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The Flexural Behavior Study of Steel-Concrete Composite Continuous Slab

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The Flexural Behavior Study of Steel-Concrete Composite Cont...

作者： Sharmila raut（诺拉）东南大学

学位级别：硕士

钢-混凝土组合板是由底部钢板和上部混凝土构成,通过剪切连接件如焊钉、PBL连接器或其他类型的剪切连接件将钢板和混凝土连接在一起。与普通钢筋混凝土板相比,钢-混凝土组合板具有更高的抗弯刚度、极限承载能力,以及较好的延性性能。为... 详细信息

钢-混凝土组合板是由底部钢板和上部混凝土构成,通过剪切连接件如焊钉、PBL连接器或其他类型的剪切连接件将钢板和混凝土连接在一起。与普通钢筋混凝土板相比,钢-混凝土组合板具有更高的抗弯刚度、极限承载能力,以及较好的延性性能。为了研究钢-混凝土连续组合板的抗弯性能,对6个试件进行静载试验,包括一个简支钢筋混凝土板,两个不同间距栓钉连接的连续组合板和三个不同PBL连接数量的连续组合板;测试了钢板、纵向钢筋和受压区混凝土的应变、组合板的挠度、界面滑移和裂缝分布,以及极限承载力和失效模式。进而基于ABAQUS软件建立了上述6个试件的有限元模型,考虑几何非线性和材料非线性,对连续复合板进行了深入非线性数值分析,数值模拟结果与试验结果吻合良好。进一步地,在试验和有限元分析的基础上,选择混凝土等级、组合板高度、钢板厚度和PBL连接件厚度等进行参数影响分析,进一步分析钢-混凝土连续组合板的抗弯性能。得到的主要结论如下:(1)在竖向四点弯曲荷载作用下,钢-混凝土连续组合板基本上分三个阶段:线弹性阶段、弹塑性阶段和塑性极限阶段;在达到极限载荷后,在CSS-3和CSP-1试件中,荷载-挠度曲线存在软化下降阶段,而其余的试件则未发生软化下降。(2)带有PBL剪切连接件的CSP-1试件具有相对较大的刚度,极限承载能力高于栓钉剪切连接件;此外,试验结果表明,在混凝土板的初始开裂方面,栓钉连接的组合板表现出比PBL连接的组合板更为良好的开裂性能;但总体而言,PBL和焊钉连接件都是组合板的有效剪切连接装置。(3)利用ABAQUS软件进行有限元分析,可以准确预测连续组合板的弹性、弹塑性和塑性极限性能;数值模拟结果与试验结果较为吻合;表明底板钢板的存在可以有效地提高组合板的力学性能。(4)参数影响分析表明:随着混凝土等级的增加,组合板的承载力增大;随着混凝土板厚度的增加,承载力逐渐趋于稳定;PBL厚度和底部钢板厚度对组合板的抗弯性能具有显著的影响。因此,可以实际工程需要,优化设计组合板的底部钢板厚度和PBL钢板的厚度。(5)基于试验和有限元模拟结果,提出了简化的PBL连接和栓钉连接的连续组合板的抗弯承载力计算方法,该方法的结果与CSS-1和CSP-1的试验结果较为一致,误差在可接受的范围;但对其他的试件的预测结果存在较大的误差,主要原因在于不同剪力连接的布置及构造;因此,应该对连续组合板的抗弯简化计算方法进行进一步的研究。

关键词：钢-混凝土连续组合板焊钉剪力连接件 PBL剪力连接件抗弯试验非线性有限元计算抗弯承载力计算

Comparison of eigensensitivity and ANN based methods in model updating of an eight-story building

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Earthquake Engineering and Engineering Vibration 2015年第3期14卷 453-464页

作者： Prabakaran K ashok Kumar Shashi Kant Thakkar Department of Civil Engineering PSG College of Technology Department of Earthquake Engineering IIT Roorkee

Analytical models prepared from field drawings do not generally provide results that match with experimental *** error may be due to uncertainties in the property of materials,size of members and errors in the modelling *** is important to improve analytical models using experimentally obtained *** the past several years,data obtained from ambient vibration testing have been successfully used in many cases to update and match dynamic behaviors of analytical models with real *** paper presents a comparison between artificial neural network(ANN) and eigensensitivity based model updating of an existing multi-story building.A simple spring-mass analytical model,developed from the structural drawings of the building,is considered and the corresponding spring stiffness and lumped mass of all floors are chosen as updating *** advantages and disadvantages of these updating methods are *** advantage is that both methods ensure a physically meaningful model which canbe further employed in determining structural response and health monitoring.

