A lot of assumptions,simplifications and approximations are made in the deterministic design of structures in the process of substituting a real physical system, whose behaviour is inherently random, with a mathematical model. Resort is therefore often made to the application of safety factors and allowable limits which in reality represent factors... Continue Reading
The minimum weight design problems for three different crosssectional shapes of prestressed concrete transmission poles subject to stress displacement and buckling load restrictions is attempted. The poles are idealized using the class one prestressed conctrete equations. The optimization technique employed for the solution procedure utilizes the v... Continue Reading
Reinforced concrete columns under Small Eccentricity of loading have not been given adequate attention as a class of columns which require its own design method. The present assumption is that current theories on columns which regard eccentricity as a purely flexural parameter, are adequate for the design of this class of columns. The result is tha... Continue Reading
The suitability of Crumb Rubber (CR) to partially modifying bitumen in Asphalt Emulsion production for use as slurry seal was investigated. Bitumen was replaced with 0%, 5%, 10%, 15%, 20% and 25% Crumb Rubber, and subjected to methyl blue, sand equivalency, cohesion, wet track abrasion (WTA) and loaded wheel tracks (LWT) tests. Preliminary tests: u... Continue Reading
A time-based concept which provides a quantitative means for estimating the plant water stress imposed on a crop during its growing season to provide a criterion for characterising the need for irrigation is presented, based on the stress -Day Index (SDI) concept. Wheat (Triticum aestivum L.) was used as the experimental crop, at the Ahmadu Bello U... Continue Reading
Water resource designs based on flood are perfect examples of decisions under uncertainty. Three types of uncertainties may exist in a flood design problem - when the classical method is used. These are natural, parameter and model uncertainties. To reduce the parameter and model uncertainties, the Bayesian procedure has been used. Three common pro... Continue Reading
Efficient Handover mechanism in a GSM network is one of the parameters critical to GSM network service quality (QoS) and customer satisfaction. Handover is the process that transfers an ongoing call from one cell to another as the users move through the coverage areas of the cellular systems. This research focuses on analyzing and optimizing interc... Continue Reading
Pollution of water, especially in communities close to crude oil deposits and refineries, has created worldwide concerns because of the associated heavy metals, inter-alia, released to the environment which have adverse effects on the environment - human and aquatic life. Despite all the efforts of the refineries to curtail this, the inorganic poll... Continue Reading
A computer program for the design of reinforced concrete shallow foundations is presented. The choice of the type of foundation is made interactively with the computer based on experience in design decisions. The computer program developed was used to design reinforced concrete foundations such as pads, combined, strip and raft footings that had be... Continue Reading
This work addresses the question of the method of accounting for loses due to all the injury levels for all persons involved in road accidents and the costs of specific accident types. By assuming that fatalities in road accidents lead to a permanent loss in the economy that is not replaced and by accounting for all lost outputs and damages from ac... Continue Reading
The results obtained from the investigation of the effect of cement and time on the properties of laterite soil with respect to the elapse time after mixing as well as the compactive energy levels (Proctor and West African) are highlighted. The material was classified as an A-7-6 soil according to AASHTO classification system and was treated with 0... Continue Reading
This study was carried out to estimate direct recharge in the Sokoto-Rima river basin, Nigeria, using a soil moisture deficit model. Thereafter, the sensitivity of the model to input and model parameters was investigated. The mean annual recharge for the study period was found to be 255.0mm. The incidence of recharge was validated by comparison of ... Continue Reading
A study of the properties of sandcrete hollow block 1s important since they are widely used in the construction industry. An understanding of these properties is essential if blocks are to be used effectively., These properties have an important bearing on the appropriate application of the products and on the precautions to be taken to ensure thei... Continue Reading
The ordinary U-stirrups have always been used especially in beams as web reinforcement in most modern construction. As a probable substitute, here wire wesh of 3mm diameter is used to reinforce beams in shear. The investigation thus involves testing of beams reinforced in shear separately with the ordinary U-stirrups and with wire mesh. The beams a... Continue Reading
In this study, a physical hydraulic model investigation was conducted to evaluate the performance of a stepped overflow spillway. The spillway has a standard ogee profile with continuous steps cut into the spillway weir down�”stream face just below the crest to the toe. The experiment was carried out on three models of the spillway weir, two of th... Continue Reading