Here is a UB rafter at the knee joint, it also contains a cut UB haunch which are usually required for spans over 20 metres. This unified beam is supported by fly bracing to the 'C' purlins and it is also embedded in the brick pillar.
A standard four bolt cleat is used to connect the rafter and the purlins, in this instance it is replacing a knee joint and the haunch that is usually involved. In fact the majority of connections between the purlins and rafters were done using this technique.
This rigid connection using a cleat plate has allowed for extra bracing in two directions, with one member spanning between the central rafter and the exterior walls purlin and the other cross bracing to a 'c' purlin.
Here is a UB rafter at the knee joint, it also contains a cut UB haunch which are usually required for spans over 20 metres. This unified beam is supported by fly bracing to the 'C' purlins and it is also embedded in the brick pillar.
A standard four bolt cleat is used to connect the rafter and the purlins, in this instance it is replacing a knee joint and the haunch that is usually involved. In fact the majority of connections between the purlins and rafters were done using this technique.
This rigid connection using a cleat plate has allowed for extra bracing in two directions, with one member spanning between the central rafter and the exterior walls purlin and the other cross bracing to a 'c' purlin.
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