钢筋网高延性混凝土加固砖柱偏心受压性能试验及计算方法研究  

EXPERIMENT AND CALCULATION METHOD FOR ECCENTRICALLY LOADED MASONRY COLUMNS STRENGTHENED WITH BAR MESH HDC

作　　者：邓明科[1] 李彤 范丽玮 DENG Ming-ke;LI Tong;FAN Li-wei(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an,Shaanxi 710055,China;Tianjin Tianhua North Architectural Design Co.Ltd.,Tianjin 300000,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]天津天华北方建筑设计有限公司,天津300000

出　　处：《工程力学》2021年第5期61-71,共11页Engineering Mechanics

基　　金：国家自然科学基金项目(51878545);军队后勤科研计划项目(CKJ16J055);西安市重大科技创新计划项目(20191522415KYPT015JC017)。

摘　　要：通过27个钢筋网高延性混凝土(HDC)面层加固砖柱的偏心受压试验,研究了不同偏心距荷载作用下加固砖柱的破坏形态和受力性能,并对荷载-位移曲线、极限承载力以及砖柱截面应变进行了分析。结果表明:钢筋网HDC面层与砌体具有良好的协调工作能力,可大幅度提高砖柱的承载力和变形能力,改善了砖柱的脆性破坏特征,并且提高了砖柱的整体性;随偏心距增大,砖柱的承载力逐渐降低,但初始偏心距并未削弱钢筋网HDC面层的加固效果。考虑HDC的抗拉作用,并对加固层的应力进行计算简化,得到钢筋网HDC面层加固偏心受压砖柱的承载力计算公式,与试验结果吻合较好。分析了二次受力对砖柱承载力的影响,给出了不同初始偏心荷载作用下的HDC抗压强度利用系数,可供加固设计参考使用。Twenty seven brick masonry columns strengthened with bar mesh highly ductile fiber reinforced concrete(BMHDC)jackets were subjected to concentric and eccentric loads.The compressive behavior of the reinforced masonry columns was investigated,including the failure mode,load-displacement curves,peak load and sectional strain distribution.The results indicate that the BMHDC jackets greatly improved the strength and deformability and delayed the brittle failure of the masonry columns.Moreover,the BMHDC jackets and masonry substrates had a good synergy,which enhanced the overall performance of the masonry columns.Although the strength decreased with the increase in the initial eccentricity,the effectiveness of the reinforcement was not weakened by the eccentric load.Based on the tension effect of the HDC and a simplified stress distribution on the cross section,a formula was proposed for predicting the strength of eccentrically loaded masonry columns reinforced with BMHDC jackets.The prediction conformed well with the experimental results.The influence of a repeated loading on the strength of the strengthened masonry columns was analyzed.The compressive strength reduction factor of the HDC was proposed under different initial eccentric loads,which can be applied in the design of strengthening.

关 键 词：砖柱 高延性混凝土 加固 偏心荷载 变形能力 承载力 

分 类 号：TU364[建筑科学—结构工程]