Journal of Science and Technology in Civil Engineering (STCE) - HUCE最新文献_第5页

Evaluation of the suitability of pepper mild mottle virus (PMMoV) as an indicator virus for water safety and quality 辣椒轻度斑驳病毒(PMMoV)作为水质安全指示病毒的适宜性评价

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2022-04-29 DOI: 10.31814/stce.huce(nuce)2022-16(2)-07

V. Canh, Nguyen Thuy Lien, T. Nga

{"title":"Evaluation of the suitability of pepper mild mottle virus (PMMoV) as an indicator virus for water safety and quality","authors":"V. Canh, Nguyen Thuy Lien, T. Nga","doi":"10.31814/stce.huce(nuce)2022-16(2)-07","DOIUrl":"https://doi.org/10.31814/stce.huce(nuce)2022-16(2)-07","url":null,"abstract":"Wastewater pollution is one of the main causes of waterborne diseases (e.g., diarrheal diseases) because wastewater commonly contains a wide range of pathogenic microorganisms, notably human enteric viruses. Monitoring multiple pathogenic viruses in waters simultaneously is impractical and expensive, so monitoring through virus indicators is essential to ensure water safety and quality. Recently, pepper mild mottle virus (PMMoV) was found as one of the most prevalent viruses in the human gut microbiota and consistently present at high concentrations in human feces and domestic wastewater. This study reviewed the latest information on the presence of PMMoV and human enteric viruses in water environments and in wastewater (water) treatment systems to evaluate the suitability of PMMoV as an indicator virus for water safety and quality. PMMoV was present in all types of waters (e.g., wastewater, surface water, groundwater, coastal water and drinking water) in greater prevalence than human enteric viruses. PMMoV was also removed less or similar to human enteric viruses in various wastewater (water) treatment systems (including disinfection treatment). These results suggest that PMMoV can be used as a suitable indicator virus for 1) assessment of water quality polluted by domestic wastewater; 2) assessment of virus removal efficiency in drinking water treatment plants and 3) assessment of viral safety for drinking water.","PeriodicalId":387908,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - HUCE","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131348975","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

Small public spaces in the residential quarters of Hanoi’s historical inner city-toward sustainable development 河内历史悠久的内城住宅区的小型公共空间朝向可持续发展

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2022-04-29 DOI: 10.31814/stce.huce(nuce)2022-16(2)-08

T. Q. Hoa

引用次数: 0

Predicting dynamic responses of frame structures subjected to stochastic wind loads using temporal surrogate model 用时间替代模型预测随机风荷载作用下框架结构的动力响应

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2022-04-29 DOI: 10.31814/stce.huce(nuce)2022-16(2)-09

Dang Viet Hung, N. Thang

{"title":"Predicting dynamic responses of frame structures subjected to stochastic wind loads using temporal surrogate model","authors":"Dang Viet Hung, N. Thang","doi":"10.31814/stce.huce(nuce)2022-16(2)-09","DOIUrl":"https://doi.org/10.31814/stce.huce(nuce)2022-16(2)-09","url":null,"abstract":"Determining structures' dynamic response is a challenging and time-consuming problem because it requires iteratively solving the governing equation of motion with a significantly small time step to ensure convergent results. This study proposes an alternative approach based on the deep learning paradigm working in a complementary way with conventional methods such as the finite element method for quickly forecasting the responses of structures under random wind loads with reasonable accuracy. The approach works in a sequence-to-sequence fashion, providing a good trade-off between the prediction performance and required computation resources. Sequences of known wind loads plus time history response of the structure are aggregated into a 3D tensor input before going through a deep learning model, which includes a long short-term memory layer and a time distributed layer. The output of the model is a sequence of structures' future responses, which will subsequently be used as input for computing structure' next response. The credibility of the proposed approach is demonstrated via an example of a two-dimensional three-bay nine-story reinforced concrete frame structure.","PeriodicalId":387908,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - HUCE","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123100236","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

Lightweight foamed concrete reinforced with different polypropylene fiber contents 用不同聚丙烯纤维含量增强的轻质泡沫混凝土

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2022-04-29 DOI: 10.31814/stce.huce(nuce)2022-16(2)-11

