|Table of Contents|

Seismic Performance of Post-fire RC Columns with Pre-load(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2019年05期
Page:
21-30
Research Field:
Publishing date:

Info

Title:
Seismic Performance of Post-fire RC Columns with Pre-load
Author(s):
HUO jing-si1; 2;  YANG Xin-xin1;  LI Zhi1
(1. Key Laboratory of Building Safety and Energy Efficiency of Ministry of Education, Hunan University, Changsha 410082, Hunan, China; 2. Fujian Provincial Key Laboratory of Intelliguent Infrastructure and Monitoring, Huaqiao University, Xiamen 361021, Fujian, China)
Keywords:
RC column;  high temperature;  seismic performance;  pre-load;  size effect;  axial compression ratio
PACS:
TU375.3
DOI:
-
Abstract:
In order to study the effects of pre-loads on the seismic performance of post-fire reinforced concrete(RC)columns, the cyclic loading tests were carried out on three RC columns after high temperature and two specimens at room temperature, respectively. By comparing and analyzing the variation of temperature field, hysteresis curve, skeleton curve and failure mode of specimens under different pre-loads, the effects of different pre-loads and high temperature cooling process on failure mode, residual deformation, residual bearing capacity, flexural stiffness and ductility, and energy dissipation capacity of reinforced concrete columns were emphatically studied. The results show that the effect of pre-load on seismic behavior of reinforced concrete columns after high temperature is significant, and there is a certain size effect. When the pre-load is applied, with the increase of the axial compression ratio, the failure modes of specimens change from bending failure to crushing failure after high temperature. The pre-load not only affects the temperature field of the column section, but also causes the residual compressive deformation of the specimen after high temperature. The larger the axial compression ratio is, the larger the residual compression deformation is, the larger the residual bearing capacity and flexural rigidity are, while the ductility and energy dissipation capacity show a downward trend. High temperature cooling makes the bearing capacity, flexural rigidity, ductility and energy dissipation capacity of the specimens degenerate to varying degrees. It is suggested that the influence of pre-load and size effect should be reasonably considered in damage assessment and seismic performance study of reinforced concrete columns after fire.

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Last Update: 2019-09-29