Abstract
The post-disaster emergency rescue and loss evaluation hinges on the timeliness and accuracy of safety assessment of building structures in quake-hit regions. At present, the damage identification of quake-hit buildings in China is mainly conducted based on the experience of the experts. Such an assessment method will inevitably lead to the differences in identification results because each expert has his/her own subjective understanding of the degree of structural damage. In order to solve this problem, the low cyclic loading test of 7 specimens of shear wall is conducted and the hysteretic curves of seven shear walls are drawn. The failure modes and seismic performance of members under different design parameters (axial compression ratio of shear wall, shear span ratio, form of edge member, reinforcement ratio, stirrup ratio of coupling beam, and span height ratio) are compared. By recording the damage images taken at the controlled displacement under each level of load, the corresponding damage indexes are calculated, and the correspondence between the typical component damages and the damage indexes is discovered. After that, the images are compiled into an atlas. The authors calculate the damage index of the overall structure based on the damage indexes of the components and carries out damage identification of RC shear wall structure with the said damage index.
Highlights
The postseismic damage identification in China is mainly conducted based on the professional knowledge and practical experience of scholars and experts
In 2011, China issued the national standard for the postseismic identification of building safety: Post-earthquake field works-Part 2: Safety assessment of building [1]. e standard specifies the principles and methods for safety identification of buildings in the affected regions of a strong earthquake
For the purpose of solving the differences in the identification caused by the subjective reasons and developing a safety identification method for better quantification of the damage situation [2,3,4], the author carries out low cyclic loading test on shear wall, records the damage images taken at the controlled displacement under each level of load, and calculates the corresponding damage indexes. en, the correspondence between the macroscopic damages and the damage indexes is obtained, and the images are compiled into an atlas. e research provides a valuable reference for damage identification in quake-hit regions
Summary
The postseismic damage identification in China is mainly conducted based on the professional knowledge and practical experience of scholars and experts. E descriptive languages could be understood very differently, and they are too subjective to yield objective safety identification results According to these principles and methods, the same building may be given different identification conclusions. For the purpose of solving the differences in the identification caused by the subjective reasons and developing a safety identification method for better quantification of the damage situation [2,3,4], the author carries out low cyclic loading test on shear wall, records the damage images taken at the controlled displacement under each level of load, and calculates the corresponding damage indexes. Monotonic and low cycle cyclic loading tests are carried out by changing axial compression ratio, stirrup ratio of edge members, concrete strength, and loading mode to observe the change process of damage state and mechanical performance of members. Monotonic and low cycle cyclic loading tests are carried out by changing axial compression ratio, stirrup ratio of edge members, concrete strength, and loading mode to observe the change process of damage state and mechanical performance of members. e previous studies [11, 12] have a reference for this paper. e purpose of this paper is to record the corresponding damage phenomenon under each stage of loading conditions and find the corresponding relationship between the damage index and the damage phenomenon
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