Structural & Sliding Bearings: Elastomeric Bearings for Bearing Structural Elements

Understanding Structural & Sliding Bearings in concrete construction

Elastomeric bearings have become an essential component in both residential and industrial construction, particularly in supporting reinforced concrete structures under bending stress. These bearings, available as reinforced or unreinforced types, provide critical support in precast or in-situ concrete structures. Their application ranges from acting as sliding bearings to facilitating thermal separation.

The Role of Elastomeric Bearings in Load Transfer

In concrete and reinforced concrete construction, elastomeric bearings play a pivotal role in transferring loads. The weight of roofs, beams, and ceilings (both dead and live loads) is channelled through these bearings to underlying structures like columns, walls, and brackets. This transfer involves not just pressure forces but also accommodating slab angular deflections and horizontal movements. Such movements can result from various factors, including concrete shrinkage and temperature-induced expansion.

Selection and Application of Bearings

The selection between sliding or shear deformation bearings hinges on specific application needs. The bearing design can be either point-shaped or strip-shaped. A critical aspect of using these bearings is their placement within the stirrup reinforcement of adjacent structural elements. This strategic placement is vital to prevent spalling at the concrete’s outer edges.

Design Considerations and Installation

The choice between compact or steel-reinforced structural bearings depends largely on the pressure force exerted. In some instances, profiling of these bearings might be necessary. This could be to accommodate uneven surfaces or to avert severe bulging under high stress loads. When installing sliding bearings, especially in in-situ concrete scenarios, meticulous care is imperative to ensure the bearings function effectively.

Construction bearings have the capacity to withstand full stress loads immediately post-installation. They remain functional throughout the lifespan of the building, this longevity is a testament to the durability of elastomeric bearings.

Case Study

SDG supplied Creagh Concrete with movement solutions for this impressive 294-bedroom hotel in London.

Gilbert-Ash constructed hotel in 2022, the project encompassed turning an existing office and residential block into a smart modern hotel, occupying 13 floors with a total of 294 bedrooms.

With the increased use of off-site methods, this structure featured an In-Situ concrete frame, with a precast external structural façade. The precast façade elements would be fixed to the concrete frame, providing an above-standard architectural finish with integrated brick.  

As with most precast elements, connections to in-situ concrete can present a challenge due to uneven surfaces. Factory-made precast concrete can achieve a precise surface flatness due to a high-quality mould, but in-situ concrete cannot offer the same hence the interface between the two materials can be a challenge.

The key to sound connections between precast and existing in-situ concrete is to utilise a deformation bearing to absorb surface unevenness and distribute the load evenly between both elements.

With the assistance of Calenberg Germany, SDG proposed the use of Bi-Trapeze elastomeric bearings for use with the precast elements.

Over 10,000 meters of Calenberg Bi-Trapeze elastomeric bearings were supplied over the entire project duration. 

The elastic effect of the Bi-Trapeze bearing works to transfer force centrally in structural connections while also compensating for deviations in the contact surfaces. Through elastic deformation, Bi-Trapeze bearings easily accommodate surface defects such as unevenness.

By understanding the nuances of elastomeric bearings in concrete construction, it becomes evident how crucial they are in maintaining the structural integrity of modern buildings. The choice and application of these bearings, be it in sliding or shear form, are vital for the safety and longevity of concrete structures. With their ability to adapt to various stresses and movements, elastomeric bearings stand as a testament to modern engineering’s ability to create durable, flexible, and efficient construction solutions.

SDG’s Technical Expertise in Structural & Sliding Bearings Solutions

At SDG, we pride ourselves on our exceptional technical support and expertise, especially when it comes to the supply and advice on bearings for various project applications. Our team of technical experts is equipped with in-depth knowledge and experience, ensuring that your structure benefits from the most suitable and effective bearing solutions.

Tailored Advice for Every Project

Understanding that each project comes with its unique set of challenges and requirements, SDG’s specialists provide bespoke advice to meet these specific needs. Whether your project involves structural & sliding bearings or specialised bridge bearings, our team is on hand to guide you through the selection process.

A Commitment to Excellence

SDG’s commitment to excellence is reflected in our comprehensive approach. From initial consultation to final implementation, our experts work closely with clients to ensure that every aspect of the bearing requirement is meticulously addressed. This approach guarantees that the solutions we provide are not only technically sound but also aligned with your project’s specific demands.

Do you have any questions about bearings? You’re welcome to send us an enquiry and we’ll advise you on which sliding & structural bearings or bridge bearings is the right for your project.