Civil Engineering Infrastructures Journal-CEIJ最新文献_第8页

Considering a New Sample Unit Definition for Pavement Condition Index 考虑一种新的路面状况指标样本单元定义

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Civil Engineering Infrastructures Journal-CEIJ Pub Date : 2019-06-01 DOI: 10.22059/CEIJ.2019.254376.1472

Alireza Khavandi Khiavi, M. Naghiloo, Ramin Rasouli

引用次数: 1

Optimum Structural Design with Discrete Variables Using League Championship Algorithm 基于League Championship算法的离散变量结构优化设计

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Civil Engineering Infrastructures Journal-CEIJ Pub Date : 2018-12-01 DOI: 10.7508/CEIJ.2018.02.002

A. H. Kashan, S. Jalili, S. Karimiyan

引用次数: 5

Rectangular and Cylindrical TLDs with Rotatable Baffles to Improve Seismic Behavior of Structures, a Numerical Study 带可旋转挡板的矩形和圆柱形TLDs改善结构抗震性能的数值研究

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Civil Engineering Infrastructures Journal-CEIJ Pub Date : 2018-12-01 DOI: 10.7508/CEIJ.2018.02.006

S. M. Zahrai, S. Kakouei

引用次数: 1

Seismic Reliability Analysis of Offshore Fixed Platforms Using Incremental Dynamic Analysis 基于增量动力分析的海上固定平台地震可靠性分析

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Civil Engineering Infrastructures Journal-CEIJ Pub Date : 2018-12-01 DOI: 10.7508/CEIJ.2018.02.001

M. Mohammadizadeh, Kazem Vahidi, H. Ronagh

引用次数: 3

Impact of Integration on Straining Modes and Shear-Locking for Plane Stress Finite Elements 积分对平面应力有限元应变模式和剪切锁定的影响

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Civil Engineering Infrastructures Journal-CEIJ Pub Date : 2018-12-01 DOI: 10.7508/CEIJ.2018.02.011

M. Ghassemieh, B. B. Ajaei

引用次数: 2

An Intensity Measure for Seismic Input Energy Demand of Multi-Degree-of-Freedom Systems 多自由度系统地震输入能量需求的强度测度

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Civil Engineering Infrastructures Journal-CEIJ Pub Date : 2018-12-01 DOI: 10.7508/CEIJ.2018.02.008

B. Ganjavi, A. Rezagholilou

{"title":"An Intensity Measure for Seismic Input Energy Demand of Multi-Degree-of-Freedom Systems","authors":"B. Ganjavi, A. Rezagholilou","doi":"10.7508/CEIJ.2018.02.008","DOIUrl":"https://doi.org/10.7508/CEIJ.2018.02.008","url":null,"abstract":"Nonlinear dynamic analyses are performed to compute the maximum relative input energy per unit mass for 21 multi-degree-of-freedom systems (MDOF) with preselected target fundamental periods of vibration ranging from 0.2 to 4.0 s and 6 target inter-story ductility demands of 1, 2, 3, 4, 6, 8 subjected to 40 the earthquake ground motions. The efficiency of the several intensity measures as an index for damage potential of ground motion in MDOF systems are examined parametrically. To this end, the dispersion of normalized input energy by different intensity measures have been evaluated and compared. Results of this study show that using all intensity measures will result in a significant discrepancy in input energy spectra of MDOF systems, which are in most cases larger than 0.5 and even can take the value of 1.9 for some cases. This signifies that the evaluated intensity measures may not suitable for MDOF systems. A dimensionless intensity measure as a normalized energy index is proposed for MDOF systems subjected to far-fault earthquakes. It was demonstrated that the proposed normalized input energy values have smaller dispersion compared to those of the other indices for MDOF systems with all ranges of period and ductility ratio used.","PeriodicalId":43959,"journal":{"name":"Civil Engineering Infrastructures Journal-CEIJ","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48595990","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

Investigating the Creep Properties of PET-Modified Asphalt Concrete pet改性沥青混凝土蠕变性能研究

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Civil Engineering Infrastructures Journal-CEIJ Pub Date : 2018-12-01 DOI: 10.7508/CEIJ.2018.02.003

H. Taherkhani, M. Arshadi

{"title":"Investigating the Creep Properties of PET-Modified Asphalt Concrete","authors":"H. Taherkhani, M. Arshadi","doi":"10.7508/CEIJ.2018.02.003","DOIUrl":"https://doi.org/10.7508/CEIJ.2018.02.003","url":null,"abstract":"This study has investigated the creep properties of asphaltic concrete modified with different dosages of waste polyethylene terephthalate (PET) in two different ranges of size. Uniaxial dynamic creep test at 40°C was conducted on the cylindrical specimens of the mixtures. The load was applied in two different frequencies of 0.5 and 5Hz. Creep test results showed that the accumulated strain under dynamic loading increased with increasing PET content, with lower values for the mixtures containing finer PET particles. Moreover, it was found that the accumulated strain under the loading with higher frequency was more than that under lower frequency, with higher sensitivity to frequency for the mixtures containing finer PET. The results of dynamic creep tests were used for determination of the constants of a three stage model. The linear creep slope in the second region of the creep curve and the flow number showed that the increase of PET content and size results in decrease of permanent deformation resistance. However, the mixtures modified with 4% of fine and coarse PET particles had the highest loading cycles at the end of primary creep region, where most of the strain was recoverable.","PeriodicalId":43959,"journal":{"name":"Civil Engineering Infrastructures Journal-CEIJ","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44866216","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: 7

