配箍率对火灾后钢筋混凝土短柱力学性能影响试验

Experimental Study on Effect of Stirrup Ratio on Mechanical Behavior of Reinforced Concrete after Exposed to the Entire Period of Fire

为研究体积配箍率对火灾后钢筋混凝土短柱力学性能的影响,进行了3个常温和9个经历ISO834-1h标准火灾升降温全过程作用后的钢筋混凝土短柱轴压力学性能试验.研究了体积配箍率对钢筋混凝土短柱升降温过程中的变形性能及火灾后极限承载力、轴压刚度、延性等力学性能的影响.研究表明,随着体积配箍率的增大,火灾后构件的极限承载力、轴压刚度和延性均有不同程度的增大,而变形性能无明显变化.

In order to study the effect of stirrup ratio on the mechanical properties of reinforced concrete (RC) stub columns after fire, a performance research of the RC stub columns was carried out under the axial pressure after the action of the ISO834-1h standard fire temperature. The effects of the stirrup ratio on the deformation behavior of RC stub columns and the mechanical properties of post fire ultimate bearing capacity, axial compression stiffness and ductility were studied. The study shows that the ultimate bearing capacity, axial stiffness and ductility of the columns intensified in different degrees with the increase of the stirrup ratio, but it has little influence on the deformation.