加 固后混凝土梁的力学行为与加 固时的既有截面初始应 力状态密切相关,为 了解在
不 同的初 始 应力状 态下加 固混 凝土 梁的 力 学性 能 ,通过模 型 试验 ,对 3片结构参 数相 同的混凝 土试
验 梁 ,分 别在 不 同的初 始应 力状 态下采 用增 大截 面法加 固,并进行 正 常使 用极 限状 态与承 载 能力极
限 状 态下的加 栽试 验 ,对试 验 梁的承 载 力 、钢 筋与 混凝 土的 应 变及 裂缝 发展 过程 进行 分析 。结果表
明 :在 不 同的初始 应 力状 态下 ,加 固混凝 土 梁的正 常使 用极 限状 态的 承载 力存 在 明 显 差别 ;加 固后
混 凝 土梁 的 变形不 满足 平面假 定 ,其承 载 力计 算 必须 考虑 分阶段 受 力的影 响 ;初 始 应 力状 态对极 限
承 载 力影响 不 大 。
关 键词 :钢 筋 混凝 土 梁 ;加 固 ;力 学性 能 ;模 型试 验 ;初 始应 力状 态 ;卸载 率
中图分 类 号 :TU398 文 献标 志码 :A
Influence of Initial Stress State on M echanical
Behavior of Strengthened Concrete Beams
XING Bing 一,LI Xiao—zhen ,QIANG Shi—zhong
(1.School of Civil Engineering,Southwest Jiaotong University,Chengdu 6 1 003 1,
China:2. Sichuan H uateng Highway Testing Co.,Ltd.,Chengdu 611730,China)
Abstract:T‘he m echanical behavior of the strengthened concrete beams iS closely related to
the initia1 stress state of the sections of the beam s being strengthened. To understand the me—
chanica1 behavior of the strengthened concrete beams under the different initial stress state,the
m odel tests for the concrete beam s were made. 3 test beam s having the sam e structural param e—
ters were strengthened by the section enlarging m ethod respectively under the different initial
stress state,the beam s were loaded to the normal service limit state and to the bearing capacity
1im it state in the tests and the bearing capacity,strain of the reinforcem ent and concrete and the
crack development process of the beam s were analyzed.The results of the tests show that under
the different initial stress state, the bearing capacity of the normal service limit state of the
strengthened concrete beam s is significantly varied.The deform ation of the concrete beam s does
not m eet the plane~section assumption. In the calculation of the bearing capacity of the beams,
the influence of the forces in the beams in stages should be thoroughly considered. The influence
of the initial stress state on the bearing capacity lim it state is not great.
Key words:reinforced concrete beam ;strengthening;m echanical behavior;model test;ini—
tial stress state;unloading ratio
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