STRUCTURAL DESIGN OF A REINFORCED CONCRETE SINGLE LANE MOTORIZED BRIDGE AT RIVER NJORO

Abstract

As Kenya’s population continues to increase at an annual rate of 2.7%, there is need to construct more roads to keep up with future demand. Njoro region, being no exception, has experienced this population growth over the years and hence there was need to construct an access road to provide access to the various upcoming market centers as well as homesteads.

 

The proposed access road would cross River Njoro and hence the significance of construction of a single lane reinforced concrete motorized bridge. It was proposed that the bridge be a single lane as the number of homesteads owning cars in the area was minimal and subsequently the traffic volume through the road, ergo bridge, was minimal. 

 

The objectives of this project were to carry out the structural design of a reinforced concrete

bridge in accordance with BS5400 (bridge design) and make detailed drawings and specifications for it.

 

The project was significant in that it would provide access across the river for both motorized and human traffic. Geological, traffic, hydrological and geotechnical surveys were carried out for the best possible location, type and height of the bridge.

 

 The bridge was designed according to recommended (BS5400) standards and sufficient structural capacity to carry the loads at both ultimate and serviceability states and recommendations for maintenance given.

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