Structural Engineering and Mechanics最新文献_第3页

Investigating the effects of span arrangements on DDBD-designed RC buildings under the skew seismic attack 探讨了在斜交地震作用下，跨度布置对ddbd设计的钢筋混凝土建筑的影响

IF 2.2 4区工程技术

Structural Engineering and Mechanics Pub Date : 2021-01-01 DOI: 10.12989/SEM.2021.77.1.115

Dariush Alimohammadi, Esmaeel Izadi Zaman Abadi

{"title":"Investigating the effects of span arrangements on DDBD-designed RC buildings under the skew seismic attack","authors":"Dariush Alimohammadi, Esmaeel Izadi Zaman Abadi","doi":"10.12989/SEM.2021.77.1.115","DOIUrl":"https://doi.org/10.12989/SEM.2021.77.1.115","url":null,"abstract":"This paper focuses on examining the effects of span arrangements on displacement responses of plan-symmetric RC frame buildings designed using the direct displacement-based design (DDBD) method by employing non-linear analyses and the skew seismic attack. In order to show the desired performance of DDBD design approach, the force-based design approach is also used to examine the seismic performance of the selected structures. To realize this objective, 8-story buildings with different plans are selected. In addition, the dynamic behavior of the structures is evaluated by selecting 3, 7, and 12-story buildings. In order to perform non-linear analyses, OpenSees software is used for modeling buildings. Results of an experimental model are used to validate the analytical model implemented in OpenSees. The results of non-linear static and non-linear dynamic analyses indicate that changing span arrangements does not affect estimating the responses of structures designed using the DDBD approach, and the results are more or less the same. Next, in order to apply the earthquake in non-principle directions, DDBD structures, designed for one-way performance, are designed again for two-way performance. Time history analyses are performed under a set of artificial acceleration pairs, applied to structures at different angles. It is found that the mean maximum responses of earthquakes at all angles have very good agreement with the design-acceptable limits, while the response of buildings along the height direction has a relatively acceptable and uniform distribution. Meanwhile, changes in the span arrangements did not have a significant effect on displacement responses.","PeriodicalId":51181,"journal":{"name":"Structural Engineering and Mechanics","volume":"47 1","pages":"115-135"},"PeriodicalIF":2.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66120147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Lifetime seismic performance assessment of high-rise steel-concrete composite frame with buckling-restrained braces under wind-induced fatigue 高层约束屈曲支撑钢-混凝土组合框架在风致疲劳下的寿命抗震性能评价

IF 2.2 4区工程技术

Structural Engineering and Mechanics Pub Date : 2021-01-01 DOI: 10.12989/SEM.2021.77.2.197

Yang Liu, Hongnan Li, Chao Li, Tian-Ze Dong

{"title":"Lifetime seismic performance assessment of high-rise steel-concrete composite frame with buckling-restrained braces under wind-induced fatigue","authors":"Yang Liu, Hongnan Li, Chao Li, Tian-Ze Dong","doi":"10.12989/SEM.2021.77.2.197","DOIUrl":"https://doi.org/10.12989/SEM.2021.77.2.197","url":null,"abstract":"Under a severe environment of multiple hazards such as earthquakes and winds, the life-cycle performance of engineering structures may inevitably be deteriorated due to the fatigue effect caused by long-term exposure to wind loads, which would further increase the structural vulnerability to earthquakes. This paper presents a framework for evaluating the lifetime structural seismic performance under the effect of wind-induced fatigue considering different sources of uncertainties. The seismic behavior of a high-rise steel-concrete composite frame with buckling-restrained braces (FBRB) during its service life is systematically investigated using the proposed approach. Recorded field data for the wind hazard of Fuzhou, Fujian Province of China from Jan. 1, 1980 to Mar. 31, 2019 is collected, based on which the distribution of wind velocity is constructed by the Gumbel model after comparisons. The OpenSees platform is employed to establish the numerical model of the FBRB and conduct subsequent numerical computations. Allowed for the uncertainties caused by the wind generation and structural modeling, the final annual fatigue damage takes the average of 50 groups of simulations. The lifetime structural performance assessments, including static pushover analyses, nonlinear dynamic time history analyses and fragility analyses, are conducted on the time-dependent finite element (FE) models which are modified in lines with the material deterioration models. The results indicate that the structural performance tends to degrade over time under the effect of fatigue, while the influencing degree of fatigue varies with the duration time of fatigue process and seismic intensity. The impact of wind-induced fatigue on structural responses and fragilities are explicitly quantified and discussed in details.","PeriodicalId":51181,"journal":{"name":"Structural Engineering and Mechanics","volume":"77 1","pages":"197-215"},"PeriodicalIF":2.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66120482","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Experimental and numerical investigations of near-field underwater explosions 近场水下爆炸的实验与数值研究

