Study on calculating model of bond stress between reinforcing bar and concrete 钢筋与混凝土粘结应力计算模式的研究
In order to study the slip between rebar and concrete, the fundamental equations are analyzed and the2nd order differential equation of the relation between bond stress and local slip are obtained. 为了求解钢筋与混凝土间滑移量,对黏结滑移基本方程进行了分析,导出了黏结应力-局部滑移相互关系的二阶微分方程。
Under continued loading the sliding surface is smoothed due to wear and compaction, which will result in a further decrease of the bond stress, similar to the case of plain bars. 在连续载荷下,因为磨损和压紧,该滑动面是光滑的,将导致粘结应力的进一步下降,类似于无节钢筋的情况。
Steel strain and relative slip increase exponentially from the free end to the loading end before bond stress reaches the local bond strength; 结果表明:在界面粘结应力尚未达到局部粘结强度之前,型钢应变和界面滑移近似呈指数变化;
The distribution model of bond stress over the splice length is developed. 建立了粘结应力沿锚固长度的分布模式。
The whole bond slip curve and bond stress distribution along embedded length were measured by continuous automatic collection. 采用了连续自动的采集方式,测出了较完整的粘结滑移曲线以及粘结应力沿埋长的分布。
By separating the local bond stresses from the total bond shear stresses, the anchorage bond stresses along the extensional bond length are obtained, and the bond stress distribution is investigated. 通过分离总粘结应力中的局部粘结应力,得到粘结延伸长度范围内的锚固粘结应力分布,并结合试验数据对其分布规律进行了研究。
Bond stress in the state of bond-slip should be adopted in the foundation design. 当设计人员在设计基础时,只能够采用在滑动摩阻状态下的粘着应力值。
The distributions of strain and bond stress in the grout are attenuated in the minus exponential rule. 锚固段注浆体内的应变与粘结应力分布按照负指数规律衰减。
Then the relationship of the reinforcement steel corrosion and the bond stress between the concrete and the reinforcement steel is also analysed. 分析了钢筋与混凝土间粘接力与钢筋锈蚀程度的关系。
With the distributions of bond stress and local slip, all specimens 'bond-slip curves were simulated. And the calculating formula of characteristic slip and bond strength was conducted by mathematically disposal and statistically regression of bond-slip curves; 结合粘结应力和局部滑移的分布规律,拟合出了各试件的粘结滑移曲线,然后对曲线进行一定的数学处理,经过统计回归后得到了特征滑移值和特征粘结强度的计算公式;
The relation of displacement ductility factor μ?, axial load ratio n, shear-compression ratio v and average bond stress of the reinforcements are quantified on the basis of early research. 并在以往研究的基础上拟合出矩形截面柱中间层中节点梁筋贯穿段平均粘结应力与组合体位移延性系数μΔ、轴压比n和剪压比v的定量关系;
The relationship between bond stress and slip displacement of corroded reinforcement with concrete under cyclic loading has been experimentally investigated. 试验研究了混凝土中腐蚀钢筋在反复荷载作用下的粘结-滑移特性。
Based on the double-face shear bond test results, the distributions of shear bond stress and local bond stress-slip relationship at the bond interface between GFRP and masonry have been studied, and a local bond stress-slip relationship model has been proposed. 根据双面剪切粘结试验的结果,研究了砖砌体与GFRP粘结界面上剪切粘结应力的分布以及局部粘结应力滑移关系,提出了局部粘结应力滑移关系的理论模型;
The bond of rebar and concrete under different temperatures and different ways of cooling and loading was studied. The bond-slip curve, the ultimate bond stress, and the ultimate slip of reinforced concrete under different conditions were analyzed. 对在不同受热温度、冷却方式和加载制度下钢筋混凝土黏结性能进行试验研究,分析了不同条件下钢筋混凝土的黏结-滑移曲线和极限黏结应力、极限滑移。
