【摘要】 文章通过一榀一跨三层预压装配式预应力混凝土框架在低周反复荷载作用下的试验研究,探讨了预压装配式预应力混凝土框架梁端的受力性能、滞回曲线、延性特征及耗能能力等抗震性能。试验研究表明,框架梁端组合截面发生弯曲破坏时,梁截面中和轴位置稳定,截面变形符合平截面假定;梁端截面仅依靠预应力筋承受弯矩,截面延性系数在3.64~5.62之间,具有较好的转动能力和延性;在跨中竖向荷载持续作用下,梁端负弯矩产生的曲率恢复滞后,残余变形产生积累效应。更多还原

【Abstract】 A single-span three-storey pre-stressed fabricated PC frame was tested under low-reversed cyclic loading,and the experimental studies were carried out to investigate the load-bearing capacity,the hysteresis curves,the ductility and energy dissipation of the PC specimens.The results of test show that the neutral axis position of beam cross-section keeps stable and cross-section deformation meets the plane-section assumption when the combination cross-section of beam-ends get bending damage.The beam-ends relying on only pre-stressed wires to bear the moment have better rotation capacity and ductility,and the curvature ductility coefficient is between 3.64 and 5.62.Under the continuing action of mid-span vertical load,the curvature recovery generated by the negative moment of beam-ends lags behind and residual deformation produces cumulative effects.更多还原