Australian Journal of Structural Engineering最新文献

{"title":"Regression models for ultimate hogging moment prediction of composite cellular beams","authors":"Vinicius Moura de Oliveira, Lucas Mognon Santiago Prates, A. Christoforo, C. H. Martins, A. Rossi, Felipe Piana Vendramell Ferreira","doi":"10.1080/13287982.2023.2280275","DOIUrl":"https://doi.org/10.1080/13287982.2023.2280275","url":null,"abstract":"","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139270341","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}

{"title":"Performance of delaminated CFRP composite under pure bending using two-dimensional digital image correlation","authors":"Kopparthi Phaneendra Kumar, Srikar Gemaraju, Bhaskara Rao Pathakokila, Suresh Gamini","doi":"10.1080/13287982.2023.2275807","DOIUrl":"https://doi.org/10.1080/13287982.2023.2275807","url":null,"abstract":"ABSTRACTDelamination is an interlaminar damage which may be pre-existing in multilayered fibre reinforced polymer composite parts due to manufacturing imperfections or generated by out of plane loading during service life. Its existence leads to significant reduction of structural integrity, strength and stiffness of the material. Hence, to study the effect of induced delamination on the performance of a composite under pure bending, a circular polytetrafluoroethylene (PTFE) film was introduced between the second and third plies of a sixteen layered carbon/epoxy laminate during fabrication. The bending tests were conducted in displacement control mode. The displacements and strains were measured through the thickness of the composite using two-dimensional digital image correlation. The damage modes were captured using CCD camera and the causes were explained. The flexural strength and modulus of composite were 329.74 MPa and 104.58 GPa respectively. The delaminated composite behaved as a single member without any crack within the elastic range. The existence of PTFE drastically reduced flexural stiffness of composite beyond the stress at 75.81% of its ultimate strength. The ± 45º plies offered low mechanical performance against the induced off axis loading. Hence, in these plies fibre breakage was higher. In the portion of PTFE, the strains were higher due to larger outward displacements produced by local buckling.KEYWORDS: Carbon fibreartificial delaminationflexural strengthdigital image correlation (DIC)damagelocal buckling AcknowledgmentsAuthors are grateful to Dr. Ramji Manoharan, Professor & Head, Department of Mechanical and Aerospace Engineering, Indian Institute of Technology, Hyderabad, India for the permission given to work in composites laboratory. Authors are also thankful to Dr. Gangadharan Raju, Associate Professor, Department of Mechanical and Aerospace Engineering, Indian Institute of Technology, Hyderabad, India for the suggestions given to carry out this work. They are grateful to Mr. Lala Bahadur Andraju and Mr. M. Seshadri, Former Research Scholars, Department of Mechanical and Aerospace Engineering, Indian Institute of Technology, Hyderabad, India for their advice given to conduct experiments.Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingThis study was not funded by any organization.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135341882","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}

{"title":"An experimental study on mechanical behaviour of concrete by partial replacement of sand with brick fines","authors":"M. Sweety Poornima Rau, Y. M. Manjunath","doi":"10.1080/13287982.2023.2269633","DOIUrl":"https://doi.org/10.1080/13287982.2023.2269633","url":null,"abstract":"ABSTRACTHeat is one of the primary factors that causes concrete structures to deteriorate over time and enhance concrete’s structural properties. In an experimental investigation, brick fines were substituted for sand at different percentages of 5%, 10%, 15%, and 20% to test the mechanical behaviour of concrete exposed to high temperatures. At 15% replacement of brick powder, the maximal strength at standard temperatures had attained. An optimal concrete and ordinary concrete had then been exposed for 2 h at temperatures ranging from 100°C to 600°C at 100°C intervals. The quality check and strength characteristics of replacement and conventional concrete were evaluated, including weight loss, Ultrasonic Pulse Velocity (UPV), rebound hammer, and compressive, tensile, and flexural strengths at ambient and high temperatures. The quality of concrete decreased with temperature increase because of crack development and incompatible deformation between aggregate and cement paste. The strength decreased with increased temperature because of calcium silicate hydrate (CSH) breakdown and capillary water evaporation. Furthermore, a particular temperature at which cracks appear in concrete specimens exposed to high temperatures had determined using Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) analyses. The brick powder performed better in enhancing the concrete’s strength characteristics after being heated.KEYWORDS: Brick finescompressive strengthelevated temperatureenergy dispersive spectroscopy analysisflexural strengthscanning electron microscopy analysis Disclosure statementNo potential conflict of interest was reported by the author(s).Availability of dataData available on request from the authors.PolicyBasic, share upon request.Data availability statementThe data that support the findings of this study are available from the corresponding author, [author initials], upon reasonable request.Author Contribution StatementSweety Poornima Rau: Conceptualisation; Data curation; Investigation; Methodology; Resources; Writing original draft; Review and writing;M. Manjunath: Visualisation; Supervision; Formal analysis; Project administrationThe corresponding author is responsible for ensuring that the descriptions are accurate and agreed by all authors.The role(s) of all authors listed using the above relevant categories.Authors may have contributed in multiple roles.Credit in no way changes the journal’s criteria to qualify for the authorship.Statements and DeclarationsOn behalf of all authors, the corresponding author states that there is no conflict of interest.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135876627","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}

