Arch bridges - Computational Analysis and Design of Bridge Structures - page 268

(a)
(b)
Figure 9.3 Types of arch bridges. (a) Deck arch bridge. (New River Gorge Bridge, http://
en.wikipedia.org/wiki/New_River_Gorge_Bridge.) (b) Half-through arch bridge.
(Chaotianmen Bridge, China, Courtesy of China Communications Construction
Company Ltd.). (Continued)
are tied half-through arch bridges. Although a deck arch bridge can be tied
at the deck level in a similar pattern, a tied deck arch is not commonly used.
When an arch bridge is tied, externally, the whole structure will behave as
a single span of a simply supported girder bridge. The moment distributed
to the arch and tie is related to the stiffness ratio of the arch to tie. A tied-
arch bridge can further be classified as (1) stiffened arch with flexible tie,