Abstract
This paper summarizes new application of CFS in bridge constructions where a seven meters long pedestrian bridge was constructed. The bridge has 1.2m width, 0.8m depth, and is composed of CFS Warren truss and bondek floor systems. Natural frequency of the bridge considering only dead load application was found as 8.54 Hz and decreased to 7.08 Hz when the live load was included. Under static load test, the application of dead load only and both dead and live loads yielded a maximum deflection of 3.53 and 8.1 mm, respectively. Normal walking and running pedestrian loads were carried out created a maximum acceleration equaled to 0.11g. Lastly, sinusoidal waves application facilitated through a three-phase induction motor having self-weight of 24.86 kgf at frequency equal to 8.5 Hz was performed for one hour resulting no decrease of the natural frequency, thus the bridge can be assumed to experience no noticeable stiffness degradation.
Highlights
Cold formed steel (CFS) has been successfully replaced timber as the main material of roof structures of buildings or housings in Indonesia
Light weight construction and high tensile strength are the two most important factors when CFS is intended to be used for bridge constructions, such as truss-deck elements
Bridge acceleration corresponds to the first natural frequency was found equaled to 0.064g
Summary
Cold formed steel (CFS) has been successfully replaced timber as the main material of roof structures of buildings or housings in Indonesia. This is because of some important advantages offered by CFS, such as: lightness in weight, uniform quality, economy in transportation and handling, fast and easy erection as well as installation, and termite-proof [1]. Addition of corrosion-proof layer during CFS production [4] has substantially minimized construction maintenance activities during service and this is another important concern for buildings engineers or users. Light weight construction and high tensile strength are the two most important factors when CFS is intended to be used for bridge constructions, such as truss-deck elements. High axial compression forces can be anticipated by forming built-up section such as box-shaped or I-shaped cross-sections built from two single Cshaped cross-sections connected through self-taping screws or bolts
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