关键词： ambient vibration measurement model updating artif

BOMBAY THROUGH THE AGES

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技术经济与管理研究 1998年第3期 17-18页

作者： Vishakha raut, Mayor of Mumbai

Removal of Bi(Ⅲ) with Adsorption Technique Using Coconut Shell Activated Carbon

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Chinese Journal of Chemical Engineering 2012年第4期20卷 768-775页

作者： SARTAPE Ashish MANDHARE Aniruddha SALVI Prathmesh PAWAR Dattatraya raut Prakash ANUSE Mansing KOLEKAR Sanjay Analytical Chemistry Laboratory Department of ChemistryShivaji UniversityKolhapur-416 004India Department of Environmental Science Shivaji UniversityKolhapur-416 004India

In present study,we report the preparation of coconut shell activated carbon as adsorbent and its appli-cation for Bi(Ⅲ) removal from aqueous *** developed adsorbent was characterized with scanning elec-tron microscope(SEM),Fourier Transform Infrared(FTIR),C,H,N,S analyzer,and BET surface area *** parameters examined include agitation time,initial concentration of Bi(Ⅲ),adsorbent dose and *** maximum adsorption of Bi(Ⅲ)(98.72%) was observed at 250 mg·L-1 of Bi(Ⅲ) and adsorbent dose of 0.7 g when agitation was at 160 r·min-1 for 240 min at(299±2) *** thermodynamic parameters such as Gibb's free energy(△Gθ),enthalpy(△Hθ) and entropy(△Sθ) were *** the isotherm models applied to adsorption study,the Langmuir isotherm model fits better than the Freundlich *** maximum adsorption capacity from the Langmuir isotherm was 54.35 mg?g?1 of Bi(Ⅲ).The kinetic study of the adsorption shows that the pseudo second order model is more appropriate than the pseudo first order *** result shows that,coconut shell ac-tivated carbon is an effective adsorbent to remove Bi(Ⅲ) from aqueous solutions with good adsorption capacity.

关键词： absorption bismuth(Ⅲ) coconut shell activated carbon isotherm

Afterword to varicocele and male infertility： curreni concepts and future perspectives

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Asian Journal of Andrology 2016年第2期18卷 319-322页

作者： Sandro C Esteves ashok Agarwal ANDROFERT Center for Male Reproduction Av.Dr. Heitor Penteado 1464 Campinas SP 13075-460Brazil American Center for Reproductive Medicine Cleveland Clinic 10681 Carnegie Avenue X-11Cleveland OH 44195 USA.

We summarize and comment on the topics discussed by the contributors to this Special Issue of Asian Journal of Andrology. The scope of varicocele covers a wide spectrum, including proteomics and metabolomics, hormonal control, interventional therapy, and assisted reproductive technology （ART）. The selection of topics demonstrates the exciting breadth of this thematic area and the opportunity research holds for both increasing the understanding and improving the reproductive health of males with varicocele.

关键词： @@

Standardization of harvesting age of bamboo shoots with respect to nutritional and anti-nutritional components

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Journal of Forestry Research 2013年第1期24卷 83-90页

作者： ashok K. Pandey Vijayalakshmi Ojha Tropical Forest Research Institute Indian Council of Forestry Research and EducationP.O. RFRCMandla RoadJabalpur- 482 021India.

Bamboo shoots can be harvested at different ages but the data on the changes in nutritional composition with age are scanty. We standardized harvesting age of bamboo shoots in central India to obtain best quality produce with respect to nutritional composition. The shoots harvested on different days （2–20 days after emergence from ground） were analyzed for their nutritional （dietary fibres, carbohydrates, proteins, total phenols, ascorbic acid, sodium, potassium, phosphorus, calcium, magnesium and phenolic acids） and anti nutritional （cyanogen） constituents. A significant variation （at p ≤ 0.5） was observed in the nutritional composition of shoots of Dendrocalamus asper, D. strictus and Bambusa tulda harvested at different days. An overall decrease was observed in proteins and total phenols while dietary fibres and carbohydrates increased with ages. Significant variation （at p ≤ 0.5） was also observed in phenolic acids while minerals did not vary significantly. Results revealed that the optimum harvesting age for D. asper, D. strictus and B. tulda was on 10–14 days, 6–10 days and 10–16 days （after emergence from the ground） respectively. These results can be used to obtain quality bamboo shoots.

