低周反复荷载作用了钢筋混凝土框架的延性和强度
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摘要
本文根据4榀钢筋混凝土门式刚架和1榀单跨两层钢筋混凝土框架不变竖向加载和低周反复水平加载的试验结果,讨论了若干影响框架延性和强度的因素,提出了确定截面屈服曲率与极限曲率、等效塑性铰长度和节点内锚固钢筋粘结滑移的经验公式。借助于曲率面积矩原理和侧移机构的虚位移原理,相应地推导了框架极限位移和强度的计算公式。文中所提出的公式均与试验结果符合较好。
From the experimental results of four models of RC portal frames and one model of single-span two-storey RC frame subjected to constant vertical and low cyclic horizontal loading. the factors which have influence on the ductility and strength of frames are discussed, and some empirical formulas for determining the yield and ultimate curvature of section, the equivalent length of plastic hinge and the bond slip of anchored bar in joint are presented. By means of the moment-area theorem and priciple of virtual displacement for sidesway mechanism, the formulas for calculating the ultimate displacement and strength of frames are derived, respectively, and the calculated results are in good agreement with the experimental ones.
From the experimental results of four models of RC portal frames and one model of single-span two-storey RC frame subjected to constant vertical and low cyclic horizontal loading. the factors which have influence on the ductility and strength of frames are discussed, and some empirical formulas for determining the yield and ultimate curvature of section, the equivalent length of plastic hinge and the bond slip of anchored bar in joint are presented. By means of the moment-area theorem and priciple of virtual displacement for sidesway mechanism, the formulas for calculating the ultimate displacement and strength of frames are derived, respectively, and the calculated results are in good agreement with the experimental ones.
引文
1 陈寿梁等.建筑抗震设计规范(GBJll-89) 统一培训教材.北京:地震出版社,1990:220～224
2 高振世,庞同和.钢筋混凝土框架单元的延性和塑性铰性能.南京工学院学报,1987;17(1) :106～117
3 高振世,庞同和.钢筋混凝上框架单元延性和锚固钢筋粘结滑移性能的试验研究.南京工学院学报,1985;15(4) :53～60
4 Park R, Paulay T. Reinforced Concrete Stuctures. New York: John Wiley＆Sons, 1975: 27～28
2 高振世,庞同和.钢筋混凝土框架单元的延性和塑性铰性能.南京工学院学报,1987;17(1) :106～117
3 高振世,庞同和.钢筋混凝上框架单元延性和锚固钢筋粘结滑移性能的试验研究.南京工学院学报,1985;15(4) :53～60
4 Park R, Paulay T. Reinforced Concrete Stuctures. New York: John Wiley＆Sons, 1975: 27～28
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