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根据6根外包钢板-混凝土组合连梁试件的应变量测数据,计算得到了不同荷载水平下的钢板应力,并通过应力积分和截面内力平衡方程,得到了外包钢板和内填混凝土承担的各内力分量。结果表明:连梁钢腹板的屈服均先于或几乎与钢翼缘同时屈服。试件钢板开始屈服时的连梁剪力与峰值剪力的比值在0.61~0.76之间。达到峰值剪力时,除试件CFSCB-5外的其他试件的钢板都发生了明显的强化;钢腹板75%以上的区域的轴向正应力为拉应力,且靠近受压翼缘处的剪应力大于靠近受拉翼缘处的剪应力。连梁的外包钢板承担的剪力和弯矩比例在加载过程中会发生变化。在接近峰值剪力时,各试件的外包钢板承担的剪力比例在31%~60%之间,承担的弯矩比例在57%~87%之间;混凝土的剪力-轴压比与相应的连梁对角线与梁轴线的夹角的正切值接近。
According to the strain measurement data of six steel-concrete composite beam specimens, the stress of the steel sheet under different loading levels was calculated. Through the stress integral and the internal force balance equation of the steel-encased concrete, Internal force component. The results show that the yielding of the web of the web with beam even before or almost simultaneously with the steel flange. The ratio of the shear strength to the peak shearing force at the beginning of yielding of the test steel was between 0.61 and 0.76. When the peak shear force is reached, the steel plates of all the specimens except for the CFSCB-5 specimens have been strengthened obviously. The axial normal stress in the area above 75% of the steel webs is the tensile stress and is close to the compression flange The shear stress is greater than the shear stress near the tension flange. The ratio of shear and bending moment to the outsourced steel plate with the beam changes during the loading process. Near the peak shearing force, the shearing force of the outsourced steel plates in each specimen ranged from 31% to 60% and the bending moment ratio in the range from 57% to 87%. The shear-axial compression ratio and The corresponding tangent of the angle between the diagonals of the connecting beam and the axis of the beam is close.