CSA S850-12 pdf download – Design and assessment of buildings subjected to blast loads.
3 Definitions and abbreviations 3.1 Definitions The following definitions shall apply in this standard: Anchorage — the means of attachment of the component to the structure. Attached film configuration — film that is secured to a window frame with either a batten/mechanical anchorage system or with structural silicone. Notes: 1) Film can be attached to the frame on two opposite sides or on all four sides. 2) Film in an attached configuration typically requires an upgrade for the connections between the window frame and the surrounding wall since the batten system and silicone attachment will transfer significantly more load into the frame than the existing frame-to-wall connection was designed for. Authority having jurisdiction (AHJ) — a federal, provincial, or municipal ministry, department, board, agency, or commission that is responsible for regulating by statute the use of products, materials, or services. Blast — a transient change in the gas density, pressure, and velocity of the air surrounding an explosion point. Note: The initial change can be either discontinuous or gradual. A rapid discontinuous change is referred to as a shock wave. A more gradual change is known as a pressure wave. Boiling liquid, expanding vapour explosion (BLEVE) — the explosively rapid vaporization and corresponding release of energy of a liquid, flammable, or other material, which is stored above atmospheric pressure and subjected to a sudden loss of containment and a temperature above its atmospheric boiling point. Note: A BLEVE is often accompanied by a vapour explosion if the suddenly depressurized liquid is flammable. The energy released during flashing vaporization and vapour explosion can contribute to a shock wave. Boundary condition — the manner in which a component is supported along its boundary.
Connection — the means by which two or more components are attached to each other (e.g., beam to column, wall to wall, wall to slab). Note: Steel connections are assemblies that include, but are not limited to, welds, bolts, rivets, angles, and plates. Reinforced concrete connections are often integral, consisting of the concrete and the reinforcement at the end of one component and extending into the other. Ductile connection — a connection that is capable of experiencing significant inelastic deformation before failure. Daylight (unattached) film configuration — a film that is applied to the face of the glazing but not to the window frame. Notes: 1) Daylight film application is only suitable for blast loads marginally larger than those required to fail the glass, the pane (including the glass and film) would be projected into the building as one large sheet rather than many small fragments. 2) Daylight film applications do not significantly increase the loading on the window frame and structure, as the failure mechanism is still based on fracture of the glazing. 3) Daylight film applied to the inner pane of an insulated glass unit will not contain the glass fragments that are generated by the outer pane during a blast event. Deflagration — a combustion reaction of a substance in which the reaction front advances into the unreacted substance at a speed that is less than the speed of sound in the unreacted material. Deformation-controlled action — a load effect, such as moment, shear, or axial force, that results in ductile behaviour for a particular structural component type. Design basis threat (DBT) — the threat that the building owner and/or the AHJ have determined from their threat assessment and/or available intelligence that will be used to determine the blast loads for the design and assessments of the building in question.CSA S850-12 pdf download.
