e-mosty December 2018 e-mosty December 2018 | Page 65

By industry use they can be divided into four
categories: highway, municipal, railway and other
bridges (such as pedestrian bridges and dock trestles).
Their development and distribution are shown in
Figure 3 below.
Figure 3: Depelopment and distribution of CFST Arch Bridges
2. CHINESE NATIONAL STANDARD TECHNICAL CODE
Specifications of these bridges have been developing
since 1990. Based on engineering research results and
practical experience, The China National Standard
Technical Code for CFST Arch Bridges GB 50923-2013
was edited and published on 11 th November 2013. CFST Arch Bridge Specificaton
It deals with design, construction and maintenance of
CFST Arch Bridges in accordance with the
requirements for safety, reliability, durability and
usability, technical advancement, economy and
rationality. They benefit from the mutual interaction between the
steel tube and the core concrete: the concrete delays
local buckling of the steel tube, while the steel tube
reinforces the concrete core to resist tension stresses
and improve its compression strength and ductility.
Based on Chinese requirements, the Code is expected
to be revised in 2018, and also translated into English. They can be of circular, square or other type of cross-
section. Circular CFST are mostly used due to their
symmetry, resulting good performance and easy
fabrication.
The code applies to the ribs and other structural
components such as hanger cables and tied cables; the
remaining components such as deck system,
abutments and foundations (steel, reinforced
concrete, prestressed concrete or masonry) shall be in
compliance with other relevant national standards.
A CFST arch bridge is defined in the Code as a bridge
whose main load resisting component(s) comprises
typically circular cross-section concrete-filled steel
tube arch rib(s).
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