Damage evolution process of RC frame under earthquake excitation(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2019年03期
- Page:
- 74-83
- Research Field:
- 桥梁与隧道工程
- Publishing date:
Info
- Title:
- Damage evolution process of RC frame under earthquake excitation
- Author(s):
- SU Jizhi; LIU Boquan; XING Guohua; MA Yudong; SONG Meng
- (School of Civil Engineering, Changan University, Xian 710061, Shaanxi, China)
- Keywords:
- structural engineering; damage index model; RC frame structure; weighted coefficient; energy dissipation and storage capability
- PACS:
- -
- DOI:
- -
- Abstract:
- In order to clarify theseismic collapse mechanism of RC frame structures and control their failure path,the damage degree of component, storey, and structure was quantitatively studied based on a 1/3scale model of threestorey and threebay frame, was carried out under low reversed cyclic loading. The influence of component damage was analyzed and the relationship between different levels was discussed on the seismic behavior of structure. The results show that the damage degree of the bottom members is generally greater than that of the top ones when the structure collapses. The average damage indexes of columns in different stories are 0.97, 0.62, 0.15, and those of beams are 0.95, 0.86, 0.74, respectively. The cumulative damage of the structure develops from the bottom to the top. As the energy dissipation member, the frame beams are damaged before the columns, with more serious degree and uniform distribution along the floor. The damage distribution of columns along the floor is relatively concentrated. When the structure collapses, the damage indexes in the first story are larger than those of the upper ones, about 8.89%, 21.06% of beams and 26.56%, 62.93% of columns.When the load displacement is small, the structure relies on horizontal components to consume seismic energy, however, it gradually relies on vertical components as the displacement amplitude and cycle number increase. The damage development curves of beams and columns show a convex and concave tendency, respectively. The damage model proposed from the perspective of structural energy dissipation is more consistent with the nature of structural seismic resistance, with fewer unknown parameters, and the calculation results can accurately reflect the damage state of the structure at different performance levels. 2 tabs, 14 figs, 25 refs.
Last Update: 2019-05-23