Sliding material friction performance evaluating method for bridge and building shock isolation devices

Abstract

The invention belongs to the technical field of shock isolation in structural engineering, and discloses a sliding material friction performance evaluating method for bridge and building shock isolation devices. The method comprises the following steps: S1, getting the initial parameters of an evaluated material; S2, detecting the vertical pressure performance of the evaluated material; S3, detecting the maximum horizontal friction under a non-seismic condition; S4, carrying out friction characteristic test; and S5, carrying out long-range friction test. Vertical pressure test is added before friction test, and whether the pressure capacity of the evaluated material meets the design requirement is judged first, so that the evaluation period is shortened effectively, and the detection efficiency is improved. The influence of pressure capacity, movement rate and temperature on the friction coefficient is considered, and the stability of the long-range friction coefficient is monitored. Based on the detection results, the friction performance of the evaluated material can be evaluated more comprehensively. A scientific and reliable way of evaluation is provided for the development and type selection of sliding materials for bridge and building shock isolation devices.

Description

technical field [0001] The invention belongs to the technical field of shock absorption and isolation in structural engineering, and more specifically relates to a method for evaluating the friction performance of sliding materials. Background technique [0002] With the continuous improvement of the research level of seismic isolation technology in structural engineering in my country, the application of seismic isolation devices in building construction and bridge engineering is also increasing. [0003] Most seismic isolation devices use frictional sliding to convert earthquake or other vibration energy into heat energy and dissipate it. Among them, the sliding material is the core component of the frictional slip of the shock-isolation device, and its friction performance directly determines the shock-absorbing effect of the shock-isolation device. At present, the only few sliding materials in China are based on the technology selection of European and American countrie...

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Problems solved by technology

[0007] 1) It cannot reflect the friction coefficient of the sliding material in high-speed motion, and this index is an important reference basis for the design of the equivalent damping ratio of the isolation device;

[0008] 2) The influence of the self-deformation of the sliding material on the thickness change of the evaluated sample is not considered, and there is often a big difference between the thickness change calculated by the quality and the actual thickness measurement value;

[0009] 3) The influence of temperature and sliding velocity on the friction properties of sliding materials is not considered, and the dependence of the friction properties of different materials on temperature and sliding velocity varies greatly

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