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Observations after 5/12/2008 Wenchuan Earthquake Based on Field Reconnaissance from 7/4/2008 to 7/7/2008

Observations after 5/12/2008 Wenchuan Earthquake Based on Field Reconnaissance from 7/4/2008 to 7/7/2008. Khalid M. Mosalam , PhD, PE mosalam@ce.berkeley.edu Professor and Vice Chair for Research and Technical Services Structural Engineering, Mechanics and Materials

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Observations after 5/12/2008 Wenchuan Earthquake Based on Field Reconnaissance from 7/4/2008 to 7/7/2008

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  1. Observations after 5/12/2008 Wenchuan Earthquake Based on Field Reconnaissance from 7/4/2008 to 7/7/2008 Khalid M. Mosalam, PhD, PE mosalam@ce.berkeley.edu Professor and Vice Chair for Research and Technical Services Structural Engineering, Mechanics and Materials Department of Civil and Environmental Engineering Acknowledgements Office of International Strategy Development, UC Office of the President (UCOP); Center for Information Technology Research in the Interest of Society (CITRIS), UC Berkeley; Prof. Jian-hui Deng, Prof. Bixiong Li, Prof. Ping Guan, and Prof. Shijing Yan, Sichuan University; Office of the President and International Office, Sichuan University, Chengdu, China

  2. Visited Cities Hanwang Hongbai Mianzhu Yingxiu epicenter Dujiangyan Shuimo Juyuan Xuankou N Hongkou Yingxiu Zipingpu Dujiangyan Xuankou Juyuan

  3. More Information … • Presentation file by Mosalam and Sitar: http://peer.berkeley.edu/pdf/5-12-Wenchuan-mosalam-sitar-new.pdf • Papers to appear in proceedings of 14WCEE, Beijing, 2008 • Li, B., Wang, Z., Mosalam, K.M., and Xie, H. (2008) “Wenchuan Earthquake Field Reconnaissance on Reinforced Concrete Framed Buildings With and Without Masonry Infill Walls,” Proceedings of 14WCEE, Beijing, 12-17, October, Paper #S31-035. • Li, B., Wang, Z., Mosalam, K.M., Wang, X., and Wei, Z. (2008) “Analysis of Stairwells Performance and Damage During Wenchuan Earthquake,” Proceedings of 14WCEE, Beijing, 12-17, October, Paper #S31-005.

  4. Dujiangyan Town (Poor vs. Good Performance) Building 1 East side Building 2

  5. Dujiangyan Town (Poor vs. Good Performance) Building 1 (6 story with “open” parking in first story) ~ 200 mm (8”) drift North side Column hinging

  6. Dujiangyan Town (Poor vs. Good Performance) Building 2 (5 story some infill walls in first story) First story infill cracking

  7. Seismic Performance of Stair Wells

  8. Performance of Stair Wells in Dujiangyan Town Photo by B. Li

  9. Concluding Remarks • Poor construction practice and inadequate seismic design levels† are the main reasons for most of the building collapses. • Short columns, strong-beam/weak-column, use of inconsistent masonry walls, disregard of infill walls in design are main reasons for the widespread damage in the epicenter region. • Types of stairwell damage when a building is shaken in the transverse direction (parallel to tread depth) are: • flexural damage in staircase treads, • shear damage at construction interface of staircase treads, • shear failure in landing beams • crushing in staircase treads/landing beams joints †On June, 19, 2007, China Earthquake Administration (CEA) modified the seismic zonation map for the affected region.

  10. Fault Trace in Hongkou Town SE side up > 2m

  11. RC Frame Failure Due to Faulting (Hongkou Town)

  12. Hongkou Bridge – Faulting Induced Collapse Thrust fault induced shears

  13. Good Performance of Long Period Structures Elevated water tank in Hanwang town Photo by K. Mosalam

  14. Thank You! Photo by K. Mosalam

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