<P> Buildings, aircraft, skeletons, anthills, beaver dams and salt domes are all examples of load - bearing structures . The results of construction are divided into buildings and non-building structures, and make up the infrastructure of a human society . Built structures are broadly divided by their varying design approaches and standards, into categories including building structures, architectural structures, civil engineering structures and mechanical structures . </P> <P> The effects of loads on physical structures are determined through structural analysis, which is one of the tasks of structural engineering . The structural elements can be classified as one - dimensional (ropes, struts, beams, arches), two - dimensional (membranes, plates, slab, shells, vaults), or three - dimensional (solid masses). The latter was the main option available to early structures such as Chichen Itza . A one - dimensional element has one dimension much larger than the other two, so the other dimensions can be neglected in calculations; however, the ratio of the smaller dimensions and the composition can determine the flexural and compressive stiffness of the element . Two - dimensional elements with a thin third dimension have little of either but can resist biaxial traction . </P> <P> The structure elements are combined in structural systems . The majority of everyday load - bearing structures are section - active structures like frames, which are primarily composed of one - dimensional (bending) structures . Other types are Vector - active structures such as trusses, surface - active structures such as shells and folded plates, form - active structures such as cable or membrane structures, and hybrid structures . </P> <P> Load - bearing biological structures such as bones, teeth, shells, and tendons derive their strength from a multilevel hierarchy of structures employing biominerals and proteins, at the bottom of which are collagen fibrils . </P>

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