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通过14个钢管超高强石渣混凝土短柱试件的轴压试验,考察其破坏形态,分析混凝土强度、试件的直径、径厚比等参数对其力学特性的影响。试验结果表明:以较低的水泥消耗量配制的超高强石渣混凝土填充至钢管内,钢管与核心混凝土界面密实,没有脱空的现象;在试验参数范围内,试件的套箍指标和混凝土强度是影响其静力特性的主要因素,试件的峰值荷载、低谷荷载及二次峰值荷载与核心混凝土的名义承载力(fcAc)之比基本与套箍指标成线性关系,但变化规律有别;试件的荷载-轴向平均应变曲线可以分为四个阶段,即弹性阶段、弹塑性阶段、荷载下降阶段和荷载回升阶段;套箍指标较小时,弹塑性段较短,下降段陡峭,峰值荷载后荷载下降幅值较大;套箍指标较大时,弹塑性上升段和荷载下降变形曲线较平缓,峰值荷载后荷载下降幅值较小;所有试件都呈剪切型的破坏特征,有较高的残余承载力和良好的延性;最后,给出了经回归分析得到与试验结果比较吻合的钢管超高强石渣混凝土短柱轴心受压承载力的计算公式。
Through the axial compression tests of 14 specimens of super-strength steel-concrete column specimens, the failure modes were investigated. The effects of concrete strength, specimen diameter and diameter-thickness ratio on the mechanical properties were analyzed. The test results show that the ultra-high-strength gravel concrete formulated with lower cement consumption is filled into the steel pipe and the interface between the steel pipe and the core concrete is dense without cavitation. Within the parameters of the test, the hoop index of the test piece and the concrete The strength is the main factor that affects the static characteristics. The ratio of peak load, trough load and secondary peak load to the nominal concrete carrying capacity (fcAc) of the core concrete is basically linear with the cuff index, but the variation rule is different The load-axial average strain curve of the specimen can be divided into four stages: elastic stage, elastoplastic stage, load descent stage and load recovery stage. When the hoop index is small, the elastic-plastic section is short and the descending section is steep, When the hoop index is larger, the curve of elastic-plastic ascending and descending curve is more gentle, and the descending amplitude of load after the peak load is smaller. All the specimens have the characteristics of shear-type destructive , Which has higher residual bearing capacity and good ductility. Finally, the axial compressive bearing capacity of super-strength steel-reinforced concrete short column with regression analysis is obtained. Formula.