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Where is the Base?

ASCE 7-05 defined the base for seismic design as: “The level at which the horizontal seismic ground motions are considered to be imparted to the structure”. Most of the times this is misinterpreted or misunderstood that where the base is considered when

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Posted in Design Code, Engineering Tips, Seismic, structural engineering, structures, Tall Buildings, Technology

SAP2000-Accidental Torsion in Response-Spectrum Case

NOTE: This discussion applies only to SAP2000. ETABS automatically includes the accidental eccentricity specified in the response-spectrum load case. To consider accidental torsion in a response-spectrum case, eccentricity should be added as a separate static load case. The response-spectrum (SPEC)

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Posted in Engineering Tips, SAP2000, Seismic, structural engineering, structures

Design for Seismic Tie Beams

Per ACI 318-08 section 21.12.3.2 – “Grade beams designed to act as horizontal ties between pile caps or footings shall be proportioned such that the smallest cross-sectional dimension shall be equal to or greater than the clear spacing between connected

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Posted in ACI318-08, Design Code, IBC 2009, Seismic, structural engineering, structures

EarthQuake Tips

A very well written tips which explain the behavior and design of Earthquake was provided by IIT India. I have uploaded all the tips documents below:  

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Posted in Engineering Tips, Seismic, structural engineering, structures

Seismic Design of Cast-in-Place Concrete Diaphragms Chords, and Collectors

A very informative technical guidline for Seismic Design of Cast-in-Place Concrete Diaphragms Chords, and Collectors was recently published by NEHRP. it can be downloaded from the following link http://www.nehrp.gov/pdf/nistgcr10-917-4.pdf

Posted in civil engineering, Seismic, structural engineering, structures, Tall Buildings, Technology, Wind

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