ON-SITE LOAD EXPERIMENTS AND ANALYSIS FOR A LARGE-SPAN ESCALATOR STEEL TRUSS STRUCTURE
A large-span steel structure truss of the escalator in a shopping mall needed to be tested for deflection and stress in the normal limit state. The horizontal span of the steel truss is 47.9 m, equipping with supports at both ends, which is suspended 35m. A space-leading system is proposed for testing this truss, in which the steel bars are hung at the truss joints, and the basement floor is used as the reaction device that is loaded with the jack. After that, the bearing capacity, overall stability, and local stability of the loading system are checked. To prove that the beam and plate structure would be ripped by the vertical force, SAP2000 finite element software is used to check it. Then, the way of stacking on the floor is designed to balance the force. The on-site load testing results showed that there was no damage to the original basement beam and slab structure. Furthermore, the experiment concluded that the de-flection and stress of the steel truss were consistent with the design.