Response Spectrum Analysis of Reinforced Concrete Frames Having Mass Irregularity
Saba Shamim, Shabi Fatima, Md. Mumtaz Alam, Waseem Ullah Khan, Abdul Hameed Siddiqui
Purpose: Irregularities either in elevation or plan are chief sources of structural collapse during an earthquake. Hence, in zone of high seismicity, these irregular structures are of concern. Therefore, purpose of present study is to investigate the seismic response of reinforced concrete (RC) frames having vertical mass irregularity.
Study design/methodology/approach: A total of five frames having mass irregularities at floor levels two (IF-1), three (IF-2) and four (IF-3) respectively and one simple reference frame (RF) have been considered. Response spectrum analysis has been performed on these models in STAAD pro. Further, extensive parametric studies have been executed to investigate the effect of seismic zone factor and soil category.
Findings : The results have been debated in terms of peak storey shear, lateral displacement and drift ratio and compared with the Indian standard (IS-1893:2016) allowable limits. It has been found that in zone IV and V (soil category I, II and III), drift ratio was pragmatic to be more than the threshold limit. However, drift ratio is enhanced for IF-3 i.e., when mass was present at higher storey level.
Originality/value: In current literature limited research articles on earthquake response of mass irregular buildings can be found. Also, these articles have not yet addressed the influence of parameters such as zone factor and soil category.
Research limitations/implications: Since seismic effect was found to be dominant in x-direction and henceforth discussions have been focused on the results acquired for x-direction only.
Response Spectrum; Mass Irregularity; Storey Shear; Lateral Displacement; Drift Ratio
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Research Articles
Development of Dispute Resolution Framework for Delay Claims in Highway Projects
Smita K. Patil, Sayali Sandbhor, Chaphalkar N. B. and K. R. Patil
Purpose: The growing number of conflicts in highway projects and the subsequent delays in their resolution harm the relationship between the contract's parties and also add to time and expense overruns, which eventually hinder the advancement of the nation. This situation necessitates the creation of a scientific approach to assist the judiciary in monitoring the number of conflicts.
Study design/methodology/approach: This study identified a technique to develop a dispute resolution framework through a case study methodology of the arbitration awards related to Indian highway projects. The top claim category was identified and studied in detail to understand the claimant's contentions, respondents' counterarguments, and rationale for the arbitrators' judgment.
Findings: A root cause analysis led to identification of factors influencing the decisions of the claims raised, which were employed to develop a dispute resolution framework for claims arising due to delays in the late handing over of sites.
Research limitations/implications:The research successfully demonstrates the approach to developing a framework for dispute resolution by detailed analysis of arbitration awards and presents a system for a particular claim category.
Practical implications: The future scope lies in developing system into a commercial offering of a dispute resolution framework for all types of claims, thereby fast-tracking dispute resolutions and reducing the burden on the judicial system to an extent.
Originality/value: The paper develops a dispute resolution framework for delay claims in highway projects which will help the parties to the dispute to predict the outcome of the claims and devise strategies to minimize/eliminate the claims.
Road/Highway projects; Construction Claims; Delay Claims; Construction Disputes; Dispute Resolution; Dispute Resolution Framework Split Tensile Strength (TS)
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Research Articles
Identification of Incinerator Sites for Disposal of BioMedical Waste Using Remote Sensing and Geographic Information Systems: An Indian Case Study
Purpose: Pune and its surrounding regions are witnessing a population growth . The primary reasons for this growth are the opening of newer opportunities in various sectors like IT, Education, or Manufacturing. The growth of urban societies has increased the quantity of Bio-Medical Waste (BMW) generated in hospitals.
Study design/methodology/approach: The methodology includes procuring remotely sensed data i.e. IRS P6 LISS III of the study area i.e. Pune and surrounding regions and utilizing it for landcover classification. The classified satellite image was used along with GIS tools and techniques to identify incinerator sites. Incinerator sites were identified based on the built-up area, network of roads, wind intensity and direction.
