What Are Seismic Brackets? A Comprehensive Guide to Their Definition, Function, and Core Principles

In building mechanical and electrical engineering, seismic support brackets serve as the “invisible guardians” ensuring structural safety, particularly indispensable in earthquake-prone regions. Many mistakenly confuse these brackets with ordinary load-bearing supports, yet their functions differ significantly. Today, we’ll thoroughly dissect seismic support brackets to understand their core value and operational logic.

Seismic supports, formally known as seismic hangers for building mechanical and electrical engineering, are a critical component of hanger systems. They primarily secure mechanical and electrical facilities within buildings, including water supply and drainage, fire protection, heating, ventilation, air conditioning, gas, thermal systems, power, and communications. Their core function is to constrain and limit unreasonable displacement of mechanical and electrical components during earthquakes, control component vibration, resist seismic forces damaging the mechanical and electrical systems, ensure they remain operational after an earthquake, and provide safeguards for personnel evacuation and rescue efforts.

Unlike traditional gravity-bearing supports, which only bear vertical loads to prevent sagging and deformation, standard supports cannot resist seismic horizontal and vertical forces. Seismic supports, however, employ unique diagonal bracing designs that not only assist in bearing partial vertical loads but also effectively resist both transverse waves (shear waves) and longitudinal waves (push waves) within seismic waves. Transverse waves cause violent ground shaking in all directions, posing extreme destructive potential. The diagonal bracing of seismic supports firmly “holds” electromechanical pipelines, preventing detachment, fracture, or collision, thereby minimizing the extent of seismic damage to electromechanical systems.

Structurally, per GB50981-2014 “Code for Seismic Design of Building Mechanical and Electrical Engineering,” seismic supports comprise anchors, reinforced suspension rods, seismic connection components, and seismic braces. All components must be prefabricated, with connection fasteners designed for easy installation. Common types include lateral seismic hangers, single-pipe (rod) seismic supports, and portal seismic supports, each suited for different mechanical and electrical pipeline scenarios.

The development of seismic supports also has a distinct historical context. In 1947, the United States first mandated seismic support design methods in the fire protection field. Subsequently, countries including Europe and Japan gradually adopted and applied them across various mechanical and electrical engineering projects. Following the 2008 Wenchuan earthquake, China revised its building seismic design codes. The “Code for Seismic Design of Building Mechanical and Electrical Engineering” was formally promulgated in 2014 and became mandatory on August 1, 2015. This marked the standardization of seismic protection for building mechanical and electrical systems in China, making seismic supports mandatory for buildings in areas with seismic intensity of 6 or higher.