{"title":"Significance of construction sequence and the initial behaviour in concrete-faced rockfill dams","authors":"Sachintha Tennekoon Mudiyanselage, Kushan Wijesundara, Srikanth Venkatesan, Saman De Silva, Ranjith Dissanayake, Panduka Neluwala","doi":"10.1080/13287982.2023.2268288","DOIUrl":"https://doi.org/10.1080/13287982.2023.2268288","url":null,"abstract":"Finite Element Model simulations are widely used to validate experimental and field observations. Out of these, modelling and comparing the stability of dams under various loading conditions presents significant challenges for researchers and practitioners, none more than the concrete-faced rockfill dams that are present in Australia (e.g. Cethana dam) and around the globe. A review shows that the construction sequence of such dams has not been incorporated in the initial configuration of concrete-faced rockfill dams. In this research, static analysis has been conducted for 2D and 3D finite element models of the Kotmale concrete-faced rockfill dam (CFRD) with and without the construction stage. Both 2D and 3D analysis of the case study dam using MIDAS FEA NX software and static analysis have been conducted. A linear elastic material model and a nonlinear material model (Duncan and Chang EB Model) were used to model the rockfill material. The resulting deformations were compared with the in-situ measurements to identify the accuracy of the developed cases. Results show that construction stage inclusion and the nonlinear material model agree well with the in-situ measurements, warranting the need for such advancements in Finite Element Analysis. Such an inclusion can model future settlement behaviour reasonably well, which can lead to the development of appropriate management measures.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135993150","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}

{"title":"Characteristics of earthquake ground motions requiring extended dynamic analysis","authors":"Jiang Yi, Hing-Ho Tsang","doi":"10.1080/13287982.2023.2265761","DOIUrl":"https://doi.org/10.1080/13287982.2023.2265761","url":null,"abstract":"The absolute maximum response (AMR) of structures might occur posterior to the end of earthquake excitations, hence, extending the dynamic analysis to the post-shaking phase is required. This phenomenon was found to be more common for long-period and low-damping structures, which are prevailing in regions of low-to-moderate seismicity like Australia. In this article, the mechanism of the occurrence of AMR in the post-shaking phase is first explained using single-degree-of-freedom (SDOF) systems subjected to a simple sine wave. Further investigation on real earthquake ground motions reveals that whether an extended analysis is required depends greatly on the characteristics of the post-significant duration phase. Finally, suitable metrics for describing ground motions that require extended analysis (EAGMs) are identified based on the Kolmogorov–Smirnov test. Regression analyses are then conducted to predict the probability of EAGMs.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135197743","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}

{"title":"Load distribution factors for quick design and assessment in typical Australian bridges","authors":"Setthawuth Yuprasert, Tariq Maqsood, Srikanth Venkatesan, Ricky Chan","doi":"10.1080/13287982.2023.2255457","DOIUrl":"https://doi.org/10.1080/13287982.2023.2255457","url":null,"abstract":"The increase in freight productivity in Australia is pressuring Australian bridge infrastructure. Bridge assessment is crucial to ensure the safety of bridges to accommodate heavier vehicles. Load distribution factor (LDF) has been widely used for bridge design and evaluation in the preliminary stage, but it is not specified in the Australian standard code. This study aims to develop the LDFs for typical Australian bridges with the most adverse load effects of single- and two-lane loads. Later, the LDFs were compared with the LDF equations in the different standards, including National Association of Australian State Road Authorities (National Association of Australian State Road Authorities, 1976), American Association of Highway and Transportation Officials: Load and Resistance Factor Design (AASHTO (2017), Henry’s and modified Henry’s methods. It can be concluded that the AASHTO (2017) LDF equations provide very good correlations with typical Australian bridges. It is possible to use the AASHTO LRFD LDF equations for assessing and designing in Australian concrete I-girder and Super-T girder bridges. However, most AASHTO LFRD provides conservative results of LDFs compared with LDFs of Australian bridges. It is recommended that LDFs of Australian bridges should be developed for bridge design and assessment.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135689864","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}

