Journal of Structural Engineering & Applied Mechanics最新文献_第4页

Repair of buckled steel braces via buckling zone relocation method 用屈曲区重新定位法修复钢支撑的屈曲

Journal of Structural Engineering & Applied Mechanics Pub Date : 2022-09-30 DOI: 10.31462/jseam.2022.03135142

S. Demir

引用次数: 0

Analysis and stiffeners' design of a steel bridge girder 某钢桥主梁的分析与加劲设计

Journal of Structural Engineering & Applied Mechanics Pub Date : 2022-09-30 DOI: 10.31462/jseam.2022.03181196

Tuğçe Sevil Yaman

{"title":"Analysis and stiffeners' design of a steel bridge girder","authors":"Tuğçe Sevil Yaman","doi":"10.31462/jseam.2022.03181196","DOIUrl":"https://doi.org/10.31462/jseam.2022.03181196","url":null,"abstract":"Plate girders are designed to carry massive loads over large spans. Flanges resist moment and web resists shear forces. Shear strength of steel girders having slender webs is much less than the yielding shear capacity. It is mainly due to the buckling of the web prior to reaching the yield strength of the material. Webs are generally reinforced with transverse stiffeners to increase their buckling strength. Stiffened webs resist shear also after buckling, which is called as post buckling strength. Tension field theories explain the formation of the post buckling strength and predict the stiffened web’s ultimate shear strength. Most design code provisions are set on tension field theories. There exists plenty of tension field theories proposed until today. This paper covers the design shear strength check and design flexural strength check and the stiffeners’ design of a steel girder specimen which was designed intentionally to fail in shear buckling. Analysis and stiffeners’ design were performed according to the provisions for load and resistance factor design (LRFD) in the ANSI/American Institute of Steel Construction (AISC) 360-16 - Specification for Structural Steel Buildings.","PeriodicalId":151121,"journal":{"name":"Journal of Structural Engineering & Applied Mechanics","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125158908","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

Solution of design optimization problems via metaheuristic search methods 用元启发式搜索方法求解设计优化问题

Journal of Structural Engineering & Applied Mechanics Pub Date : 2022-06-30 DOI: 10.31462/jseam.2022.02096116

Betül Üstüner, E. Doğan

{"title":"Solution of design optimization problems via metaheuristic search methods","authors":"Betül Üstüner, E. Doğan","doi":"10.31462/jseam.2022.02096116","DOIUrl":"https://doi.org/10.31462/jseam.2022.02096116","url":null,"abstract":"Metaheuristic algorithms inspired by natural phenomena are frequently used in solving optimization problems recently. Just as every problem has its characteristics, every algorithm has its unique structure. Therefore, problem-specific algorithm selection is an important issue. In addition, metaheuristic algorithms are very open to development. Therefore, improved/modified versions of algorithms are common. Working with benchmarking problems and engineering design problems is the best way to compare the performance and reliability of metaheuristic algorithms. In this study, the performances of firefly (FA), particle swarm optimization (PSO), bat algorithm (BA), ant colony optimization (ACO), glow worms (GSO), and hunting search (HuS) algorithms are compared. An enhanced version of the firefly algorithm (RFA) is also recommended and included in the comparison. A benchmark and five engineering design problems were selected for comparison purposes. All algorithms are set to twenty thousand iterations. The results show that the metaheuristic algorithm that gives the best results varies according to the nature of the problem. Moreover, although it does not change the ranking of the algorithm that gives the best result according to the problem, it shows that RFA gives better results in every problem than FA.","PeriodicalId":151121,"journal":{"name":"Journal of Structural Engineering & Applied Mechanics","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129654300","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

Damage assessment of a cement plant partially collapsed depending on various causes 某水泥厂因多种原因部分倒塌的损害评估

Journal of Structural Engineering & Applied Mechanics Pub Date : 2022-06-30 DOI: 10.31462/jseam.2022.02062076

U. Temelli, Cüneyt Öngören, B. Sayın

引用次数: 0

Comparative fire-following-earthquake performance of code-compliant low-rise base-isolated structures 符合规范的低层基础隔震结构火后地震性能比较

Journal of Structural Engineering & Applied Mechanics Pub Date : 2022-06-30 DOI: 10.31462/jseam.2022.02077095

