摘要
研究了低速冲击下钢筋混凝土梁的截面刚度,以及冲击体和结构间接触区域的柔度变化。将梁分成斜裂缝形成以前和斜裂缝形成以后两个阶段来研究。斜裂缝形成以前,梁被看成弹性均质体,接触区的柔度由受压和受拉条件下混凝土的柔度串联而成,根据柔度的定义推导得出该阶段接触区的刚度;斜裂缝形成以后接触区的刚度受高为xw弯—剪式固端梁构件、下部受拉钢筋、冲击体与下部钢筋之间的混凝土柱的制约,从而推导出该阶段的柔度。结合两个阶段接触区域的柔度公式,对低速下钢筋混凝土梁的接触刚度进行了举例计算和分析,表明斜裂缝形成以前的阶段可以忽略不计。
Sectional rigidity of reinforced concrete beam under low velocity impact and flexible stiffness of contact region between the impact body and structure were mainly studied. The beam was divided into two stages before and after the oblique crack. The beam was considered an elastic body, the deflection of the contact region was composed of deflections of the concrete in press and tension, and the rigidity of contact region in this stage was deduced according to the definition of the deflection. The rigidity of contact region was constrained with bending-shearing beam element of x,~, tension steel bar and the concrete column between the impact body and the inferior steel bar, and the deflection of this stage was deduced. With the formula for flexible stiffness of the two stages, the contacting stiffness of the beam under low velocity impact were computed and analyzed by way of example, and the conclusion was obtained that the stage before the oblique crack can be ignored.
出处
《解放军理工大学学报（自然科学版）》
EI
2008年第2期146-150,共5页
Journal of PLA University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(50578158)
关键词
钢筋混凝土梁
局部变形
低速冲击
刚度
reinforced concrete beam
local deformation
low velocity impact
rigidity
