转体桥平转球铰转体过程应力计算方法研究

针对混凝土球铰平转过程受力复杂而实际多采用简化算法的现状,对该类桥转动过程应力计算方法进行研究。在弹性力学求解两球体边界受接触应力基础上,考虑球铰转动过程受牵引力、摩擦力共同作用,计算球铰所受复杂应力状态下主应力的大小,并根据屈服强度理论推导出该类桥梁所受正应力的强度条件。进而通过ANSYS建立球铰分析模型,模拟球铰实际受力状态,并结合球铰静止状态下建立的计算方法,对比分析基于强度理论计算方法的计算精度。通过具体工程算例分析表明:基于强度理论计算方法的误差为7.5%,计算精度高,从而丰富该类桥转体过程应力计算方法研究。

Research on the Stress Calculation of Ball Joint of Swivel Bridge during Rotation

Although the concrete joint ball is under complex stress during parallel rotation,simplified stress calculation method is actually employed. Due to the situation mentioned above,present researches aim to improve the stress calculation method of the bridge in rotation. Based on the theory of elastic mechanics to solve the contact stress in the boundary of two spheres,the present research calculates the stress of the joint ball under complex stress taking account of the joint ball under traction and friction simultaneously. The intensity condition of such bridge under normal stress is deduced according to the yield strength theory,and an analysis model of ball joint established by ANSYS is used to simulate the actual situation of the joint ball,combined with the calculation method of joint ball in stationary. The accuracy of the calculation method based on strength theory is compared and analyzed. The results show that the calculation based on strength theory is accurate with only 7. 5% deviation and intensifies the study on stress calculation method of such bridges during rotation.