PEDESTRIAN BRIDGES: STRUCTURAL FORMS AND DESIGN ISSUES

Abstract

In this report, studies on pedestrian bridges- structural forms and design issues is carried out. The studies are carried out with the help of SAP 2000 and SȆTRA 2006. Effect of movement of pedestrians is understood in vertical and lateral direction. Validation of a warren type steel footbridge and parametric study of curved cable stayed bridge is done using SAP 2000. For different loading conditions frequencies and accelerations are determined and chances of resonant conditions prevails or not is determined based on values obtained from SAP 2000 apart from this dynamic analysis of wind is done on curved cable stayed bridge. For warren type steel footbridge two conditions are being assumed first in which bridge is in design phase and second when bridge is in existing phase. Based on these conditions certain modifications have been done in bridge so that chances of resonant condition won’t occur. For this the depth of bridge is increased, application of cable is used and concept of TMD is implemented on existing bridge to reduce the frequency and acceleration of bridge. Then comparison has been made between various modifications for chances of resonant condition based on frequency and acceleration criteria. For curved cable stayed bridge 6 different models are compared based on different paraments like maximum deflection in deck, cable tension developed, axial force, moment, torsion developed in deck and pylon and maximum acceleration induced in deck due to pedestrian movement using SAP 2000 and dynamic analysis has been performed for wind induced vibration for which different codes has been referred which are IRC 6:2017, SȆTRA 2006, Eurocode EN 1991 -1 -4. Also, the effect of change in material on maximum acceleration due to pedestrian movement is studied on both truss type and curved cable stayed footbridge for which further studies for remedial measure to reduce acceleration in footbridge will be done in future.