Twin Shape Composed Beam FEA Simulation

Recent years, FRP (Fiber Reinforced Polymer) materials are highly applied in public and industrial pedestrian bridges. It has advantages of rapid installation, light weight, corrosion resistance and convenient maintain to construct bridge with FRP. In this research, Swiss TSCB pedestrian bridge was used as the project background to study TSCB finite elements modeling, structural static properties, failure criteria of carbon fiber layers, vibrating properties and assembling system. The safety and reliability of TSCB can be verified by those FEAs.Firstly, structural static finite elements analysis was simulated in two types of TSCB model. The method of modeling FE model and failure criteria were studied.2D shell model and3D solid model were built respectively. According to Swiss structural design code SIA260/261and end-user requirements, structural deflections were studied under ultimate pedestrian load, ultimate wind load and ultimate snow load. Tsai-Wu failure criteria based on Tsai-Wu tensor theory was used to be the failure criteria determining the failure of carbon fiber layers of sandwich structure. Utilizing this criteria, the carbon fiber failure of TSCB under ultimate pedestrian load was particularly analyzed.The assembling system and connection technology of FRP pedestrian bridge are always the emphasis of study. In this paper, assembling system of TSCB was designed and the3D finite element model with assembling system was built. The structural static analysis under ultimate loads was also simulated in this FE model and the reliability of assembling system was verified.Then the modal analysis was simulated in three types of TSCB FE models above. The first-order vertical modal and first-order lateral modal were particularly studied and the possibility and risk of TSCB resonance leading by pedestrian loads were estimated by considering various countries’design codes, verified the safety and reliability of TSCB on natural vibration. The effect of assembling system on natural frequency and mode shapes of TSCB were verified and the practicality of assembling system was further guaranteed.Through the FEA simulation of TSCB, it proved that this pedestrian bridge was satisfied with the safety design requirements and standards on material strength, structural stability and natural vibration. TSCB pedestrian bridge is a new type FRP bridge with innovation, aesthetics, practicability, module production and rapid installation, provided a high reference value for the design and research of the same type pedestrian FRP bridge.