Journal of Science and Technology in Civil Engineering (STCE) - NUCE最新文献_第3页

Experimental investigation and analytical modeling of the crack width effect on the fire performance of carbon textile-reinforced concrete composite 裂缝宽度对碳纤维布-增强混凝土复合材料防火性能影响的试验研究与分析建模

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2021-01-01 DOI: 10.31814/stce.nuce2021-15(3)-07

Trần Mạnh Tiến, X. H. Vu, E. Ferrier, Pham-Duc Tho, Bui Thi Loan

{"title":"Experimental investigation and analytical modeling of the crack width effect on the fire performance of carbon textile-reinforced concrete composite","authors":"Trần Mạnh Tiến, X. H. Vu, E. Ferrier, Pham-Duc Tho, Bui Thi Loan","doi":"10.31814/stce.nuce2021-15(3)-07","DOIUrl":"https://doi.org/10.31814/stce.nuce2021-15(3)-07","url":null,"abstract":"In comparison with fiber-reinforced polymer (FRP) composite, the textile-reinforced concrete (TRC) presents stability in mechanical performance at elevated temperatures thanks to a thermal protection layer by the cementitious matrix. This paper presents the experimental characterization and analytical modeling for fire performance of carbon TRC under the thermomechanical regime at constant tensile force. The carbon TRC is manufactured from the cementitious matrix with good thermal properties (refractory matrix) and the reinforcement of carbon textiles. In the experiment, the ultimate strength of the carbon TRC specimen was firstly identified from the direct tensile tests at ambient temperature. Afterwards, in the thermomechanical regime, the fire performance of carbon TRC specimens according to 5 loading levels ranging from 10% to 75% related to its ultimate strength was determined. As a result, the effect of crack appearance on this thermomechanical performance was highlighted and analyzed. For the analytical modeling, a model was calibrated with the experimental results to predict the fire performance of carbon TRC by taking into account the effect of crack width.","PeriodicalId":17004,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - NUCE","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75283328","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

Analysis of non-uniform hexagonal cross-sections for thin-walled functionally graded beams using artificial neural networks 基于人工神经网络的薄壁功能梯度梁非均匀六边形截面分析

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2021-01-01 DOI: 10.31814/stce.nuce2021-15(3)-01

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

引用次数: 1

Evaluation of punching shear capacity of two-way RC slabs without transverse reinforcement according to different provisions 不同规定下无横向配筋双向RC板冲剪承载力评价

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2021-01-01 DOI: 10.31814/stce.nuce2021-15(3)-14

Tran Xuan Vinh, N. Hieu, Pham Xuan Dat, N. M. Hung

引用次数: 1

An effective high-order element for analysis of two-dimensional linear problem using SBFEM 用SBFEM分析二维线性问题的有效高阶单元

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2021-01-01 DOI: 10.31814/stce.nuce2021-15(3)-09

N. V. Chúng, Nguyễn Thanh Him, Bui Quoc Khiem, Pham Ngoc Tien

{"title":"An effective high-order element for analysis of two-dimensional linear problem using SBFEM","authors":"N. V. Chúng, Nguyễn Thanh Him, Bui Quoc Khiem, Pham Ngoc Tien","doi":"10.31814/stce.nuce2021-15(3)-09","DOIUrl":"https://doi.org/10.31814/stce.nuce2021-15(3)-09","url":null,"abstract":"The scaled boundary finite element method (SBFEM) is a semi-analytical method, whose versatility, accuracy, and efficiency are not only equal to, but potentially better than the finite element method and the boundary element method for certain problems. This paper investigates the possibility of using an efficient high-order polynomial element in the SBFEM to form the approximation in the circumferential direction. The governing equations are formulated from the classical linear elasticity theory via the SBFEM technique. The scaled boundary finite element equations are formulated within a general framework integrating the influence of the distributed body source, mixed boundary conditions, contributions the side face with either prescribed surface load or prescribed displacement. The position of scaling center is considered for modeling problem. The proposed method is evaluated by solving two-dimensional linear problem. A selected set of results is reported to demonstrate the accuracy and convergence of the proposed method for solving problems in general boundary conditions.","PeriodicalId":17004,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - NUCE","volume":"54 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81423864","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

Acoustic behavior prediction of monodisperse foams using polynomial surrogates 单分散泡沫声学特性的多项式替代预测

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2021-01-01 DOI: 10.31814/stce.nuce2021-15(3)-13

V. Trinh

引用次数: 0

Shear strength model and prediction of failure mode for multi-spiral column 多螺旋柱抗剪强度模型及破坏模式预测

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2021-01-01 DOI: 10.31814/stce.nuce2021-15(3)-02

Ngo Si Huy, N. N. Tan, M. Hong

引用次数: 0

Possibility of using recycled waste medical-glass as fine aggregate in normal-strength concrete 回收废医用玻璃作为细骨料用于普通强度混凝土的可能性

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2021-01-01 DOI: 10.31814/stce.nuce2021-15(3)-08