Findings: In this paper, two incinerator sites are identified for properly disposing the BMW that is generated from the study area.
Originality/value: The present literature does not consider wind intensity and direction as a selection criterion for identification of incinerator sites. It is an important local parameter to be considered in such kind of study. The present study has selected 56 hospitals in Pune and its adjoining areas.
Research limitations/implications: The limitation of present study includes misclassification of the water bodies. The accuracy assessment of classified landcover map not performed. The study has considered fifty six hospitals only. The study does not categorize hospitals as large or small.
Social Implication: It is highly important to locate a biomedical waste incinerator facility as this has impact on the environment, and also affects the social, and economic aspects. Improperly disposing such waste can severely impact the environment and human health.
Biomedical Incinerator; Bio-Medical Waste (BMW); Remote Sensing; Supervised Classification with Maximum Likelihood Classifier (MLC); GIS
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Research Articles
Strength Behaviour of Quaternary Blended Concrete
V Kiran Kumar , P Srinivasa Rao and T Seshadri Sekhar
Purpose: Recent trends of using high strength concrete/high performance concrete are gaining importance. In making the high-strength/high-performance concrete supplementary cementitious materials (SCMs) are commonly employed to increase strength and durability.
Study design/methodology/approach: The effects of SCMs, when added to quaternary blended concrete are examined in this study. M 65 grade concrete mix was designed and the optimum mix was found to be Flyash at 30%, Metakaolin at 10%, Nano silica at 3% and cement at 60%. For the aforementioned proportion, concrete strength characteristics at different ages. To determine strength behaviour, samples were cast and tested in accordance with the applicable Indian standard code.
Findings: The outcomes of quaternary mixed concrete were compared to cement-only control concrete. The results showed that quaternary blended concrete was superior to control concrete in terms of strength. This enhancement can be associated with the incorporation of SCMs, which resulted in a more dense, more refined microstructure, as well as the compactness of the interfacial transition zone.
Originality/value: Due to increased performance, SCMs which are waste/bi-products of industries, can be employed in highstrength/high performance concrete, reducing the cement content and reducing carbon emissions.
Research limitations/implications: Since flyash which is responsible for later age, Metakaolin and Nano silica was added as they are responsible for the early strength and also improves overall strength. Metakaolin 15 % or more and Nano silica more than 3% reduces the strength as observed in previous researches.
Application of Integrated Fuzzy-AHP and Decision Tree Model for Delay Management in Road Construction Projects
Saurabh Jindal and Indrasen Singh
Purpose : Delay is the greatest impediment to the completion of road construction project. The purpose of this study is to develop a framework to reduce disagreements between the various parties involve in the road construction projects. Its findings can be utilised to improve contractor quality and assist clients in identifying, and analysing the reasons of delays, which will enable industry practitioners in reducing the likelihood of delays.
Study design/methodology/approach : In this study, the outcomes of the expert opinion inquiry for delays are thoroughly examined. Using MultiCriteria Decision-Making (MCDM) methodologies, this study examines the major reasons for delays in road construction projects in India. Through industry responses and interpretation, while utilizing the integrated fuzzy Analytic Hierarchy Process (AHP) and decision tree approach, the study proposes a framework that evaluates and analyses reasons for delays based on the complexity of various risks.
Findings : The findings indicate that the main causes of delays in road construction projects are related to labor, equipment and material, and the owner related, which must be addressed via “performance-based contracting.”
Originality/value: The usefulness of the suggested framework is shown through the application in road construction projects. It develops the insight to visualize the potential risks that may cause delays and decision alternatives to resolve issues. This study have the potential to effectively manage road construction delays.
Research limitations/implications: This study has two limitations: one is the subjectivity of expert responses, and other is the focus on only local causes of road construction delays in India's Konkan region.
Research & Publications Department 