Vol. 2 (2026)

Articles

Study on POD Analysis and Reduced-Order Modeling of Fluctuating Wind Pressure on Large-Span Cantilever Canopy Roofs From the Perspective of Spatiotemporal Evolution Characteristics

Published 2026-02-18

  • Yongtao Bai
    • ,
  • Qiteng Zhao

Yongtao Bai
School of Civil Engineering, Chongqing University, Chongqing 400045, China

Qiteng Zhao
School of Civil Engineering, Chongqing University, Chongqing 400045, China

Abstract

This study investigates the spatiotemporal evolution of fluctuating wind pressure on large-span cantilever canopy roofs under complex wind fields. Employing Proper Orthogonal Decomposition (POD), we perform modal decoupling and energy distribution analyses on high-dimensional pressure time-history data from 32 measurement points of a 48m×96m large-span cantilever canopy roof. Results show that the first-order mode displays strong global coherence, contributing 32.41% of the total energy. With increasing mode order, the spatial structure transitions from global patterns to local vortex features; the first ten modes collectively account for 78.11% of the total energy, capturing the edge flow separation and multi-scale vortex shedding behaviors of the rectangular cantilever structure. Signal reconstruction at key windward points verifies that the low-dimensional POD model enhances computational efficiency while preserving the dynamic features of the original flow field, thereby offering theoretical support for wind-resistant design of large-span structures and compression of structural monitoring data.

Keywords

Large-span cantilever canopy roof, Proper orthogonal decomposition, Fluctuating wind pressure field, Spatiotemporal evolution characteristics, Energy distribution characteristics

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