Numerical Evaluation of Progressive Collapse Potential in Reinforced Concrete Buildings with Various Floor Plans Due to Single Column Removal 不同楼面结构钢筋混凝土建筑单柱拆除后连续倒塌电位的数值计算

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Civil Engineering Infrastructures Journal-CEIJ Pub Date : 2018-12-01 DOI: 10.7508/CEIJ.2018.02.010

Freydoon Rezaie, Seyed Mehdi Fakhradini, M. Ghahremannejad

{"title":"Numerical Evaluation of Progressive Collapse Potential in Reinforced Concrete Buildings with Various Floor Plans Due to Single Column Removal","authors":"Freydoon Rezaie, Seyed Mehdi Fakhradini, M. Ghahremannejad","doi":"10.7508/CEIJ.2018.02.010","DOIUrl":"https://doi.org/10.7508/CEIJ.2018.02.010","url":null,"abstract":"Progressive collapse is defined as the spread of an initial damage from one member to another, leading to extensive partial or total collapse of the structure. In this research, the potential of progressive collapse due to a sudden removal of vertical load-bearing elements in reinforced concrete buildings structures with different floor plans such as geometrical regular and irregular floor plans as well as floor plans with and without torsional irregularity were assessed. The buildings were designed according to ACI 318-14 provisions and Iranian seismic code. The progressive collapse potential of the structures was assessed following of a sudden column or shear wall removal in different locations in their first floor using nonlinear dynamic analysis (NDA). Displacement sensitivity and column sensitivity indexes were utilized to compare different cases of load-bearing element removal in each model. Results indicated that in all geometrical regular floor plan, floor plan with reentrant corner and floor plan with torsional irregularity, the most critical case of column removal was removing columns located in outer corners of the plan. In addition, removing external columns was more critical than internal columns. In buildings with shear walls, removing shear walls led to much more critical scenarios than removing columns. Furthermore, results revealed that buildings with torsional irregularity floor plan, designed according to Iranian seismic code, had a lower potential of progressive collapse rather than those buildings with no irregularity.","PeriodicalId":43959,"journal":{"name":"Civil Engineering Infrastructures Journal-CEIJ","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42859106","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

Blast Mitigation Analysis of Semi-Buried Structure 半埋结构的防爆分析

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Civil Engineering Infrastructures Journal-CEIJ Pub Date : 2018-12-01 DOI: 10.7508/CEIJ.2018.02.012

M. D. Goel, Mukesh Kumar, V. Matsagar

{"title":"Blast Mitigation Analysis of Semi-Buried Structure","authors":"M. D. Goel, Mukesh Kumar, V. Matsagar","doi":"10.7508/CEIJ.2018.02.012","DOIUrl":"https://doi.org/10.7508/CEIJ.2018.02.012","url":null,"abstract":"Semi-buried structures are most commonly used at first line of defense along the border between two countries. This demands investigation of their dynamic behaviour under blast loading. Herein, a semi-buried structure with foam sandwiched walls and buttresses to reduce the effect of blast is analysed. The effect of provision of different configurations of buttresses and foam core between two layers of structural wall subjected to explosive loadings is investigated using ABAQUS/Explicit®. Modelling of semi-buried structure is carried out by employing shell elements and soil is modelled using frequency independent spring-dashpot-mass model. The foam core is modelled using brick elements with reduced integration and volumetric hardening. Effect of strain rate on structural steel is modelled by employing Johnson-Cook (J-C) model. Results indicate that geometry of buttresses and foam core type governs structural response to dynamic loading. It is observed that inner wall of the structure is protected by foam provided in between walls and helps in blast mitigation. Further, it is observed that design of such structures is dependent on the correct identification of buttresses type and isolation of inner wall of structure by provision of energy absorbing materials like foam.","PeriodicalId":43959,"journal":{"name":"Civil Engineering Infrastructures Journal-CEIJ","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41248867","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

Three-Dimensional Finite Element Modeling of Stone Column-Improved Soft Saturated Ground 石柱加固软饱和地基三维有限元模拟

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Civil Engineering Infrastructures Journal-CEIJ Pub Date : 2018-12-01 DOI: 10.7508/CEIJ.2018.02.009

M. Shahraki, R. Rafiee-Dehkharghani, K. Behnia

{"title":"Three-Dimensional Finite Element Modeling of Stone Column-Improved Soft Saturated Ground","authors":"M. Shahraki, R. Rafiee-Dehkharghani, K. Behnia","doi":"10.7508/CEIJ.2018.02.009","DOIUrl":"https://doi.org/10.7508/CEIJ.2018.02.009","url":null,"abstract":"Installing stone columns in the ground is an effective improvement technique to increase the load bearing capacity and reduce the consolidation settlement of the loose or weak cohesive soils. In addition to the increase in the bearing capacity and reduction in the settlement, stone columns can accelerate the dissipation rate of the excess pore water pressure generated by the surcharge, which expedites the ground improvement procedure. Due to these advantages, this technique has been widely used to improve the mechanical properties of the soft and problematic soils. In this study, the behavior of stone columns in saturated soft grounds are studied using Finite Element (FE) numerical method. For this purpose, a three-dimensional (3D) FE model of the stone column-improved ground is built considering the nonlinear behavior of the soil and stone columns. This model considers the effect of consolidation, and its accuracy is verified using the unit cell concept and the results of a real ground improvement project in Iran. In addition, a parametric study is performed using the verified FE model to investigate the effect of different material and geometric characteristics of the stone columns on the behavior of improved ground. At the end, the efficacy of the stone column method is compared to that of deep soil mixing (DSM) ground improvement technic.","PeriodicalId":43959,"journal":{"name":"Civil Engineering Infrastructures Journal-CEIJ","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48192409","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