摘要
介绍了5个1/4缩尺的钢筋混凝土板柱中节点试件在低周反复水平荷载作用下的受力全过程、开裂荷载、最大荷载、破坏荷载以及弯曲破坏和冲切破坏两种破坏形态等,给出了5个试件的滞回环曲线、骨架曲线以及沿板宽的钢筋应变曲线。在理论分析中,根据板在跨度l1的固定端截面处沿板宽l2方向的转角分布要比其他截面平缓的现象,提出了等代梁是变宽度的概念,并给出了等代梁的等效宽度系数α的计算公式,其结果与试验值比较接近。此外,还给出了节点破坏形态的判别公式,并用试验结果进行了验证。研究表明,我国抗震规范规定的等代梁计算宽度是合理的,偏于安全;钢筋混凝土板柱节点的耗能能力很小,抗震性能差。
This paper introduces the test results of five 1/4-scale interior column joint specimens subjected to low-cycle reversed horizontal load, including the whole process, the values of cracking load, maximum load, failure load and two failure modes which are the flexural failure and the punching shear failure. Meanwhile the hysterisis loops, skeleton curves and the strain curves of steel bars along the slab width are also given. In the theoretical analysis, according to the phenomenon that the variations of rotational angle in the direction l2 which is smaller at the fixed end cross section than that at other cross sections in span l1, the paper puts forward the conception of varying width for the equivalent beam and gives out the calculating formulas of the coefficient for the equivalent beam width. The calculated results match well with the test results. Moreover, the formula to judge the joint failure mode is set up and verified by the test results. The experimental study showed that the calculating width of the equivalent beam stipulated in the Code for Seismic Design of Building Structures is reasonable and on the safe side, while the seismic behavior of slab-column structures is not well, since the dissipating energy ability is low.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2005年第5期1-7,共7页
Journal of Building Structures
基金
广州市建委建设科技发展基金(200109)
关键词
板-柱结构
等代梁的计算宽度
节点破坏形态
slab-column structure
calculating width of equivalent beam
joint failure mode