Si-Huy Ngo, Trong‐Phuoc Huynh

{"title":"Lightweight foamed concrete reinforced with different polypropylene fiber contents","authors":"Si-Huy Ngo, Trong‐Phuoc Huynh","doi":"10.31814/stce.huce(nuce)2022-16(2)-11","DOIUrl":"https://doi.org/10.31814/stce.huce(nuce)2022-16(2)-11","url":null,"abstract":"The combined utilization of fly ash and ground granulated blast-furnace slag as a partial cement substitution in the production of lightweight foamed concrete (LFC) incorporating different polypropylene (PP) fiber was investigated in this study. The LFC was prepared with a target dry density of 1200 ± 50 kg/m3 and the influence of PP fiber contents (e.g., 0, 0.3, 0.6, and 1.0% by volume) on the characteristics of LFC was examined in terms of fresh unit weight, dry density, water absorption, thermal conductivity, compressive strength, flexural strength, ultrasonic pulse velocity (UPV), and microstructural analysis using scanning electron microscopy (SEM) technique. Results show that the inclusion of PP fiber affected all of the studied characteristics of LFC. Increasing PP fiber percentages resulted in reducing dry density, thermal conductivity, and UPV. Whereas, both the mechanical strength and water absorption were found to be increased with PP fiber content. The result of the SEM analysis also supported these findings. At 28 days, all of the LFC obtained the target dry density of 1200 ± 50 kg/m3, satisfying the requirements of TCVN 9029:2017. The water absorption, thermal conductivity, UPV, compressive strength, and flexural strength values of the LFC specimens were recorded at the respective ranges of below 10%, 0.394 – 0.461 W/mK, 2955 – 3019 m/s, 15.98 – 17.33 MPa, and 2.31 – 4.07 MPa. Furthermore, the results suggested that 1.0% PP fiber was the most suitable level for the production of LFC.","PeriodicalId":387908,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - HUCE","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133604082","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: 1

Effects of lightweight particle content on the mechanical strength of cylindrical aggregates 轻质颗粒含量对圆柱形集料机械强度的影响

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2022-04-29 DOI: 10.31814/stce.huce(nuce)2022-16(2)-10

Ho Van Nhat Phong, V. T. Trung, T. D. Minh, Nguyen Van My, Vu Thi Lo

{"title":"Effects of lightweight particle content on the mechanical strength of cylindrical aggregates","authors":"Ho Van Nhat Phong, V. T. Trung, T. D. Minh, Nguyen Van My, Vu Thi Lo","doi":"10.31814/stce.huce(nuce)2022-16(2)-10","DOIUrl":"https://doi.org/10.31814/stce.huce(nuce)2022-16(2)-10","url":null,"abstract":"\u0000 \u0000 \u0000 \u0000By using an extensive three-dimensional discrete element method, we numerically investigate the effects of lightweight particle content on the mechanical strength of the cylindrical aggregates, randomly composed of two different groups of primary particles: light (low stiffness) and heavy (high stiffness), and the stress contribution of the heavy-heavy, light-heavy, and light-light interactions on the mechanical behavior of such aggregates, subjected to the compression test by using a constant downward velocity. The interactions between primary particles are modeled by using the frictional-contact force law with a giving approximate analytical expression of capillary cohesion forces. We found that the lightweight particle content significantly affects the mechanical stress of aggregates and stress contribution obtained by different interaction types above, and the stress obtained by heavy-heavy interactions strongly dominates the mechanical strength of agglomerates. Remarkably, meanwhile, the stress obtained by the heavy-heavy contacts gradually decreases with increasing the lightweight particle content up to 20%, leading to the decrease of the mechanical strength, the stresses obtained by light-light and light-heavy contacts increase gradually. For higher lightweight particle contents, the results continuously show the same tendencies but with lower rates. \u0000 \u0000 \u0000 \u0000","PeriodicalId":387908,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - HUCE","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132053670","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

Modified AK-MCS method and its application on the reliability analysis of underground structures in the rock mass 改进AK-MCS法及其在岩体地下结构可靠度分析中的应用

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2022-04-28 DOI: 10.31814/stce.huce(nuce)2022-16(2)-04

N. Tran, D. Do, D. Hoxha, M. Vu, G. Armand

{"title":"Modified AK-MCS method and its application on the reliability analysis of underground structures in the rock mass","authors":"N. Tran, D. Do, D. Hoxha, M. Vu, G. Armand","doi":"10.31814/stce.huce(nuce)2022-16(2)-04","DOIUrl":"https://doi.org/10.31814/stce.huce(nuce)2022-16(2)-04","url":null,"abstract":"This work aims at proposing the methodology on the basis of the extension of the famous reliability analysis, joining the Kriging and Monte Carlo Simulation (AK-MCS) metamodeling technique for analyzing the long-term stability of deep tunnel support constituted by two layers (a concrete liner covered with a compressible layer). A novel active learning function for selecting new training points enriches the Design of Experiment (DoE) of the built surrogate. This novel learning function, combined with an appropriate stopping criterion, improves the original AK-MCS method and significantly reduces the number of calls to the performance function. The efficiency of this modified AK-MCS method is demonstrated through two examples (a well-known academic problem and the case of a deep tunnel dug in the rock working viscoelastic Burgers model). In these examples, we illustrate the accuracy and performance of our method by comparing it with direct MCS and well-known Kriging metamodels (i.e., the classical AK-MCS and EGRA methods). ","PeriodicalId":387908,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - HUCE","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115012782","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

Experimental studies on behaviors of reinforced concrete column structures made of recycled aggregates under concentric loads 同心荷载作用下再生骨料钢筋混凝土柱结构性能试验研究

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2022-04-09 DOI: 10.31814/stce.huce(nuce)2022-16(2)-01

