Browsing by Author "Muhammad Hamza Butt"

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    Analytiacal Assessment of pedistrian indused vibration in foot brigde
    (UMT. Lahore, 2024) Muhammad Hamza Butt; Ch Fahad Ul Islam; Abdul Hanan; Nadir Shah
    Slender designs have been used to build pedestrian bridges that cross over extensive roadways, incorporating today’s technologies and materials. Efficient and streamlined designs of pedestrian bridges lead to changes in their functionality and maximum capacities, which in turn give rise to the problems such as structural vibrations. In pedestrian bridges, this event arises when the default structure’s frequency correlates to the frequencies at which the load induces excitation. In this study, an analysis of impact of live load on an existing pedestrian bridge using a STAAD.Pro has been performed. The structure under investigation is derived from a pedestrian bridge situated in the city of Lahore, Pakistan. Vibrational problem of the bridge necessitated an analysis of characteristics and behaviour using an analytical model. Six natural frequency modes of the bridge were examined through simulation by finite element method. 1.7 Hz to 3 Hz range frequency was observed which was below the prescribed minimum natural frequency. The results unequivocally demonstrated that the pedestrian bridge is susceptible to high vibration levels, which can jeopardize the comfort-limit state of the users. The retrofitting was done to modify and strengthen the existing structure. Results of the strengthened structure revealed that the frequency values ranged from 3.5 Hz to 11.7 Hz for six different frequency modes. These frequencies are considered appropriate for a pedestrian bridge according to the natural frequency conditions.