Structural Engineering Research Institute

SERI invites you to a webinar on "IS 1893:2025: Seismic Design of Structures – Transition & Implementation". Participation certificates will be provided upon completion of the webinar.

Rapidcore, Precast Offsite Cores Rapidcore lift and stair cores are manufactured offsite in bespoke moulds and are installed quickly and efficiently by our specialist installation teams. Wa...

Steel-to-steel connections can be created using various methods, including:

1. Welding: Fusion welding (e.g., shielded metal arc welding, gas metal arc welding) or resistance welding.
2. Bolting: Using high-strength bolts, such as A325 or A490, with proper torque control.
3. Riveting: Though less common, rivets can still be used for certain applications.

The choice of connection method depends on factors like load requirements, structural design, and fabrication constraints.

*Precast Concrete Connections with Bolts*

Precast concrete connections with bolts are a common method for joining precast concrete elements, such as beams, columns, and slabs. These connections provide a strong and durable link between the elements, ensuring structural integrity and stability.

*Types of Bolted Connections*

- *Dry connections:* Bolts are used to connect precast elements without any additional materials like grout or concrete.
- *Grouted connections:* Bolts are used in conjunction with grout or concrete to fill gaps and provide additional strength.

*Typical Details*

- *Bolt types:* High-strength bolts, such as ASTM A325 or A490, are commonly used for precast concrete connections.
- *Anchor types:* Anchor bolts, such as headed studs or threaded rods, are used to connect precast elements to foundations or other structures.
- *Plate connections:* Steel plates are used to connect precast elements, with bolts passing through the plates to secure the connection.
- *Connection design:* The design of the connection depends on the specific application, including the type of load, the size and type of precast elements, and the desired level of ductility.

*Benefits*

- *Fast installation:* Bolted connections allow for quick and efficient installation of precast concrete elements.
- *Flexibility:* Bolted connections can accommodate some degree of movement and flexibility, making them suitable for structures subject to seismic or wind loads.
- *Durability:* Bolted connections can provide a durable and long-lasting connection between precast concrete elements.

*Considerations*

- *Design and detailing:* The design and detailing of bolted connections require careful consideration to ensure that they meet the structural requirements and performance expectations.
- *Installation:* Proper installation of bolted connections is critical to ensure that they function as intended and provide the required strength and durability.

Precast sample details pictures for having feel of the construction.

Look into the details of RCC Column face and steel truss bolted connection. It enhances the constructability.

Mechanical Bar bending machine!

Construction of Bridges is always a challenge. Segmental construction is an important method to construct it with minimal disturbance to traffic.

ASBI Presentation - Segmental Bridge Construction Animation