摘要
格构式型钢混凝土柱具有良好的力学性能,然而由于尚未有其正截面承载力计算公式而限制了它的应用。本文引入等效约束系数来考虑偏压荷载作用下截面应变梯度对钢构架约束效应的影响,采用考虑应变梯度影响的钢构架约束混凝土本构模型,将受压区混凝土应力图和角钢应力图等效为矩形应力图,计算约束区混凝土及钢构架的合力系数及合力矩系数;基于叠加理论和极限平衡理论,建立了格构式型钢混凝土偏心受压柱正截面承载力计算公式。采用格构式型钢混凝土偏心受压柱的试验数据对本文提出的正截面承载力计算公式进行了验证,公式计算结果与试验结果比值的平均值和变异系数分别为0.962、0.054,表明本文公式能够准确地计算格构式型钢混凝土偏心受压柱正截面承载力。
Lattice steel reinforced concrete columns have good mechanical properties,however,their application is limited by the fact that there is not yet a formula for calculating its normal section bearing capacity.In this paper,the is introduced to consider the influence of cross-section strain gradient on the constraint effect of steel frame under eccentric compression.A constitutive model of steel frame confined concrete considering the influence of strain gradient is adopted.The stress diagram of concrete in the compression zone and the stress diagram of angle steel are equated to the rectangular stress diagram,and the combined force coefficient and the combined moment coefficient of the confined concrete and steel frame are calculated.Based on superposition theory and limit equilibrium theory,a calculation formula for normal section bearing capacity of lattice steel reinforced concrete eccentric compression columns is established.The test data of lattice steel reinforced concrete eccentric compression columns are used to verify the proposed formula.The average value and coefficient of variation of the ratio of the formula calculation results to the test results are 0.962 and 0.054,respectively,indicating that the formula in this paper can accurately calculate the normal section bearing capacity of lattice steel reinforced concrete eccentric compression columns.
作者
杨顺
田水
谷倩
刘玖赢
YANG Shun;TIAN Shui;GU Qian;LIU Jiuying(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China)
出处
《建筑钢结构进展》
北大核心
2025年第8期74-80,共7页
Progress in Steel Building Structures
关键词
偏心受压
格构式型钢混凝土柱
叠加理论
极限平衡理论
约束混凝土
等效约束系数
计算公式
eccentric compression
lattice steel reinforced concrete column
superposition theory
limit equilibrium theory
confined concrete
equivalent constraint coefficient
calculation formula
