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Structural Review Report

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Structural Review Report
CONTENT

1 INTRODUCTION 1
2 LITERATURE REVIEW 2
3 STRUCTURAL REVIEW 7 3.1 General 7 3.2 Evaluation of Beams 7 3.3 Evaluation of the Slab 12
4 STRUCTURAL ANALYSIS FROM STRUCTURAL ANALYSIS SOFTWARE SAP2000 v15.0.0 14
5 RECOMMENDATION 18 5.1 Proposed Modification for the structure 18

INTRODUCTION

Ambatale water treatment plant (Ambatale WTP) is one of the main potable water treatment plant implemented in 1960 and is operated by the National Water Supply & Drainage Board (NWS&DB) in order to serve the population in Greater Colombo Metropolitan area, the capital city of Sri Lanka. This plant is situated approximately 9km east to the Colombo city.
Considering the rapid increase of the potable water demand, this water treatment plant was augmented in three stages to improve its production capacity up to 107.5 MGD. This is about 70% of the total demand of Greater Colombo Metropolitan area. The treated water produced by the Ambatale water treatment plant is transmitted through three high lift pump houses for number of distribution centers located within the Greater Colombo Metropolitan area. Considering the increasing demand of the Kotte area (North-East area of the Greater Colombo Metropolitan), NWS&DB decided to transmit more water through the existing pumping main by installing new pumps at one of the above three pump houses, named as “Jubilee Pump House” which is considered for this study.
This Jubilee pump house was implemented under one of the augmentation done under the funds of third International Development Agency (IDA)in the year 1992. Under this augmentation, four number of centrifugal (vertical turbine type) pumps had been installed. The capacity and weight of the pump motor is1720m3/hr and 1750kg respectively.
Subsequently, in the year 2006, two pumps were replaced by another new two pumps of increased capacity of 1980m3/hr. in order to cater the new water demand of the area. The weight of each motor of the pump is about
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