Provided is a stringer having a first stiffener extending along a path and having a first flange portion and a first web portion, wherein the first stiffener is formed from a composite including a fabric reinforcement; a second stiffener extending along the path and having a second flange portion and a second web portion, the first web portion being opposed and spaced from the second web portion, wherein the second stiffener is formed from a composite including a fabric reinforcement; and an intermediate stiffener extending along the path, the intermediate stiffener being positioned between the first web portion and the second web portion, the intermediate stiffener having a first side and a second side, the first side being connected to the first web portion and the second side being connected to the second web portion, wherein the intermediate stiffener is formed from a composite including unidirectional reinforcement fibers.

Systems and methods described herein include collapsible and deployable truss structures defining reduced volumes for compact storage.

Systems and methods described herein include collapsible and deployable truss structures defining reduced volumes for compact storage.

A structural member comprising a first round flange, a second round flange substantially parallel to the first round flange, an elongate web disposed between the first and second round flange, the web having an upper edge, and a lower edge, wherein the first round flange, the second round flange and the elongate web are secured together to form a structurally integral unit. The structural member may further comprise a third round flange and a fourth round flange substantially parallel to the third round flange, wherein the round flanges and the elongate web are secured together to form a structurally integral unit in which the first face of the web is in contact with the first round flange and the third round flange, and the second face of the web is in contact with the second round flange and the fourth round flange.

A structural member comprising a first round flange, a second round flange substantially parallel to the first round flange, an elongate web disposed between the first and second round flange, the web having an upper edge, and a lower edge, wherein the first round flange, the second round flange and the elongate web are secured together to form a structurally integral unit. The structural member may further comprise a third round flange and a fourth round flange substantially parallel to the third round flange, wherein the round flanges and the elongate web are secured together to form a structurally integral unit in which the first face of the web is in contact with the first round flange and the third round flange, and the second face of the web is in contact with the second round flange and the fourth round flange.

A deformable device includes a deformable beam or hinge having an extended state, a flattened state, and a rolled state if a beam, where a stiffness and strength of the deformable beam or the hinge in the extended state is greater than a different stiffness and strength of the deformable beam or the hinge in the flattened state. A cross section includes a first about V shape half and a second about V shape half. Each half includes a vertex with at least one curve extending into two walls at least one of the walls including a plurality of truss members, both of the walls extend into a joining edge. The first about V shape half and the second about V shape half are joined together at a seam of a joining edge of the first about V shape half and the second about V shape half.

A clearspan structure including component systems, and methods of forming a clearspan structure including component systems, for mitigating hazards to personnel or equipment from explosions, fires, toxic material release, and other hazards in hazardous locations. The exemplary clearspan structure is also capable of withstanding environmental conditions such as snow loads and wind. The exemplary clearspan structure is, for example, a tent or fabric structure which includes a plurality of frame members forming a support system for the clearspan structure, and fabric roof portions and walls for enclosing the clearspan structure.

A clearspan structure including component systems, and methods of forming a clearspan structure including component systems, for mitigating hazards to personnel or equipment from explosions, fires, toxic material release, and other hazards in hazardous locations. The exemplary clearspan structure is also capable of withstanding environmental conditions such as snow loads and wind. The exemplary clearspan structure is, for example, a tent or fabric structure which includes a plurality of frame members forming a support system for the clearspan structure, and fabric roof portions and walls for enclosing the clearspan structure.

A support structure comprising a pultruded outer beam (12), a pultruded inner beam (14), a plurality of wear tabs (16) affixed to the inner beam, and a gear track (18) affixed to the inner beam. The outer beam is substantially hollow and adapted to receive the inner beam and the inner beam is shaped so that a portion of the inner beam extends nearly the entire height of the outer beam and a portion of the inner beam extends nearly the entire width of the outer beam, the plurality of wear tabs are located at one or more corners of the inner beam, and the gear track contacts a gear for facilitating movement of the inner beam.

A deformable device includes a deformable beam or hinge having an extended state, a flattened state, and a rolled state if a beam, where a stiffness and strength in the extended state is greater than a different stiffness and strength in the flattened state, the deformable beam or the hinge deformable along a long axis. An end face cross section transverse to the long axis includes a first periodic curved member which defines at least two shaped curves. A second periodic curved member defines at least two shaped curves. The second periodic curved member is mechanically coupled to the first periodic curved member at respective ends of the end face cross section. The first arc length of the first periodic curved member and the second arc length of the second periodic curved member are of about a same arc length.