The Force Characteristics Of The Steel Footbridge

Due to its large spanning capacity, small beam height, easy access for pedestrians, easy installation, and its strong stability, simple structure, and beautiful appearance, the pedestrian bridge has become the first choice for many cities in recent years. So what are its force characteristics?

Temporary steel bridge flyovers are becoming more and more common in the current pedestrian bridge structure. Its structure is usually composed of upper chord, lower chord, and web members: the web members are generally divided into oblique web members and straight web members. Due to the large span, the "out-of-plane" rigidity of the single-stranded truss is relatively weak, so support needs to be provided "out-of-plane" of the truss. Usually it is generally designed as a truss form outside the plane, so that the steel truss pedestrian bridge forms a whole with good rigidity in both directions. For some steel truss pedestrian bridges, the deck is set on the upper chord so that the force of the structure is mainly transmitted through the upper chord, and some bridge decks are set on the lower chord. In addition, due to the requirement of out-of-plane stiffness, the upper chord still needs to be linked to reduce the out-of-plane calculation length of the upper chord. For rigid truss pedestrian bridges, the chord of the truss is mainly stressed in the attachment of the support in the mid-span part, and the force on the web members in the mid-span part is relatively small, and there is even a theoretical "zero rod". When the rigid truss is actually stressed, given that the members themselves are slender and slender, although the links between the members may be "fixed", the actual bending moments of the rod ends are generally very small, so for the calculation and analysis of steel truss flyovers At the time, the connection between the rods is simplified as "hinge", and the force on the rods is regarded as a "two-force rod", which bears pressure or tension.