Sustainable Structures最新文献_第2页

Structural response of high strength concrete beams using fiber reinforced polymers under reversed cyclic loading 反循环荷载作用下纤维增强聚合物高强混凝土梁的结构响应

Sustainable Structures Pub Date : 2022-06-01 DOI: 10.54113/j.sust.2022.000018

Adam Guo

{"title":"Structural response of high strength concrete beams using fiber reinforced polymers under reversed cyclic loading","authors":"Adam Guo","doi":"10.54113/j.sust.2022.000018","DOIUrl":"https://doi.org/10.54113/j.sust.2022.000018","url":null,"abstract":"This paper investigates the response of high strength concrete (HSC) beams subjected to reversed cyclic loading using carbon fiber-reinforced polymer (CFRP), glass fiber-reinforced polymers (GFRP), and hybrid FRP/steel bars as bottom tensile reinforcement. Five HSC beams with a rectangular cross-section were prepared and poured using with a 28-day concrete compressive strength of 60 MPa (8.7 ksi). A displacement-controlled reversed cyclic loading has been applied to all the beams. The test setup has been designed to represent seismic effect on structures. Flexural capacity, concrete and reinforcement steel strains, cracking behavior, and ductility results were obtained. The hybrid steel/FRP has shown an improved performance in terms of flexural capacity, strains, and ductility. While the inclusion of FRP grids reduces the flexural capacity, this can be improved by adding more layers of FRP. Overall, the nominal moment of the hybrid sections were the highest between all beams. The ACI 318 code’s empirical equations showed close results in terms of the tensile strength of the FRP. The ACI 440R has shown overestimated nominal moment values compared to the experimental results.","PeriodicalId":138723,"journal":{"name":"Sustainable Structures","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131738501","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

Influence of stacking sequence on mechanical properties and moisture absorption of epoxy-based woven flax and basalt fabric hybrid composites 叠层顺序对环氧基梭织亚麻-玄武岩混杂复合材料力学性能和吸湿性能的影响

Sustainable Structures Pub Date : 2022-06-01 DOI: 10.54113/j.sust.2022.000016

Adam Guo

{"title":"Influence of stacking sequence on mechanical properties and moisture absorption of epoxy-based woven flax and basalt fabric hybrid composites","authors":"Adam Guo","doi":"10.54113/j.sust.2022.000016","DOIUrl":"https://doi.org/10.54113/j.sust.2022.000016","url":null,"abstract":"Hybrid composite laminates (HCL) were prepared by lay-up molding using a hot-press bed for reinforcing epoxy-based woven flax and basalt fabric composites. Mechanical properties and moisture absorption of HCL were measured, and the fracture surface was examined by scanning electron microscopy (SEM). The present results indicated that the mechanical properties of HCL are strongly dependent on the sequence of fiber reinforcement. HCL (S2, S3, S4, S5) with symmetric stacking sequences that increase with basalt fibers (wt %) showed a positive hybridization effect on mechanical properties and curve characteristics. However, the mechanical properties of S7 (asymmetric stacking) were lower than S3, S4, S5 (symmetric stacking), which indicated that symmetric stacking sequences of HCL had superior mechanical performance compared with the cross arrangement of HCL. The moisture absorption of HCL samples immersed in water at 26 °C showed the Fickian behaviour up to 42 days and were not affected by altering the stacking sequence on HCL. The SEM of the fracture surface, fiber-matrix bonding, and interfacial bonding of flax-basalt fabric HCL were also presented.","PeriodicalId":138723,"journal":{"name":"Sustainable Structures","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126990706","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: 2

Analysis of the mass and deformation variation rates over time and their influence on long-term durability for specimens of porous material 多孔材料试样质量和变形随时间的变化率及其对长期耐久性的影响分析

