Steel and Composite Structures最新文献_第5页

On the mechanics of nanocomposites reinforced by wavy/defected/aggregated nanotubes 波状/缺陷/聚集纳米管增强纳米复合材料的力学研究

IF 4.6 3区工程技术

Steel and Composite Structures Pub Date : 2021-01-01 DOI: 10.12989/SCS.2021.38.5.533

Farshad Heidari, Keivan Taheri, Mehrdad Sheybani, M. Janghorban, A. Tounsi

{"title":"On the mechanics of nanocomposites reinforced by wavy/defected/aggregated nanotubes","authors":"Farshad Heidari, Keivan Taheri, Mehrdad Sheybani, M. Janghorban, A. Tounsi","doi":"10.12989/SCS.2021.38.5.533","DOIUrl":"https://doi.org/10.12989/SCS.2021.38.5.533","url":null,"abstract":"What is desirable in engineering is to bring the engineering model as close to reality as possible while the simplicity of model is also considered. In recent years, several studies have been performed on nanocomposites but some of these studies are somewhat far from reality. For example, in many of these studies, the carbon nanotubes (CNTs) are assumed completely straight, flawless and uniformly distributed throughout the matrix but by studying nanocomposites, we find that this is not the case. In this paper, three steps have been taken to bring the presented models for nanocomposites closer to reality. One is that assuming the straightness of nanotubes is removed and the waviness is considered. Also, the nanotubes are not considered to be pristine and the influence of defect is included in accordance with reality. In addition, the approximation of uniform distribution of nanotubes is ignored and according to experimental observations, the effect of nanotube aggregation is considered. As far as we know, this is the first study on these three topics together in an article. Moreover, we also include the size effects in our models for nanocomposites. To show the accuracy of our models, our results are calibrated with experimental results and compared with theoretical model. For numerical examples, we present the buckling behaviors of nanocomposites including the size effects using nonlocal theory and compare the results of our models with the results of models with above-mentioned approximations.","PeriodicalId":51177,"journal":{"name":"Steel and Composite Structures","volume":"38 1","pages":"533-545"},"PeriodicalIF":4.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66590476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 60

Transient memory response of a thermoelectric half-space with temperature-dependent thermal conductivity and exponentially graded modulii 热电半空间的瞬态记忆响应与温度相关的热导率和指数梯度模量

IF 4.6 3区工程技术

Steel and Composite Structures Pub Date : 2021-01-01 DOI: 10.12989/SCS.2021.38.4.447

M. Ezzat

引用次数: 1

Experimental and numerical investigation on post-earthquake fire behaviour of the circular concrete-filled steel tube columns 圆形钢管混凝土柱震后防火性能的试验与数值研究

IF 4.6 3区工程技术

Steel and Composite Structures Pub Date : 2021-01-01 DOI: 10.12989/SCS.2021.38.1.017

Yu-Hang Wang, Q. Tang, M. Su, Ji-Ke Tan, Weiyong Wang, Yong-Sen Lan, Xiaowei Deng, Y. Bai, W. Luo, Xiaohong Li, Jiulin Bai

