Master of Engineering in Construction Management
http://dl.lib.uom.lk/handle/123/94
2024-03-28T20:13:11ZUse of estimating data for construction planning.
http://dl.lib.uom.lk/handle/123/13766
Use of estimating data for construction planning.
Chandrapalan, S
Use of estimating data for construction planning.; Engineering and building projects, the elementary task is estimating the cost and time duration required for the project. This process extends from the promoter to the designer, the consultant supervisor and ultimately to the contractor, designer is The estimate done by the estimate of the project; the estimate carried out by the consultant is an called the engineer's estimate and the estimate of the contractor is the bid for the work. The actual cost and time taken is only known certainty only at the final completion of which is either very closer to the estimate the project, or with the considerable deviation. But this determining the finance, time duration and other required for the project. process is vital in resources As this estimate governs the full scope of work, it is essential to determine in greatest possible accuracy in a specific time period. This is carried out in different stages in determining various requirements of the project.
Review of roundabout design parameters and development of a roundabout design guideline for Sri Lanka
http://dl.lib.uom.lk/handle/123/12177
Review of roundabout design parameters and development of a roundabout design guideline for Sri Lanka
Ekanayake, EMCB
Review of Roundabout Design Parameters and Development of a Roundabout
Design Guideline for Sri Lanka
Roundabouts are frequently used in urban areas in Sri Lanka. There is no proper guideline to
design roundabouts in Sri Lanka. Increasing traffic and use of long vehicles resulted in
malfunctioning some of the roundabouts. Geometry of roundabout has great influence on
operation of the roundabouts.
Objectives of the study are to review the roundabout design guidelines, identify the issues in
existing roundabouts and formulate a roundabout design guideline for Sri Lanka.
Five major design guidelines were considered to compare the design parameters of
roundabout geometry. Twenty four roundabouts spread over major cities were selected for
study. Main geometric parameters of each roundabout were collected using field
measurements and calibrated satellite images. Standards of local roundabouts were compared
with the international roundabout guidelines. Swept path analysis was carried out on selected
roundabout layout for single unit truck to determine the adequacy of entry width, circulation
width, exit width and operational speed. Design parameters that need to be improved on
existing roundabout were identified and suitable values for selected design parameters were
proposed.
Influence of linings on stress and deformation in rock around elliptical tunnels
http://dl.lib.uom.lk/handle/123/10350
Influence of linings on stress and deformation in rock around elliptical tunnels
Gunatilaka, IRP
Stress and deformation behavior in rock surrounding elliptical tunnels with concrete liners is investigated by finite element analysis. The loading condition is limited to hydrostatic pressure applied inside the tunnel and it is assumed that the constitutive behaviors of both rock and concrete are according to isotropic linear elasticity. Plain strain conditions are assumed to prevail for the tunnels, which is the case when tunnels with straight axis in uniform rock media are considered. Three elliptical tunnel geometries with major to minor axis ratios of 1.156, 1.358 and 1.500 are considered for the study. Each problem geometry was analysed for liner thickness varying from 0.0 m (unlined case) to 1.0 m in steps of 0.2 m, assuming that the Young's Modulus for rock is 1/10th of that of concrete. The result for stress and deformation are presented for the rock domain, both in tabular and graphical forms. These numerical results illustrate the effect of concrete liner thickness and tunnel geometry on stress and deformation in rock. A limited parametric study is conducted by varying the Young's Modulus of rock for a selected tunnel geometry with a concrete liner thickness of 0.2 m. The present research makes a significant contribution to tunnel engineers, providing numerical tools to arrive at an optimum tunnel geometry and liner thickness, by striking a balance between cost and efficiency.
2014-08-01T00:00:00ZPre-tender planning for the Sri Lankan construction industry
http://dl.lib.uom.lk/handle/123/10243
Pre-tender planning for the Sri Lankan construction industry
Wijaratna, C
Many clients and consultants in Sri Lanka believe that bad planning ( including pre-tender planning) is one of the main reasons for poor performance by local contractors. Construction contractors too, do not deny that their planning is inadequate. it is observed that, due to high competition and other factors, price war in tendering is common and many contractors do not try to develop specialised skills. As such, it was decided to study pre-tender planning procedures adopted by local contractors and compare with recommended practice, in order to propose a suitable pre tender planning procedure for the local industry. Books and journals were refered to, in order to find out, the circumstances that lead the local industry to this situation and learn good practice in overall planning and pre-tender planning is particular. A questionnaire survey was conducted among contractors. To supplement this seven consultants were interviewed using a separate questionnaire as a guide. This research lead to conclude construction contractor most of the time make decision on their intuition and experience. Their information system are not developed, and they do not have a long medium term business plan except for a few grade I and II who make an attempt for it. Tender periods are comparatively short and tender documents are generally not complete in all respects. It is recommended that. contractors should be market oriented and plan their business·, based on scientific · analysis of business environment and develop professional approach for pre-tender planning. Consultants;should help contractors by providing more accurate' and'complete tender documents, and sufficiently long period for tendering
2014-07-09T00:00:00Z