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Bolt design calculation
Bolt design calculation for shear and tension is required when the bolt is subjected to combined shear and tensile stresses.
The loading tab in calculator is to input the design shear load and design tension load both in kilo Newton.
Bolt details includes the nominal diameter of bolt this is generally represented with a prefix ‘M’ for eg. M16, M20 etc.
The grade denotes the ultimate stress and the yield stress of the bolt. The grade has to be chosen from the dropdown.
Ultimate stress of bolt and yield stress of bolt is automatically calculated however provision is given for the user to input their own values also.
The connection details includes the type of connection and number of shear planes formed within the connection.
The number of shear plane passing through threaded portion of the bolt is represented by ‘nn’.
The number of shear planes passing through the shank or unthreaded portion of the bolt is represented by ‘ns’.
These two quantities are calculated by programme, however user can input their own values as well.
The pitch and edge distance are also calculated by the programme as per IS 800 – 2007 and can be edited by the user.
Connecting plate details:
Connecting plates can be seen from the diagrams for single shear and double shear.
The plate thickness of plate 1 and 2 are necessary for single shear.
The plate thickness of plate 1,2 and 3 are necessary for double shear.
Packing plate thickness is optional. Depending on which the reduction factor will be calculated.
Grip length reduction factor and packing plate reduction factor are considered in the design.
The long joint reduction factor is not considered as the length between the extreme connections is not known and it depends upon the user.