{"title":"Experimental and numerical investigation on post-earthquake fire behaviour of the circular concrete-filled steel tube columns","authors":"Yu-Hang Wang, Q. Tang, M. Su, Ji-Ke Tan, Weiyong Wang, Yong-Sen Lan, Xiaowei Deng, Y. Bai, W. Luo, Xiaohong Li, Jiulin Bai","doi":"10.12989/SCS.2021.38.1.017","DOIUrl":"https://doi.org/10.12989/SCS.2021.38.1.017","url":null,"abstract":"Post-earthquake fire is a common disaster which causes serious safety issues to infrastructures. This study aims to investigate the residual loading capacities of circular concrete-filled steel tube (CFST) columns under post-earthquake fire experimentally and numerically. The experimental programme contains two loading steps - pre-damage cyclic loading at room temperature and transient state tests with constant compression loads. Three finite element models are developed and validated against the test results. Upon validation, a total of 48 numerical results were generated in the parametric study to investigate the effects of thickness and strengths of steel tube, axial compression ratio and damage degree on the fire resistance of circular CFST columns. Based on the analysis on experimental and numerical results, the loading mechanism of circular CFST columns is discussed. A design method is proposed for the prediction of fire resistance time under different seismic pre-damage and compression loads. The predictions by the new method is compared with the newly generated experimental and numerical results and is found to be accurate and consistent with the mean value close to the unity and a coefficient of variation around 1%.","PeriodicalId":51177,"journal":{"name":"Steel and Composite Structures","volume":"38 1","pages":"17-31"},"PeriodicalIF":4.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66588468","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Plastic analysis of steel arches and framed structures with various cross sections 不同截面钢拱和框架结构的塑性分析

IF 4.6 3区工程技术

Steel and Composite Structures Pub Date : 2021-01-01 DOI: 10.12989/SCS.2021.38.3.257

Jéssica Lorrany e Silva, Lidiane R. R. M. Deus, Í. Lemes, R. Silveira

引用次数: 3

Research on shear distribution of perfobond connector groups with rubber rings 带橡胶环的全粘接接头组剪切分布研究

IF 4.6 3区工程技术

Steel and Composite Structures Pub Date : 2021-01-01 DOI: 10.12989/SCS.2021.38.4.399

Yangqing Liu, H. Xin, Yuqing Liu

引用次数: 0

Optimized stiffener detailing for shear links in eccentrically braced frames 优化加劲详述剪切链接在偏心支撑框架

IF 4.6 3区工程技术

Steel and Composite Structures Pub Date : 2021-01-01 DOI: 10.12989/SCS.2021.39.1.035

Y. Özkılıç

引用次数: 11

An approach for partial strengthening of circular RC columns using outer steel tube 钢筋混凝土圆形柱外筒局部加固方法研究

IF 4.6 3区工程技术

Steel and Composite Structures Pub Date : 2021-01-01 DOI: 10.12989/SCS.2021.38.6.739

Ju-young Hwang, H. Kwak

{"title":"An approach for partial strengthening of circular RC columns using outer steel tube","authors":"Ju-young Hwang, H. Kwak","doi":"10.12989/SCS.2021.38.6.739","DOIUrl":"https://doi.org/10.12989/SCS.2021.38.6.739","url":null,"abstract":"This paper introduces an improved design equation to evaluate the resisting capacity of circular reinforced concrete (RC) columns partially strengthened with outer steel tube. When RC column members are required to be strengthened according to the change in the loadings considered and/or the deterioration progress in columns, wrapping up RC column with steel circular tube, which takes the form of concrete filled steel tube (CFST), has been popularly considered because of its structural advantage induced from the confinement effect. However, the relatively high construction cost of steel tube is restricting its use to the required region, while deriving the shape of a partial CFST column. To evaluate the resisting capacity of a partial CFST column, numerical analyses need to be performed, and a numerical model proposed in the previous study for the numerical analysis of full CFST columns is used to conduct parametric studies for the introduction of a design equation. The bond-slip effect developed along the interface between the in-filled concrete and the exterior steel tube is taken into consideration and the validity of the numerical model has been established through correlation studies between experimental data and numerical results for partial CFST circular columns. Moreover, parametric studies make it possible to introduce a design equation for determining the optimum length of outer steel tube which produces partial CFST circular columns.","PeriodicalId":51177,"journal":{"name":"Steel and Composite Structures","volume":"38 1","pages":"739"},"PeriodicalIF":4.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66591011","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Predicting the splitting tensile strength of concrete using an equilibrium optimization model 用平衡优化模型预测混凝土劈裂抗拉强度

IF 4.6 3区工程技术

Steel and Composite Structures Pub Date : 2021-01-01 DOI: 10.12989/SCS.2021.39.1.081

