Assembly type soft steel damper optimized through equal-stress line

Abstract

The invention relates to a damper with vibration energy dissipated through a soft steel surface internal yield deformation mechanism. The damper is used for energy dissipation and vibration reduction of a house building. An assembly type soft steel damper optimized through an equal-stress line comprises a soft steel energy dissipation piece, an anti-buckling clamping plate, L-shaped connecting plates, anchoring steel plates, a polyfluortetraethylene plate, pre-pressing fastening bolts, friction type high-strength connecting bolts, a limiting bolt, embedded anchoring steel bars and flexible filling materials. The assembly type soft steel damper optimized through the equal-stress line can serve as a dividing element of a building to be installed in a structure and does not bear a vertical load; when the assembly type soft steel damper bears a wind load or an earthquake load, the elastic-plastic hysteretic behavior generated when the soft steel energy dissipation piece deforms dissipates the energy input by the wind load or the earthquake load, and thus main components of the structure are protected; the soft steel energy dissipation piece is optimized through the equal-stress line, so that accumulated plastic deformation of the energy dissipation piece is greatly reduced, and the low cycle fatigue performance of the energy dissipation piece is enhanced.

Description

(1) Technical field [0001] The invention belongs to the field of anti-seismic technology of structural engineering, and relates to a damper which utilizes the in-plane yield deformation mechanism of mild steel to dissipate vibration energy. (2) Background technology [0002] In recent years, violent earthquakes have caused major damage to engineering structures, and even caused serious casualties. A series of earthquake damage in Wenchuan, Yushu, Lushan, and Ludian shows that my country's urban buildings are still facing serious earthquake threats. With the release of the new version of the earthquake zoning map, the area of ​​fortified areas with degrees 7 and above in my country has increased to 58% of the national area, and 82% of provincial capitals and 57% of prefecture-level cities are in fortified areas with degrees 7 and above. How to efficiently and economically enhance the earthquake resistance of building structures is one of the important topics in current earthq...

AI Technical Summary

Problems solved by technology

Conventional metal mild steel dampers use in-plane deformation to dissipate energy, mainly shear deformation, with high rigidity and strong energy dissipation capacity

However, the energy dissipation plate is prone to out-of-plane buckling, which is difficult to control; the connection form of the energy dissipation section steel plate is mostly welding, which affects the low cycle fatigue performance of the damper on the one hand, and on the other hand, it is difficult to quickly replace it after the earthquake

In particular, the existing mild steel damper first enters yield under the control of normal stress at the four corners of the energy dissipation plate, and the cumulative plastic deformation is very large. The test shows that this is the stress point where the low cycle fatigue fracture of this type of damper first occurs

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