摘要
针对石结构中石板楼盖整体性差及支撑长度不足等抗震薄弱环节,提出在石楼板底部周边沿承重石墙增设内圈梁的加固方法。制作了6个在条石侧面后浇混凝土内圈梁的试件单元,通过在内圈梁上施加偏心荷载,以研究植入U型锚固筋的用量、U型锚固筋表面特征和偏心距对内圈梁的破坏形态及抗剪承载力的影响。试验结果表明:(1)增加U型锚固筋的用量可以有效提高内圈梁的抗剪承载力;(2)采用带肋锚固筋的内圈梁的抗剪承载力比采用光圆锚固筋的内圈梁的抗剪承载力高;(3)内圈梁抗剪承载力随偏心距的减小而增大。在对试验结果和受力机理分析的基础上,提出了内圈梁抗剪承载力计算公式。研究结果可为石板楼盖加固提供参考。
Aiming at the seismic weakness in stone slabs of stone structures,such as poor integrity and insufficient supporting length,a new retrofitting technique of adding reinforced concrete(RC) inner ring beams to stone walls beneath the stone slabs was proposed.Six specimens with RC inner ring beams casted on the flank were fabricated and subjected to eccentric loadings to investigate the bond performance between stone and RC beams.The researched parameters include the amount and surface characteristic of U-shaped anchor bar and influence of the eccentricity on failure patterns and shear bearing capacity.Test results show that,(1) increasing the amount of the U-shaped anchor bars could effectively increase the shear bearing capacity of the specimens;(2) the specimens using ribbed anchor bars have higher shear capacity than the specimens using plain anchor bars;(3) the shear-bearing capacity of the specimens decreases with the increase of the eccentric distance.Based on the test results and mechanism analysis,a formula to calculate the shear-bearing capacity of the interface between stone and RC beams is proposed.This paper could serve as reference for the retrofit of stone slabs.
出处
《自然灾害学报》
CSCD
北大核心
2014年第3期243-249,共7页
Journal of Natural Disasters
基金
福建省科技重大项目(2011Y4008)
关键词
石结构
石板楼盖
内圈梁
整体性
抗剪承载力
stone structure
stone slabs
inner ring beam
integrality
shear bearing capacity
