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Seismic bracing is an earthquake-resistant support system primarily designed to withstand seismic forces, mainly used to support electromechanical pipeline equipment such as water pipes, air ducts, and cable trays, while providing seismic reinforcement.
According to GB50981-2014 Code for Seismic Design of Mechanical and Electrical Engineering in Buildings: Seismic bracing refers to earthquake-resistant support facilities securely connected to the building structure, composed of anchors, reinforced hangers, seismic connecting components, and diagonal braces. Its primary function is to effectively transfer seismic forces generated by equipment to the building structure, thereby achieving the purpose of seismic reinforcement.
Seismic bracing systems must align with the following globally recognized standards:
Chinese National Standards (GB Series)
GB 50981-2014 Code for Seismic Design of Mechanical and Electrical Engineering:
Mandatory for regions with seismic intensity ≥6°. Specifies load calculations, spacing limits (e.g., lateral supports ≤12m, longitudinal ≤24m), and thresholds for pipes/cable trays (e.g., water pipes ≥DN65, ducts ≥0.38m²).
GB/T 37267-2018 General Technical Specification for Seismic Supports and Hangers:
Defines material properties (Q235B steel yield strength ≥235MPa), component thickness (connectors ≥5mm), corrosion resistance (hot-dip galvanizing ≥65μm), and load testing (1.5× rated load without deformation).
CJ/T 476-2015 Technical Requirements for Seismic Supports in Building Mechanical/Electrical Systems:
Details connector strength, salt spray testing (≥800 hours), and supplemental criteria.
Global Standards
ANSI/ASCE (USA): Material strength and seismic verification methods partially align with GB standards (e.g., ASTM A36 ≈ Q235B steel).
Eurocode 8 (EU): Load testing (12.7mm/min loading rate) matches GB/T 37267-2018.
IBC (International Building Code): Requires dynamic cyclic load testing to simulate seismic deformation.
Industry-Specific Codes
GB/T 17116 Technical Specifications for Piping Supports: Addresses mechanical performance of seismic components.
CECS 420:2020 Installation and Acceptance Code for Seismic Supports: Core standard for construction quality control.
Seismic braces serve as the "invisible skeleton" for mechanical/electrical safety, providing seismic force transfer and system stability. Prioritize:
Material Integrity (Q235B/stainless steel)
Corrosion Resistance (≥65μm hot-dip galvanizing)
Structural Compliance (door-type bracket configurations).
Mandatorily adhere to GB 50981-2014 and GB/T 37267-2018, supplementing with ANSI/ASCE or Eurocode 8 for global projects.
Modular Component System:
Combines prefabricated sections (C-shaped channel steel ≥41×41mm), seismic connectors, pipe clamps, and anchor bolts. Adjustable sizing enables adaptation to complex layouts.
Example: Door-type brackets require ≥1 lateral or 2 longitudinal braces to ensure multi-directional stability.
Enhanced Mechanical Performance:
Shear Resistance: Diagonal braces and channel steel connections increase joint shear strength by ≥30%.
Deformation Control: Maximum deflection ≤ span/200 under rated load; no permanent deformation at 1.5× load.
| Parameter | Requirement | Global Equivalent |
|---|---|---|
| Base Material | Q235B carbon steel (≥250MPa yield) / SS304/316 | ASTM A36 / AISI 304/316 |
| Clamp Thickness | ≥6mm (exceeds standard 5mm) | Complies with ISO 630 |
| Surface Treatment | Hot-dip galvanizing (≥65μm) / electroplating (≥8μm), salt spray ≥800h | Exceeds DIN EN ISO 1461 |
Safety Redundancy: Transfers seismic forces to building structures (e.g., DN150 pipe systems resist Intensity 8 earthquakes).
Installation Efficiency: Modular assembly speeds up construction 6–8× vs. welding.
Durability & Eco-Design: Hot-dip galvanizing extends service life ≥30 years; no welding/flames reduces pollution.
Seismic bracing is an earthquake-resistant support system primarily designed to withstand seismic forces, mainly used to support electromechanical pipeline equipment such as water pipes, air ducts, and cable trays, while providing seismic reinforcement.
According to GB50981-2014 Code for Seismic Design of Mechanical and Electrical Engineering in Buildings: Seismic bracing refers to earthquake-resistant support facilities securely connected to the building structure, composed of anchors, reinforced hangers, seismic connecting components, and diagonal braces. Its primary function is to effectively transfer seismic forces generated by equipment to the building structure, thereby achieving the purpose of seismic reinforcement.
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