Journal of Science and Technology in Civil Engineering (STCE) - HUCE最新文献_第7页

Numerical scheme for transient seepage analysis under unsaturated conditions 非饱和条件下瞬态渗流分析数值格式

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2022-01-26 DOI: 10.31814/stce.huce(nuce)2022-16(1)-08

Pham Nguyen Nhat Khanh, N. H. Nghia

{"title":"Numerical scheme for transient seepage analysis under unsaturated conditions","authors":"Pham Nguyen Nhat Khanh, N. H. Nghia","doi":"10.31814/stce.huce(nuce)2022-16(1)-08","DOIUrl":"https://doi.org/10.31814/stce.huce(nuce)2022-16(1)-08","url":null,"abstract":"Unsaturated soil behaviors characterize the failure mechanisms of geotechnical infrastructures with transient seepage conditions. Therefore, an accurate estimate of the unsaturated groundwater flow is vital in improving hazard management and assessment. This study attempts to develop a numerical scheme for 2-D transient analysis under unsaturated conditions. First, the unsaturated groundwater flow was described using the mass conservation law. Then, the Finite Difference Method and Backward Euler approximation were applied for space and time discretization, respectively. Furthermore, the simple Picard iteration was applied to linearize the governing equation. The reliability of the presented method was verified with the analytical solution. The evaluation results demonstrated the sufficiency of the proposed method, quantitatively expressed by the maximum error of 0.04% for opened boundary conditions and 0.15% for closed boundary conditions. The significant advantage of the proposed method is the flexibility with various soil-water characteristic curve models and associated hydraulic conductivity functions, which helps to improve the applicability in practice.","PeriodicalId":387908,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - HUCE","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122768907","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

Influence of artificial lightweight aggregate on property modification of unfired brick with low energy super-sulfated cement 人造轻骨料对低能超硫酸盐水泥未烧结砖性能改性的影响

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2022-01-26 DOI: 10.31814/stce.huce(nuce)2022-16(1)-11

Hoang-Anh Nguyen, Vu-An Tran

{"title":"Influence of artificial lightweight aggregate on property modification of unfired brick with low energy super-sulfated cement","authors":"Hoang-Anh Nguyen, Vu-An Tran","doi":"10.31814/stce.huce(nuce)2022-16(1)-11","DOIUrl":"https://doi.org/10.31814/stce.huce(nuce)2022-16(1)-11","url":null,"abstract":"Rapid increase in concrete demand for infrastructural construction has been associated with depletion of natural resources, leading the urgent need to utilize manufactured materials substituting natural materials in concrete productions. This study proposes applying cold-bonded low calcium Class F fly ash (FFA) based artificial lightweight aggregate (ALWA) to partially replace natural fine aggregate in an ecological unfired brick with a low energy super-sulfated cement (SSC). To estimate the influence of ALWA on the brick properties, natural fine aggregate (FA) in the reference brick was substituted with ALWA at four different amounts of 25, 50, 75 and 100% by volume. Various properties including unit weight, flowability, dried density, compressive strength, water absorption, and drying shrinkage were investigated. Experimental results showed that ALWA addition as partial replacement of FA at all ratios resulted in the modified bricks with significantly increase in flowability and decreases in both unit weight and dried density. With neglecting minor reduction on compressive strength, the 75% ALWA substituting FA by volume was considered as the optimum value to manufacture the modified unfired bricks with remarkable enhanced performance.","PeriodicalId":387908,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - HUCE","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131826316","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

Vibration characteristics of rotating functionally graded porous beams reinforced by graphene platelets 石墨烯片增强旋转功能梯度多孔梁的振动特性

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2021-10-31 DOI: 10.31814/stce.huce(nuce)2021-15(4)-03

C. T. Binh, Tran Huu Quoc, Duong Thanh Huan, H. Hien

引用次数: 2

Evaluation of modulus of elasticity for eco-friendly concrete made with seawater and marine sand 海水与海砂环保混凝土的弹性模量评价

