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Lessons learned from the ˇ°5.12ˇ± Wenchuan Earthquake: evaluation of earthquake performance objectives and the importance of seismic conceptual design principlesWang Yayong Institute of Earthquake Engineering, China Academy of Building Research, Beijing 100013, China Abstract:
Many different types of buildings were severely damaged or collapsed during the
May 12, 2008 Great Wenchuan Earthquake. Based on survey data collected in
regions that were subjected to moderate to severe earthquake intensities, a
comparison between the observed building damage, and the three earthquake
performance objectives and seismic conceptual design principles specified by the
national ˇ°Code for Seismic Design of Buildings GB50011-2001,ˇ± was carried out.
Actual damage and predicted damage for a given earthquake level for different
types of structures is compared. Discussions on seismic conceptual design
principles, with respect to multiple defense lines, strong column-weak beam,
link beam of shear walls, ductility detailing of masonry structures, exits and
staircases, and nonstructural elements, etc. are carried out. Suggestions for
improving the seismic design of structures are also proposed. It is concluded
that the seismic performance objectives for three earthquake levels, i.e., ˇ°no
failure under minor earthquake level, ˇ± ˇ°repairable damage under moderate
earthquake levelˇ± and ˇ°no collapse under major earthquake levelˇ± can be achieved
if seismic design principles are carried out by strictly following the code
requirements and ensuring construction quality.
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