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EXPERIMENTAL RESEARCH ON SEISMIC PROPERTIES OF PRESTRESSED CONCRETE BEAMS IN SIMULATED ACID RAIN
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摘要: 为研究酸雨腐蚀环境下预应力混凝土梁的抗震性能，对8根预应力混凝土梁试件进行低周反复加载试验，重点研究试件梁的破坏形态以及不同参数下梁的滞回曲线、骨架曲线、延性、耗能能力和刚度退化等方面的特点，探讨混凝土强度等级、预应力度、钢绞线腐蚀率对其抗震性能的影响。试验结果表明：预应力混凝土梁在加载过程中都会经历弹性、屈服、破坏阶段；预应力混凝土梁的滞回曲线均较为饱满，残余变形较大，有较好的抗震能力；钢绞线的腐蚀率对抗震性能影响较为显著，随着钢绞线腐蚀率的增大，试验梁的极限承载力下降；加载循环的次数不断减少，同时滞回曲线的饱满程度不断降低。Abstract: In order to study seismic properties of prestressed concrete beams in acid rain corrosion environment, the quasi-static loading tests on 8 prestressed concrete beam specimens were conducted, the failure modes of specimens and the characteristics of the hysteresis curve, skeleton curve, ductility, energy dissipation capacity and stiffness degradation of the beams with different parameters were studied, the effects of concrete strength grades, prestressed levels, and corrosion rates of steel strands on its seismic properties were discussed.The experiment study indicated that prestressed concrete beams during the loading process experienced the stage of elasticity, yield and failure; the hysteresis curves of the prestressed concrete beams were relatively full, the residual deformation was larger and the seismic behaviors were better. The corrosion rate of the steel strand had the greatest impact on the seismic properties. With the increase of the corrosion rate, the ultimate bearing capaicty of the test beams decreased, the hysteretic curve fullness and the cycles of loading decreased constantly.
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Key words:
- prestressed concrete /
- acid rain corrosion /
- seismic behavior /
- failure mode
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