NED University Journal of Research最新文献_第3页

SHAKING TABLE TESTS ON HAUNCH RETROFITTED REINFORCED CONCRETE FRAMES 后腿加固钢筋混凝土框架的振动台试验

NED University Journal of Research Pub Date : 2019-12-12 DOI: 10.35453/nedjr-stmech-2019-0034

J. Akbar, N. Ahmad, B. Alam

{"title":"SHAKING TABLE TESTS ON HAUNCH RETROFITTED REINFORCED CONCRETE FRAMES","authors":"J. Akbar, N. Ahmad, B. Alam","doi":"10.35453/nedjr-stmech-2019-0034","DOIUrl":"https://doi.org/10.35453/nedjr-stmech-2019-0034","url":null,"abstract":"Shaking table tests were performed on five one-third reduced scale two storey reinforced concrete (RC) moment resisting frames having construction defects (using low strength concrete without confining ties in beam-column joints, larger tie spacing, and reduced longitudinal and transverse reinforcements). The deficient frames were observed to have severe joint damageability, resulting in joint panel cover spalling and core concrete crushing. Haunch retrofitting technique was adopted to upgrade the seismic behaviour of deficient RC frames. Additional four deficient RC frames were built and retrofitted with steel haunch; both axially stiffer and deformable with energy dissipation, fixed to the beam-column connections to reduce shear demand on joint panels. The as-built and retrofitted frame seismic response modification factor (R) was calculated and compared to evaluate the viability of the haunch retrofitting technique. The haunch retrofitting technique increased the lateral stiffness and strength of the structure, resulting in the increase of structure overstrength. The retrofitting increased R factor by sixty percent to one hundred percent. The presented results indicate that the technique can significantly enhance the seismic performance of deficient RC frames, particularly against the frequent and rare earthquake events.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124119590","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

POWER SYSTEM STATE ESTIMATION USING A ROBUST ESTIMATOR 基于鲁棒估计器的电力系统状态估计

NED University Journal of Research Pub Date : 2019-09-02 DOI: 10.35453/nedjr-ascn-2018-0038

Z. Khan, Katrina Lane Krebs, Sarfaraz Ahmad, Misbah Munawar

引用次数: 0

INVESTIGATION OF EFFECTS OF DIELECTRIC TYPE AND POLARITY ON ELECTRIC DISCHARGE MACHINING OF AISI D2 STEEL USING RESPONSE SURFACE METHODOLOGY 用响应面法研究电介质类型和极性对aisi d2钢电火花加工的影响

NED University Journal of Research Pub Date : 2019-09-02 DOI: 10.35453/nedjr-ascn-2018-0029

Muhammad Hanif, W. Ahmad, S. Hussain, M. Jahanzaib

引用次数: 1

QUANTITATIVE CRITERIA FOR VALIDATION OF ELECTROENCEPHALOGRAM NEUROFEEDBACK TRAINING PROTOCOL: A PILOT STUDY ON NEUROPATHIC PAIN 脑电图神经反馈训练方案验证的定量标准:神经性疼痛的初步研究

NED University Journal of Research Pub Date : 2019-09-02 DOI: 10.35453/nedjr-ascn-2017-0040

M. Hasan, M. Fraser, S. A. Qazi

引用次数: 0

SMART IDENTIFICATION OF POWER QUALITY EVENTS USING NEW STOCKWELL TRANSFORM AND MACHINE LEARNING ALGORITHM 基于新stockwell变换和机器学习算法的电能质量事件智能识别

NED University Journal of Research Pub Date : 2019-09-02 DOI: 10.35453/nedjr-ascn-2018-0006

Muhammad Tariq, Tahir Mehmood

{"title":"SMART IDENTIFICATION OF POWER QUALITY EVENTS USING NEW STOCKWELL TRANSFORM AND MACHINE LEARNING ALGORITHM","authors":"Muhammad Tariq, Tahir Mehmood","doi":"10.35453/nedjr-ascn-2018-0006","DOIUrl":"https://doi.org/10.35453/nedjr-ascn-2018-0006","url":null,"abstract":"Accurate detection, classification and mitigation of power quality (PQ) distortive events are of utmost importance for electrical utilities and corporations. An integrated mechanism is proposed in this paper for the identification of PQ distortive events. The proposed features are extracted from the waveforms of the distortive events using modified form of Stockwell’s transform. The categories of the distortive events were determined based on these feature values by applying extreme learning machine as an intelligent classifier. The proposed methodology was tested under the influence of both the noisy and noiseless environments on a database of seven thousand five hundred simulated waveforms of distortive events which classify fifteen types of PQ events such as impulses, interruptions, sags and swells, notches, oscillatory transients, harmonics, and flickering as single stage events with their possible integrations. The results of the analysis indicated satisfactory performance of the proposed method in terms of accuracy in classifying the events in addition to its reduced sensitivity under various noisy environments.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131440167","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

