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In Civil Engineering (Bridge Design), The design of a simply supported skew bridge, which direction of reinforcement should be provided?

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تم إضافة السؤال من قبل Muhammad Shakeel , CAD Design Manager , M/S zeeruk Intl.
تاريخ النشر: 2015/02/22

The skew bridge is reinforced by2 sets of rbars as following:-

 place one set of bars perpendicular to the fixed edge while placing the other set parallel to the fixed end as recommended by L. A. Clark (1970). In this way, considerable savings would be obtained from the orthogonal arrangement of reinforcement.

 

Alex Al Yazouri
من قبل Alex Al Yazouri , General Manager , Al Mushref Cooperative Society

In the conventional design of steel reinforcement for a simply supported skew bridge, a set of reinforcement is usually placed parallel to free edge while the other set is designed parallel to the fixed edge. However, this kind of arrangement is not the most efficient way of placing the reinforcement. The reason is that in some parts of the bridge, the moment of resistance is provided by an obtuse angle formed by the reinforcement bars which is ineffective in resisting flexure.

In fact, the most efficient way of the arrangement of reinforcement under most loading conditions is to place one set of bars perpendicular to the fixed edge while placing the other set parallel to the fixed end as recommended by L. A. Clark (1970). In this way, considerable savings would be obtained from the orthogonal arrangement of reinforcement.

Muhammad Shakeel
من قبل Muhammad Shakeel , CAD Design Manager , M/S zeeruk Intl.

Agreed with all experts good answer from all of you, thanks for sharing the knowledge. 

Elke Woofter
من قبل Elke Woofter , Project Assistant , American Technical Associates

I found the same answer than Mr. Alex Yazouri on Posted in Bridge Engineering and therefore have to agree with the  answers already given

Wolf Klaas Kinsbergen
من قبل Wolf Klaas Kinsbergen , Managing Director, Designer , ingenieursbureau KB International NV

A skew bridge gets the normal rebar based on mechanics , but don't forget the torsion rebar! And also the check shear combined with torsion

Lateef Fadun CPEng PMP
من قبل Lateef Fadun CPEng PMP , subcontractor

As a rule of thumb, there will be moment spanning in  both orthogonal directions on the bridge. Consequently, rebars are needed in both spans.The more the moment, the more the flexural rebars needed.

The torsion and the shear will also be checked as earlier mentioned. I'll be surprised if you ever find a one way spanning reinforced concrete bridge deck! The weight and size would make that impossible.

Rakesh S
من قبل Rakesh S , Structural Engineer , Royal Engineering Consultants, Sharjah, UAE

Flexural Main bars in long direction and secondary in opposite direction.

Mohamed Helal
من قبل Mohamed Helal , Project Manager , GROUP CONSULT INTERNATIONAL

Thanks for invitation....I endorse Experts answers

Petar Stojanovic
من قبل Petar Stojanovic , Assistant Professor , TU Delft

Skew bridge has oblique arc and that means that it reinforces the vertical powers.

Gohar Rehman
من قبل Gohar Rehman , Quantity Surveyor , Frontirr Works Organization (FWO)

Main Bars at normal width and distribution bars at skew length

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