Journal of Science and Technology in Civil Engineering (STCE) - NUCE最新文献_第6页

Static analysis of four-parameter functionally graded plates with general boundary conditions 一般边界条件下四参数功能梯度板的静力分析

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-04-30 DOI: 10.31814/STCE.NUCE2019-13(2)-02

H. Phuong, Tran Huu Quoc, H. Hien

引用次数: 1

Assessment of wastewater management in Mekong river delta region 湄公河三角洲地区污水管理评价

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-04-30 DOI: 10.31814/STCE.NUCE2019-13(2)-08

Dang Thi Thanh Huyen, Trinh Dinh Lai

引用次数: 3

Application of hybrid modified UASB - MBBR technology for wastewater treatment of Sao Thai Duong Pharmaceuticals and Cosmetics Factory 混合改性UASB - MBBR技术在圣泰阳药厂废水处理中的应用

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-04-30 DOI: 10.31814/STCE.NUCE2019-13(2)-10

T. X. Duc, L. Tuan

{"title":"Application of hybrid modified UASB - MBBR technology for wastewater treatment of Sao Thai Duong Pharmaceuticals and Cosmetics Factory","authors":"T. X. Duc, L. Tuan","doi":"10.31814/STCE.NUCE2019-13(2)-10","DOIUrl":"https://doi.org/10.31814/STCE.NUCE2019-13(2)-10","url":null,"abstract":"Wastewater of Sao Thai Duong Pharmaceuticals & Cosmetics Factory contains high concentration (more than 1000 mg/l) COD and BOD. Besides, some persistent substances are also found such as surfactants, emulsion oil and ammonium. Especially, the quite low BOD/COD ratio of 0.3 makes the treatment process of organic matters more complicated. Furthermore, the troublesome settlement of oil emulsions inhibits the wastewater biological treatment process which results in difficulties for selection of a stable and sustainable technology. For these reasons, it is recommended to use the Upflow Anaerobic Sludge Blanket Filtration (UASB) technique combined with the use of the bio-logical named carriers DHY-01 and DHY-02 (produced by Vinse Company). DHY carriers have a high porosity (92-96%), large surface area (10000-12000 m2) and apparent specific weight of 33 g/l. The anaerobic treatment tank (Upflow Blanket Filter - UBF) has a retention time of 10-12 hours. Influent COD concentration is about 1000-2000 mg/l, reduced by 65-70% after treatment. Influent BOD concentration is 200-600mg/l, reduced by about 60-65% after treatment. Aerobic tank (moving bed biofilm reactor - MBBR) has a retention time of 4-6 hours. COD and ammonium removal efficiency is about 85-90%.","PeriodicalId":17004,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - NUCE","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87229241","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

Free-vibration analysis of multi-directional functionally graded plates based on 3D isogeometric analysis 基于三维等几何分析的多向功能梯度板自由振动分析

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-04-30 DOI: 10.31814/STCE.NUCE2019-13(2)-01

T. Son, Thai Huu-Tai

引用次数: 10

A 2D model for analysis of rain-wind induced vibration of stay cables 斜拉索风雨振动分析的二维模型

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-04-30 DOI: 10.31814/STCE.NUCE2019-13(2)-04

Truong Viet Hung, Vũ Quang Việt

引用次数: 3

Evaluation of ion exchange material from sulfonated polystyrene waste synthesized for removal Cr3+ from aqueous solution by column experiment 用柱法评价磺化聚苯乙烯废合成的离子交换材料去除水溶液中Cr3+的性能

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-04-30 DOI: 10.31814/STCE.NUCE2019-13(2)-09

