The purpose of this state-of-art document is to provide present practices to be used of precast and prestressed concrete in nations in seismic areas, to suggest strong perform, and to debate present advancements. The file has been drafted via 30 members from 9 various countries.
This state-of-art file covers: nation of the perform in numerous nations; benefits and downsides of incorporating precast bolstered and prestressed concrete in development; classes realized from prior earthquakes; building options; layout ways; fundamental lateral load resisting platforms (precast and prestressed concrete body platforms and structural partitions together with twin structures) diaphragms of precast and prestressed concrete flooring devices; modelling and analytical tools; gravity load resisting structures; foundations; and miscellaneous components (shells, folded plates, stairs and architectural cladding panels). layout equations are stated the place worthy, however the emphasis is on ideas. usual cast-in-place bolstered concrete isn't thought of during this report.
This fib cutting-edge file is meant to aid designers and constructors to supply secure and low-priced functions of structural precast concrete and whilst to permit innovation in layout and development to proceed.
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Additional resources for FIB 27: Seismic design of precast concrete building structures
A performance level is the same as a limit state, although the term performance level is typically applied to the performance of an entire structure rather than to a member or cross-section. Examples of performance levels include immediate occupancy, damage control, and collapse prevention. Performance levels can correspond to the performance of structural members such as beams, columns, or walls, or to that of non-structural elements or systems such as cladding or utilities. Performance Objective A performance objective or goal consists of a performance level associated with an earthquake hazard level.
2-9: Collapse of precast concrete hollow core floor (1994 Northridge earthquake) Fig. 2-10: Flexible connections connecting diaphragm to precast concrete beam (1999 Kocaeli earthquake) 26 2 Lessons from previous earthquakes Fig. 5 Poor joint and connection details Beam-column joints of moment resisting frames incorporating precast concrete elements have often failed in earthquakes due to poor details. A significant cause of failure has been the brittle failure of reinforcing bars in the vicinity of welds.
Site welding can cause minor concrete spalling around weld plates unless the plates are edged with compressible tape to allow for thermal expansion. In some countries, some grades of reinforcing steel are not weldable, while other bar grades require specialised welding procedures. Reinforcing bar welding procedures should be confirmed by the bar manufacturer, or by testing. Welded connections will often require fire or corrosion protection. 4 Bolted connections The key considerations in bolted connections are the length, strength grade and tension, of the bolts.
FIB 27: Seismic design of precast concrete building structures