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钢拱架在升温状态下的非线性弹塑性分析

钢结构(中英文) 2010年第4期 80-80页

作者： amin heidarpour Abdul Azim Abdullah Mark A.Bradford

提出了一种新型的非离散化方法,用于分析钢拱架在升温状态下的性能。钢拱架中单轴对称的横截面上具有弹性和塑性区域,经受着任意方向的热效应,如沿拱的长度方向和沿横截面的深度方向。公式中考虑了高温时可能产生的几何及材料非线性,以... 详细信息

提出了一种新型的非离散化方法,用于分析钢拱架在升温状态下的性能。钢拱架中单轴对称的横截面上具有弹性和塑性区域,经受着任意方向的热效应,如沿拱的长度方向和沿横截面的深度方向。公式中考虑了高温时可能产生的几何及材料非线性,以及潜在的悬链线效应的影响。采用ABAQUS对几何模型进行了非线性分析,通过与分析结果的对比验证了该模型的有效性与准确性。所提出的方法也给出了一些重要参数,如温度加载时钢拱架横截面底部纤维的温度分布,横截面顶部纤维与底部纤维的温差。所提出的模型也使有限元程序能更加准确地进行计算,并为钢拱架的抗火设计提供了一个计算的平台。

关键词：钢拱架非离散化模型非线性材料几何非线性升温

Geometrically Nonlinear Bending Analysis of Metal-Ceramic Composite Beams under Thermomechanical Loading

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Chinese Journal of Mechanical Engineering 2013年第4期26卷 701-713页

作者： TORABIZADEH Mohammad amin Department of Industrial Design Engineering University of Applied Science and Technology

A new method is developed to derive equilibrium equations of Metal-Ceramic beams based on first order shear deformation plate theory which is named first order shear deformation beam theory2(FSDBT2). Equilibrium equations obtained from conventional method (FSDBT1) is compared with FSDBT2 and the case of cylindrical bending of Metal-Ceramic composite plates for non-linear thermomechanical deformations and various loadings and boundary conditions. These equations are solved by using three different methods (analytical, perturbation technique and finite element solution). The through-thickness variation of the volume fraction of the ceramic phase in a Metal-Ceramic beam is assumed to be given by a power-law type function. The non-linear strain-displacement relations in the von-Kármán sense are used to study the effect of geometric non-linearity. Also, four other representative averaging estimation methods, the linear rule, Mori-Tanaka, Self-Consistent and Wakashima-Tsukamoto schemes, by comparing with the power-law type function are also investigated. Temperature distribution through the thickness of the beams in thermal loadings is obtained by solving the one-dimensional heat transfer equation. Finally it is concluded that for Metal-Ceramic composites, these two theories result in identical static responses. Also the displacement field and equilibrium equations in the case of cylindrical bending of Metal-Ceramic plates are the same as those supposed in FSDBT2.

关键词： thermomechanical loading functionally graded beams monlinear analysis analytical solution

Crack detection of the cantilever beam using new triple hybrid algorithms based on Particle Swarm Optimization

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Frontiers of Structural and Civil Engineering 2022年第9期16卷 1127-1140页

作者： amin GHANNADIASL Saeedeh GHAEMIFARD Department of Civil Engineering University of Mohaghegh ArdabiliArdabil 56199-11367Iran

The presence of cracks in a concrete structure reduces its performance and increases in the size of cracks result in the failure of the ***,the accurate determination of crack characteristics,such as location and depth,is one of the key engineering issues for assessment of the reliability of *** paper deals with the inverse analysis of the crack detection problems using triple hybrid algorithms based on Particle Swarm Optimization(PSO);these hybrids are Particle Swarm Optimization-Genetic Algorithm-Firefly Algorithm(PSO-GA-FA),Particle Swarm Optimization-Grey Wolf Optimization-Firefly Algorithm(PSO-GWO-FA),and Particle Swarm Optimization-Genetic Algorithm-Grey Wolf Optimization(PSO-GA-GWO).A strong correlation exists between the changes in the natural frequency of a concrete beam and the crack ***,the location and depth of a crack in a beam can be predicted by measuring its natural ***,the measured natural frequency can be used as the input parameter of the *** this paper,this is applied to identify crack location and depth in a cantilever beam using the new hybrid *** results show that among the proposed triple hybrid algorithms,the PSO-GA-FA and PSO-GWO-FA algorithms are much more effective than PSO-GA-GWO algorithm for the crack detection.