Yinghao Zhao, X. Zhong, L. K. Foong

{"title":"Predicting the splitting tensile strength of concrete using an equilibrium optimization model","authors":"Yinghao Zhao, X. Zhong, L. K. Foong","doi":"10.12989/SCS.2021.39.1.081","DOIUrl":"https://doi.org/10.12989/SCS.2021.39.1.081","url":null,"abstract":"Splitting tensile strength (STS) is an important mechanical parameter of concrete. This study offers novel methodologies for the early prediction of this parameter. Artificial neural network (ANN), which is a leading predictive method, is synthesized with two metaheuristic algorithms, namely atom search optimization (ASO) and equilibrium optimizer (EO) to achieve an optimal tuning of the weights and biases. The models are applied to data collected from the published literature. The sensitivity of the ASO and EO to the population size is first investigated, and then, proper configurations of the ASO-NN and EO-NN are compared to the conventional ANN. Evaluating the prediction results revealed the excellent efficiency of EO in optimizing the ANN. Accuracy improvements attained by this algorithm were 13.26 and 11.41% in terms of root mean square error and mean absolute error, respectively. Moreover, it raised the correlation from 0.89958 to 0.92722. This is while the results of the conventional ANN were slightly better than ASO-NN. The EO was also a faster optimizer than ASO. Based on these findings, the combination of the ANN and EO can be an efficient non-destructive tool for predicting the STS.","PeriodicalId":51177,"journal":{"name":"Steel and Composite Structures","volume":"39 1","pages":"81"},"PeriodicalIF":4.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66591255","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 41

Numerical investigation on the flexural links of eccentrically braced frames with web openings 带腹板开口偏心支撑框架弯曲连接的数值研究

IF 4.6 3区工程技术

Steel and Composite Structures Pub Date : 2021-01-01 DOI: 10.12989/SCS.2021.39.2.171

S. Erfani, A. Vakili, Vahid Akrami

引用次数: 0

Elastic stiffness of stud connection in composite structures 复合结构中螺柱连接的弹性刚度

IF 4.6 3区工程技术

Steel and Composite Structures Pub Date : 2021-01-01 DOI: 10.12989/SCS.2021.39.4.419

X. Qin, Guotao Yang

{"title":"Elastic stiffness of stud connection in composite structures","authors":"X. Qin, Guotao Yang","doi":"10.12989/SCS.2021.39.4.419","DOIUrl":"https://doi.org/10.12989/SCS.2021.39.4.419","url":null,"abstract":"In composite structures, shear connectors are crucial components to resist the relative slip between the steel and concrete, and thereby to achieve the composite actions. In the service stage, composite structures are usually in elastic state, so the elastic stiffness of the shear connection is a quite important parameter in the structural analysis of composite structures. Nevertheless, the existing studies mainly focus on the load-slip relationship rather than the tangent stiffness at the initial elastic stage. Furthermore, when composite beams subjected to torque or local load, shear connections are affected by both tensile force and shear force. However, the stiffness of shear connections under combined effects appears not to have been discussed hitherto. This paper investigates the initial elastic stiffness of stud connections under combined effects of biaxial forces. The initial expression and the relevant parameters are obtained by establishing a simplified analytical model of the stud connection. Afterwards, parametric finite element analysis is performed to investigate the effects of the relevant factors, including the stud length, stud diameter, elastic modulus of concrete, elastic modulus of steel and volume ratio of reinforcement. The feasibility of the proposed modelling has been proved by comparing with sufficient experimental tests. Based on the analytical analysis and the extensive numerical simulations, design equations for predicting the initial elastic stiffness of stud connections are proposed. The comparison between the equations and the data of finite element models demonstrates that the equations are accurate enough to serve for engineering communities.","PeriodicalId":51177,"journal":{"name":"Steel and Composite Structures","volume":"39 1","pages":"419"},"PeriodicalIF":4.6,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66592195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1