{"title":"Development of Prediction Models for Shear Strength of FRP Reinforced Fibrous Concrete Beams without Stirrups Using ANN and Nonlinear Regression","authors":"Ghazi Bahroz Jumaa, Ghafur H. Ahmed, Nasih Habeeb Askandar","doi":"10.1080/13287982.2023.2254035","DOIUrl":"https://doi.org/10.1080/13287982.2023.2254035","url":null,"abstract":"The shear behaviour of fibre-reinforced polymer reinforced concrete (FRP-RC) beams without web reinforcement suffers from low strength, low stiffness, more brittleness and wide and quick propagated cracks. Fortunately, the addition of various types of fibres could improve most of these weaknesses. On the other hand, the shear strength prediction of FRP-RC beams with various types of fibres is one of the most complex cases in structural engineering applications. Developing generalised, precise and consistent prediction models are necessary and very limited. This paper investigates the impacts of various types of fibres on shear strength and presents proposing four new prediction models, utilising artificial neural networks and empirical nonlinear regression analysis, and modifying the combination of available models based on a collected database of 49 shear test results of FRP-RC members with various types of fibres. The comparison of the developed models with the available equations from the literature indicates that the developed models yielded excellent performance, great efficiency and a high level of accuracy over all other existing models. Additionally, the parametric study confirmed that all the developed models have great abilities to accurately predict the actual response of each parameter, in spite of its complexity, on the shear strength of FRP-reinforced fibrous concrete beams without stirrups.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136072227","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}

{"title":"Investigation of pull-out characteristics of connections for post-installed rebar utilizing mortar-based binders and chemical adhesives","authors":"Anas Shahid Multani, P. K. Gupta","doi":"10.1080/13287982.2023.2247288","DOIUrl":"https://doi.org/10.1080/13287982.2023.2247288","url":null,"abstract":"","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77325430","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}

{"title":"Damage analysis and energy absorption capacity of hollow square steel tubes subjected to conical hammer impact","authors":"Nirmal Rakeshbhai Ravaliya, Pramod Kumar Gupta","doi":"10.1080/13287982.2023.2242097","DOIUrl":"https://doi.org/10.1080/13287982.2023.2242097","url":null,"abstract":"","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73604467","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}

{"title":"Towards sustainability in post-disaster constructions with a modular prefabricated structure","authors":"Hatef Jafari Sharami, Siavash Teimouri","doi":"10.1080/13287982.2023.2232675","DOIUrl":"https://doi.org/10.1080/13287982.2023.2232675","url":null,"abstract":"ABSTRACT In response to the challenges faced by post-disaster construction, the present study endeavours to offer an improved solution in a practical manner. To this end, a critical analysis of modular systems that can be employed in post-disaster construction is conducted, which is succeeded by the set of required features. Considering these features, a system based on modular prefabricated components (MPC) is presented, which effectively eliminates all hitches while demonstrating facilitated solutions. From a practical standpoint, a comprehensive description of the structure’s dimensions, assembly steps and design constraints are proffered, accompanied by primary structural analysis factoring in the highest risk categories. The applicability and limitations of the system in post-disaster scenarios are also discussed in comparison to other modular construction methods. The findings indicate that the system exhibits high levels of disjoint-ability and collectability, flexibility and customisability, developability and repairability, in addition to being cost- and time-efficient. Furthermore, it demonstrates a favourable response to the predicaments posed by post-disaster situations, such as logistics, construction process, safety, seismic behaviour and environmental effects. Overall, this research highlights the applicability and potential of MPC systems in post-disaster construction and delivers a valuable output for policymakers, managers, architects and engineers involved in this regard.","PeriodicalId":45617,"journal":{"name":"Australian Journal of Structural Engineering","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81415299","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}