Wind - Induced Structural Failures
Shedding beyond ASCE 7
Presented By: Sumanth Cheruku, Pivot Engineers
ASCE 7 wind loads are prescribed on the premise that structures experience little to no aerodynamic effects. However, the structural characteristics that are most susceptible to such behavior are not well discussed, especially for non-building structures. Direct application of these provisions with an incomplete understanding of the inherent limitations led to unexpected failures due to across-wind loading, vortex shedding, or aerodynamic instabilities.
This presentation will examine the aerodynamic phenomena affecting structures, primarily non-building, and describe the system characteristics that prompt catastrophic wind-induced excitations while discussing the underlying structural assumptions in the application of ASCE 7 wind demands to structural design and analysis. Two case studies will be presented: the first will address progressive failure at a utility scale PV solar farm during a below design wind event while the second study will examine conditions leading to vortex shedding from an industrial stack.
Bio: Sumanth Cheruku is an engineer with Pivot Engineers in Austin, Texas. He is the Secretary of Chapter 29, “Wind loads on other structures and building appurtenances - MWFRS” of ASCE 7 for the 2022 code cycle, and the Chair of the task committee on “Aerodynamic Phenomena of Civil Engineering Structures”. He is also an active member of ASCE’s Wind Engineering Division’s Structural Wind Engineering Committee, Forensic Engineering Division’s Committee on Forensic Investigations and TG 2, “Reliability-Based Structural System Performance Indicators” and TG3, “Risk Assessment of Structural Infrastructure Facilities and Risk-Based Decision Making” of the Technical Council on Life-cycle Performance, Safety, Reliability and Risk of Structural Systems. He is also an active member of ACI committees 423-C “Corrosion and Repair of Grouted Multistrand and Bar Tendon Systems”, 377 “Performance-Based Structural Integrity and Resilience of Concrete Structures” and 364 “Rehabilitation of Concrete Structures”.