Composite structural member, method for manufacturing same, and connecting assemblies for composite structural members

A structural member having a longitudinal axis comprising:

• an exterior shell member defining an elongated channel with an inner surface;
• an interior shell member having an outer surface and defining an inner channel, inserted in the elongated channel of the exterior shell member and extending longitudinally therein and defining an inter-shell spacing therebetween;
• and
• concrete filling the inter-shell spacing and including at least one reinforcement bar having a longitudinally extending section extending in the inter-shell spacing and being disconnected from the inner surface of the exterior shell member and from the outer surface of the interior shell member, wherein the inner channel of the interior shell member comprises opposed end sections filled with concrete and wherein each one of the opposed end sections has a length, and the length of each one of the opposed end sections is about 5% to 20% of the length of the inferior shell member.

A process for manufacturing a structural member, comprising:

• machining grooves on at least one of an inner surface of an exterior shell member, an outer surface of an interior shell member, and an inner surface of the interior shell member to promote cohesion between the machined surface and the concrete;
• inserting the interior shell member having an inner channel in an elongated channel of the exterior shell member;
• inserting at least one reinforcement bar in an inter-shell spacing defined between the exterior shell member and the interior shell member;
• and
• Filling the inter-shell spacing with concrete with the at least one reinforcement bar being embedded in the concrete.