Electronic Journal of Structural Engineering最新文献

{"title":"Machine Learning-based Optimum Reinforced Concrete Design for Progressive Collapse","authors":"M. Esfandiari, Homa Haghighi, G. Urgessa","doi":"10.56748/ejse.233642","DOIUrl":"https://doi.org/10.56748/ejse.233642","url":null,"abstract":"This paper investigated progressive collapse analysis of three-dimensional (3D) reinforced concrete (RC) frames that are optimized for carrying structural loads by introducing a unique simultaneous multi-column removal load path using Machine Learning. The investigation includes formulating an integrated computational framework that incorporates a self-training machine learning algorithm. This algorithm is used to train the largest machine learning models of 3D RC frames containing more than 600 optimized structures to predict the posterior based on the trained priors. The efficiency of the computational framework was shown by conducting a comprehensive study on the optimization and behavior of structures considering seismic loading, alternative load path due to progressive collapse, and second order (P–delta) effects. The results show that the proposed framework ensures that system solutions meet both structural integrity and constructability requirements of the ACI and the Unified Facilities Criteria.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49577763","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":"Research on construction data association management of Urban Rail Transit Based on BIM","authors":"Liangliang Liu, Hongmei Yao, Yanmei Huang, Y. Song","doi":"10.56748/ejse.233611","DOIUrl":"https://doi.org/10.56748/ejse.233611","url":null,"abstract":"With the continuous expansion of the scale of urban rail transit construction projects, it is difficult to improve the coordination in construction and the relevance of construction data. In order to solve the problem of data association in construction, an urban rail transit construction data association management system oriented to BIM Technology is proposed. BIM is used to build a dynamic workflow collaboration architecture to manage the data in urban rail transit construction, so as to realize construction collaborative scheduling. In the test and analysis of the system, the comprehensive ability test of the system shows that the minimum response time of the system can be reduced to 1.2 ms. At the same time, the system has ideal visualization effect and obvious practical value in practical application. Therefore, the urban rail transit construction data association management system based on BIM can show ideal results in complex construction environment, which is of great significance to China's urban construction.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41350269","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":"Comparative Examinations of Structural Responses of Concrete Reinforced with Treated Oil Palm Empty Fruit Bunch (TOPEFB) and Untreated Oil Palm Empty Fruit Bunch (OPEFB) Fibres","authors":"C. Fapohunda, H. B. Adekunle, H. O. Adebayo, V. O. Olapade, A. Kilani","doi":"10.56748/ejse.233891","DOIUrl":"https://doi.org/10.56748/ejse.233891","url":null,"abstract":"The findings from the investigation conducted, to compare the structural performance of concrete containing treated (TOPEFB) and untreated Empty Oil Palm Fruit Bunch (OPEFB) fibres are presented in this paper. For the TOPEFB fibres, the dried fibres were treated with 0.2% NAOH solution following the procedures of appropriate authority. The structural parameters investigated were consistencies, setting times, densities, compressive and tensile strengths of concrete incorporating TOPEFB and OPEFB fibres in the mix. The addition of fibres was limited to 1.20% by weight of cement in the concrete. The interval of addition was 0.2%. The results showed that (i) the setting times of mortars containing TOPEFB fibres were higher than that of mortars with OPEFB fibres, (ii) concrete specimens containing TOPEFB fibres are more workable that concrete specimens with OPEFB fibres, (iii) densities of concrete specimens containing OPEFB fibres were in the range for normal concrete applications while the densities for specimens with TOPEFB developed densities that fell in the heavy weight concrete classification, (iv) concrete specimens containing TOPEFB fibres developed higher compressive strengths than specimens with OPEFB fibres and (v) tensile strengths of concrete specimens containing TOPEFB fibres were higher than specimens with OPEFB fibres by at least 59.04%. The overall conclusion from the findings of this study is that concrete specimens containing TOPEFB fibres have superior structural properties than specimens with OPEFB fibres  ","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45502739","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":"Bridge deck analysis of transversely post-tensioned concrete box girder bridges","authors":"J. Edmunds, L. Franco, T. Jayasinghe, Thusitha Ginigaddara, P. Vaz-Serra, P. Mendis","doi":"10.56748/ejse.234101","DOIUrl":"https://doi.org/10.56748/ejse.234101","url":null,"abstract":"For rural bridges in Australia, a common design practice is pouring in-situ concrete on top of beams in order to tie all the beams together and distribute load. However, pouring concrete on-site creates more risk and contractors prefer to avoid it. Another method is using transverse post tensioning to tie beams. This article investigated the behaviour of transverse post-tensioning bars in providing load distribution between beams and ultimately comment on their effectiveness compared to in-situ poured decks. Currently, the industry has not completely investigated this matter in order to design post-tensioning accurately. Conservative estimates are currently used in industry today. Current practice is 50% of the design load on the beam where the load is applied in their design assumptions which is quite high. The team modelled concrete box girder bridges with transverse post-tensioning using grillage method. Several factors were investigated including bridge length and width, bridge skew and beam type. From the models, the team concluded that increasing the bridge span increases the load distribution, the load distribution difference is negligible for skew between 0 and 20 degrees and larger shear actions are observed with increased skew and width. It was determined that the worst-case total load on the beam where the load as applied was found to be 40.5%, 9.5% less than current practice. It is recommended that a similar investigation is conducted using a finite element method to gain a deeper understanding.