This paper also gave the relationship of bond stress and slip of corroded bars and concrete varying with time and position, which could reflect the bond behavior of steel bar and concrete comprehensively. 最后,本文给出了随时间和位置变化的钢筋与混凝土的粘结本构关系,可较全面地反映钢筋与混凝土的粘结性能。
Based on the four-point bending test results of brick masonry specimens strengthened with GFRP, the strain distributions in GFRP and the shear bond stress distributions at the bond interface under different loads have been studied. 根据GFRP加固的砖砌体试件受弯试验结果,研究了不同荷载下GFRP的应变分布以及粘结界面剪切粘结应力的分布;
Key parameters measured are bond stress and slip between structural steel and concrete. 测量的关键参数是型钢与混凝土之间的粘结应力和滑移。
It offers the theoretic base for the lightweight concrete bond mechanics and the construction of bond stress model. 为轻骨料混凝土粘结机理研究及建立粘结本构关系提供了必要的基础。
Based on the result of dynamic tensile test, the rule of distribution of bond stress along the anchorage length with time was discussed. 根据18个试件动态拉伸试验结果,得出了粘结应力沿锚固深度分布的时程变化规律;
According to experimental data, the ultimate bond stress and bonding-slipping constitutive relation are presented based on the thickness of protection layer and effective bond length. 根据试验数据回归出基于相对保护层厚度和相对有效粘结长度的极限粘结应力计算公式和粘结应力与滑移的本构关系式。
Time history curve and space curve of the dynamical strain and bond stress of insert rebar with different anchorage length and loading conditions were gained. 给出了爆炸荷载作用下锚筋动应变及动粘结应力的时程分布曲线和空间分布曲线,研究了锚长、加载速率和加载方式等各种因素的影响。
To study the bond capability between round steel bars and reactive powder concrete, the bond stress and slippage are measured with steel bars of different diameters and anchorage lengths. 为了研究光圆钢筋与活性粉末混凝土的粘结性能,本文改变钢筋直径与锚固长度测定了粘结应力和滑移量。
The relation between the bond stress along the anchor rod and the displacement of the anchor rod are summed up as four models, on three models of which, the bond stress distribution, the load-displacement relation and the ultimate pull-out resistance are discussed theoretically. 本文总结了锚杆握裹力与位移关系的四种模型,对其中三种模型的握裹力分布、荷载位移关系和极限抗拨力等问题从理论上进行了分析。
The results of the comparisons show that the expression of the longitudinal bond stress is effective and applicable. 结果表明,本文提出的剪应力计算公式是有效和适用的。
The stress? strain relationship of the corroded steel bar and the bond stress? slip between the concrete and the corroded steel bar are established. 通过锈蚀钢筋力学性能及其与混凝土的粘结性能的试验研究,建立了锈蚀钢筋的应力-应变关系和锈蚀钢筋与混凝土的粘结应力-滑移关系的退化模型。
Bond Stress and Local Slip of Reinforced Concrete 钢筋混凝土粘结应力和局部滑移相互关系的分方程及悬臂虚梁法的研究
Some practical formulas of nonlinear analysis are obtained for calculating the bond stress, the slip and the stress of steel bar. 得出了计算粘结应力、滑移及钢筋应力的非线性实用公式。
Through tensile experiments of double-sided bonding specimens and single-sided bonding specimens, we study the bond failure mechanism of CFRP plate and the steel sheet and distribution of bond stress. 2 、 Research and development of new type CFRP anchorage. 通过碳纤维板与钢板双面粘结和单面粘结试件的拉伸试验,研究碳纤维板与钢板的粘结破坏机理和粘结剪应力的分布规律。2、碳纤维板锚具的研究开发。
Based on the bond stress and strain received by the numerical simulation, bond mechanism is studied deeply. The distribution and the development of the stress and strain in the process of debonding are studied. 4. 根据数值模拟得到的界面局部粘结应力和应变,深入分析了其粘结机理,研究了剥离过程中的应力、应变分布和发展情况。