H. Cilsalar

{"title":"Comparative fire-following-earthquake performance of code-compliant low-rise base-isolated structures","authors":"H. Cilsalar","doi":"10.31462/jseam.2022.02077095","DOIUrl":"https://doi.org/10.31462/jseam.2022.02077095","url":null,"abstract":"Seismic base isolation is an effective way of protecting structures against seismic loads and is very effective in terms of both collapse mitigation of structures and protection of non-structural elements under severe ground shaking. In this study, the structural demand of base-isolated three- and four-story steel moment-resisting frames is determined in case of a fire event followed by an earthquake, and compared with the results of fixed-base frames, which have similar geometry, load, and seismic hazard for a location in California. Four compartments are selected as possible locations for fire events in each building, and beams and columns in those compartments are exposed to a representative temperature increase in time, which includes a cooling phase as well. Maximum, minimum, and residual axial force, and moment demands on elements of the fire compartments, and drift demand of structural frames on the first and second floor, where the fire is assumed to occur, are determined and compared. Results are given in terms of parameters of three-parameter log-normal distribution, hence fragility curves can be constructed for each response considered in the study. Seismic isolation is effective in reducing both maximum and residual drift demand of the frames, and axial force in the beam element for each compartment considered. Fixed-base frames have 20% more maximum axial load on beams. Beam and column elements in the four-story configuration are under relatively more moments in case of a fire, while the performance of three-story frames depends on the location of the assumed fire.","PeriodicalId":151121,"journal":{"name":"Journal of Structural Engineering & Applied Mechanics","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125530592","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

Transverse free vibration of nanobeams with intermediate support using nonlocal strain gradient theory 基于非局部应变梯度理论的中间支承纳米梁横向自由振动

Journal of Structural Engineering & Applied Mechanics Pub Date : 2022-06-30 DOI: 10.31462/jseam.2022.02050061

U. Gül

{"title":"Transverse free vibration of nanobeams with intermediate support using nonlocal strain gradient theory","authors":"U. Gül","doi":"10.31462/jseam.2022.02050061","DOIUrl":"https://doi.org/10.31462/jseam.2022.02050061","url":null,"abstract":"In the present study, the transverse free vibration of intermediately supported nanobeams is investigated in the framework of size-dependent nonlocal strain gradient theory. Unlike the classical elasticity theory, nonlocal strain gradient theory considers the micro/nano scale effects in mechanical analysis of size-dependent structures. The potential and kinetic energies have been derived for the nanobeam model and the Ritz method has been used to determine the natural frequencies of intermediately supported nanobeams. A cantilever nanobeam model with intermediate support is considered in the analysis. By changing the position of the intermediate support, dimensionless vibration frequencies of the nanobeam model have been obtained. Obtained results from the present nonlocal strain gradient theory showed that hardening or softening material responses have been observed according to the classical elasticity theory depending on the magnitude of the material length scale parameter and nonlocal scale parameter. This mechanical behavior can provide an advantage to designers while modeling the micro/nanostructures. Present results can be used for the design of nano-sensors, nanotube-based resonators, and oscillators.","PeriodicalId":151121,"journal":{"name":"Journal of Structural Engineering & Applied Mechanics","volume":"354 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122795552","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

Lateral load performance of a reinforced concrete frame with pultruded GFRP box braces 拉挤玻璃钢箱撑钢筋混凝土框架的横向荷载性能

Journal of Structural Engineering & Applied Mechanics Pub Date : 2022-03-31 DOI: 10.31462/jseam.2022.01040049

T. Ülger, Muhammet Karabulut, Necati Mert

{"title":"Lateral load performance of a reinforced concrete frame with pultruded GFRP box braces","authors":"T. Ülger, Muhammet Karabulut, Necati Mert","doi":"10.31462/jseam.2022.01040049","DOIUrl":"https://doi.org/10.31462/jseam.2022.01040049","url":null,"abstract":"Reinforced concrete buildings, which constitute most of the building stock in Turkey, should be examined in terms of earthquake resistance. Many studies have been carried out to increase the seismic resistance of reinforced concrete (RC) structures against earthquakes. In this study, a single-story, single-span RC frame stiffened with chevron steel braces was chosen as a reference frame and laterally loaded to failure. In the first step, the experimentally obtained static lateral load-deflection curve was verified by non-linear finite element (FE) analysis. Then, the uniaxial tensile properties of the selected glass fiber reinforced polymer (GFRP) materials were verified using FE analysis with the results found in the literature. In the second step, three different GFRP box braces with different axial stiffnesses were investigated and the results were compared with those of the steel chevron braces. Finally, the lateral load performance and expected buckling failure of the GFRP box braces in an RC moment frame have been presented and discussed in this study. Considering the lightweight of the GFRP sections, the lateral load capacity of the RC frame with GFRP braces was improved as much as the steel braces, and the maximum gain was about 47% more when the equal axial stiffness of steel brace was provided to GFRP brace. Ductility and story drift of the considered braced moment frames are presented.","PeriodicalId":151121,"journal":{"name":"Journal of Structural Engineering & Applied Mechanics","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117227856","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