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2021-10-31 DOI: 10.31814/stce.huce(nuce)2021-15(4)-13

T. Nguyen, P. Tung, K. Hossain

{"title":"Evaluation of modulus of elasticity for eco-friendly concrete made with seawater and marine sand","authors":"T. Nguyen, P. Tung, K. Hossain","doi":"10.31814/stce.huce(nuce)2021-15(4)-13","DOIUrl":"https://doi.org/10.31814/stce.huce(nuce)2021-15(4)-13","url":null,"abstract":"The ultimate aim of this study is to use experimental work for evaluating the modulus of elasticity (MOE) of Geopolymer concrete (GPC) using marine sand as fine aggregate and seawater for the mix. Four different groups of concrete mixtures, namely CP1a, CP1b, CP2a, CP2b were identified. While the CP1a mix was prepared using GPC with marine sand and seawater, the CP1b was made by adding sodium sulfate (Na2SO4) into the CP1a mix. The same procedure was applied for CP2a and CP2b mixtures; however, instead of using GPC, Portland Cement was used as the binder for the CP2 group (OPC). A total of 12 test samples were cast and tested to determine the development of MOE of GPC and OPC over time. The MOE of concrete was measured at 3, 7, 28, 60, and 120 days. Experimental results were then compared to the MOE obtained using the empirical equation from ACI 318 - 2008. It was found that the experimental MOE of both OPC and GPC specimens was higher than the estimated MOE values from ACI standards. The added sodium sulfate yielded a significant effect on the MOE of OPC but produced a minimal influence on the MOE of GPC.","PeriodicalId":387908,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - HUCE","volume":"24 59","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113962561","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

Rayleigh waves in compressible orthotropic half-space overlaid by a thin un-coaxial orthotropic layer 可压缩正交各向异性半空间中的瑞利波，由薄的非同轴正交各向异性层覆盖

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2021-10-31 DOI: 10.31814/stce.huce(nuce)2021-15(4)-05

T. T. Hue, Phan Thi Hoai Phuong, P. H. Anh

引用次数: 0

Calculation of reinforced concrete beams’ shear strengths at ambient and fire conditions according to Russian design standards 根据俄罗斯设计标准计算环境和火灾条件下钢筋混凝土梁的抗剪强度

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2021-10-31 DOI: 10.31814/stce.huce(nuce)2021-15(4)-14

N. Thang, N. Kien

{"title":"Calculation of reinforced concrete beams’ shear strengths at ambient and fire conditions according to Russian design standards","authors":"N. Thang, N. Kien","doi":"10.31814/stce.huce(nuce)2021-15(4)-14","DOIUrl":"https://doi.org/10.31814/stce.huce(nuce)2021-15(4)-14","url":null,"abstract":"This paper introduces general principles and gives analytical clarifications of the stirrups design at ambient condition and shear strength analysis for reinforced concrete (RC) beams at fire condition according to Russian design standards SP 63.13330.2012 (SP 63) and SP 468.1325800.2019 (SP 468), respectively. The calculation method on inclined cross section (ISC) and the simplified approach on normal cross section (NSC) are clarified and developed so that the stirrups configuration can be directly designed at ambient condition and the deterioration of shear strength when the beam is exposed to ISO 834 fire can also be explicitly determined. Calculation results of a case study conducted in the paper show that although there are certain gaps between the designed results of stirrups using ICS and NCS methods, the fire resistances based on shear strength criteria obtained from the two methods are similar. With the systematic nature between the design standards TCVN 5574:2018, SP 63 and SP 468, it is rational to use SP 468 as a reference for RC structural fire design that is compatible with QCVN 06:2021/BXD and TCVN 5574:2018, before any advanced international code is decided to be applied in Vietnam.","PeriodicalId":387908,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - HUCE","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115621981","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