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47834585","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":"Research on rockburst proneness evaluation method of deep underground engineering based on multi-parameter criterion","authors":"Fei Sun, Wenlong Wu, Zhi-jia Wang, Zhi-hua Liu, Zhu-wen Shao","doi":"10.56748/ejse.233511","DOIUrl":"https://doi.org/10.56748/ejse.233511","url":null,"abstract":"The study of rockburst criterion is the key to predict the occurrence of rockburst. Based on the energy principle, a new multi-parameter rockburst criterion (RPC) were established. The accuracy and applicability of some typical rockburst engineering examples in China were verified by using some classical rockburst criteria and the newly proposed RPC. The research results show that: RPC comprehensively considers the various stress states of the surrounding rock mass unit, and reflects the integrity factors, mechanical factors, brittleness factors and energy storage factors in the process of rockburst inoculation. Three rockburst classification thresholds (2, 11 and 110) for four grades of none, weak, moderate and severe rockburst were proposed. The prediction and evaluation of rockburst by RPC is basically consistent with the actual situation of rockburst, which can better reflect the overall trend of rockburst failure in deep tunnels.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41967207","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":"Study on Rockburst Tendency of Deep Underground Engineering based on Multi-Factor Influence","authors":"Zi Zhu, Fei Sun, Jiaqi Guo","doi":"10.56748/ejse.233391","DOIUrl":"https://doi.org/10.56748/ejse.233391","url":null,"abstract":"Rockburst disaster seriously threatens the construction schedule of underground tunnel engineering and the safety of construction workers. Rockburst prediction has become one of the critical methods for evaluation of surrounding rock stability and safe construction of deep underground engineering. To further understand the occurrence mechanism of rockburst disaster and predict rockburst in underground engineering more accurately, firstly, the typical rockburst tendency criterion and the critical factors affecting the rockburst development process are systematically summarized and analyzed, and the main control factors reflecting the whole process of rockburst development are screened and analyzed: mechanics, brittleness, integrity, and energy storage factor. Secondly, according to the comprehensive consideration of the main control factors, based on the energy conversion and overall failure mechanism in the process of rock failure, a new multi-parameter rockburst tendency criterion is proposed by comprehensively considering the stress states of rock unit under different stress paths. Finally, the rockburst criterion proposed in this paper is applied to typical engineering cases to verify its rationality and accuracy. Based on a rockburst section in the Sangzhuling tunnel, the possible location of rockburst is simulated based on the 3D discrete element numerical simulation platform, and the rockburst criterion proposed in this paper is further verified by actual engineering. The results show that: the rockburst criterion considering the mechanical factor(σθ/σc), brittleness factor(σc/σt), integrity factor (Kv) and energy storage factor (Ue/U0) can comprehensively and truly reflect the rockburst development process; based on the rockburst tendency criterion proposed in this paper, the occurrence of rockburst in typical engineering cases is calculated and verified, and the predicted results are in good agreement with the actual situation; the numerical simulation of the typical rockburst section prediction in the Sangzhuling tunnel shows that the distribution characteristics of rockburst tendency based on the criterion in this paper are consistent with the on-site rockburst occurrence, and there is a strong rockburst tendency on the right of the tunnel vault, which further verifies the effectiveness and engineering applicability of the criterion in the rockburst tendency prediction. The results of the research can provide some reference for predicting the tendency of rockburst in deep underground engineering.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2023-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44204425","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":"Optimisation of the Construction Plan of Assembled Concrete Structures in Other Courtyard Buildings Based on Grey Clustering","authors":"Mo Chen, Yulong Feng, Weilun Kong","doi":"10.56748/ejse.223523","DOIUrl":"https://doi.org/10.56748/ejse.223523","url":null,"abstract":"The assembled concrete structure is a common construction solution in the current building industry, and it is debatable how to further improve the construction efficiency of the pointed claw assembled concrete structure. The study proposes a grey clustering method based on the improved OWA operator as a means to obtain more effective construction evaluation indicators. In performance tests, it was shown that the grey clustering method under the OWA operator optimisation is more capable of computing features for large amounts of data than traditional grey clustering, with an execution time of less than 200s. In the application tests of the construction scheme, the study showed that the proposed optimisation scheme has a more effective safety evaluation, shorter construction period and lower resource consumption. These results show that the use of grey clustering is effective in optimising the construction of assembled concrete structures, and that the optimised solutions show better reduction in construction time and resource utilisation than traditional construction solutions, so that the rational use of grey clustering in assembled buildings will help the construction industry to achieve greater efficiency in construction.