N. Quang, T. Cuong, N. N. Tan, N. H. Tan, K. Kawamoto, N. H. Giang

{"title":"Experimental studies on behaviors of reinforced concrete column structures made of recycled aggregates under concentric loads","authors":"N. Quang, T. Cuong, N. N. Tan, N. H. Tan, K. Kawamoto, N. H. Giang","doi":"10.31814/stce.huce(nuce)2022-16(2)-01","DOIUrl":"https://doi.org/10.31814/stce.huce(nuce)2022-16(2)-01","url":null,"abstract":"The paper presents experimental results and structural analysis of reinforced concrete (RC) columns made of recycled aggregate concrete (RAC) and natural aggregate concrete (NAC) under concentric compressive load. The ratio of recycled aggregates in mixture (i.e, replacement ratio, r in %) was 0, 50, and 100% by mass, where r = 0% corresponding to NAC. The load and deformation curves including cracking load, ultimate load, crack width, and compressive strain of the tested columns, were analyzed to determine the effects of replacement ratio of recycled aggregate on the behaviors of square column structures. The results show that the increase of r reduced the load-carrying capacity of RC columns under the concentric compressive load. Horizontal and vertical cracks also were observed immediately for tested columns with high r. The effect of r of RAC on the mechanical behaviros, however, became relatively small and did not affect the behaviors of RAC columns, indicating that the RAC tested in this study was feasible for use in recycled concrete structures.","PeriodicalId":387908,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - HUCE","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123841093","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: 1

Optimum location of a single longitudinal stiffener with various cross-section shapes of steel plate girders under bending loading 弯曲荷载作用下不同截面形状钢板梁纵向加劲肋的最优位置

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2022-04-01 DOI: 10.31814/stce.huce(nuce)2022-16(2)-06

G. Papazafeiropoulos, Q. Vu, Viet-Son Nguyen, V. Truong

引用次数: 3

A hybrid arithmetic optimization algorithm and differential evolution for optimization of truss structures subjected to frequency constraints 频率约束下桁架结构的混合优化算法与差分进化算法

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2022-04-01 DOI: 10.31814/stce.huce(nuce)2022-16(2)-03

Dieu T. T. Do, T. Nguyen, Quoc-Hung Nguyen, T. Bui

{"title":"A hybrid arithmetic optimization algorithm and differential evolution for optimization of truss structures subjected to frequency constraints","authors":"Dieu T. T. Do, T. Nguyen, Quoc-Hung Nguyen, T. Bui","doi":"10.31814/stce.huce(nuce)2022-16(2)-03","DOIUrl":"https://doi.org/10.31814/stce.huce(nuce)2022-16(2)-03","url":null,"abstract":"A new hybrid arithmetic optimization algorithm (AOA) associated with differential evolution (DE) is developed for truss optimization. The development is named as ADE with the goal of maintaining a balance between low computational cost and good solution quality. Besides, several limitations of the AOA, which include the inefficiency of the exploration phase and the inconvenient use of two parameters MOA and MOP to find the optimal solution, as well as how to overcome them are also discussed. In terms of AOA in ADE, the exploration phase is removed, and both math optimizer accelerated (MOA) and math optimizer probability (MOP) parameters are adjusted to be independent of the maximum number of iterations. Moreover, the exploitation phase is modified to exploration which helps to limit local solutions and maintain a balance between exploitation and exploration in ADE algorithm. Through a probability parameter, the DE with DE/best/1 operator is executed in ADE to improve exploitation capability as well as convergence rate. Four truss structures with continuous design variables are considered to demonstrate the performance of the current algorithm. The obtained results show that the developed algorithm has a low computational cost, indicating its computational efficiency.","PeriodicalId":387908,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - HUCE","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131949863","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

Influence of microfine-contaminated sand from Mandulog River system in Iligan City, Philippines on the performance of concrete 菲律宾Iligan市Mandulog河水系微污染砂对混凝土性能的影响

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2022-02-05 DOI: 10.31814/stce.huce(nuce)2022-16(2)-02

J. Opon

{"title":"Influence of microfine-contaminated sand from Mandulog River system in Iligan City, Philippines on the performance of concrete","authors":"J. Opon","doi":"10.31814/stce.huce(nuce)2022-16(2)-02","DOIUrl":"https://doi.org/10.31814/stce.huce(nuce)2022-16(2)-02","url":null,"abstract":"The presence of microfines in the concrete matrix is a concern, as it affects the fresh and hardened properties of concrete. As such, aggregates quarried from rivers with considerable amounts of microfines need to undergo a pretreatment process to remove the microfines, which could be a costly endeavor. This is the case for aggregates quarried from Mandulog River in Iligan City, Philippines, where microfines are present. This paper, therefore, set out to find the influence of the microfines on the performance of concrete by determining its effect on the slump, the water demand, and compressive strength of concrete with microfines from 1 to 6% at 1% increment of the weight of fine aggregates. Experimental results showed that microfines in concrete could affect the slump and water demand for concrete minimally. In particular, the compressive strength at the 28th-day curing period was not significantly affected; thus, it can be concluded that microfines of up to 6% of the weight of fine aggregates can be tolerated for concretes produced using aggregates from the Mandulog River system.","PeriodicalId":387908,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - HUCE","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129563250","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