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What are the advantages of piers constructed monolithically with the bridge deck over usage of bearings?

Saad Iqbal | 🗓️ Modified: May 27, 2016 | ⏳ Read Time: 1 min | 👁 Post Views: 650

Published on: May 27, 2016 by Saad Iqbal

Basically, piers constructed monolithically with the bridge deck are advantageous in the following ways:(i) Movement of the bridge deck is achieved by the bending deformation of long and slender piers. In this way, it saves the construction cost of bearings by using monolithic construction between bridge deck and piers. Moreover, it is not necessary to … Read more

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Are diaphragms necessary in the design of concrete box girder bridges?

Saad Iqbal | 🗓️ Modified: May 27, 2016 | ⏳ Read Time: 1 min | 👁 Post Views: 614

Published on: May 27, 2016 by Saad Iqbal

Diaphragms are adopted in concrete box girder bridges to transfer loads from bridge decks to bearings. Since the depth of diaphragms normally exceeds the width by two times, they are usually designed as deep beams. However, diaphragms may not be necessary in case bridge bearings are placed directly under the webs because loads in bridge … Read more

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What is the advantage of sliding bearings over roller bearings?

Saad Iqbal | 🗓️ Modified: May 27, 2016 | ⏳ Read Time: 1 min | 👁 Post Views: 518

Published on: May 27, 2016 by Saad Iqbal

In roller bearing for a given movement the roller bearing exhibit a change in pressure centre from its original position by one-half of its movement based on David J. Lee. However, with sliding bearing a sliding plate is attached to the upper superstructure and the moving part of bearing element is built in the substructure. … Read more

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What is escalator? How Escalators Work? [VIDEO]

Saad Iqbal | 🗓️ Modified: May 27, 2016 | ⏳ Read Time: 1 min | 👁 Post Views: 651

Published on: May 27, 2016 by Saad Iqbal

An escalator is a type of vertical transportation in the form of a moving staircase – a conveyor transport device for carrying people between floors of a building. The device consists of a motor-driven chain of individually linked steps that move up or down on tracks, allowing the step treads to remain horizontal. Escalators are … Read more

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Why is the span length ratio of end span/approach span to its neighboring inner spans usually about 0.75?

Saad Iqbal | 🗓️ Modified: May 27, 2016 | ⏳ Read Time: 1 min | 👁 Post Views: 587

Published on: May 27, 2016 by Saad Iqbal

From aesthetic point of view, an odd number of spans with a decrease in length in the direction of abutment is desirable. Moreover, spans of equal length are found to be boring. However, the arrangement of irregular span lengths is not recommended because it gives a feeling of uneasiness. From structural point of view, for … Read more

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