6 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140445639","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

Investigating the Effect of GNP Addition on Self-healing of ECC through Mechanical and Nondestructive Testing 通过机械和无损检测研究添加 GNP 对 ECC 自愈合的影响

Periodica Polytechnica Civil Engineering Pub Date : 2024-02-20 DOI: 10.3311/ppci.22942

Aysu Göçügenci, S. B. Keskin

{"title":"Investigating the Effect of GNP Addition on Self-healing of ECC through Mechanical and Nondestructive Testing","authors":"Aysu Göçügenci, S. B. Keskin","doi":"10.3311/ppci.22942","DOIUrl":"https://doi.org/10.3311/ppci.22942","url":null,"abstract":"Inclusion of nanomaterials is an effective method for enhancing the mechanical and durability characteristics of cement-based materials. Among various graphene-based nanomaterials, graphene nanoplatelets (GNPs) are cost-effective nanoparticles that possess graphene's key properties. Since limited information is available regarding their influence on the fresh, mechanical, non-destructive, and self-healing behavior of Engineered Cementitious Composites (ECC), this research focuses on GNP inclusion on these properties of ECC in a comprehensive way. In this research, the changes in material properties of ECC were monitored with several mechanical and nondestructive test methods. According to the results, GNP inclusion significantly enhanced flexural behavior and also promoted self-healing of ECC, with preloaded specimens exhibiting substantial or complete crack closure and similar performance to virgin specimens. Non-destructive tests and microstructural analyses also confirmed the promoting effects of GNP. A noticeable increase was observed in compressive strength when GNP was included. In conclusion, this study provides compelling evidence about the positive impact of GNP inclusion on improving the properties of ECC. The findings demonstrate the potential of GNPs to enhance the performance of cementitious materials and offer valuable insights for future research and practical applications.","PeriodicalId":512221,"journal":{"name":"Periodica Polytechnica Civil Engineering","volume":"576 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140446843","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

The Effect of GSI and mi on the Stability of 3D Twin Tunnel in Limestone GSI 和 mi 对石灰岩三维双隧道稳定性的影响

Periodica Polytechnica Civil Engineering Pub Date : 2024-02-14 DOI: 10.3311/ppci.22239

J. Zenah, Péter Görög

引用次数: 0

The Effect of GSI and mi on the Stability of 3D Twin Tunnel in Limestone GSI 和 mi 对石灰岩三维双隧道稳定性的影响

Periodica Polytechnica Civil Engineering Pub Date : 2024-02-14 DOI: 10.3311/ppci.22239

J. Zenah, Péter Görög

引用次数: 0

Multi-objective Colliding Bodies Optimization Algorithm for the Obnoxious p-median Problems 厌恶 p 中值问题的多目标碰撞体优化算法

Periodica Polytechnica Civil Engineering Pub Date : 2024-02-12 DOI: 10.3311/ppci.23567

Ali Kaveh, V. Mahdavi

引用次数: 0

Multi-objective Colliding Bodies Optimization Algorithm for the Obnoxious p-median Problems 厌恶 p 中值问题的多目标碰撞体优化算法

Periodica Polytechnica Civil Engineering Pub Date : 2024-02-12 DOI: 10.3311/ppci.23567

Ali Kaveh, V. Mahdavi

引用次数: 0

Optimal Design of Shear Walls for Minimizing the Structural Torsion Using Cascade Optimization Algorithm 使用级联优化算法优化剪力墙设计以最小化结构扭转

Periodica Polytechnica Civil Engineering Pub Date : 2024-02-07 DOI: 10.3311/ppci.23460

H. Rahimi Bondarabadi, Ali Kaveh, Pariya Salimi

{"title":"Optimal Design of Shear Walls for Minimizing the Structural Torsion Using Cascade Optimization Algorithm","authors":"H. Rahimi Bondarabadi, Ali Kaveh, Pariya Salimi","doi":"10.3311/ppci.23460","DOIUrl":"https://doi.org/10.3311/ppci.23460","url":null,"abstract":"Due to a large number of design variables involved in the optimization of RC structures, a multi stage cascade optimization is used. This algorithm speeds up an accurate optimal design for the large-scale structures reducing the number of variables by dividing single optimization to a number of stages such that the optimization of each stage starts with the optimum results of the previous one. Here, the first stage of cascade optimization method uses the assembling of the stiffness matrix of the entire RC structure for minimizing the torsion of the stories as an objective function. By assembling the stiffness matrix of the RC frame without shear walls and the shear wall alone, the length and thickness of the shear wall on each story are taken as design variables of the first stage. The optimized reinforcement arrangement of walls according to the required wall rebar area is the goal of the next stage. Using this method, designing the RC structure and minimizing the structural torsion of each floor simultaneously, can result in different length and thickness for the shear walls in different stories. Reducing the structural torsion leads to economical structure. Here, the MATLAB and ETABS interfacing are utilized.","PeriodicalId":512221,"journal":{"name":"Periodica Polytechnica Civil Engineering","volume":"34 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139796957","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

Optimal Design of Shear Walls for Minimizing the Structural Torsion Using Cascade Optimization Algorithm 使用级联优化算法优化剪力墙设计以最小化结构扭转

Periodica Polytechnica Civil Engineering Pub Date : 2024-02-07 DOI: 10.3311/ppci.23460

H. Rahimi Bondarabadi, Ali Kaveh, Pariya Salimi

{"title":"Optimal Design of Shear Walls for Minimizing the Structural Torsion Using Cascade Optimization Algorithm","authors":"H. Rahimi Bondarabadi, Ali Kaveh, Pariya Salimi","doi":"10.3311/ppci.23460","DOIUrl":"https://doi.org/10.3311/ppci.23460","url":null,"abstract":"Due to a large number of design variables involved in the optimization of RC structures, a multi stage cascade optimization is used. This algorithm speeds up an accurate optimal design for the large-scale structures reducing the number of variables by dividing single optimization to a number of stages such that the optimization of each stage starts with the optimum results of the previous one. Here, the first stage of cascade optimization method uses the assembling of the stiffness matrix of the entire RC structure for minimizing the torsion of the stories as an objective function. By assembling the stiffness matrix of the RC frame without shear walls and the shear wall alone, the length and thickness of the shear wall on each story are taken as design variables of the first stage. The optimized reinforcement arrangement of walls according to the required wall rebar area is the goal of the next stage. Using this method, designing the RC structure and minimizing the structural torsion of each floor simultaneously, can result in different length and thickness for the shear walls in different stories. Reducing the structural torsion leads to economical structure. Here, the MATLAB and ETABS interfacing are utilized.","PeriodicalId":512221,"journal":{"name":"Periodica Polytechnica Civil Engineering","volume":"58 1-2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139857127","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

Cycle Bases of Graphs for the Analysis of Frames Structures Using Force Method 使用力法分析框架结构的图形周期基础

Periodica Polytechnica Civil Engineering Pub Date : 2024-01-30 DOI: 10.3311/ppci.23891

Ali Kaveh

引用次数: 0