论文部分内容阅读
为了优化剪力键结构,改善剪力键受力,采用三维数值模拟软件对沉管节段接头剪力键的受力特性进行了分析,并将结果与大比例尺模型试验剪力键受力特征及破坏状态进行比较,得出了剪力键端角处局部压应力较大,剪力键与衬砌衔接处局部拉应力较大的受力特点。针对上述受力特点,提出了在剪力键与节段衔接处增设受拉钢筋,对剪力键的结构形式进行了3种改变的建议,并将改变后的剪力键与工程原型进行局部三维数值模拟对比研究。研究结果表明:相比工程原型,增大剪力键端头倾角有利于剪力键受力,但效果并不显著;端角处采用圆角设计,能够明显改善剪力键受力,其端角处的局部应力较工程原型降低了27.2%;在端角处采用倒角设计,剪力键局部应力集中最显著,不利于剪力键受力,应避免采用。
In order to optimize the structure of the shear bond and improve the force of the shear bond, the force characteristics of the shear bond of the immersed segment joint were analyzed by three-dimensional numerical simulation software. The results were compared with those of the large-scale model test And the failure state were compared, and the stress characteristics of large local compressive stress at the corner of shear bond and local tensile stress at the junction of shear bond and lining were obtained. According to the characteristics of the above mentioned forces, this paper puts forward the proposal of adding tensioning bars at the interface of shear key and segment, and making three kinds of changes to the structure form of shear bond. The modified shear bond and engineering prototype are locally Comparison of Three Dimensional Numerical Simulation. The results show that: compared with the engineering prototype, increasing the tip angle of the shear key is beneficial to the shear force, but the effect is not significant; the fillet design at the corner can obviously improve the shear force, The local stress at the corner is 27.2% lower than that of the engineering prototype. The chamfer design at the corner is the most significant stress concentration in the shear bond, which is not conducive to the shear force. It should be avoided.