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Second-Order Effects on Wind-Induced Structural Behavior of High-Rise Steel Buildings



Sejun Park, Donghun Yeo


This paper investigates P-Δ effects on wind-induced structural dynamic behavior of a 60-story high-rise steel structure known as the CAARC building model. These effects are considered in the structural analysis by using a geometric stiffness method allowing the dynamic analysis to be performed without iterations. Datasets of the aerodynamic pressure on the CAARC building model for suburban exposure are used in the database-assisted design (DAD) procedure to calculate, in addition to overturning moments and shear forces at the base, members’ demand-to-capacity indexes (DCIs), inter-story drift ratios, and accelerations. Dynamic analyses are performed using five reference mean hourly wind speeds at the rooftop for suburban terrain exposure (Uref = 20 m/s, 40 m/s, 60 m/s, 80 m/s, and 100 m/s). The first three and the last three wind speeds are used in analyses for serviceability and strength, respectively. For Uref = 80 m/s, the P-Δ effects increased the non-directional peak effective shears and overturning moments by up to 9 % and 15 %, respectively; the DCIs for the interaction of axial forces and bending moments, BijPM, and for the shear forces, BijV, calculated for a typical set of 18 structural members, by up to 9 % for columns and 22 % for beams and the DCIs BijV by up to 33 % for columns and 14 % for beams. For Uref = 60 m/s, the P- Δ effects increased the inter-story drift ratios by up 40 % and the resultant accelerations at the top floor by up to 20 %.
Journal of Structural Engineering-ASCE


CAARC building, Database-Assisted Design (DAD), Demand-to-capacity index (DCI), Geometric stiffness approach, High-rise steel structures, P-Δ effects, Wind effects


Park, S. and Yeo, D. (2017), Second-Order Effects on Wind-Induced Structural Behavior of High-Rise Steel Buildings, Journal of Structural Engineering-ASCE, [online], ST.1943-541X.0001943 (Accessed July 16, 2024)


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Created December 8, 2017, Updated November 10, 2018