关键词： crack cantilever beam triple hybrid algorithms Particle Swarm Optimization

Effect of the spectral shape of ground motion records on the collapse fragility assessment of degrading SDOF systems

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Earthquake Engineering and Engineering Vibration 2021年第4期20卷 925-941页

作者： amin Norouzi Mehdi Poursha Department of Civil Engineering Sahand University of TechnologyTabriz 51335-1996Iran Earthquake Engineering Research Center Sahand University of TechnologyTabriz 51335-1996Iran

The main purpose of this paper is to study the collapse capacity of single degree of freedom(SDOF)systems and to produce fragility curves as well as collapse capacity spectra while considering a broad range of structural parameters,including system degradation,the P-Δeffect,ductility capacity and the post-capping stiffness *** modified Ibarra-Krawinkler deterioration model was used to consider hysteretic behavior.A comprehensive study was conducted to extract the collapse capacity spectrum of SDOF systems with a wide range of periods,varying from 0.05 to 4 s,to cover short,intermediate and long *** dynamic analysis(IDA)was performed for SDOF systems to identify the condition in which the collapse capacity of the system is *** IDAs were performed using different sets of seismic ground *** ground motion records were categorized into different sets based on three spectral shape parameters,including the epsilon,SaRatio and N_(p).The collapse fragility curves of SDOF systems with different periods were extracted to illustrate the collapse capacity at different probability *** results show that structural degradation and ductility as well as the spectral shape parameters significantly affect the collapse capacity of SDOF *** the other hand,the post-capping stiffness ratio and small levels of the P-Δeffect do not remarkably change collapse ***,the collapse capacity of SDOF systems is more sensitive to the records categorized based on SaRatio and N_(p)than those classified based on epsilon.

关键词： collapse capacity fragility analysis degrading SDOF system IDA curve Epsilon,N_(p) SaRatio P-Δeffect

THREE NONTRIVIAL SOLUTIONS FOR A NONLINEAR ANISOTROPIC NONLOCAL EQUATION

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Acta Mathematica Scientia 2018年第4期38卷 1296-1310页

作者： amin ESFAHANI School of Mathematics and Computer Science Damghan University

In this article, we establish the existence of a sign-changing solution and two sign- constant solutions for nonlinear nonlocal problem involving the BO-ZK operator on bounded domain. Our main tool is constrained mini... 详细信息

关键词： sign-constant and nodal solutions BO-ZK operator variational method

Advanced Functional Electromagnetic Shielding Materials:A Review Based on Micro‑Nano Structure Interface Control of Biomass Cell Walls

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Nano-Micro Letters 2025年第1期17卷 98-134页

作者： Yang Shi Mingjun Wu Shengbo Ge Jianzhang Li Anoud Saud Alshammari Jing Luo Mohammed A.amin Hua Qiu Jinxuan Jiang Yazeed M.Asiri Runzhou Huang Hua Hou Zeinhom M.El‑Bahy Zhanhu Guo Chong Jia Kaimeng Xu Xiangmeng Chen Co‑Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing 210037People’s Republic of China State Key Laboratory of Efficient Production of Forest Resourced Beijing Forestry UniversityQinghua East Road 35Haidian DistrictBeijing 100083People’s Republic of China Department of Physics Faculty of Sciences‑ArarNorthern Border UniversityArar 91431Saudi Arabia Department of Chemistry College of ScienceTaif UniversityP.O.Box 1109921944 TaifSaudi Arabia Shaanxi Key Laboratory of Macromolecular Science and Technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’anShaanxi 710072People’s Republic of China Integrated Composites Lab Department of Mechanical and Construction EngineeringNorthumbria UniversityNewcastle Upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024People’s Republic of China Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr CityCairo 11884Egypt Yunnan Provincial Key Laboratory of Wood Adhesives and Glued Products International Joint Research Center for Biomass MaterialsSouthwest Forestry UniversityKunming 650224People’s Republic of China School of Science Henan Agricultural UniversityZhengzhou 450002People’s Republic of China

