ABSTRACT
Abstract The best way to strengthen a structure if the design is governed by seismic loads is to increase the q-factor. In the case of lattice structures, this can be done by modifying the bracing system in order to take advantage of the dissipative capacity of tension diagonals. This paper is an attempt to apply the above principle to certain categories of lattice structures (trusses subjected mainly to vertical loads, lattice towers, concentrically braced multistorey frames, and bracings of one-storey mill-building structures). The classic methods of strengthening and repairing, which are also discussed, are applicable mostly to non-dissipative members and connections. Keywords: Steel Structures, Lattice Structures, Seismic Action, Behaviour Factor, Strengthening, Repairing.
