When retrofitting buildings for improved seismic safety we strive to minimize construction cost and time, maximize benefits through performance-based design, and preserve historic appearance and fabric as appropriate. Context-sensitive solutions require both experience and innovation, using existing systems with new structural materials. Our experience includes buildings spanning 150 years, from adobe and unreinforced masonry to reinforced concrete and structural steel. Our innovation has led to such solutions as mass reduction to lower demand on existing structure, concealed strengthening behind historic finishes, visible supplementary diaphragms and internal frames, external concrete buttresses, and new steel framed building expansions bracing old construction.
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