Civil MDC

Design of bolted splice 2

Design of bolted splice

When designing a bolted splice, which is used to connect two structural members together, there are several key considerations to ensure a safe and efficient connection. Here are the general steps involved in the design process:

Determine design loads: Identify the applied loads on the splice, such as axial forces, shear forces, and moments. These loads can be obtained from structural analysis or design calculations.

Select splice type: Choose the appropriate splice type based on the specific project requirements, structural system, and code provisions. Common splice types include lap splices, butt splices, and sleeve splices.

Determine required bolt capacity: Calculate the required capacity of the bolts to resist the applied loads. This involves considering the tension, shear, and bearing capacities of the bolts. The capacity can be determined based on design codes and standards such as the AISC (American Institute of Steel Construction) Manual or the Eurocode.

Spacing and arrangement of bolts: Determine the spacing and arrangement of bolts along the splice length. Consider factors such as bolt diameter, edge distances, and pitch spacing requirements specified by the design code. Ensure adequate bolt spacing to distribute the applied loads and prevent excessive bearing stresses.

Check bolt shear and bearing capacities: Verify that the selected bolts have sufficient shear and bearing capacities to resist the applied loads. Calculate the shear stress on the bolts and compare it to the allowable shear stress specified in the design code. Similarly, check the bearing stress between the bolt and the connected members against the allowable bearing stress.

Connection stiffness and slip resistance: Evaluate the stiffness and slip resistance of the splice. Consider factors such as the clamping force generated by the bolts, the grip length of the bolts, and any slip-critical requirements. Ensure that the connection can resist relative movement between the connected members under the applied loads.

Check for code compliance: Verify that the designed bolted splice meets the relevant design codes and standards for strength, ductility, and serviceability. Ensure compliance with any additional requirements, such as fire resistance or seismic design provisions, if applicable.

Documentation: Prepare detailed design calculations, drawings, and specifications for the bolted splice to provide clear instructions for fabrication and construction.

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