A RESOURCE OPTIMISATION BASED HEURISTIC FOR RESOURCE CONSTRAINED PROJECT SCHEDULING PROBLEM 基于资源优化的启发式算法求解资源约束项目调度问题

NED University Journal of Research Pub Date : 2019-09-02 DOI: 10.35453/nedjr-ascn-2018-0092

Mazhar Ali, Saif Ullah, M. Jahanzaib

引用次数: 0

SEISMIC RETROFIT OF NONDUCTILE REINFORCED CONCRETE FRAME AND MASONRY BUILDINGS 非延性钢筋混凝土框架和砌体建筑的抗震加固

NED University Journal of Research Pub Date : 2019-07-01 DOI: 10.35453/NEDJR-STMECH-2019-0009

M. Saatcioglu

{"title":"SEISMIC RETROFIT OF NONDUCTILE REINFORCED CONCRETE FRAME AND MASONRY BUILDINGS","authors":"M. Saatcioglu","doi":"10.35453/NEDJR-STMECH-2019-0009","DOIUrl":"https://doi.org/10.35453/NEDJR-STMECH-2019-0009","url":null,"abstract":"A large proportion of existing building and bridge infrastructure across the world consists of seismically deficient non-ductile structural systems. Performance of structures during recent earthquakes have demonstrated seismic vulnerability of these systems, the majority of which were designed prior to the enactment of modern seismic codes, though some were designed more recently in areas where code enforcement provides challenges. These structures constitute considerable seismic risk, especially in large metropolitan centres. Because it is economically not feasible to replace a large segment of seismically deficient infrastructure with new and improved systems, retrofitting existing structures remains to be a viable seismic risk mitigation strategy. The objective of this paper is to highlight seismic retrofit strategies for deficient building and bridge infrastructures, with emphasis on experimental and analytical research conducted at the University of Ottawa. The retrofit strategies consist of structural upgrades at the system level, as well as at the element level. Non-ductile reinforced concrete frame retrofits, in the form of lateral bracing techniques, and concrete column and masonry wall retrofit methodologies are discussed. The use of innovative materials and techniques are presented.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122722862","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

GEOPOLYMER CONCRETE AT AMBIENT AND ELEVATED TEMPERATURES: RECENT DEVELOPMENTS AND CHALLENGES 环境和高温下的地聚合物混凝土:最近的发展和挑战

NED University Journal of Research Pub Date : 2019-07-01 DOI: 10.35453/NEDJR-STMECH-2019-0007

Z. Tao, Z. Pan

{"title":"GEOPOLYMER CONCRETE AT AMBIENT AND ELEVATED TEMPERATURES: RECENT DEVELOPMENTS AND CHALLENGES","authors":"Z. Tao, Z. Pan","doi":"10.35453/NEDJR-STMECH-2019-0007","DOIUrl":"https://doi.org/10.35453/NEDJR-STMECH-2019-0007","url":null,"abstract":"Geopolymer concrete (GPC) is attracting increasing attention due to its potential to replace ordinary Portland cement (OPC) concrete to reduce the carbon dioxide emissions from cement production. Although extensive research has been conducted in this area since the 1970s, its applications in engineering practice are still very limited. This paper briefly reviews the recent developments of GPC and its properties at ambient and elevated temperatures. It was found that GPC generally exhibits comparative properties to OPC concrete at ambient temperature. In contrast, GPC often has better fire performance and superior durability. Therefore, GPC could be advantageously used to improve the fire performance and durability of buildings and infrastructure. While a lot of aluminosilicate raw materials (such as fly ash) are low cost, the prohibitive costs of laboratory grade activators (such as sodium hydroxide and sodium silicate) greatly limit the widespread application of GPC. Therefore, there is a need to develop low-cost geopolymer concrete. Meanwhile, a few other challenges should also be overcome, such as difficulties to achieve consistent properties and to control efflorescence of GPC. Further research is required at both material and structural levels to address these issues. Particularly, there is a need to develop relevant building codes to promote the use of GPC in practice.","PeriodicalId":259216,"journal":{"name":"NED University Journal of Research","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123450169","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: 14

NEW DIRECTIONS IN STRUCTURAL HEALTH MONITORING 结构健康监测的新方向

NED University Journal of Research Pub Date : 2019-07-01 DOI: 10.35453/NEDJR-STMECH-2019-0006

K. Mosalam, S. Muin, Yuqing Gao

引用次数: 8

SEISMIC VULNERABILITY AND RETROFIT METHODOLOGIES IN MEDIUM-LENGTH REINFORCED CONCRETE BRIDGES 中等长度钢筋混凝土桥梁的地震易损性和改造方法

NED University Journal of Research Pub Date : 2019-07-01 DOI: 10.35453/NEDJR-STMECH-2019-0008

J. Jara, B. Olmos, G. Martinez

引用次数: 0