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

Static analysis of piezoelectric functionally graded porous plates reinforced by graphene platelets 石墨烯片增强压电功能梯度多孔板的静力分析

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-08-31 DOI: 10.31814/stce.nuce2019-13(3)-06

N. Lieu, N. Hung

{"title":"Static analysis of piezoelectric functionally graded porous plates reinforced by graphene platelets","authors":"N. Lieu, N. Hung","doi":"10.31814/stce.nuce2019-13(3)-06","DOIUrl":"https://doi.org/10.31814/stce.nuce2019-13(3)-06","url":null,"abstract":"In this study, for the first time an isogeometric finite element formulation for bending analysis of functionally graded porous (FGP) plates reinforced by graphene platelets (GPLs) embedded in piezoelectric layers is presented. It is named as PFGP-GPLs for a short. The plates are constituted by a core layer, which contains the internal pores and GPLs dispersed in the metal matrix either uniformly or non-uniformly according to three different patterns, and two piezoelectric layers perfectly bonded on the top and bottom surfaces of host plate. The modified Halpin–Tsai micromechanical model is used to estimate the effective mechanical properties which vary continuously along thickness direction of the core layer. In addition, the electric potential is assumed to vary linearly through the thickness for each piezoelectric sublayer. A generalized C0-type higher-order shear deformation theory (C0-HSDT) in association with isogeometric analysis (IGA) is investigated. The effects of weight fractions and dispersion patterns of GPLs, the coefficient and distribution types of porosity as well as external electrical voltages on structure’s behaviors are investigated through several numerical examples. \u0000Keywords: \u0000piezoelectric materials; FG-porous plate; graphene platelet reinforcements; isogeometric analysis.","PeriodicalId":17004,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - NUCE","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87166748","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

Effects of vertical seismic actions on the responses of single-storey industrial steel building frames 竖向地震作用对单层工业钢结构框架反应的影响

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-08-31 DOI: 10.31814/stce.nuce2019-13(3)-07

Dinh Van Thuat, Nguyen Dinh Hoa, H. Chuong, Truong Viet Hung

{"title":"Effects of vertical seismic actions on the responses of single-storey industrial steel building frames","authors":"Dinh Van Thuat, Nguyen Dinh Hoa, H. Chuong, Truong Viet Hung","doi":"10.31814/stce.nuce2019-13(3)-07","DOIUrl":"https://doi.org/10.31814/stce.nuce2019-13(3)-07","url":null,"abstract":"Single-storey industrial steel frames with crances are considered as being vertically irregular in structural configuration and load distribution under strong earthquake excitations. In this paper, various analytical frames with their spans of 20, 26, 32 and 38 m and locations built in Ha Noi and Son La regions were designed to resist dead, roof live, crane and wind loads. The equivalent horizontal and vertical static earthquake loads applied on the frames were determined. Next, by using linear elastic analyses of structures, the effects of vertical seismic actions on the responses of the frames were evaluated in terms of the ratios K1 and K2 at the bottom and top of the columns corresponding to different combinations of dead loads and static earthquake loads, as denoted by CE1, CE2 and CE3. The effects of seismic actions compared with those of wind actions were also evaluated in terms of the ratios K3 and K4. As a result, the effects of vertical seismic actions were significant and increased with the span lengths of the frames. In addition, by using nonlinear inelastic analyses of structures, the levels of the static earthquake loads were determined corresponding to the first yielding and maximum resistances of the frames. \u0000Keywords: \u0000single-storey industrial buildings; steel frames; span lengths; irregularity; vertical seismic actions; earthquake levels; wind loads","PeriodicalId":17004,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - NUCE","volume":"68 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73340392","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: 5

Effect of fly ash on shrinkage of self-compacting concrete using restrained ring test 粉煤灰对自密实混凝土收缩影响的约束环试验

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-08-31 DOI: 10.31814/stce.nuce2019-13(3)-03

T. Mien, Nguyễn Hoàng Phúc, C. T. Yen

{"title":"Effect of fly ash on shrinkage of self-compacting concrete using restrained ring test","authors":"T. Mien, Nguyễn Hoàng Phúc, C. T. Yen","doi":"10.31814/stce.nuce2019-13(3)-03","DOIUrl":"https://doi.org/10.31814/stce.nuce2019-13(3)-03","url":null,"abstract":"In recent years, fly ash (FA) has been increasingly used widespread like a mineral admixture for the production of concrete in general and self-compacting concrete (SCC) in particular. Fly ash is an industrial by-product and is generated during the combustion of coal for energy production from the thermal power station. Fly ash is utilized to increase the workability of concrete mixtures and increase shrinkage resistance of the self-compacting concrete. In this paper, the mixture design of the self-compacting concrete with strength grade of 60 MPa is performed with requirement that the workability satisfies the slump flow, T500 and the V-Funnel TV test range from 650 to 800 mm, from 2 to 5 s and from 6 to 12 s, respectively. Besides, fly ash is used to replace cement with content of 15%, 25%, 35% and 50% to evaluate shrinkage resistance. The obtained results showed that using fly ash contents from 25% to 35% to replace cement can ensure workability of the mixture together with high degree of shrinkage restraint. According to ASTM C1581, the evaluation of restrained shrinkage of the self-compacting concrete based on the restrained ring test, this method reduces the testing time but still ensure the reliability. \u0000Keywords: \u0000fly ash; self-compacting concrete; shrinkage resistance; restrained ring test.","PeriodicalId":17004,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - NUCE","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73728893","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