Sustainable Structures Pub Date : 2022-05-01 DOI: 10.54113/j.sust.2022.000014

Adam Guo

{"title":"Analysis of the mass and deformation variation rates over time and their influence on long-term durability for specimens of porous material","authors":"Adam Guo","doi":"10.54113/j.sust.2022.000014","DOIUrl":"https://doi.org/10.54113/j.sust.2022.000014","url":null,"abstract":"In an environment subjected to continuous climatic evolution, the study of the long-term behavior of building materials subject to environmental aggressions becomes an extremely important factor in evaluating the sustainability of these materials over time. The damage due to the aggression of external agents does not only affect the surface of the building but can cause a loss of performance in the mechanical qualities of the material with the worsening of the safety conditions of the entire structure. The velocity of the damage evolution is an interesting item. Here the variation velocity of some parameters characterizing the porous materials subjected to aggressive actions is dealt with. Starting from standard material characterization tests, extending the test times, the rate of variation of the mass and the deformation induced by the absorption of saline solutions in the porous medium and the variation of these speeds over time were evaluated. Hypotheses are formulated on the influence that this speed on the degradation of the material in the short and long time. The results obtained show how long-term aggressive action can cause internal damage with a consequent critical increase in absorption, mass and deformation, phenomena that can induce even severe damage to structural elements.","PeriodicalId":138723,"journal":{"name":"Sustainable Structures","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131514924","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: 3

Mechanical properties of timber-concrete connections with steel tube connectors 带钢管接头的木-混凝土连接的力学性能

Sustainable Structures Pub Date : 2022-05-01 DOI: 10.54113/j.sust.2022.000017

Adam Guo

引用次数: 8

A review of tiny houses in North America: Market demand 北美微型住宅综述:市场需求

Sustainable Structures Pub Date : 2022-04-01 DOI: 10.54113/j.sust.2022.000012

Adam Guo

引用次数: 8

An innovative digital workflow to design, build and manage bamboo structures 一个创新的数字工作流程来设计、建造和管理竹结构

Sustainable Structures Pub Date : 2022-03-01 DOI: 10.54113/j.sust.2022.000011

Adam Guo

{"title":"An innovative digital workflow to design, build and manage bamboo structures","authors":"Adam Guo","doi":"10.54113/j.sust.2022.000011","DOIUrl":"https://doi.org/10.54113/j.sust.2022.000011","url":null,"abstract":"At current rates, the building industry is the major contributor to gas emissions and energy consumption in the world, placing unprecedented pressure to find alternative and sustainable construction materials, particularly in regions where urbanization and population growth are expected to rise. Coincidentally, bamboo culms are a sustainable and abundant resource with the potential to be used as a structural element in those regions, however, their organic nature and inherent incompatibility with modern design and construction procedures have hampered their formal utilization. This article presents the details of an innovative workflow based on the philosophy that the quality and reliability of bamboo structures can be computationally managed through the digitization of individual structural bamboo elements. The workflow relies on reverse-engineering processes that integrate and make bamboo culms compatible with modern data-management platforms such as Building Information Modelling. A case study based on a reconstruction project of bamboo houses in Lombok, Indonesia is presented to illustrate the proposed workflow. This work showed that digitization and management are not just to represent shapes and information regarding bamboo culms through computer software, but can also control the quality, sustainability, and structural behavior of a bamboo structure during its entire service life.","PeriodicalId":138723,"journal":{"name":"Sustainable Structures","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121124635","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: 25

“Bamboo: A Very Sustainable Construction Material” - 2021 International Online Seminar summary report “竹子:一种非常可持续的建筑材料”- 2021国际在线研讨会总结报告

Sustainable Structures Pub Date : 2022-03-01 DOI: 10.54113/j.sust.2022.000015

Adam Guo

引用次数: 24

Parametric design of developable structure based on yoshimura origami pattern 基于吉村折纸图案的可展开结构参数化设计

