A speed-locked self-resetting anti-buckling brace

A technology of anti-buckling support and velocity locking, which is applied in the field of bridge seismic design, and can solve problems such as temperature sub-internal force concrete shrinkage and creep constraints

Active Publication Date: 2021-03-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the ordinary self-resetting energy-dissipating components in the above-mentioned prior art will restrain the temperature sub-internal force and concrete shrinkage and creep when the continuous beam bridge is arranged, and at the same time give full play to its self-resetting and energy-dissipating components. function, thereby providing a speed-locked self-resetting anti-buckling support

Method used

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  • A speed-locked self-resetting anti-buckling brace
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  • A speed-locked self-resetting anti-buckling brace

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specific Embodiment approach 1

[0045] refer to Figure 14 Specifically explain this embodiment, the speed-locking type self-resetting anti-buckling support described in this embodiment, its specific design, composition and working mode include the following steps:

[0046] Step 1: Complete the composition and combination of the three parts of the speed locking (LU) system, self-resetting (SC) system and buckling-resistant bracing (BRB) system;

[0047] Step 2: Explain the working principle of the device in static state, normal use state and earthquake vibration;

[0048] Step 3: According to the working principle of each part of the system, select the material and design the size;

[0049] Step 4: Using the viscous damper as a prototype to derive the restoring force model of the speed locking device, analyze the restoring force models of the self-resetting system and the anti-buckling system, and explain the combined working model of the three-part system, and the calculation method of the residual deforma...

specific Embodiment approach 2

[0058] This embodiment is a further description of the speed-locked self-resetting anti-buckling support described in the first specific embodiment. The principle is:

[0059] Step 21: The overall structure reaches static equilibrium in static mode;

[0060] Step 2 and 2: In the normal working mode, that is, in the deformation caused by temperature rise and temperature drop, the pier beam produces relative displacement. Since the supporting piston rod arranged at the movable pier can freely enter and exit in the cylinder, the deformation is released and self-resetting and energy-consuming devices are not activated;

[0061] Step 2 and 3: Under the action of the earthquake, the speed locking device quickly switches to the "locked" state, a damping force is generated in the damping hole, the rigidity of the cylinder barrel increases rapidly, and the cylinder barrel drives the casing in the self-resetting system, and the baffle inside the casing The disk spring is driven to mov...

specific Embodiment approach 3

[0063] This embodiment is to carry out the selection of material and the design of size for the working principle of each part system of the device described in the second embodiment. In this embodiment, the selection of materials and the design of the size in Step 3 are as follows: , and different types of bridges have different requirements for device materials under different seismic environments)

[0064] Step 31: Design of speed lock device:

[0065] According to a large number of quasi-static test results, the viscosity attenuation coefficient m of methyl silicone oil will change with the shear velocity μ, and the relationship between the two is shown in formula (1):

[0066]

[0067] This is also the basis for the calculation of the damping force due to viscous friction.

[0068] This specific implementation plans to adopt a density of 930kg / m 3 , a viscous medium of methyl silicone oil with a kinematic viscosity of 20000cSt.

[0069] The speed locking device ado...

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Abstract

The invention provides a speed locking type self-resetting buckling-restrained brace, and belongs to the technical field of anti-seismic design of bridges. The right side of a piston rod of an LU system extends into a cavity of an inner sleeve of an SC system, and the left side of a cylinder barrel in the LU system is welded to a pressure bearing pipe and the inner sleeve of the SC system, and then the combined LU and SC systems are inserted into a sleeve in a BRB system. The left end of a cylinder barrel in the LU system is connected with the left ends of a sleeve and an energy consumption inner core in the BRB system, the right end of the SC system is connected with the right end of a sleeve in the BRB system, the left ends of the combined whole system, an outer sleeve of the BRB systemand the piston rod in the LU system are connected with a bridge structure, and the inner sleeve of the SC system at the right side and the energy consumption inner core of the BRB system are connectedwith the bridge structure. According to the present invention, the speed locking device can improve the damping rate; because of the additional supports, the maximum displacement and the residual displacement of a pier top can be effectively reduced, the maximum displacement is controlled to meet the standard requirement, a reset function is effectively achieved, it is guaranteed that the reset rate is larger than 85%, and the safety of a bridge main body structure can be guaranteed.

Description

technical field [0001] The invention relates to a speed-locked self-resetting anti-buckling support, which belongs to the technical field of bridge anti-seismic design. Background technique [0002] Earthquake is one of the major natural disasters that mankind has faced for a long time. Earthquakes can burst out huge energy in an instant and cause damage. The bridge structure is a vital part of the transportation network, and its structure plays a decisive role in the resistance to earthquake disasters. Therefore, how to make the bridge structure have better anti-seismic function, and it is easier to restore the normal service state after the earthquake, has always been a serious issue for those who are engaged in the anti-seismic research of bridge results. With the development of society, people began to carry out the anti-seismic design of "using softness to overcome rigidity", using the ductility of the structure to deform the structure to dissipate the energy generated...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D19/00
CPCE01D19/00
Inventor 刘立鹏张杨怡黎子荣李佳奇刘羽
Owner HARBIN INST OF TECH
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