IF 2.2 4区工程技术

Structural Engineering and Mechanics Pub Date : 2021-01-01 DOI: 10.12989/SEM.2021.77.3.395

Seunggyu Lee, Junghee Cho, Chaemin Lee, Seongpil Cho

引用次数: 3

Orthotropic magneto-thermoelastic solid with higher order dual-phase-lag model in frequency domain 具有高阶频域双相位滞后模型的正交各向异性磁热弹性固体

IF 2.2 4区工程技术

Structural Engineering and Mechanics Pub Date : 2021-01-01 DOI: 10.12989/SEM.2021.77.3.315

P. Lata, Himanshi

引用次数: 3

Torsional wave dispersion in a bi-layered hollow cylinder with inhomogeneous initial stresses caused by internal and external radial pressures 由内外径向压力引起的初始应力不均匀的双层空心圆柱体中的扭波频散

IF 2.2 4区工程技术

Structural Engineering and Mechanics Pub Date : 2021-01-01 DOI: 10.12989/SEM.2021.77.5.571

S. Akbarov, E. Bagirov

{"title":"Torsional wave dispersion in a bi-layered hollow cylinder with inhomogeneous initial stresses caused by internal and external radial pressures","authors":"S. Akbarov, E. Bagirov","doi":"10.12989/SEM.2021.77.5.571","DOIUrl":"https://doi.org/10.12989/SEM.2021.77.5.571","url":null,"abstract":"The present paper studies the influence of the inhomogeneous initial stresses in the bi-layered hollow cylinder and it is assumed that these stresses are caused by the hydrostatic pressures acting on the interior and outer free surfaces of the cylinder. The study is made by utilizing the version of the three-dimensional linearized theory of elastic waves in bodies with initial stresses for which the initial stress-strain state in bodies is determined within the scope of the classical linear theory of elasticity. For the solution to the corresponding eigenvalue problem, the discrete-analytical method is employed. Numerical results are presented and analyzed for concrete selected pairs of materials. According to these results and their analyses, it is established that, unlike homogeneous initial stresses, the influence of the inhomogeneous initial stresses on the torsional wave dispersion has not only quantitative but also qualitative character. For instance, in particular, it is established that as a result of the initial stresses caused by the hydrostatic pressure acting in the interior free surface of the cylinder, the cut-off frequency appears for the fundamental dispersive mode and the values of this frequency increase with the intensity of this pressure.","PeriodicalId":51181,"journal":{"name":"Structural Engineering and Mechanics","volume":"12 1","pages":"571-586"},"PeriodicalIF":2.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66121964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Efficiency of insulation layers in fire protection of FRP-confined RC columns-numerical study frp约束RC柱保温层防火效能的数值研究

IF 2.2 4区工程技术

Structural Engineering and Mechanics Pub Date : 2021-01-01 DOI: 10.12989/SEM.2021.77.5.673

