:依 据桁 架一拱 模 型理论 分析 了钢 筋 混 凝 土 梁的 受 剪机 理 并 给 出 了受剪 承 载 力公 式 ,该公 式
考虑 了混凝 土 的软化 效应 、拱体 作 用等 因素 对钢 筋混 凝土 梁的 受剪 承 载 力影 响 ,并 结合试 验 数 据对
公 式 中系数 进行 了修 正 。 当结构材 料 与 原 建 立规 范计 算公 式 时的材 料 性 能差 异 较 大 时 ,规 范公 式
不再适 用 。而 经计算 ,采 用桁 架一拱 理论 公 式的计 算结 果与 试验 结果 比值 的均值 更接 近 于 1,标 准偏
差和 变异 系数 均较规 范公 式计 算 结果 小 ,与 试验 结果 吻合 较好 。采 用 美 国规 范 ACI 318一O8中构件
受剪承 栽 力公 式对所 收 集试验数 据 进行 计 算 ,计 算结 果表 明 ,美 国规 范较 中国规 范保 守。研 究 结果
表 明 :桁 架一拱理论 公 式 可以 用于钢 筋混 凝 土梁 的受剪承 载 力计 算 。
关键 词 :钢 筋混凝 土 梁 ;受剪承载 力 ;桁 架一拱模 型 ;混凝 土结 构设计 规 范
中图分 类号 :TU375.1 文献 标 志码 :A 文章 编号 :1674—4764(2013)04—0007—06
Shear Capacity Calculation Analysis of Reinforced Concrete Beams
Based on Truss-arch M odel
Shi Qingxuan, Wang Peng,Wang Qiuwei
(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,P.R.China)
Abstract:According to the theory of truss—arch model,the shear mechanism of reinforced concrete beam
was analyzed,and formula of shear bearing capacity was proposed. In this formula, softening effect of
concrete and the arch function were taken into account,and the coefficients in the formula were am ended
with experim ental data. W hen the performance difference between the structural m aterial and the original
material is huge, the code formula of shear bearing capacity calculation is inapplicable. After the
computation, the ratio of the results calculated by truss-arch m odel theory formula and the results
calculated by the current code form ula was close to 1,and the standard deviation coefficient and coefficient
of variation were smaller than those of standard form ula results,and the results calculated by truss-arch
model form ula were in good agreement with the experim ental results.The collected experim ental data was
calculated w ith the shear capacity form ula in ACI318—08, and the calculation results showed that U nited
States building code was more conservative than the standard of China. The results indicate that the shear
bearing capacity form ula based on truss—arch model can be used for computation of shear bearing capacity of
reinforced concrete beams.
Key words:reinforced concrete beam ;shear capacity;truss—arch model;code for design of concrete struc—
tt】res
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