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Fifty Years Ago • Just a half-century ago very little was known about the genetic factors that contribute to human disease. • In 1953, James Watson and Francis Crick described the double helix structure of deoxyribonucleic acid (DNA), the chemical compound that contains the genetic instructions for building, running and maintaining living organisms. • Methods to determine the order, or sequence, of the chemical letters in DNA were Continue to download »
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Built to Resist Earthquakes The Path to Quality Seismic Design and Construction Briefing Paper 1 Briefing Paper 1 Building Safety and Earthquakes Part C Earthquake Resisting Systems Introduction This Briefing Paper 1 Building Safety and Earthquakes consists of four parts describing earthquakes and their effects on buildings Parts A and B describe the causes of earthquakes and resulting ground motions and explain how earthquake motions create various forces acting on a building This Part C describes the types of structural systems and lateral force resisting elements used in buildings and how they can be used in combinations Part D discusses the load path of earthquake forces within buildings Structural Systems Defined The Uniform Building Code UBC earthquake provisions define three basic types of building structural systems bearing wall systems building frame systems and momentresisting frame systems Bearing wall systems consist of vertical loadcarrying walls located along exterior wall lines and at interior locations as necessary 