O. El-Mahdy, G. Hamdy, Mohammed Hisham

{"title":"Efficiency of insulation layers in fire protection of FRP-confined RC columns-numerical study","authors":"O. El-Mahdy, G. Hamdy, Mohammed Hisham","doi":"10.12989/SEM.2021.77.5.673","DOIUrl":"https://doi.org/10.12989/SEM.2021.77.5.673","url":null,"abstract":"This paper addresses the efficiency of thermal insulation layers applied to protect structural elements strengthened by fiber-reinforced polymers (FRP) in the case of fire event. The paper presents numerical modeling and nonlinear analysis of reinforced concrete (RC) columns externally strengthened by FRP and protected by thermal insulation layers when subjected to elevated temperature specified by standard fire tests, in order to predict their residual capacity and fire endurance. The adopted numerical approach uses commercial software includes heat transfer, variation of thermal and mechanical properties of concrete, steel reinforcement, FRP and insulation material with elevated temperature. The numerical results show good agreement with published results of full-scale fire tests. A parametric study was conducted to investigate the influence of several variables on the structural response and residual capacity of insulated FRP-confined columns loaded by service loads when exposed to fire. The residual capacity of FRP-confined RC column was affected by concrete grade and insulation material and was shown to improve substantially by increasing the concrete cover and insulation layer thickness. By increasing the VG insulation layer thickness 15, 32, 44, 57 mm, the loss in column capacity after 5 hours of fire was 30%, 13%, 7% and 5%, respectively. The obtained results demonstrate the validity of the presented approach for estimation of fire endurance and residual strength, as an alternative for fire testing, and for design of fire protection layers for FRP-confined RC columns.","PeriodicalId":51181,"journal":{"name":"Structural Engineering and Mechanics","volume":"77 1","pages":"673-689"},"PeriodicalIF":2.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66123270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Application of steel-concrete composite pile foundation system as energy storage medium 钢-混凝土复合桩基础体系作为储能介质的应用

IF 2.2 4区工程技术

Structural Engineering and Mechanics Pub Date : 2021-01-01 DOI: 10.12989/SEM.2021.77.6.753

A. Agibayeva, D. Lee, H. Ju, Dichuan Zhang, J. Kim

{"title":"Application of steel-concrete composite pile foundation system as energy storage medium","authors":"A. Agibayeva, D. Lee, H. Ju, Dichuan Zhang, J. Kim","doi":"10.12989/SEM.2021.77.6.753","DOIUrl":"https://doi.org/10.12989/SEM.2021.77.6.753","url":null,"abstract":"Feasibility studies of a reinforced concrete (RC) deep pile foundation system with the compressed air energy storage (CAES) technology were conducted in previous studies. However, those studies showed some technical limitations in its serviceability and durability performances. To overcome such drawbacks of the conventional RC energy pile system, various steel-concrete composite pile foundations are addressed in this study to be utilized as a dual functional system for an energy storage medium and load-resistant foundation. This study conducts finite element analyses to examine the applicability of various composite energy pile foundation systems considering the combined effects of structural loading, soil boundary forces, and internal air pressures induced by the thermos-dynamic cycle of compressed air. On this basis, it was clearly confirmed that the role of inner and outer tubes is essential in terms of reliable storage tank and better constructability of pile, respectively, and the steel tubes in the composite pile foundation can also ensure improved serviceability and durability performances compared to the conventional RC pile system.","PeriodicalId":51181,"journal":{"name":"Structural Engineering and Mechanics","volume":"77 1","pages":"753-763"},"PeriodicalIF":2.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66123836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 6

Nonlinear vibration and stability of FG nanotubes conveying fluid via nonlocal strain gradient theory 基于非局部应变梯度理论的FG纳米管输送流体的非线性振动与稳定性

IF 2.2 4区工程技术

Structural Engineering and Mechanics Pub Date : 2021-01-01 DOI: 10.12989/SEM.2021.78.1.103

V. Dang, H. Sedighi, D. Q. Chan, Ö. Civalek, A. Abouelregal

引用次数: 8

Effect of nonlinear FG-CNT distribution on mechanical properties of functionally graded nano-composite beam 非线性FG-CNT分布对功能梯度纳米复合梁力学性能的影响