Huynh Thi Hoang Dung, H. V. Hiep, H. T. Phuoc

{"title":"Possibility of using recycled waste medical-glass as fine aggregate in normal-strength concrete","authors":"Huynh Thi Hoang Dung, H. V. Hiep, H. T. Phuoc","doi":"10.31814/stce.nuce2021-15(3)-08","DOIUrl":"https://doi.org/10.31814/stce.nuce2021-15(3)-08","url":null,"abstract":"The possibility of using recycled waste medical-glass aggregate (RGA) as a fine aggregate in the production of normal-strength concrete was investigated in this study. The influence of RGA as crushed sand (CS) replacement at different levels (by volume) of 0 – 100% (an interval of 20%) on the engineering properties and durability of concrete was also studied. Results show that the replacement of CS by RGA insignificantly affected the workability and unit weight of fresh concrete mixtures. Besides, using RGA to replace 20 – 60% CS was beneficial in terms of compressive strength, drying shrinkage, and ultrasonic pulse velocity (UPV). At these replacement levels, the dry density values were found to increase and the water absorption values were reduced as well. However, replacing CS with RGA up to 80% and 100% caused a reduction in compressive strength, dry density, and UPV and an increase in water absorption and drying shrinkage of concretes. Closed correlations among the above-mentioned concrete properties were also found in this study. All of the concrete samples obtained compressive strength values higher than the target strength (≥ 25 MPa) and they were classified as very good quality concretes with UPV values of above 4100 m/s. The experimental results demonstrate a high possibility of producing normal-strength concrete with a fine aggregate of RGA as either partially or fully replacement of CS. This also provides an environmentally-friendly solution for recycling waste medical glass in construction materials for sustainable development.","PeriodicalId":17004,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - NUCE","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79257474","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

Effect of uniform temperature load on design of long reinforced concrete structures without expansion joints 均温荷载对无伸缩缝长钢筋混凝土结构设计的影响

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2021-01-01 DOI: 10.31814/stce.nuce2021-15(3)-06

Pham Thai Hoan, N. Tuan

{"title":"Effect of uniform temperature load on design of long reinforced concrete structures without expansion joints","authors":"Pham Thai Hoan, N. Tuan","doi":"10.31814/stce.nuce2021-15(3)-06","DOIUrl":"https://doi.org/10.31814/stce.nuce2021-15(3)-06","url":null,"abstract":"This study presents an investigation on the design of long reinforced concrete (RC) structures subjected to uniform temperature load by considering three RC frame building models with different lengths of 45 m, 135 m, and 270 m using Etabs. The uniform temperature load is considered being the change from the annual average highest to lowest air temperature at the construction site in the case of unavailable temperature data of concrete. The analysis results indicate that the uniform temperature load mainly influences on the internal forces of RC members at storey 1 and slightly effects on the internal forces of RC members at storey 2. For short-length RC structures, the effect of temperature load can be ignored in the design of RC elements, whereas it must be taken into account in design of slab, beams and some column positions at storey 1 of medium-length and long RC structures without expansion joints. For the present RC frame building models, the required slab reinforcement in long direction increases about 33.4% for medium-length RC structures (135 m) and about 48.2% for long RC structures (270 m) without expansion joints. The required reinforcement for positive moment at mid-span increases from 33.7 to 39.4%, whereas the total required reinforcement for negative moment at the supports of beams increases from 19.4 to 34.9% in long direction of 270 m long RC structures without expansion joints due to uniform temperature load. Column design of long RC structures without expansion joints under uniform temperature load must be concerned, especially for columns in the corners.","PeriodicalId":17004,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - NUCE","volume":"174 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76040293","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

Effect of loading rate on flexural behavior of concrete and reinforced concrete beams 加载速率对混凝土和钢筋混凝土梁受弯性能的影响

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2021-01-01 DOI: 10.31814/stce.nuce2021-15(3)-11

N. Hieu, N. Tuan

引用次数: 0

Influences of shrinkage reducing admixture on the mechanical properties, drying shrinkage, water absorption and porosity of Portland cement mortar 减缩掺合料对硅酸盐水泥砂浆力学性能、干收缩率、吸水率和孔隙率的影响

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2021-01-01 DOI: 10.31814/stce.nuce2021-15(3)-05

N. Chính

{"title":"Influences of shrinkage reducing admixture on the mechanical properties, drying shrinkage, water absorption and porosity of Portland cement mortar","authors":"N. Chính","doi":"10.31814/stce.nuce2021-15(3)-05","DOIUrl":"https://doi.org/10.31814/stce.nuce2021-15(3)-05","url":null,"abstract":"Drying shrinkage is the main cause of early age cracking of concrete and mortar. A wide range of research has been conducted to reduce the drying shrinkage, including using fibres or chemical admixtures. This paper investigated the effect of shrinkage reducing admixture on the flexural strength, compressive strength, drying shrinkage, water absorption and porosity of mortar. The mix compositions were ordinary Portland cement (OPC) : sand : liquid = 1: 1: 0.38 in which liquid consisted of water and shrinkage reducing admixture (SRA). SRA was used at the proportions of 2%, 4%, and 7% by weight of cement. The test results show that SRA reduces the flexural and compressive strengths of mortar. The reduction in flexural strength and compressive strength at 28 days is 14% and 25%, respectively at 7% SRA dosage. In addition, SRA significantly reduces the drying shrinkage and water absorption of mortar. At 7% SRA dosage, the drying shrinkage at 53 days is reduced by 60% while the water absorption rate at 24 hours is reduced by 54%. However, SRA has a minor effect on the pore size distribution, effective porosity, and cumulative intrusion volume of mortar.","PeriodicalId":17004,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - NUCE","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88917975","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