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目的试验研究翼缘削弱型钢筋混凝土框架梁柱节点的受力性能,考查翼缘削弱程度以及削弱方式对其受力性能影响.方法在钢筋混凝土梁端翼缘内预埋刚度调节盒,使得梁端塑性铰外移,通过制造6个翼缘削弱型钢筋混凝土框架梁柱节点模型试件,并对试件进行拟静力试验,研究该类型节点的破坏机理;通过改变梁端翼缘内预埋刚度调节盒的数量和方式等参数,考察该类型节点破坏的主要影响因素.结果梁翼缘预埋刚度调节盒对框架梁刚度的调节明显;梁端塑性铰出现在刚度调节盒所处位置,可实现塑性铰外移;试验测得节点的位移延性系数均不小于5.3,抗震性能较好.结论翼缘削弱型钢筋混凝土框架梁柱节点可明显改善普通梁柱节点的抗震性能,通过在梁柱节点翼缘处设置适当数量的刚度调节盒,可更易实现“强柱弱梁”的抗震设防目标.
Aim To study the mechanical behavior of beam-column joints of flange-frangible reinforced concrete frame and to study the effect of weakening of flanges and the way of weakening on their mechanical properties.Methods Stiffness adjusting box was embedded in the end flanges of reinforced concrete beams, By means of the hinge outward movement, six specimens of flange-weakening reinforced concrete frame-column joints were fabricated and the quasi-static tests were carried out on the specimens to study the failure mechanism of the joints. By changing the embedded stiffness adjustment box The number and the method of the type, the main influencing factors of this type of node failure were inspected.Results The stiffness adjustment box with prefabricated rigidity of the beam flange was able to adjust the stiffness of the frame beam obviously, and the plastic hinge of the beam end appeared at the position of the stiffness adjusting box, The displacement ductility coefficients of the joints are not less than 5.3 and the seismic performance is better.Conclusion The beam-column joints of flange-weakening reinforced concrete frame can obviously improve the seismic performance of common beam-column joints, Set the appropriate number of stiffness adjustment box, can be easier to achieve “strong column weak beam ” seismic fortification goals.