砖砌体柱及外包角钢加固轴心受压尺寸影响试验研究
Experimental Research on Size Effects of Brick Masonry Columns Reinforced with and Without External Angle Steel Under Axial Compression
敬登虎 1胡松涛 1乔墩2
作者信息
- 1. 东南大学土木工程学院,南京 211189
- 2. 华中科技大学土木与水利工程学院,武汉 430074
- 折叠
摘要
为研究砖砌体柱及外包角钢加固砖砌体柱的尺寸影响,完成了 12 根不同尺寸方形截面未加固及加固砖砌体柱的轴心受压试验,分析了试件的破坏特征、荷载-位移曲线、横截面平均应力-位移曲线、轴心抗压强度和承载力、名义峰值应变等.研究结果表明:在保持试件高厚比为 3 的前提下,增大未加固砖砌体柱的截面尺寸对轴心抗压强度几乎没有影响,但名义峰值应变随截面面积增大呈先上升后下降的趋势;外包角钢加固能够大幅提高砖砌体柱的轴心抗压承载力和变形能力,但截面尺寸对加固效果存在影响;在高厚比相同、截面含钢率与体积配箍率基本一致的情况下,名义峰值应变随砖砌体柱截面面积增大呈下降趋势,外包角钢对小尺寸砖砌体柱试件加固效果更好.最后,提出了外包角钢加固砖砌体柱的轴心受压承载力计算方法.
Abstract
For investigating the size effects of brick masonry columns and reinforced brick masonry columns with angle steel,axial compression tests were conducted on 12 square cross-section unreinforced and rein-forced brick masonry columns with different sizes.The failure characteristics,load-displacement curves,curves of average stress of cross-section versus displacement,axial compressive strength and bearing capac-ity,nominal peak strain,and other characteristics of the specimens were analyzed.The results showed that,the cross-sectional area of the unreinforced brick masonry column had little effect on the axial com-pressive strength at height-thickness ratio of 3,but the nominal peak strain increased and then decreased with the increase of the cross-sectional area.The outer angle steel reinforcement could greatly improve the axial compressive load-bearing and deformation capacity of the brick masonry column,but the cross-sec-tional size had an impact on the reinforcement effect.The reinforcement effect of angle steel on small-sized specimens was better at the same height-thickness ratio,steel content of sections,and volume-reinforce-ment ratio.The nominal peak strain of the reinforced masonry columns decreased with the increase of cross-sectional area.Finally,the method of calculating the bearing capacity of brick masonry columns reinforced with angle steel was proposed.
关键词
尺寸影响/砖砌体柱/外包角钢加固/轴心受压Key words
size effect/brick masonry column/external angle steel reinforcement/axial compression引用本文复制引用
出版年
2024
NETL
NSTL
万方数据