Analysis and discussion of the response to the working condition 1 knows that with the increase of the spring coefficient of the support, the prestress value of the lower string of the string string increases, the mid-span deflection and the section bending moment decrease, and the axial force of the section at the support increases. And it is seen that with the increase of the prestress value of the lower string of the string string, the reduction of the mid-span bending moment is greater than the increase of the axial pressure, so that the normal stress of the mid-section which is unfavorable is also decreased; Although the normal stress of the cross section of the seat increases, the small value has little effect on the mechanical behavior of the structure, that is, the cross section of the support 1 is not the control cross section.
It is shown that the values ​​of working condition 2 are smaller than the working condition 4, indicating that the influence of the mid-span spring k3 on the bearing performance is greater than the combined effect of the two springs k2 and k4 on the straddle, which indicates the ability of the spanning strut to resist deflection. It is better; analysis and working condition 2 mid-span bending moment are less than the corresponding value of working condition 4, and the axial force at working condition 2 is greater than the corresponding value of working condition 4, and the main control internal force of each cross-section is seen from the result. It is a bending moment, so the working condition 2 is better than the working condition from the internal force reaction angle. 4. By comparing the working condition 2 and the working condition 3, it is beneficial to improve the level of the deflection of the mid-strut strut to improve the overall mechanical performance.
It is seen that the deformation increase of working condition 2 and working condition 4 is close, so the deformation stiffness of these two working conditions is close.
Compare the reaction of working condition 2 with working condition 4. It can be seen that the working condition 2 is better than the working condition 4 regardless of the mid-span deflection or the bearing displacement. It is also seen that the internal force response of the working condition 3 is better than the working condition 2, so the coordination of the three struts is improved. The ability to resist deflection helps to obtain a better structure.
It is analyzed and seen that with the increase of the spring coefficient of the support, the structural deflection decreases slowly, that is, as the prestress of the lower string increases, the structural stiffness increases slowly; the comparison conditions 2, 3, 4 react, vertical 3 The effect of joint improvement of spring stiffness is obviously better than that of strut stiffness respectively. This shows that although the flexural capacity of strut is mainly improved by spanning strut, the effect of auxiliary reinforcement on both sides is better.
According to the analysis of the 2 and 3 working conditions, the central vertical spring has a significant influence on the internal force than the displacement, but the effect of the three struts is better.
Conclusion In this paper, the effect of the strut and the down-string of the stringed beam on the upper beam is simulated as a spring, and the calculation model of the spring of the stringed beam is established. The influence of the change of the stiffness of each spring on the structural deformation and internal force is discussed. The analysis shows that from the perspective of deformation and internal force reaction, the effect of the spanning strut is greater than that of the side strut, but it is better to coordinate the improvement of the flexural capacity of each strut to obtain a better structure; the prestress of the pull-down string is beneficial to the structural stress.
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