Static analysis of Reissner-Mindlin plates using ES+NS-MITC3 elements 利用ES+NS-MITC3单元对Reissner-Mindlin板进行静力分析

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-08-31 DOI: 10.31814/stce.nuce2019-13(3)-05

Chau-Dinh Thanh, H. Con, Le Phuong Binh

引用次数: 2

Scaled boundary finite element method with circular defining curve for geo-mechanics applications 具有圆形定义曲线的尺度边界有限元法在地球力学中的应用

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-08-31 DOI: 10.31814/stce.nuce2019-13(3)-12

N. V. Chung

引用次数: 2

Indentation for investigation of strain rate effect on mechanical properties in structural steel weld zone 压痕研究应变速率对结构钢焊接区力学性能的影响

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-08-31 DOI: 10.31814/stce.nuce2019-13(3)-10

Pham Thai Hoan, Nguyễn Ngọc Vinh, Nguyen Thi Thanh Tung

引用次数: 6

Weight optimisation of functionally graded beams using modified differential evolution 使用改进差分演化的功能梯度梁的重量优化

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-04-30 DOI: 10.31814/STCE.NUCE2019-13(2)-05

P. H. Anh, T. Dương

引用次数: 4

Large displacement elastic static analysis of semi-rigid planar steel frames by corotational Euler--Bernoulli finite element 基于欧拉-伯努利有限元的半刚性平面钢框架大位移弹性静力分析

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-04-30 DOI: 10.31814/STCE.NUCE2019-13(2)-03

N. Hải, L. Binh, Doan Ngoc Tinh Nghiem, Ngo-Huu Cuong

{"title":"Large displacement elastic static analysis of semi-rigid planar steel frames by corotational Euler--Bernoulli finite element","authors":"N. Hải, L. Binh, Doan Ngoc Tinh Nghiem, Ngo-Huu Cuong","doi":"10.31814/STCE.NUCE2019-13(2)-03","DOIUrl":"https://doi.org/10.31814/STCE.NUCE2019-13(2)-03","url":null,"abstract":"A corotational finite element for large-displacement elastic analysis of semi-rigid planar steel frames is proposed in this paper. Two zero-length rotational springs are attached to the ends of the Euler-Bernoulli element formulated in corotational context to simulate the flexibility of the beam-to-column connections and then the equilibrium equations of the hybrid element, including the stiffness matrix which contains the stiffness terms of the rotational springs, are established based on the static condensation procedure. The linear and Kishi-Chen three-parameter power models are applied in modelling the moment-rotation relation of beam-column connections. The arc-length nonlinear algorithm combined with the sign of displacement internal product are used to predict the equilibrium paths of the system under static load. The analysis results are compared to previous studies to verify the accuracy and effectiveness of the proposed element and the applied nonlinear procedure. \u0000Keywords: corotational context; Euler-Bernoulli element; large displacement; semi-rigid connection; steel frame; static analysis.","PeriodicalId":17004,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - NUCE","volume":"124 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74632450","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: 6

Study on producing light weight concrete with foam glass granules 泡沫玻璃颗粒生产轻质混凝土的研究

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-04-30 DOI: 10.31814/STCE.NUCE2019-13(2)-07

Hoang Vinh Long

引用次数: 2

Application of Hilbert Huang transform to identify the natural frequencies of steel frame 应用希尔伯特黄变换识别钢框架的固有频率

Journal of Science and Technology in Civil Engineering (STCE) - NUCE Pub Date : 2019-04-30 DOI: 10.31814/STCE.NUCE2019-13(2)-06

N. Trung

{"title":"Application of Hilbert Huang transform to identify the natural frequencies of steel frame","authors":"N. Trung","doi":"10.31814/STCE.NUCE2019-13(2)-06","DOIUrl":"https://doi.org/10.31814/STCE.NUCE2019-13(2)-06","url":null,"abstract":"Identification of dynamic structural characteristics such as natural frequency based on measured vibration responses at site is one of the important steps in the structural investigation work of loading test and structural health monitoring. During the service stage, the dynamic characteristics can be changed due to the stiffness reduction and nonlinear of structure under extrema excitation. Therefore, the identification of instantaneous parameters of structure is very necessary in detecting and monitoring the structural deterioration continuously by the time. This paper presents the data processing method using Hilbert Huang Transform (HHT) algorithm in determining a time-dependent frequencies of steel frame. The vibration experiment for steel frame was conducted in this study. The acceleration responses in time domain were recorded and analyzed by HTT to determine the fundamental natural frequencies of frame. The instantaneous frequencies in the time domain of steel frame are the main finding in this research. The traditional data processing method using a Fast Fourier Transform (FFT) was conducted and compared with the HHT method. \u0000Keywords: Hilbert Huang Transform (HHT); steel frame; Fast Fourier Transform (FFT); natural frequency.","PeriodicalId":17004,"journal":{"name":"Journal of Science and Technology in Civil Engineering (STCE) - NUCE","volume":"69 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77273751","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