Moment Frame Fabrication and Erection In California

Definition of a Moment Frame

A moment frame is a structural system that uses rigid connections between beams and columns to resist bending moments (forces that cause a structural element to bend). This design allows the building to flex without losing its structural integrity.

A steel moment frame refers to a system where steel members (beams and columns) and joints resist horizontal forces, primarily through flexure. According to ASCE 41-13 (2014 Edition), moment frames are capable of withstanding lateral forces such as wind and seismic activity. (Added by Ord. No. 2537CCS § 6, adopted 3/28/17)

Function of a Moment Frame in a Building

The moment frame serves the following key purposes in a building:

1. Resisting Lateral Forces: It helps buildings withstand strong winds and earthquakes by providing lateral stability.
2. Maintaining Structural Stability: It allows controlled deformation, preventing catastrophic damage during extreme conditions.

Types of Buildings Where Moment Frames Are Installed

Moment frames are used in both new constructions and retrofits, alterations, or remodels of existing buildings. They are typically installed in the following scenarios:

1. Buildings in Seismic Zones: To provide additional resistance against earthquakes.
2. Tall Structures: Where wind resistance is critical for stability.
3. Industrial and Commercial Buildings: Where high load-bearing capacity and lateral force resistance are essential.

Process of Fabricating and Erecting or Installing a Moment Frame

The construction of a moment frame involves several key steps:

1. Structural Design: Structural engineers calculate forces and design the necessary rigid connections to ensure the frame's integrity.
2. Retrofit Requirements: In the case of retrofits, a licensed engineer must evaluate and analyze the structure to determine the necessary modifications, repairs, or replacements of structural elements and their connections to achieve the required strength and stiffness.
3. Fabrication: Beams and columns are fabricated using structural steel components like wide flanges and hollow structural sections (HSS), which are installed on concrete foundations or substructures.
4. Installation: The pre-fabricated components are assembled on-site, ensuring that the connections are strong enough to resist the forces anticipated in the design.

Moment Frame Service in California

KMBJ Structural Steel. Inc., Fabricates moment frames in its Los Angeles workshop and erects or installs them throughout the state of California.