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45433985","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":"Shear Capacity Analysis of Steel Reinforced Lightweight Concrete Elements Based on The Bond Strength","authors":"Jianwen Zhang, Yin ZHANG, Chen Gao, Mengke SHI","doi":"10.56748/ejse.223243","DOIUrl":"https://doi.org/10.56748/ejse.223243","url":null,"abstract":"Push-out tests of steel reinforced lightweight concrete(SRLC) were carried out for nine specimens which were designed according to the orthogonal test method considering four influence factors including strength of lightweight aggregate concrete, stirrup ratio, thickness of protective layer and anchorage length. The curves of average bond stress and loading-end slip were drawn, the characteristics of split failure and push-out failure were analyzed, and the characteristic bond strength was obtained. Combined with the test results of other scholars on the ultimate bond strength of steel reinforced concrete(SRC), it is found that the bond strength of SRLC is not worse than that of normal concrete(NC) which can be taken the same as 0.5MPa. Then the obtained bond strength can be used to calculate the shear strength of SRLC elements which may occur two forms of shear failure-diagonal shear failure and shear bond failure, however, shear bond failure is ignored in some specifications. Shear bond failure capacity computational formula of SRLC elements is deduced into which the bond strength is introduced.To verify the reasonability and accuracy of the proposed approach, the shear capacity and failure pattern are predicted by the proposed means with previous test results and are also compared with other provisions. The analyses and calculations indicate that the proposed method can accurately predict the shear failure mode and the calculated shear capacity values are in better agreement with the experimental results.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":"27 1","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70726640","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":"Behaviour Of Reactive Powder Concrete Hollow Core Columns Strengthened With Carbon Fiber Reinforced Polymer Under Eccentric Loading","authors":"M. Falah, Z. Al-khafaji","doi":"10.56748/ejse.223293","DOIUrl":"https://doi.org/10.56748/ejse.223293","url":null,"abstract":"The behavior of hollow-core columns composed of reactive powder concrete (RPC) contained by a circular carbon fiber reinforced polymer (CFRP) tube is investigated numerically in this work. This research used circular hollow core column samples with an outside diameter of 20.6 cm, an interior diameter of 9cm, and a height of 80cm. These examples have been created utilizing 116 MPa reactive powder concrete. Nine groupings of specimens were created. A control set of nine unconfined hollow columns with stirrups strengthened by 12mm longitudinal bars (HCRPC). Groups two through five have been produced up of RPC hollow column specimens with similar reinforcement but were externally confined with CFRP of 0.131, 0.262, 1.2, and 2.4mm thick (These thicknesses are commercially available (0.131 for CFRP one layer sheet, 0.262 for two layers of CFRP sheet; 1.2 for one layer of CFRP plate. And 2.4 for two-layer of CFRP plate) respectively, placed at mid-length of the columns. Sets six to nine, on the other hand, are identical to the previous sets, but the CFRP restriction has been put at both columns' ends. Axial load thru the column center and uniaxial loading with 2.5 and 5 cm eccentricities from the center were applied to all columns. According to the findings, CFRP confinement boosted the strength of HCRPC columns marginally.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45630909","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":"Cementless building materials made from recycled plastic and sand/glass: a review and road map for the future","authors":"J. S. Perera, P. Mendis, Shanka Kristombu Baduge, Mahak Hashemi","doi":"10.56748/ejse.223773","DOIUrl":"https://doi.org/10.56748/ejse.223773","url":null,"abstract":"Plastic and glass may be sorted using machines and recycled into new plastic and glass as opposed to produce them from raw materials. However, contaminated plastic and sand, as well as certain types of plastic and sand, cannot be recycled using traditional methods and must be disposed of in a landfill. Researchers have been looking into these and have tried a variety of solutions to convert this waste into functional products. The development of composite construction materials based on these two materials was identified as a worthy solution. On the other hand, carbon dioxide emits during the cement manufacturing process and the use of that cement in the production of construction materials contributes 7% of total global greenhouse gas emissions. Hence, plastic sand/glass composite is environmentally friendly in two ways. It reduces landfill while also replacing the equivalent concrete product, lowering CO2 emissions. This paper examines the literature on the development of such materials, including technology, challenges, quality and properties. The development of a glass/sand composite to use as a material in the commercial scale production of roof and pavement tiles is described based on studies that are available.","PeriodicalId":52513,"journal":{"name":"Electronic Journal of Structural Engineering","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2022-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44080413","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}