Question

The proposed masonry arch bridge having the total height of its abutments or piers from top to bottom as H can be proposed to have economical spans each equal to ______

(a) 2/3 H

(b) 2H

(c) 1.2 H

(d) 1.5 H

I had been asked this question by my college professor while I was bunking the class.

My question is taken from Small Road Bridges Construction in chapter Culverts and Small Road Bridges Construction of Irrigation Engineering

Answer 1

The correct option is (b) 2H

To elaborate: As per the guidelines, the economical length of one span for masonry arch bridge is equal to 2H where H is the total height between the bottoms of the foundations to its top. The clear span length is equal to 1.5H for RCC slab bridges.