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进行了6根方钢管钢骨高强混凝土压弯剪试件的试验研究。试验参数为轴压比、剪跨比及配骨指标。试验结果表明:在试验轴压比范围内,随着轴压比及配骨指标的增长,承载力逐渐增加;随着剪跨比的减小,抗剪承载力迅速增加,构件明显呈现剪切破坏特征。通过有限元法建立的计算模型,其计算结果经回归分析,得出了纯剪、压弯剪、压弯构件的界限剪跨比限值及实用的压弯剪构件极限承载力计算公式。在试验参数范围内,公式计算结果与试验结果吻合较好。
Six square steel tube high strength concrete specimens were tested. Experimental parameters for the axial compression ratio, shear span ratio and bone index. The experimental results show that the bearing capacity increases with the increase of axial compression ratio and the increase of the bone index within the range of the axial compression ratio. With the reduction of the shear-span ratio, the shear strength increases rapidly and the member obviously shows shear Destroy characteristics. Through the calculation model established by the finite element method and the calculation results obtained through regression analysis, the limit shear span ratio limits of pure shear, compression bending and bending and compression bending members and practical formula for calculating the ultimate bearing capacity of the members are obtained. Within the range of experimental parameters, the calculated results are in good agreement with the experimental results.