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Seismic Performance of Reinforced Concrete Wall Structures Under High Axial Load with Particular Application to Low-To Moderate Seismic Regions



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Seismic Performance of Reinforced Concrete Wall Structures Under High Axial Load with Particular Application to Low-To Moderate Seismic Regions by Sze-Man Wong
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This dissertation, "Seismic Performance of Reinforced Concrete Wall Structures Under High Axial Load With Particular Application to Low-to Moderate Seismic Regions" by Sze-man, Wong, 黃思敏, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled Seismic Performance of Reinforced Concrete Wall Structures under High Axial Load with Particular Application to Low-to-Moderate Seismic Regions Submitted by Wong Sze Man For the degree of Master of Philosophy at The University of Hong Kong in December 2005 Hong Kong is a densely-populated city that is located in a region classified as having low-to-moderate seismicity. Previous studies suggest that it is not unlikely for Hong Kong to be subject to a far-field, large magnitude earthquake. Considering the potential economic and property loss to the territory, proper assessments of buildings in Hong Kong's urban area are urgently required. Accordingly, the aim of this study is to evaluate the seismic performance of reinforced concrete (RC) shear walls, a common structural element adopted in the construction of medium-rise residential buildings in Hong Kong. This thesis has identified axial load ratio (ALR) as an indispensable parameter for consideration in seismic performance evaluation. The ALRs in the wall elements of the medium-rise residential buildings were investigated. It was found that the ratios ranged up to 0.3 and 0.45 for shear-wall and core-wall buildings respectively. Effective yield curvature was extensively analyzed using a FORTRAN program. An empirical model, which is valid to the practical range of ALRs concluded, is proposed to provide quick estimations to the effective yield curvature that are useful for assessment purposes when combined with the Yield Point Spectra (YPS). The behaviour of RC walls fabricated in accordance with common construction practice in Hong Kong was critically examined experimentally. In addition to conventional instrumentations, the optical Digital Speckle Correlation Method (DSCM) was adopted in the study. The effects of ALR and confinement on failure mode, ductility capacity, strength degradation, and axial load capacity were investigated. It was found that the effect of ALR should not be neglected in a seismic assessment. In addition, the performance of the specimens before and after the retrofitting measures was also compared, and advantages of using the DSCM were identified. Analysis of the research findings prompts the need for a revision of the performance level criteria that cater for high ALR scenarios. Based on the revised criteria, a case study was conducted, which compared the seismic capacity and demand on YPS. Displacement ductility demands were negligible when ALRs were low, but high ALR cases were accompanied by an Immediate Occupancy or Life Safety performance level. (349 words) DOI: 10.5353/th_b3473953 Subjects: Concrete walls - Earthquake effectsShear walls - Earthquake effectsConcrete walls - TestingShear walls - Testing
Release date NZ
January 26th, 2017
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Country of Publication
United States
colour illustrations
Open Dissertation Press
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