scope:

The design recommendations provided in this manual are primarily focused on the wind design of building structures that are especially tall, slender, and/or prone to wind-induced movement. A discussion of both static and dynamic approaches to wind design are presented in subsequent chapters. Wind design performance objectives are achieved by

• Ensuring structural integrity under ultimate loads;

• Limiting lateral deflections under service loads to prevent permanent deformations, damage to nonstructural elements, or adverse effects on the serviceability of the building's services and vertical transportation systems;

• Preventing excessive wind-induced motions, as well as visual and acoustical disturbances that may impact occupant comfort;

• Limiting surface wind intensity to improve pedestrian comfort; and

• Achieving these objectives while working to minimize structural materials and associated embodied carbon and cost.

The manual provides recommendations on achieving the aforementioned performance objectives, including the selection of the wind loading mean recurrence interval (MRI) for serviceability, the establishment of acceptance criteria, guidance on addressing uncertainty in building structural properties such as stiffness and damping, as well as modeling of uncertainties in wind climate, wind loading, and other effects.

A concurrent effort to this Manual of Practice is the ASCE/SEI Prestandard for Performance-Based Wind Design (ASCE 2019). The Prestandard provides a performance-based approach for the design of buildings for wind to help resolve the conflicts in performance objectives that exist in using prescriptive procedures for the wind design and performance- based approach for the seismic design of individual buildings. Among other things, the Prestandard will introduce the use of nonlinear dynamic analysis for wind design and limited nonlinearity in the main wind force resisting system elements. Both these topics are outside the scope of this manual.