Title:
Seismic Design of Columns and Walls on Weak First Floor in Piloti-Type Bearing Wall Buildings
Author(s):
Seung-Jae Lee and Tae-Sung Eom
Publication:
Structural Journal
Volume:
117
Issue:
6
Appears on pages(s):
183-193
Keywords:
nonlinear static analysis; piloti; seismic design; soft story; torsional irregularity; wall; weak story
DOI:
10.14359/51728066
Date:
11/1/2020
Abstract:
This study investigated the seismic vulnerability of piloti-type bearing wall buildings supported by columns and walls on a weak first floor. Linear and nonlinear static analyses were performed to investigate the contributions of the columns and walls to lateral strength and stiffness, depending on torsional irregularity. The results show that the columns and walls were dominated by flexure and in-plane shear, respectively. Before yielding, the walls resisting in-plane shear mainly contributed to the stiffness and strength of the buildings; as shear cracking and yielding of the walls occurred, the contribution of the columns to the strength increased. Thus, during the inelastic behavior, the columns significantly contributed to the peak strength and ductility. Based on the results, design and detailing requirements for the columns and walls on a weak first floor were proposed. The validity of the proposed method was verified
through nonlinear static and dynamic analyses.
Related References:
ACI Committee 318, 2014, “Building Code Requirements for Structural Concrete (ACI 318-14),” American Concrete Institute, Farmington Hills, MI, 524 pp.
ASCE/SEI 41-17, 2017, “Seismic Evaluation and Retrofit of Existing Buildings,” American Society of Civil Engineers, Reston, VA, 623 pp.
ASCE/SEI 7-16, 2016, “Minimum Design Loads and Associated Criteria for Buildings and Other Structures,” American Society of Civil Engineers, Reston, VA, 889 pp.
Architectural Institute of Korea, 2018, “Development of Earthquake Damage Prevention Measures for Building Structures with Pilotis,” The Ministry of Land, Infrastructure, and Transport of Korea, Sejong, Korea.
Architectural Institute of Korea, 2016, “Korean Building Code and Commentary (KBC 2016),” Architectural Institute of Korea, Seoul, Korea, 1222 pp.
Applied Technology Council, 1996, “Seismic Analysis and Retrofit of Concrete Buildings (ATC-40),” Applied Technology Council, Redwood City, CA.
Applied Technology Council, 2005, Improvement of Nonlinear Static Seismic Analysis Procedures, FEMA-440, Federal Emergency Management Agency.
Bentz, E. C.; Vecchio, F. J.; and Collins, M. P., 2006, “Simplified Modified Compression Field Theory for Calculating Shear Strength of Reinforced Concrete Elements,” ACI Structural Journal, V. 103, No. 4, July-Aug., pp. 614-624.
Collins, M. P., and Mitchell, D., 1980, “Design Proposals for Shear and Torsion,” Journal – Prestressed Concrete Institute, V. 25, No. 5, 70 pp.
Computer and Structures Inc, 2011, Perform-3D: Nonlinear Analysis and Performance Assessment for 3D Structures, User Guide Version 5, Berkeley, CA.
Esfandiari, A., 2009, “Shear Strength of Structural Concrete Members Using a Uniform Shear Element Approach,” PhD dissertation, University of British Columbia, Vancouver, BC, Canada.
Eom, T.-S.; Lee, S.-J.; and Park, H.-G., 2019, “Structural Damage Investigation of Bearing Wall Buildings with Piloti Configuration by 2017 Pohang Earthquake,” Journal of Earthquake Engineering, V. 23, No. 1, pp. 9-18. (in Korean)
Kim, T.-W.; Chu, Y.-R.; Kim, S.-R.; and Bhandari, D., 2018, “Seismic Behavior of Domestic Piloti-Type Buildings Damaged by 2017 Pohang Earthquake,” Journal of Earthquake Engineering, V. 22, No. 3, pp. 161-168. (in Korean)
Ko, D.-W., and Lee, H.-S., 2006, “Shaking Table Tests on a High‐Rise RC Building Model Having Torsional Eccentricity in Soft Lower Storeys,” Earthquake Engineering and Structural Dynamics, V. 35, No. 11, pp. 1425-1451. doi: 10.1002/eqe.590
Ko, D.-W., and Lee, H.-S., 2007, “Correlation of Experimental and Analytical Inelastic Responses of 1:12 Scale Irregular High-Rise RC Buildings,” Journal of Earthquake Engineering, V. 11, No. 2, pp. 95-104. (in Korean)
Ko, D.-W., and Lee, H.-S., 2009, “Nonlinear Time History Analysis of Piloti-Type High-Rise RC Buildings,” Journal of Earthquake Engineering, V. 13, No. 1, pp. 35-43. (in Korean)
Lee, H. S., and Ko, D. W., 2002, “Shaking Table Tests of a High-Rise RC Bearing-Wall Structure with Bottom Piloti Stories,” Journal of Asian Architecture and Building Engineering, V. 1, No. 1, pp. 47-54. doi: 10.3130/jaabe.1.47
Lee, H. S., and Ko, D. W., 2007, “Seismic Response Characteristics of High-Rise RC Wall Buildings Having Different Irregularities in Lower Stories,” Engineering Structures, V. 29, No. 11, pp. 3149-3167. doi: 10.1016/j.engstruct.2007.02.014
Lee, H.-S.; Lee, J.-J.; and Jung, D.-W., 2008, “Analytical Simulation of the Seismic Response of a High-Rise RC Building Model,” Journal of Earthquake Engineering, V. 12, No. 5, pp. 1-10. (in Korean)
Lee, H. S.; Jung, D. W.; Lee, K. B.; Kim, H. C.; and Lee, K., 2011, “Shake-Table Responses of a Low-Rise RC Building Model Having Irregularities at First Story,” Structural Engineering and Mechanics, V. 40, No. 4, pp. 517-539. doi: 10.12989/sem.2011.40.4.517
Lee, H. S.; Lee, K. B.; Hwang, K. R.; and Cho, C. S., 2013a, “Shake Table Responses of an RC Low-Rise Building Model Strengthened with Buckling Restrained Braces at Ground Story,” Earthquakes and Structures, V. 5, No. 6, pp. 703-731. doi: 10.12989/eas.2013.5.6.703
Lee, H. S.; Kang, C. B.; Jeong, G. H.; Lee, S. H.; and Oh, S. H., 2013b, “Earthquake Simulation Tests on a 1:5 Scale 9-Story Piloti-Type RC Residential Building Model,” 5th International Conference on Advances in Experimental Structural Engineering, Taipei, Taiwan.
Lee, H.-S., 2015, “Seismic Design Implications for Low-to-Moderate Seismicity Regions from Earthquake Simulation Tests on RC Building Structures in Korea (Invited Paper),” Proceedings of the 2015 World Congress on Advances in Structural Engineering and Mechanics (ASEM 15), Incheon, Korea.
Lee, H.-S., and Hwang, K.-R., 2015, “Torsion Design Implications from Shake‐Table Responses of an RC Low‐Rise Building Model Having Irregularities at the Ground Story,” Earthquake Engineering and Structural Dynamics, V. 44, No. 6, pp. 907-927. doi: 10.1002/eqe.2492
Oh, S. H., 2017, Pohang Earthquake Damage Report and Policy Proposal, Proceedings of Seminar on Earthquake Damage of Building Structures in Korea and Japan: Report on 2017 Pohang Earthquake, Architectural Institute of Korea.