Structural response of multi-story building subjected to blast load 爆炸荷载作用下多层建筑的结构响应

Journal of Structural Engineering & Applied Mechanics Pub Date : 2022-03-31 DOI: 10.31462/jseam.2022.01013021

A. Toy, B. Sevim

引用次数: 2

The static and free vibration analyses of axially functionally graded elliptical beams via mixed FEM 用混合有限元法分析了轴向功能梯度椭圆梁的静振动和自由振动

Journal of Structural Engineering & Applied Mechanics Pub Date : 2022-03-31 DOI: 10.31462/jseam.2022.01022039

M. Ermiş, Gökay Aydoğan, Oğuzhan Kır, Ü. N. Arıbaş, M. H. Omurtag

{"title":"The static and free vibration analyses of axially functionally graded elliptical beams via mixed FEM","authors":"M. Ermiş, Gökay Aydoğan, Oğuzhan Kır, Ü. N. Arıbaş, M. H. Omurtag","doi":"10.31462/jseam.2022.01022039","DOIUrl":"https://doi.org/10.31462/jseam.2022.01022039","url":null,"abstract":"The objective of this study is to investigate the behavior of the static and free vibration analyses of axially functionally graded elliptical planar curved beams using a mixed finite element method (MFEM) based on the Timoshenko beam theory. A two-noded curved mixed finite element has 12 field variables at each node. These variables denote three displacements, three cross-sectional rotations, three forces, two bending moments, and torque, respectively. The functionally graded material is composed of ceramic-particle material and metal-matrix material. The volume fraction of ceramic and metal materials varies along the beam axis. The effective material properties (modulus of elasticity, Poisson's ratio, and density) of the functionally graded material are determined according to the rule of mixture. It is aimed in the benchmark examples to present the influence of ceramic-particle material and non-homogeneity index of material gradation, the minimum radius of the elliptical beam, and boundary condition to the results of static and free vibration analysis in detail.","PeriodicalId":151121,"journal":{"name":"Journal of Structural Engineering & Applied Mechanics","volume":"85 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130307438","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

Analytical, numerical, and experimental determination of dynamic characteristics of prestressed concrete girders 预应力混凝土梁动力特性的分析、数值和实验测定

Journal of Structural Engineering & Applied Mechanics Pub Date : 2022-03-31 DOI: 10.31462/jseam.2022.01001012

Barbaros Atmaca, Ş. Ateş, M. Günaydın

{"title":"Analytical, numerical, and experimental determination of dynamic characteristics of prestressed concrete girders","authors":"Barbaros Atmaca, Ş. Ateş, M. Günaydın","doi":"10.31462/jseam.2022.01001012","DOIUrl":"https://doi.org/10.31462/jseam.2022.01001012","url":null,"abstract":"To determine the dynamic characteristics of bridges with prestressed girders, their natural frequencies and mode shapes used to construct the superstructure must be known. However, there is no agreement among scientists on how prestress force affects the dynamic characteristics of a precast prestressed girder. The purpose of this paper is to obtain the dynamic characteristics of prestressed concrete girders through analytically, numerically, and operational modal testing. For this purpose, one of a typical precast I-girder with 1.2 m height and 27.45 m effective span length is selected as a numerical application. The three-dimensional (3D) finite element model (FEM) of the girder is modeled by SAP2000. Experimental measurements of the girder were conducted at the construction site by the operational modal testing method. For experimental measurements, ten uniaxial seismic accelerometers were mounted at the top flange of the PSC girder in the x- and z-direction. The vibrations that occur from the movement of trucks and cranes at the construction site and the impact of the hammer were measured by these accelerometers as acceleration. The measured signal was collected at the data bank and then sent to the computer equipped with Operational Modal Analysis software which used Enhanced Frequency Domain Decomposition and Stochastic Subspace Identification techniques. The dynamic behaviors of girder were derived from analysis performed by this software. At the end of the study, the dynamic characteristic was obtained by the analytical prediction, numerical and experimental were compared with each other. It is seen that natural frequencies and mode shapes obtained from theoretical prediction, numerical and operational modal testing are not too far apart.","PeriodicalId":151121,"journal":{"name":"Journal of Structural Engineering & Applied Mechanics","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114074455","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

Journal of Structural Engineering &amp; Applied Mechanics最新文献

Journal of Structural Engineering & Applied Mechanics最新文献