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在拟静力试验基础上,根据挡块的破坏现象、钢筋的应变分布规律、以及挡块的力-变形关系曲线识别了挡块的两种典型破坏形态,即斜截面剪切破坏和连接面剪切破坏。引入转动刚体的假设模拟挡块的破坏机制,提出混凝土和钢筋强度贡献的两个独立分项,分别建立了两种破坏形态下挡块的抗震强度预测模型。两个模型本质上一致,但受力模式有别。斜截面转动刚体模型中挡块的强度主要来自混凝土、剪切钢筋、水平拉筋和水平构造筋的贡献;而连接面转动刚体模型主要来自混凝土和剪切钢筋。两个模型不仅可体现挡块尺寸、材料特性、钢筋数量等基本参数的影响,也可反映加载位置、钢筋位置等因素的作用。误差分析表明两个模型计算结果精确、可靠,可为挡块的抗震设计计算提供参考。
Based on the quasi-static test, two typical failure modes of the stopper are identified according to the failure phenomenon of the stopper, the strain distribution of the reinforcement and the force-deformation curve of the stopper, that is, the shear failure of the oblique section and the connection surface Shear damage. By introducing the failure mechanism of the assumed simulation block with rotating rigid body, two independent subsections of the contribution of concrete and reinforcement strength are proposed, and the prediction models of the earthquake resistance strength of the two blocks under the failure mode are respectively established. The two models are essentially the same, but the stress modes are different. The strength of the block in the rigid body model with inclined section mainly comes from the contribution of concrete, shear reinforcement, horizontal reinforcement and horizontal reinforcement, while the rotating rigid body model of the connection surface mainly comes from concrete and shear reinforcement. The two models can not only reflect the basic parameters of the block size, material properties, the number of steel bars, but also reflect the role of loading location, steel location and other factors. Error analysis shows that the results of the two models are accurate and reliable, which can provide reference for the design of anti-seismic design of stop block.