Seismic Brackets
Seismic bracing is a method that enhances the structural integrity of buildings, especially in areas prone to earthquakes and high winds. It involves installing additional supports to prevent or minimize the movement of the building during seismic events.
What is Seismic Bracket?
Seismic bracing is a method that enhances the structural integrity of buildings, especially in areas prone to earthquakes and high winds. It involves installing additional supports to prevent or minimize the movement of the building during seismic events.
These supports absorb and redistribute the forces of an earthquake, reducing the risk of structural damage. In warehouses, several types of seismic bracing systems are common:
Cross bracing
Involves placing braces in an X-shape in the building's framework, providing stability in two directions.
Shear walls
Sturdy walls in relevant locations to resist the lateral forces from winds and seismic activities.
Moment-resisting frames
These withstand vertical loads and lateral forces without bonding.
Base isolation systems
These involve constructing the building on shock absorbers, allowing the structure to move independently of its foundation.
Types of Seismic Brackets: Seismic Cable and Rigid Sway Brace
There are two main types depending on the specific needs of the system. Seismic cable braces offer flexibility and are ideal for quick and fast installation, thus minimising the labour costs. It is also the only option if there is vibration isolation involved. They have to be used in pairs though, since they only work in tension. Yet, this is an advantage during design, whereas rigid braces require both tension and compression load calculations.
Rigid sway braces provide strong resistance against lateral and longitudinal movements. But they don't allow for vibration isolation. They are also more difficult to design and install.
Both types can be used together in a system to provide comprehensive protection.
Components of Seismic Brackets : Hangers, Fittings, Restraints and Rod Stiffeners
A bracing system is made up of several key components, each playing a vital role in securing the piping during an earthquake. Hangers and fittings are used to suspend and stabilize the pipes, while restraints add extra support to withstand seismic forces. If there is a need for protection against uplift forces, then rod stiffeners are required as well.
Pipe hangers must be attached securely to the structural members to prevent movement, and the braces must be installed perpendicular to the run of the pipe to effectively resist horizontal forces. Proper installation of these components is essential for the system to function as intended during earthquakes.
The Principles of Seismic Brackets
Seismic bracing resists horizontal motion. Braces are installed to resist both lateral (perpendicular to the pipe) and longitudinal (parallel to the pipe) swaying. Vertical motion is not usually a concern. Seismic braces, like pipe hangers, must be attached to the building structure so that fire sprinkler pipe and other non-structural components can move as a unit with the building. The structural members to which seismic braces are mounted must be able to withstand the anticipated seismic forces. The seismic load is the inertia force on the structure. Inertial Forces when the shaking of buildings causes pipe to shake relative to the building, stressing pipe hangers and the pipes themselves. All feed and cross mains, and branch lines 2.5" or greater in diameter must be braced against lateral (perpendicular to the pipe) and longitudinal (parallel to the pipe) motion.
Seismic bracing is essential for earthquake protection because it helps to prevent damage to buildings and infrastructure during an earthquake. When a building is not adequately braced, the lateral forces that occur during an earthquake can cause significant damage, including:
Structural damage: The lateral forces can cause walls to crack, floors to collapse, and roofs to cave in, leading to severe structural damage.
Non-structural damage: Lateral forces can also cause damage to non-structural components such as windows, doors, and mechanical systems.
Occupant safety: Buildings that are not adequately braced are at risk of collapse during an earthquake, which can cause injury or death to occupants.
By implementing a seismic bracing system, building owners can protect their investment and ensure the safety of their occupants. Seismic bracing is also essential for compliance with building codes and regulations, which require seismic bracing in areas prone to earthquakes.
Warehouses require seismic bracing to maintain structural integrity and ensure safety. These immense structures often hold heavy inventory and equipment, making them particularly vulnerable during seismic events.
Seismic bracing and seismic racks provide the necessary support, enabling these buildings to withstand the stresses of earthquakes. This concept mirrors biomimicry, where design inspiration can come from nature's resilience, allowing structures to adapt and endure environmental stresses, including harsh weather and natural disasters.
