Experimental Study on Retrofit of School Building by Adding Reinforced Concrete Shear Wall with Opening
Date Issued
2015
Date
2015
Author(s)
Chang, Ting-Yu
Abstract
Lots of elementary and secondary school buildings were damaged by the devastating 921 Chi-Chi earthquake, so scholars proposed methods for increasing the seismic performance of school buildings. Adding shear wall method is a common method to be used in school buildings retrofit. However, by the use of retrofit of adding shear wall, it is difficult to satisfy the lighting and ventilation requirements for school building. Consequently, National Center for Research on Earthquake Engineering (NCREE) planned a series of specimens retrofitted by RC walls with window and door opening to study the feasibility of the proposed method. The specimens were designed according to existing school buildings. In order to comply with existing schools buildings, two common spans, 300 cm and 420 cm, were considered in the experimental plan. This experiment includes eight specimens, which are two bare-frame specimens and six retrofitted specimens. Considering the lighting and ventilation of school buildings, large opening is main principle. Also, the specimen was designed in symmetric configuration, in order to facilitate and establish an effective and reliable seismic evaluation method of RC walls with openings for engineers in the future. Experimental results show that the large-opening specimens can enhance about 3.8 times of lateral strength, at least 13 times of stiffness; the small-opening specimens can enhance about 6.8 times of lateral strength, at least 34 times of stiffness. Drift ratio of all specimens can be up to 2%, it means that the retrofit by RC wall with opening can be applied directly to the low-rise school buildings. The force-displacement curves of all specimens are predicted base on the third-edition Evaluation and Retrofit Handbook for School Buildings. All prediction results are conservative after modification.
Subjects
school buildings
RC wall with openings
retrofit
Type
thesis
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