Shock insulation layer prestress tensile device

Abstract

The invention provides a shock insulation layer prestress tensile device. The device comprises inhaul cables and a steel box girder, one end of each inhaul cable is connected with a top beam of a shock insulation layer through a connecting beam, and the other end of each inhaul cable penetrates through a bottom beam of the shock insulation layer and is connected with the steel box girder; a devicefor reducing friction force is arranged on the contact surface of the bottom beam of the shock insulation layer and the steel box girder. The tensile device has the advantages that the additional tensile rigidity is small, the total tension of the position of a support can be effectively optimized, the tension level of an upper structure and a lower structure connected with the support is reduced, the construction cost is reduced, quantitative analysis of the tensile device can be achieved, a basis is provided for the design of the tensile device, and a tensile device prestress design methodis deduced.

Description

Technical field [0001] The invention relates to the field of bridges, and more specifically to a prestressed tensile device for a seismic isolation layer. Background technique [0002] my country is a country with frequent earthquakes. In recent years, there have been major earthquakes in Wenchuan and Ya'an. The earthquakes have caused a large number of casualties and huge property losses. Even though some buildings have reached the design goal of earthquake-resistant design, The destruction of the infill wall and the decoration secondary structure caused casualties. Therefore, it has been repeatedly mentioned at the government level that it is recommended to promote seismic isolation technology to improve the seismic performance of the structure to ensure the safety of personnel. In some areas with high design intensity, the use of seismic isolation technology for important buildings has greatly promoted my country's seismic isolation. Technology development. [0003] Since common...

AI Technical Summary

Problems solved by technology

[0005] The survey found that the existing tensile devices are not suitable for the requirements of higher tensile levels

For example, the tensile device type 1 proposed by some scholars (see image 3 ), image 3 Middle 2 is the seismic isolation support, 13 is the tie rod, 14 is the cross bar, and 15 is the special beam for seismic isolation. This device will add a larger tensile stiffness, and the additional stiffness will be significantly greater than the tensile stiffness of the rubber bearing. It is basically equivalent to the compressive stiffness. For high-intensity areas with large overturning moments, excessive additional stiffness will significantly increase the tensile force. When the load is insufficient, the section of the steel member will be increased, and the final convergence will be very difficult.

Images