Research efforts on electromagnetic interference(EMI)shielding materials have begun to converge on green and sustainable biomass *** materials offer numerous advantages such as being lightweight,porous,and *** to their porous nature,interfacial compatibility,and electrical conductivity,biomass materials hold significant potential as EMI shielding *** concerted efforts on the EMI shielding of biomass materials have been reported,this research area is still relatively new compared to traditional EMI shielding *** particular,a more comprehensive study and summary of the factors influencing biomass EMI shielding materials including the pore structure adjustment,preparation process,and micro-control would be *** preparation methods and characteristics of wood,bamboo,cellulose and lignin in EMI shielding field are critically discussed in this paper,and similar biomass EMI materials are summarized and *** composite methods and fillers of various biomass materials were *** paper also highlights the mechanism of EMI shielding as well as existing prospects and challenges for development trends in this field.

关键词： Biomass materials Electromagnetic interference shielding Micro-nano structure interface control Conductivity

Insecticidal efficacy of three vegetable oils as post-harvest grain protectants of stored wheat against Rhyzopertha dominica （F.）（Coleoptera： Bostrychidae）

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Insect Science 2007年第2期14卷 145-150页

作者： amin NIKPAY Department of Entomology College of Agriculture Urmia University Urmia Iran

The lesser grain borer, Rhyzopertha dominica is a major insect pests of stored grain in the tropics. Vegetable oils （chamomile, sweet almond and coconut） at 2.5, 3.5, 5.0, 7.0 and 10.0 mL/kg were tested against Rhyzopertha dominica （F.） in wheat grain. All bioassays were conductr, d at 30℃ and 65% ＋ 2% RH. Treatments with vegetable oils at high dose （10.0 mL/kg） achieved over 95% control within 24 h of exposure to freshly treated grain, There was little difference between the three oils in their effect. Persistence of oils in grains was tested at short-term storage intervals （48, 72 and 96 h） and intermediate-term intervals （10, 20 and 30 days） after treatments. The activity of all products decreased with storage period. Seed viability was reduced by the high dose rate （10.0 mL/kg） of oil treatments. The potential use of vegetable oils as supplementary or alternative grain protectants against insect damage in traditional grain storage in developing countries is discussed.

关键词： Rhyzopertha dominica seed viability traditional grain storage tropics,vegetable oils

Traveling Wave Solutions for Generalized Bretherton Equation

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Communications in Theoretical Physics 2011年第3期55卷 381-386页

作者： amin Esfahani School of Mathematics and Computer Science Damghan University Damghan 36716-41167 Iran

This paper studies the Generalized Bretherton equation using trigonometric function method including the sech-function method, the sine-cosine function method, and the tanh-function method, and He＇s semi-inverse method （He＇s variational method）. Various traveling wave solutions are obtained, revealing an intrinsic relationship among the amplitude, frequency, and wave speed.

关键词： Bretherton equation traveling wave trigonometric function method variational method

Probabilistic load curtailment estimation using posterior probability model and twin support vector machine

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Journal of Modern Power Systems and Clean Energy 2019年第4期7卷 665-675页

作者： Rozhin ESKANDARPOUR amin KHODAEI Department of Electrical and Computer Engineering University of DenverDenverCO 80208USA

Estimating the potential load curtailments as a result of hurricane is of great significance in improving the paper proposes a three-step sequential method in identifying such load curtailments prior to *** the first step,a twin support vector machine(TWSVM)model is trained on path/intensity information of previous hurricanes to enable a deterministic outage state assessment of the grid components in response to upcoming *** TWSVM model is specifically used as it is suitable for handling imbalanced *** the second step,a posterior probability sigmoid model is trained on the obtained results to convert the deterministic results into probabilistic outage *** outage states enable the formation of probability-weighted contingency ***,the obtained component outages are integrated into a load curtailment estimation model to determine the expected results,tested on the standard IEEE 118-bus system and based on synthetic datasets,illustrate the high accuracy emergency response and the recovery of power *** potential load curtailments in power *** simulation of the proposed method.

关键词： Hurricanes Machine learning Power system resilience Predictive analytics