P. Thuy

{"title":"Evaluation of ion exchange material from sulfonated polystyrene waste synthesized for removal Cr3+ from aqueous solution by column experiment","authors":"P. Thuy","doi":"10.31814/STCE.NUCE2019-13(2)-09","DOIUrl":"https://doi.org/10.31814/STCE.NUCE2019-13(2)-09","url":null,"abstract":"The paper aims to study the effect of operating conditions in the column experiment with the ion exchange material which was prepared in optimum synthesized conditions. Polystyrene waste from disposable food packaging was dissolved in cyclohexane and sulfonated by sulfuric acid to synthesize cation exchange materials which were applied to remove Cr3+ in water by the ion exchange principle. The optimum conditions for this method were found out and described in previously published literature of the author. Characterization by SEM and Fourier Transforms Infrared (FT-IR) spectroscopy proved that the additional Sulfonic groups were presented. The efficiency of Cr3+ removal was highly affected by column bed height, initial ion concentrations and flow rate of effluent. The highest efficiency of material was 84.0% with a material bed height of 10 cm in the removal of Cr3+ from simulated wastewater containing initial Cr3+ concentration of 120 mg/l. The experimental data obtained from this study was consistent with Thomas and Yoon-Nelson kinetic models, which will be applied for column design in practical study and design. The results from this method can help reduce the plastic waste and easy to apply in practice for removal of Cr3+ in wastewater. \u0000Keywords: ion exchange; polystyrene waste; synthesize; chromium.","PeriodicalId":17004,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - NUCE","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89232075","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

The importance of public spaces to social integration for young migrant workers in Hanoi 公共空间对河内年轻移民工人社会融合的重要性

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-04-30 DOI: 10.31814/STCE.NUCE2019-13(2)-11

Le Lan Huong

{"title":"The importance of public spaces to social integration for young migrant workers in Hanoi","authors":"Le Lan Huong","doi":"10.31814/STCE.NUCE2019-13(2)-11","DOIUrl":"https://doi.org/10.31814/STCE.NUCE2019-13(2)-11","url":null,"abstract":"In Hanoi, there are currently tens of thousands of migrants working in peri-urban industrial zones and small-scale private manufacturing workshops in the inner city and construction sites. Many of them live in precarious houses, where the quality of life is rather poor, and they travel with little integration. For this reason, this project has been carried out and investigated how public spaces are used by the migrant workers, hereby finding out the difficulties they may have encountered while trying to integrate into the local community and suggesting some solutions to their integration by means of public space design. The main research methods include the qualitative survey with half-structured interviews conducted in three wards: Truong Dinh, Thuy Phuong and Sai Dong. The research outcomes reveal the most frequently-visited places among young migrant workers. It is noticeable that they do not go there very often. The main reason for this fact is that they do not have enough time or money. In addition, there is a lack of good-quality public space near their homes and their understanding of the importance of public space remains incomplete. This study also suggests that how those public buildings could be created for those workers to attend public activities. Then social connections will be cemented.Keywords: migrant workers; social integration; public spaces.","PeriodicalId":17004,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - NUCE","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89998391","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

An experimental study on flexural behavior of corroded reinforced concrete beams using electrochemical accelerated corrosion method 用电化学加速腐蚀法对腐蚀钢筋混凝土梁的弯曲性能进行了试验研究

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-01-31 DOI: 10.31814/STCE.NUCE2019-13(1)-01

N. N. Tan, N. Nguyen

{"title":"An experimental study on flexural behavior of corroded reinforced concrete beams using electrochemical accelerated corrosion method","authors":"N. N. Tan, N. Nguyen","doi":"10.31814/STCE.NUCE2019-13(1)-01","DOIUrl":"https://doi.org/10.31814/STCE.NUCE2019-13(1)-01","url":null,"abstract":"This study investigated experimental bearing capacity of corroded reinforced concrete beams. Six testing beams were made of concrete having compressive strength of 25 MPa, with the dimensions of 1200 x 80 x 120 mm. They were divided into two groups depending of tension reinforcement ratio. Of which, two beams were used as the controls, whereas the other fours ones having tension reinforcement were subjected to corrosion by the electrochemical accelerated corrosion method. After accelerated corrosion, the beams were tested under monotonic loading to investigate their performance. All the tested beams were failed in flexural failure mode corresponding to spalling of cover concrete. Test results showed that as corrosion rate in tension reinforcement increased, the lower cracking load and the displacement at the cracking load were observed. As the corrosion rate of tension reinforcement ranging from 7.5% to 8.3%, it had little effect on the peak load. As the corrosion rate increased further, approximately 10.8% and 14.1% in this study, the peak load decreased significantly. The higher the corrosion rate, the lower the displacement of corroded beams. Moreover, as corrosion rate of tension reinforcement increased the number of concrete cracks and their spacing reduced, and the width of cracks was generally larger. \u0000Keywords: reinforced concrete beam; electrochemical accelerated corrosion; corrosion rate; load-carrying capacity; displacement; concrete cracking. \u0000Received 08 January 2019, Revised 16 January 2019, Accepted 17 January 2019 \u0000 ","PeriodicalId":17004,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - NUCE","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80882151","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: 9

