EXPERIMENTAL STUDY ON RESIDUAL LOAD BEARING CAPASITY OF SRC BEAMS AFTER EXPOSURE TO FIRE
This paper provided four test data pertaining to the mechanical properties of steel reinforced concrete (SRC) beams after exposure to fire. One parameter,that is,shear span ratio is mainly taken into consideration. The failure patterns and strain distribution along the height of cross-section as well as load versus deflection curves and residual load bearing capacity of the specimens are obtained by tests. Tests results indicate that the failure mode of SRC beam after exposure to fire under load is similar to that of room temperature,but after experienced fire temperature,web-shear crack of SRC beam appears earlier. In the stage of initial loading,the stain along the section height of the beams with bending-damage is linear distribution. But after about eighty percent of ultimate load,with the effect of concrete cracking at the compression area and relative slip between steel compressed flange and concrete,the stain of concrete at compression edge of section increase slower,section stain distribution far from linear,plane section principle incomplete suited. The load versus mid-span deflection curve of all specimens have a long horizontal section after yielding,which show that SRC beam after fire have good deformation capacity after the ultimate load. According to experiment results and calculation results by JGJ specification,the diagonal shear strength of specimens after fire compared with that in room temperature reduce from min of 10％ to max of 37％; while bending capacity of cross section reduce 22％.The shear strength of SRC beam after fire reduces relatively to the shear span ratio,and specimen with smaller shear span ratio has a more high residual capacity level.
Steel reinforced concrete (SRC) Beams After fire Residual load bearing capacity
Jun-Hua Li Yue-Feng Tang Ming-Zhe Liu
College of Architectural Engineering and Environment,Ningbo University,Ningbo 315211,P.R.China College of Architectural Engineering and Environment,Ningbo University,Ningbo 315211,P.R. China
国际会议
The Eleventh International Symposium on Structural Engineering(第十一届结构工程国际研讨会)
广州
英文
2241-2246
2010-12-01（万方平台首次上网日期，不代表论文的发表时间）