Computational Analysis and Structural Design for the Rongyao Ring’s Super-Long-Span Single-Side-Opened Circular Structure

The Rongyao Ring is a large-span， circular-connected structure with a diameter of 150 meters， a ring width of 14- 15 meters， a maximum arc span of 135 meters， and a height of 8.6 meters. It is supported by four 46.8-meter-tall towers. The main structure consists of an inverted triangular spatial truss arranged along the inner perimeter， featuring a one-sided cantilever slab and roof. Notably， the outer ring façade remains free of structural components. The structural design employed an integrated calculation model combining the ring and the four towers， incorporating both conventional analysis and nonlinear time-history analysis. Supplemental seismic performance-based evaluations and specialized analyses were conducted， including an assessment of wave-passage effects to ensure structural reliability. Through design optimization during the steel structure detailing and fabrication phases，coupled with rigorous construction scheme verification，the project was completed on schedule. Additionally， considerations such as floor vibration control and health monitoring during the design phase ensured project quality.