Civil Engineering
Permanent URI for this collectionhttps://etd.hu.edu.et/handle/123456789/675
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Item MULTIVARIATE COMPARATIVE ANALYSIS FOR SELECTION OF INTERSECTION CONTROL (CASE STUDY FOR SELECTED UNCONTROLLED INTERSECTIONS IN HAWASSA CITY(Hawassa University, 2019-08-12) ZEMENAYHU BORENA BORSAMOUncontrolled intersections that are found on major road carrying a higher traffic volume generally have traffic safety and operational problems. This is due to the crossing and turning movements at this intersection cannot be satisfactorily managed with existing uncontrolled intersection. At major arterial road intersection with medium and high volume roads where grade separation can‟t be justified traffic would generally be controlled by either signal or roundabouts. The main objective of this thesis is to assess and find out optimum intersection control mechanism from roundabout or signalized intersection for existing uncontrolled intersection of shell and Addisu Menhariya in Hawassa city. These intersections are selected because both are found on major road carrying high traffic volumes (AADT) that justify the introduction of roundabout or signalized intersection based on ERA intersection selection criteria. The methodology that is used for selection is multivariate comparative analysis that uses cost, operational performance and safety performance as evaluation criteria. The traffic, geometric, cost, signal and crash data‟s are collected to make Comparison. Operational performance analyses are made using HCM 2010 methodologies incorporated in SIDRA Intersection software 5.1.The safety performances are measured using mean crash rates and causalities for similar intersection types for years from 2014 to 2018 G.C for millions of entering vehicles to intersections. The costs that are used for comparison are estimated initial costs for alternatives based on current market prices of the city and operational costs that are found using SIDRA Intersection software 5.1.The result show that proposed roundabout and signal intersections will serve LOS C and LOC F with existing traffic condition in both intersections respectively. The summary data indicates that the casualty crash exposure rate at roundabouts in Hawassa city is approximately 19% less than the casualty crash exposure rate of signalized intersections, when averaged across all crash types. The fuel costs and operational cost for roundabout intersection are also lesser than alternative signalized intersection. But the initial cost for roundabout is higher than proposed signalized intersection. Roundabout options are finally recommended for existing uncontrolled intersections of shell and Addisu Menhariya in Hawassa cityItem ASSESSMENT OF PROJECT PERFORMANCE: CASE OF 40/60 SAVING HOUSE DEVELOPMENT ENTERPRISE IN ADDIS ABABA BOLE AYAT LOT II(Hawassa University, 2018-10-22) ALIYA ABDOSH IBRAHIMConstruction industry has complexity in its nature because it contains large number of parties as clients, contractors, consultants and other stakeholders. Construction projects suffer from many problems and complex issues in performance such as cost, time and quality. The aim of this thesis is to identify and evaluate the main factors affecting the performance of construction projects in the case of Bole Ayat 40/60 condominium. Literature reviews about performance were sited to identify the factors affecting the performance of construction projects. The methodology/research design followed was descriptive research. A questionnaire survey was conducted and 44 factors were identified, categorized, evaluated and ranked from small and micro enterprises, client, consultants and contractors perspectives. The results were analyzed and discussed to obtain the most performance indicators. The relative importance index (RII) method was used here to determine perceptions of the relative importance of the performance indicators in construction projects. The extremely significant factors affecting time performance were shortage of material, financial problem and poor communication and coordination with RII 0.75, 0.74 and 0.71 respectively. Whereas the factors affecting cost performance were fluctuation in the cost of material, lack of cost planning and design change with RII 0.77, 0.693 and 0.691 respectively and factors affecting quality performance were educated and experienced personnel, quality of materials and equipment used in the project with RII 0.81, 0.72 and 0.69 respectively. Recommendations were formulated to improve performance of construction projects. It was concluded that every party participating on the project should have good communication and coordination to avoid design discrepancies and disputes to improve performance; they should have to hire qualified personnel to overcome any technical and managerial problems