关键词： Bamboo shoots harvesting nutritional status central India phenolic acids anti-nutrient

Effects of particle size and confining pressure on breakage factor of rockfill materials using medium triaxial test

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Journal of Rock Mechanics and Geotechnical Engineering 2016年第3期8卷 378-388页

作者： ashok Kumar Gupta Civil Engineering Department Jaypee University of Information Technology

Rockfill dams are mostly constructed using blasted rockfill materials obtained by blasting rocks or alluvial rockfill materials collected from the riverbeds. Behaviors of rockfill materials and their characterization signifcantly depend on breakage factor observed during triaxial loading. In this paper, two modeled rockfill materials are investigated by using medium triaxial cell. Drained triaxial tests are conducted on various sizes of modeled rockfill materials used in the two dams, and test data are analyzed accordingly. Breakage factor of rockfill material is studied and the effects of particle size and confining pressure on breakage factor are investigated using medium triaxial cell as many researchers have already conducted investigation using large triaxial cell.

关键词： Triaxial testsRockfill materialsParticle sizeConfining pressureBreakage factor

Sustainable remediation of failed slope using helical soil nails

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Journal of Mountain Science 2023年第6期20卷 1742-1758页

作者： Saurabh RAWAT ashok Kumar GUPTA Pankaj SHARMA Department of Civil Engineering Jaypee University of Information Technology Department of Civil Engineering Chitkara University Institute of Engineering and TechnologyChitkara University

The performance of a helical soil nailed structure is dependent on the installation torque required and the consequent pullout resistance *** present research work aims at proposing theoretical models to estimate the required torque during installation of helical soil ***,theoretical models are also developed to predict the pullout capacity of single and group of the helical nail for uniform and staggered *** proposed model predicts the pure-elastic and elastic-plastic pullout behavior of different helical *** equation for estimating the capacity-totorque Ratio(Kt)has also been developed for different nail shaft *** results from the proposed models are validated with experimental results obtained from model testing of both single and group of helical *** predicted results are also compared for validation with the published *** results for installation torque and pullout load depict that the developed models predict values which are in accordance with the experimental results and are also found in good agreement with the published ***,the proposed models can effectively be used by the filed engineers for estimating the required installation torque and corresponding pullout capacities for single or double plate helical soil nails in cohesionless soil under surcharge pressure range of 0–50k Pa.

关键词： Theoretical torque Pullout force Pure elastic Elastic plastic Capacity to torque ratio

Dry sliding wear behavior of stir cast AA6061-T6/AlN_p composite

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Transactions of Nonferrous Metals Society of China 2014年第9期24卷 2785-2795页

作者： B.ashok KUMAR N.MURUGAN I.DINAHARAN Department of Mechanical Engineering Faculty of EngineeringErode Builder Educational Trust’s Group of InstitutionsNathakadaiyur Kangayam – 638108 Tirupur District Tamil Nadu India Department of Mechanical Engineering Coimbatore Institute of TechnologyCoimbatore – 641014 Tamil Nadu India Department of Mechanical Engineering V V College of Engineering Tisaiyanvilai – 627657 Tamil Nadu India

The dry sliding wear behavior of AA6061 matrix composite reinforced with aluminium nitride particles（AlN） produced by stir casting process was investigated. A regression model was developed to predict the wear rate of the prepared composite. A four-factor, five-level central composite rotatable design matrix was used to minimize the number of experimental runs. The factors considered in this study were sliding velocity, sliding distance, normal load and mass fraction of AlN reinforcement in the matrix. The developed regression model was validated by statistical software SYSTAT 12 and statistical tools such as analysis of variance（ANOVA） and student＇s t test. It was found that the developed regression model could be effectively used to predict the wear rate at 95% confidence level. The influence of these factors on wear rate of AA6061/AlNp composite was analyzed using the developed regression model and predicted trends were discussed with the aid of worn surface morphologies. The regression model indicated that the wear rate of cast AA6061/AlNp composite decreased with an increase in the mass fraction of AlN and increased with an increase of the sliding velocity, sliding distance and normal load acting on the composite specimen.

关键词： aluminium matrix composite particle-reinforcement wear regression model