IF 2.2 4区工程技术

Structural Engineering and Mechanics Pub Date : 2021-01-01 DOI: 10.12989/SEM.2021.78.2.117

R. Zerrouki, Abdelkader Karas, M. Zidour, A. A. Bousahla, A. Tounsi, F. Bourada, A. Tounsi, K. H. Benrahou, S. R. Mahmoud

{"title":"Effect of nonlinear FG-CNT distribution on mechanical properties of functionally graded nano-composite beam","authors":"R. Zerrouki, Abdelkader Karas, M. Zidour, A. A. Bousahla, A. Tounsi, F. Bourada, A. Tounsi, K. H. Benrahou, S. R. Mahmoud","doi":"10.12989/SEM.2021.78.2.117","DOIUrl":"https://doi.org/10.12989/SEM.2021.78.2.117","url":null,"abstract":"This work focused on the novel numerical tool for the bending responses of carbon nanotube reinforced composites (CNTRC) beams. The higher order shear deformation beam theory (HSDT) is used to determine strain-displacement relationships. A new exponential function was introduced into the carbon nanotube (CNT) volume fraction equation to show the effect of the CNT distribution on the CNTRC beams through displacements and stresses. To determine the mechanical properties of CNTRCs, the rule of the mixture was employed by assuming that the single-walled carbon nanotubes (SWCNTs)are aligned and distributed in the matrix. The governing equations were derived by Hamilton's principle, and the mathematical models presented in this work are numerically provided to verify the accuracy of the present theory. The effects of aspect ratio (l/d), CNT volume fraction (Vcnt), and the order of exponent (n) on the displacement and stresses are presented and discussed in detail. Based on the analytical results. It turns out that the increase of the exponent degree (n) makes the X-beam stiffer and the exponential CNTs distribution plays an indispensable role to improve the mechanical properties of the CNTRC beams.","PeriodicalId":51181,"journal":{"name":"Structural Engineering and Mechanics","volume":"78 1","pages":"117"},"PeriodicalIF":2.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66125030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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: 57

Structural behavior of concrete walls reinforced with ferrocement laminates 钢筋层板加固混凝土墙体的结构性能

IF 2.2 4区工程技术

Structural Engineering and Mechanics Pub Date : 2021-01-01 DOI: 10.12989/SEM.2021.78.4.455

Y. Shaheen, H. M. Refat, A. M. Mahmoud

{"title":"Structural behavior of concrete walls reinforced with ferrocement laminates","authors":"Y. Shaheen, H. M. Refat, A. M. Mahmoud","doi":"10.12989/SEM.2021.78.4.455","DOIUrl":"https://doi.org/10.12989/SEM.2021.78.4.455","url":null,"abstract":"The present work focuses on experimental and numerical performance of the ferrocement RC walls reinforced with welded steel mesh, expanded steel mesh, fiber glass mesh and tensar mesh individually. The experimental program comprised twelve RC walls having the dimensions of 450 mmx100 mmx1000 mm under concentric compression loadings. The studied variables are the type of reinforcing materials, the number of mesh layers and volume fraction of reinforcement. The main aim is to assess the influence of engaging the new inventive materials in reinforcing the composite RC walls. Non-linear finite element analysis; (NLFEA) was carried out to simulate the behavior of the composite walls employing ANSYS-10.0 Software. Parametric study is also demonstrated to check out the variables that can mainly influence the mechanical behavior of the model such as the change of wall dimensions. The obtained numerical results indicated the acceptable accuracy of FE simulations in the estimation of experimental values. In addition, the strength gained of specimens reinforced with welded steel mesh was higher by amount 40% compared with those reinforced with expanded steel mesh. Ferrocement specimens tested under axial compression loadings exhibit superior ultimate loads and energy absorbing capacity compared to the conventional reinforced concrete one.","PeriodicalId":51181,"journal":{"name":"Structural Engineering and Mechanics","volume":"78 1","pages":"455"},"PeriodicalIF":2.2,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66125940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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