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EXPERIMENTAL STUDY ON THE CREEP EFFECT OF THE EXPANSIVE AGENT AND RECYCLED CFST COLUMN IN CONSTRUCTION
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摘要: 实际施工中钢管混凝土的分层施工，以及为弥补收缩而使用的膨胀剂产生的徐变对钢管混凝土的性能影响不容忽视。在考虑钢管混凝土分阶段施工的基础上，分级施加徐变恒载。试验研究了膨胀剂掺量以及恒载加载间隔对钢管混凝土极限承载力与徐变纵向变形的影响，同时还对钢管再生混凝土结构的相应问题进行研究。分析得出：膨胀剂的使用对普通钢管混凝土的极限承载力有提高作用，膨胀剂掺量增大时，徐变变形也有所增大。恒载施加间隔较大时，钢管混凝土的徐变变形幅值显著减小，而其对钢管混凝土的极限强度影响相对却不明显。相比之下，膨胀剂对钢管再生混凝土的徐变变形影响更大，变形呈比例增大，而对极限承载力的影响却较小。Abstract: In the practical construction of a concrete-filled steel tube(CFST)column, the effect of the creep on the CFST performance can not be ignored, which caused by the stratified construction as well as the using of expansive agent to remedy the shrinkage of the concrete.Based on the simulation the stratified construction, a series of experiments were conducted to study effect of the expansive agent dosage on the ultimate bearing capacity of CFST columns and the creep deformation in the longitudinal direction.Also the corresponding properties of the regeneration aggregate concrete filled steel tube(RACFST)have been studied.It has been found that the ultimate bearing capacity of the CFST column can be increased greatly when using more expansive agent, as well as the creep deformation.And the time-interval between two dead-loads also makes a large influence on the creep performance of the CFST column, when the time-interval increases, the amplitude of the creep deformation gets a remarkable decreasing.In contrast, it is a greater influence on the deformation of the RACFST column than the CFST one, and a smaller influence on the ultimate bearing capacity.
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Key words:
- CFST column /
- the expansive agent /
- creep /
- multi-stage loading /
- recyled aggregate concrete
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