Finite element modelling of rectangular concrete-filled steel tube stub columns incorporating high strength and ultra-high strength materials under concentric axial compression 同心圆轴压作用下高强和超高强材料矩形钢管混凝土短柱的有限元模拟

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2021-10-31 DOI: 10.31814/stce.huce(nuce)2021-15(4)-07

T. Son, Cuong Ngo-Huu, Dinh Van Thuat

{"title":"Finite element modelling of rectangular concrete-filled steel tube stub columns incorporating high strength and ultra-high strength materials under concentric axial compression","authors":"T. Son, Cuong Ngo-Huu, Dinh Van Thuat","doi":"10.31814/stce.huce(nuce)2021-15(4)-07","DOIUrl":"https://doi.org/10.31814/stce.huce(nuce)2021-15(4)-07","url":null,"abstract":"This study presents a unified approach to simulate the behavior of rectangular concrete-filled steel stub columns incorporating high strength and ultra-high strength materials subjected to concentric axial compression. The finite element model is developed based on Abaqus software, which is capable of accounting for geometrical nonlinearity, material plasticity, and interaction between multi-physics. The proposed model incorporates the influences of residual stress for welded-box steel sections and initial imperfection. A novel stress-strain relation of confined concrete is proposed to account for the composite action, which might increase the strength and ductility of infilled concrete under multi-axial compressive conditions. Various verification examples are conducted with wide ranges of geometrical and material properties. The simulation results show that the proposed model can accurately predict the ultimate strength, load-deformation relations, and failure mode of the experimental specimens.","PeriodicalId":387908,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - HUCE","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131241617","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

A new type of hollow-shallow steel and concrete composite floor beam 一种新型空心-浅钢-混凝土组合楼板梁

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2021-10-31 DOI: 10.31814/stce.huce(nuce)2021-15(4)-06

V. Tuan, Han Ngoc Duc, Nguyen Dinh Hoa, N. Hieu, N. Kien

引用次数: 0

Local buckling of thin-walled circular hollow section under uniform bending 薄壁圆空心截面在均匀弯曲作用下的局部屈曲

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2021-10-31 DOI: 10.31814/stce.huce(nuce)2021-15(4)-08

B. H. Cuong

引用次数: 0

Coupled finite-discrete element modeling and potential applications in civil engineering 耦合有限-离散元建模及其在土木工程中的潜在应用

Journal of Science and Technology in Civil Engineering (STCE) - HUCE Pub Date : 2021-10-31 DOI: 10.31814/stce.huce(nuce)2021-15(4)-10

N. Kien, V. T. Trung, Nguyen Nhu Hoang

{"title":"Coupled finite-discrete element modeling and potential applications in civil engineering","authors":"N. Kien, V. T. Trung, Nguyen Nhu Hoang","doi":"10.31814/stce.huce(nuce)2021-15(4)-10","DOIUrl":"https://doi.org/10.31814/stce.huce(nuce)2021-15(4)-10","url":null,"abstract":"Since its appearance at the last of seventy decades, the Discrete Element Modeling (DEM) has been widely used in the modeling of geomaterials but regrettably limited to small scales problems by considering grains interactions. Recently, a new trend has emerged in combining DEM with other methods. The coupled approach allows extending the methods toward a wide range of civil engineering applications. Among them, FEM×DEM coupling has been the topic of research over the past decade. The FEM×DEM coupling has been mainly developed in two categories: direct interaction and multi-scale coupled models. In the first regard, this paper summarizes the basic principle of FEM and DEM, then reviews a number of possible direct coupling strategies between FEM and DEM together with potential applications in civil engineering. The second objective is to develop a model that combines these two above mentioned methods in a multi-scale approach. The results obtained by the developed model have been proved to efficiently tackle the complicated problem in engineering applications by assessing both macro and micro features and establishing the linking information between them.","PeriodicalId":387908,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - HUCE","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122338899","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