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Design of steel footbridges for unpredictive loadings by STAAD Pro: LRFD vs. ASD for cost saving

Naeem Armghan, Muneeb Muhammad, Yousaf Asad, Naeem Muhammad Mohtasham

Computer Assisted Methods in Engineering and Science

2021

Vol. 28, no. 4

351--367

Steel footbridges are common means of connecting two zones separated by any kind ofphysical obstruction to the pedestrian crossing. In the last century, they were mostlydesigned using manual calculations. With the advent of powerful software, the design-ing process has become more accurate and less time-consuming. In this paper, completedesigning process of steel footbridges is conducted using STAAD Pro: a dedicated steelstructure design and analysis software, under unpredictive loading, i.e., dead, live, pedes-trian, wind and seismic loading. Two design approaches are popular in steel footbridgesdesigning. These are allowable stress design (ASD) and load and resistance factor design(LRFD), and both are compared with the focus on material/cost saving as cost is the ma-jor issue in underdeveloped and overpopulated countries. The critical load combinationgiving a minimum factor of safety for both approaches is also obtained. It is evaluatedthat the LRFD design approach results in stronger and lighter structures for unpredictiveloadings. The factor of safety for ASD is 20% lower than that of LRFD, and thus LRFDprovides material/cost savings of about 20% compared to ASD.