Browsing by Author "Rubaratuka, Ignas A."
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Item Application of Non-Destructive Testing in Evaluating Reinforced Concrete Structural Elements in Buildings(2008) Rubaratuka, Ignas A.; Ndumbaro, P.Of recent a large nllmber of existing rei"forced concrete bllildings have reqllired reconstruction, renovation and improvement. This tendency poses a "w"ber of problellls that have to be solved, the main aile being to determine the actual strength condition of the structural components/elements of the bllilding. It includes determ inatioll of the quality of materials used, specificatiol/ orthe types (/I/d description of apparent fa II Its and damages and extent of wear of the bllilding. To undertake this evaluation, non - destructive testing methods are IIsed. In this paper, applications of lion - destructive testing methods to determine the strength state of reinforced concrete colllll1ns with corbels and to establish their structural strength so as to deterl7line the capacity of a mobile crane to be installed is olltlined.Item Assessment of the Accuracy of Approximate Methods in the Analysis of Plane Frame Structures(2004) Rubaratuka, Ignas A.Item Challenges of the Quality of Reinforced Concrete Buildings In Dar es Salaam(International Journal of Engineering Research & Technology, 2013-12-13) Rubaratuka, Ignas A.In Dar es Salaam, most of the buildings are constructed using reinforced concrete due to non ? availability of other durable materials and the strength and protection concrete provide against aggressive weather conditions. Despite of these advantages, still reinforced concrete constructed buildings in Dar es Salaam are facing quality problems which are mainly caused by lack of national building codes and standards, design deficiencies such as lack of design details and accuracy, unsatisfactory quality of concrete ingredients, inappropriate construction technology, lack of quality control measures and inadequate supervision on construction sites.Item Corrosion Control of Steel Reinforcement in Reinforced Concrete Buildings: a Case Study in Dar es Salaam(2011) Rubaratuka, Ignas A.Item Defects in Reinforced Concrete due to Environmental Conditions and Concrete Treatment: a Case Study at the University of Dar es Salaam(1999) Rubaratuka, Ignas A.; Mulungu, D.Item Design Considerations for Blast Resistant Commercial/Civilian Buildings(2009) Rubaratuka, Ignas A.Item Dynamic Analysis of Forced Non-linear Oscillations in Mechanical Systems(1997) Rubaratuka, Ignas A.Item Dynamic Stability of Forced Non-linear Oscillations in Mechanical Systems(1999) Rubaratuka, Ignas A.Item Item Importance of Planned Maintenance Systems for Buildings(1997) Rubaratuka, Ignas A.Item Importance of sPStructural Fire Protection in Reinforced Concrete Buildings: A Case Study of Ex- NASACO Building(2004) Rubaratuka, Ignas A.Item Improving Adobe Building Construction in Tanzania(2012) Rubaratuka, Ignas A.Adobe in the form of sun dried bricks and clay mortar is still one of the primary building construction material in Tanzania especially in rural areas due to its low cost, availability and affordability. Investigations carried out in some regions of Tanzania revealed that, despite this extensive use, adobe constructed buildings have some major shortcomings, which include its heavy weight, low material strength, cracking and lack of proper connections between the main load – carrying elements of the buildings. Therefore, in order to improve the performance of adobe building constructions, there is a need to provide an overall binding system in the form of wood acting as ring beams supported by vertical elements, that would prevent walls from falling out of their planes, plaster the walls externally to minimize the action of rainwater, provide strong foundations such as stone made foundations with damp proofing material applied between it and the walls and avoid adobe made flat roofs.Item Influence of Formwork Materials on the Surface Quality of Reinforced Concrete Structures(EAAS, 2013) Rubaratuka, Ignas A.Formworks made from different materials are used for concrete works to hold the concrete in place until it hardens sufficiently to form the desired shape. It has been a practice to specify the type of formwork to be used basing on the availability of formwork materials, cost, safety during construction and sometimes on the surface quality of the finished product without considering the formwork influence on the surface strength and durability of concrete. In this manuscript, investigation results on the influence of formwork materials on the quality of surface concrete are presented. It has been established that the rate of water absorption of formwork materials among other factors has an influence on the concrete strength. Further, it is being recommended to use formworks which can absorb water from the concrete surface so as to increase the strength of concrete at the surface and hence the durability of concrete structural members.Item Introduction of Seismic Resistance Features in the Construction of Buildings in Tanzania(2004) Rubaratuka, Ignas A.Item Investigation of Provisions of Fire Safety Measures in Buildings in Dar es Salaam(EAAS, 2013-10) Rubaratuka, Ignas A.One of the major causes of damage/destruction of constructed facilities in particular buildings in Tanzania is fire. Of recently, several cases of fire outbreaks have caused serious destruction to buildings and other properties especially in Dar es Salaam. It is well known that fire damages can be significantly reduced if appropriate fire prevention and protection measures are taken into account during the design and construction stages of buildings. In this manuscript, therefore, observations and results of investigation carried out to determine the provisions of fire safety measures in the design and construction of buildings in Dar es Salaam are presented. It has been established that in some of the buildings investigated, fire safety measures have not been adequately provided and in case of fire outbreaks serious damages are likely to occur.Item Load Test for the Fire Gutted Nasaco Building(1997) Rubaratuka, Ignas A.; Mpinzire, S.; Makunza, J. K.Item New Frontiers in Engineering Education and Practice(2010-03-01) Rubaratuka, Ignas A.; Oyawa, W. O.Item Numerical Investigation of Bifurcation of Steady Oscillations in Shallow Plates(1998) Rubaratuka, Ignas A.; Isakhanov, G. V.Item Quality Control in the Construction of Reinforced Concrete Buildings in Dar es Salaam(2008) Rubaratuka, Ignas A.Quality Control in the construction industry is very important to ensure that what is being done conforms to the applicable standards or good practice and the contract documents. In this article, results of investigations conducted at different construction sites for reinforced concrete buildings in Dar es Salaam to check if quality control measures are being implemented are discussed. It has been established that generally quality control is not properly carried out. Finally, measures to enhance quality control on sites are outlined.