Bending analysis of functionally graded beam with porosities resting on elastic foundation based on neutral surface position 基于中性面位置的弹性地基多孔功能梯度梁弯曲分析

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-01-31 DOI: 10.31814/STCE.NUCE2019-13(1)-04

Nguyen Thi Hong Phuong, T. M. Tu, H. Phuong, Nguyen Van Long

{"title":"Bending analysis of functionally graded beam with porosities resting on elastic foundation based on neutral surface position","authors":"Nguyen Thi Hong Phuong, T. M. Tu, H. Phuong, Nguyen Van Long","doi":"10.31814/STCE.NUCE2019-13(1)-04","DOIUrl":"https://doi.org/10.31814/STCE.NUCE2019-13(1)-04","url":null,"abstract":"In this paper, the Timoshenko beam theory is developed for bending analysis of functionally graded beams having porosities. Material properties are assumed to vary through the height of the beam according to a power law. Due to unsymmetrical material variation along the height of functionally graded beam, the neutral surface concept is proposed to remove the stretching and bending coupling effect to obtain an analytical solution. The equilibrium equations are derived using the principle of minimum total potential energy and the physical neutral surface concept. Navier-type analytical solution is obtained for functionally graded beam subjected to transverse load for simply supported boundary conditions. The accuracy of the present solutions is verified by comparing the obtained results with the existing solutions. The influences of material parameters (porosity distributions, porosity coefficient, and power-law index), span-to-depth ratio and foundation parameter are investigated through numerical results. \u0000Keywords: functionally graded beam; bending analysis; porosity; elastic foundation; bending; neutral surface. \u0000Received 10 December 2018, Revised 28 December 2018, Accepted 24 January 2019","PeriodicalId":17004,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - NUCE","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78549678","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: 20

Evaluation of ultimate bending moment of circular concrete–filled double skin steel tubes using finite element analysis 用有限元法计算圆形双层钢管混凝土的极限弯矩

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-01-31 DOI: 10.31814/STCE.NUCE2019-13(1)-03

Vũ Quang Việt, H. Ha, Pham Thai Hoan

{"title":"Evaluation of ultimate bending moment of circular concrete–filled double skin steel tubes using finite element analysis","authors":"Vũ Quang Việt, H. Ha, Pham Thai Hoan","doi":"10.31814/STCE.NUCE2019-13(1)-03","DOIUrl":"https://doi.org/10.31814/STCE.NUCE2019-13(1)-03","url":null,"abstract":"In this study, the ultimate bending moment of circular concrete-filled double skin steel tubes (CFDSTs) was investigated. A CFDSTs made of two concentric circular steel tubes with concrete infill and M16 shear connector system was fabricated. The four-point bending test of the 10 m long CFDST consisting of outer and inner steel tubes with 914.4 mm and 514.4 mm in diameter, respectively, was carried out and the ultimate bending moment of the CFDST was investigated. A finite element (FE) simulation of the CFDSTs subjected to bending was developed using the commercial software ABAQUS and the accuracy of the developed FE model was verified by comparing to the experimental result. The ultimate bending moment of CFDSTs was then evaluated with respect to different concrete infill compressive strengths and yield strengths of the steel tubes. The corresponding design ultimate bending moments of the CFDST with regard to the design codes AISC and EC4 were also computed. The results revealed that EC4 and AISC can accurately predict the ultimate moment capacities of the CFDST with shear connector. \u0000Keywords: ultimate bending moment; concrete-filled double skin tube; shear connector system; finite element analysis. \u0000Received 19 November 2018, Revised 04 January 2019, Accepted 04 January 2019","PeriodicalId":17004,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - NUCE","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77202103","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: 7