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通过改进部分组合梁的系杆配置,设计了2个部分组合梁,研究了该梁在纯弯与剪弯受力状态下的滞回性能,分析了部分组合梁的承载能力、变形能力及耗能能力。试验结果表明:部分组合梁的受压翼缘在弹性阶段内没有屈曲,混凝土的存在提高了受压翼缘的屈曲承载力;部分组合梁在往复加载条件下滞回性能类似于钢梁,其滞回曲线较为饱满,捏缩现象不明显;试验骨架曲线与单调曲线较为吻合,混凝土压溃与剥落会引起部分组合梁的承载能力下降;部分组合梁的试验实测承载能力与采用边缘屈服准则及全截面塑性准则计算得到的理论值较为接近,采用以上两种准则来估计类似截面配置的部分组合梁的承载力是可行的;试件的转角延性系数在4~5之间,耗能系数在2.5左右,表明部分组合梁具有较好的抗震性能。
By improving the tie-rod configuration of partial composite beams, two partial composite beams are designed and the hysteretic behavior of the beam under pure bending and shear bending is studied. The bearing capacity, deformation capacity and energy dissipation capacity of some composite beams are analyzed. . The experimental results show that the compression flanges of some composite beams have no buckling in the elastic phase, and the presence of concrete increases the buckling capacity of the compression flanges. The hysteretic behavior of some composite beams is similar to that of steel beams under reciprocating loading The curve of hysteresis curve is quite full and the phenomenon of pinch shrinkage is not obvious. The curve of the test skeleton is in good agreement with the monotonous curve. The crushing and exfoliation of concrete will cause the bearing capacity of some composite beams to decrease. The measured bearing capacity and edge yield criterion of some composite beams and It is feasible to use the above two criteria to estimate the bearing capacity of some composite beams with similar section configuration. The corner ductility coefficient of the specimen is between 4 and 5, and the energy dissipation coefficient is between 2.5 or so, indicating that some composite beams have better seismic performance.