Ignoring seismic safety measures in warehouses can lead to severe consequences. Without adequate bracing, these buildings are at heightened risk of structural failure or collapse during seismic activities.
It poses a significant threat to the safety of personnel and leads to potential economic losses due to damage to the warehouse and its contents. The absence of such safety measures can also result in non-compliance with building codes and regulations, further complicating matters for warehouse owners.
The benefits of implementing seismic bracing and seismic racks in warehouses extend well beyond earthquake protection. They enhance the overall durability of the structure, making it more resilient in adverse weather conditions.
Additionally, buildings with seismic upgrades often enjoy increased resale value and compliance with safety regulations. Knowing their workplace is safe from unforeseen natural disasters translates to greater peace of mind for warehouse owners and employees.
Designing Effective Seismic Brackets
Designing effective bracing systems for rooftops that are compliant with seismic bracing requirements involves careful review of several aspects including structural analysis, material selection, and code compliance to name a few.
Structural Analysis – This step consists of gathering both seismic load calculations and dynamic analysis information. Seismic load calculations measure factors such as location, soil type, building height, and mass distribution. Dynamic analysis determines how the structure will respond dynamically to seismic forces or extreme stress from inclement weather and high winds. The information provided by these two methods helps guide the design of the bracing system.
Material Selection – When deciding upon material selection, it is important to acknowledge seismic bracing should have high ductility, allowing parts to absorb and dissipate energy without fracturing. Another essential aspect to consider is strength of material. Materials must be strong enough to resist seismic forces or high winds without yielding or breaking. The choice of materials should also consider the building's overall weight and the impact on its seismic performance. Steel is an example of a popular choice due to its excellent ductility and strength ratings. Our direct mount bases are made entirely from steel, ensuring maximum performance.
Redundancy and Resilience – Incorporating redundancy into your seismic bracing system ensures that if one part of the bracing system fails, other parts can still carry the load. This increases the overall resilience of the structure. The bracing system should also be designed to prevent progressive collapse, where the failure of one element leads to the failure of others, causing a chain reaction.
Code Compliance & Testing – The seismic brace system's design must comply with local and international building codes and standards. Before implementation, the design should be validated using computer simulations and modeling to predict its performance during an earthquake. Where feasible, physical testing of components or scale models may be conducted to verify the effectiveness of the bracing system under simulated seismic conditions.
Site-Specific Considerations – When examining location, rooftop surface material and seismic hazard probability must be considered. Common rooftop surface materials include rubber membrane, steel, and concrete, each requiring a different method for affixing seismic bracing. When determining the seismic hazard assessment, the design must account for the specific seismic risks of the location, including the likelihood and potential magnitude of earthquakes.
Seismic Bracket Installation
1. Snap a chalk line for the back of the case or lineup. Cases with seismic brackets must be set at least 5" away from a wall.
2. Align the rear seismic brackets on the chalk line.
3. Mark, drill, and install the rear seismic brackets to the floor. Follow local seismic building codes. Purchase the anchor rods, washers, nuts, and adhesive. Install all rear seismic brackets at the same time for a lineup.
4. Move the first display case into position. Snap a chalk line along the front bases.
5. Align the front seismic brackets against the bases and on the chalk line. Mark the locations for drilling.
6. Move the display case and seismic brackets away. Drill the holes into the floor for the front seismic brackets.
7. Move the display case back into position. Properly level and shim display cass according to the Installation & Operation Manual.
8. Attach the rear seismic brackets to the display case using the supplied screws and torque 60 in-lbs. Note: A right angle drill/driver will be helpful for the narrow clearance if the case is set along a wall.
9. Install the front seismic brackets to the floor. Follow local seismic codes.
10. Attach the front seismic brackets to the display case using the supplied screws and torque 60 in-lbs .
11. Continue with each case if installing a lineup. The rear seismic bracket at a joint will be inaccessible on the second case and will only be installed to the first case . The front seismic bracket at a joint can be installed to both cases.
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