钢筋混凝土柱塑性铰长度尺寸效应研究

为了研究钢筋混凝土柱塑性铰长度的尺寸效应,依据12根不同截面尺寸的钢筋混凝土柱单调和低周反复加载试验结果,分别采用纵筋屈服法、"纵筋应变-截面曲率"法、"百分表-截面曲率"法、等效塑性铰长度4种方法确定了试件的塑性铰长度,研究了截面尺寸对塑性铰长度的影响.结果表明:4种确定塑性铰长度的方法有一定的差别,等效塑性铰长度所得结果最小,"百分表-截面曲率"法所得结果最大;塑性铰长度随截面尺寸的增大相对减小,呈现出一定的尺寸效应,在此基础上,提出了塑性铰长度的截面尺寸影响系数.

Size Effect on Plastic Hinge Length of Reinforced Concrete Columns

This paper was based on the text results of 12 different section size columns under monotonic loading and low reversed cyclic loading. In order to study the effect of section size on plastic hinge length,four methods were used to determine the plastic hinge length of the specimens: longitudinal rebar yield,"longitudinal rebar strain-section curvature","dial gage-section curvature",equivalent plastic hinge length. The analysis results show that the four methods used to determine the plastic hinge length have certain differences. Result of equivalent plastic hinge length is the minimum; result of method"dial gage-section curvature"is the maximum. Plastic hinge length relatively decreases with increasing of cross section size. Then,on the basis of experiment,the section size effect coefficient of plastic hinge length was proposed.