In a plane truss, both the truss structure and the applied loads lie in the same plane.

In a space truss, either the structure or the loads or both lie in different planes.

In plane truss, both the truss structure and the applied loads lie in the same plane.

In space truss, either the structure or the loads or both lie in different planes.

There is no relation between space truss and shell structure, a shell structure cannot behave like space truss, the distribution of force in a shell structure behave like a beam or a plate, and space truss behave more like a roof frame

1. The structure is different:

①The steel truss structure is similar to plane steel truss, belongs to single way force structure；

②The space frame is the overall spatial truss structure；

③Compare to the space frame, the truss structure save the picket of the bottom chord and ball nodes.；

2. Three different:①Different nature；②Different basic units；③ Different design requirements；

3. Development history:The truss structure is evolved from space frame, with unique advantage and practicability, more economically.

The above answers are taken from Xuzhou SAFS Steel Structure Engineering Co., Ltd. NWS.（safsteelstructure）.com

not truss