Sustainable Structures Pub Date : 2022-03-01 DOI: 10.54113/j.sust.2022.000019

Adam Guo

{"title":"Parametric design of developable structure based on yoshimura origami pattern","authors":"Adam Guo","doi":"10.54113/j.sust.2022.000019","DOIUrl":"https://doi.org/10.54113/j.sust.2022.000019","url":null,"abstract":"Origami is an ancient art form and can be divided into rigid and non-rigid origami. Rigid origami is suitable for the design of building structures because the panels are not twisted and deformed during the folding process. Currently, rigid origami structures are generally built with steel. However, compared with natural, non-polluting wood, steel has a high energy consumption and a high environmental impact. Based on this situation, this paper designs a developable wooden building structure using the Yoshimura origami model. First, the Jacobian matrix method was used to analyze the degree of freedom of the basic unit of the Yoshimura origami pattern, following which the motion trajectory required by the target structure was obtained. Secondly, by analyzing the relationship between the plane angle α and dihedral angle θ, three interaction rules were obtained, and the formula for determining the structure size was established by using the plane angle α, dihedral angle θ, the number of valley folds n and the unit length l. Subsequently, two enhancement schemes, the quadrangle enhancement scheme and the triangle enhancement scheme, were proposed to increase the height of the structure. After comparing the deformation and failure types of origami structures based on Cross-Laminated Timber, a triangular reinforcement scheme was chosen to increase the height of the structure. Finally, a new connection method was developed that allowed the origami structure to be practically applied. This research demonstrates the possibility of developing a timber structure based on Yoshimura origami.","PeriodicalId":138723,"journal":{"name":"Sustainable Structures","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115492139","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: 5

Semi-rigid behaviour of stainless steel beam-to-column bolted connections 不锈钢梁-柱螺栓连接的半刚性性能

Sustainable Structures Pub Date : 2021-08-01 DOI: 10.54113/j.sust.2021.000002

M. Ashraf, Mohammad Jobaer Hasan, S. Al-Deen

{"title":"Semi-rigid behaviour of stainless steel beam-to-column bolted connections","authors":"M. Ashraf, Mohammad Jobaer Hasan, S. Al-Deen","doi":"10.54113/j.sust.2021.000002","DOIUrl":"https://doi.org/10.54113/j.sust.2021.000002","url":null,"abstract":"Stainless steel is increasingly used in structural applications but there is still significant lack of experimental evidence on the moment-rotation (M-) behaviour of moment resisting beam-to-column connections. The current paper presents experimental test results obtained from full scale tests conducted on three widely used connection types i.e., double web angle (DWA), top seat angle (TSA) and top seat with double web angle (TS-DWA) connection. Considered beam, column and angle sections were fabricated using austenitic stainless steel plates and M20 high strength bolts were used for connection assembly. M- curves for all connections were carefully recorded and were used to determine initial stiffness (Ki) and moment capacity (M20mrad) for each of the connections. Eurocode 3 guidelines were used to check the classification i.e., whether or not the connections were semi-rigid in nature. Although the considered DWA connection failed to achieve partial-strength, both TSA and TS-DWA connections showed obvious semi-rigid nature despite the connection capacities were limited by bolts. In addition, extensive ductility of stainless steel ensured that all three connection types achieved a minimum connection rotation of 30 mrad, which is specified by FEMA as a requirement for earthquake design of ordinary moment frames.","PeriodicalId":138723,"journal":{"name":"Sustainable Structures","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134478024","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: 14

Research on dynamic characteristics test of wooden floor structure for gymnasium 体育馆木地板结构动力特性试验研究

Sustainable Structures Pub Date : 2021-08-01 DOI: 10.54113/j.sust.2021.000005

Adam Guo

{"title":"Research on dynamic characteristics test of wooden floor structure for gymnasium","authors":"Adam Guo","doi":"10.54113/j.sust.2021.000005","DOIUrl":"https://doi.org/10.54113/j.sust.2021.000005","url":null,"abstract":"In order to better evaluate the structural performance of the wooden floor used in the gymnasium and realize the structural optimization design, this research considered two gymnasium’s floors in Nanjing as the research object and used the transient excitation method to test the natural frequency and damping ratio parameters of the three types of floor structures. The results showed that three kinds of floor structures all meet the requirements of building comfort; under the premise that the types and specifications of the constituent materials were the same, the order of the damping ratios of the three kinds of floor structures from large to small was: the fixed floor structure with double-layer load distribution strip, the suspended floor structure with single-layer load distribution strip, and the suspended floor structure with double-layer load distribution strip; compared with the fixed floor structure, the suspended floor structure had low damping ratio characteristics, the energy dissipation was slow during structural vibration, which means its impact absorption rate was small, and its impact buffering ability was good. The integral structure had good resilience performance; compared with the floor structure using single-layer load distribution strip. The floor structure using a double-layer load distribution strip had a low damping ratio characteristic. The absorption rate of the structure was small and the resilience performance was good. The research conclusion had certain engineering application value.","PeriodicalId":138723,"journal":{"name":"Sustainable Structures","volume":"154 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116778735","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: 30