预压装配式预应力混凝土框架梁端延性特征及耗能能力
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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。
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.
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.
引文
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[3]柳炳康,施法科,刘海涛,等.反复荷载下预压装配式框架接合部受力性能[J].合肥工业大学学报:自然科学版,2005,28(1):71-74.
[4]傅传国,娄宇.预应力型钢混凝土结构试验研究及工程应用[M].北京:科学出版社,2007:86-108.
[5]潘其健.预制预应力混凝土框架结构抗震能力的试验研究[D].南京:东南大学土木工程学院,2006.
[6]薛伟辰,程斌,李杰.低周反复荷载下预应力高性能混凝土梁的抗震性能[J].地震工程和工程振动,2003,23(1):78-83.
[7]过镇海,时旭东.钢筋混凝土原理和分析[M].北京:清华大学出版社,2003:334-353.
[8]房贞政,陈勇,郑则群.无粘结预应力混凝土框架节点拟静力试验研究[J].建筑结构,2003,33(5):10-12.
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