Replaceable assembled type energy dissipating and vibration damping joint provided with self resetting function

A prefabricated, self-resetting technology, applied in protective buildings/shelters, building components, building structures, etc., can solve the problem of changing structural dynamic energy consumption plastic hinge areas, poor energy dissipation and vibration reduction capabilities, and replaceable functions Improve the ease of implementation and recovery, improve performance, and improve energy dissipation and shock absorption capabilities

Active Publication Date: 2018-03-30

BEIJING UNIV OF TECH

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AI-Extracted Technical Summary

Problems solved by technology

[0004] In order to solve the problems of poor energy dissipation and vibration reduction ability of traditional assembled nodes, no self-resetting function, poor replaceable function, which will significantly change the structural dynamic energy consumption plastic hinge area, etc., the present invention propo...

Abstract

The invention discloses a replaceable assembled type energy dissipating and vibration damping joint provided with the self resetting function. The replaceable assembled type energy dissipating and vibration damping joint comprises a joint energy dissipating and resetting function connecting plate, a self resetting spring, energy dissipating soft steel, high strength anchor bolts, an assembled typereserved hole duct, a pre-stressed bar and a joint core area. The joint energy dissipating and resetting function connecting plate is connected with the joint core area and other prefabricated assembled type members by using the assembled type reserved hole duct through the high strength anchor bolts and the pre-stressed bar in an assembled mode. The edge of a flange plate of the energy dissipating and resetting function connecting plate is provided with a plurality of pre-pressing self-resetting springs with the same tension and compression stiffness according to resetting need. The energy dissipating soft steel is in assembled connection with the joint energy dissipating and resetting function connecting plate. The replaceable assembled type energy dissipating and vibration damping joint can be used as an independent system to replace the advantages of plastic hinged areas of traditional assembled beams, columns and piles, self resetting can be achieved during structural micro vibrating (shaking), and the replaceable (restoring) function is achieved effectively when post-vibrating (post-shaking) damage is generated.

Application Domain

Protective buildings/sheltersShock proofing

Technology Topic

Pre stressingEngineering +5

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Examples

Experimental program(2)

Example Embodiment

[0027] Example 1:

[0028] Such as Figure 1 ~ Figure 4 Shown here is a replaceable assembly type energy dissipation and vibration reduction node with self-reset function of the present invention, which mainly includes energy dissipation and reset function connecting plate 1, self-reset spring 2, energy dissipation mild steel 3, high-strength anchor bolt 4. Prefabricated reserved holes 5, prestressed tendons 6, node core area 7. This node is used for fabricated beam components in building fabricated frame structures.

[0029] The connecting plate 1 for energy dissipation and reset function is long flange I-shaped steel. The flange plate and the web (box section) are connected by welding. The cross-sectional dimension is b400mm×h500mm. Q420 steel is used. The upper and lower flange plates of the flange plate are used. Set six reserved holes 5 connected to the prestressed tendons and anchor bolt holes connected to the four pairs of energy dissipating soft steel 3 respectively. Six prestressed holes are symmetrically arranged on the upper and lower flange plates of the energy dissipating and resetting function connecting plates by welding. The pressure self-returning spring 2 has a linear stiffness of 150,000 kN/m, and two pairs of energy dissipating mild steel 3 are set at the reserved anchor hole positions. The energy dissipating mild steel 3 is made of low-yield aluminum alloy with a yield stress of 160 MPa. The node core area 7 is made of C50 prefabricated ordinary reinforced concrete, and six prestressed reserved holes 5 are reserved. Use pre-stressed tendons 6 to connect the energy dissipation and reset function connecting plate 1 with the node core area 7 by post-tensioning construction. The pre-stressed tendons 6 are 1×7Φ s The 12.7 prestressed steel strand has a yield stress of 1670MPa and a tensile control stress of 1250MPa. The connection between this node and the column members of the frame structure is a traditional connection method, without resetting and energy dissipation devices.

[0030] The dimension l of the energy dissipation and reset function connecting plate 1 along the length of the precast beam connected to it is determined according to the following formula.

[0031] l=κ×h

[0032] among them

[0033] h-the cross-sectional height of the connecting plate 1 for the energy dissipation and reset function

[0034] κ—— is the length coefficient of the plastic hinge of the beam member, the value range is 1.0~1.5

Example Embodiment

[0035] Example 2:

[0036] Such as Figure 1 ~ Figure 4 Shown is a replaceable assembled energy dissipation and vibration reduction node with self-reset function of the present invention, which mainly includes energy dissipation and reset function connecting plate 1, self-reset spring 2, energy dissipation mild steel 3, high-strength anchor bolt 4. Prefabricated reserved holes 5. Prestressed tendons 6. This node is used for the end of fabricated bridge pier column member.

[0037] This node does not have a core area 7 and is used as the plastic hinge area at the end of the fabricated bridge pier column. The energy dissipation and reset function connecting plate 1 is made of long-flange I-shaped steel, which is forged. Its cross-sectional size is b600mm×h600mm. It is made of Qd420 steel. The upper and lower flange plates of the flange plate are respectively provided with twelve connecting prestressed ribs. The reserved channel 5 and the anchor bolt holes connected with eight pairs of energy dissipating mild steel 3, four pre-compressed self-returning springs 2 are arranged symmetrically by welding at the four corners of the energy dissipating and resetting function connecting plate, the linear stiffness of which is 750,000kN/m , And set two pairs of energy dissipating soft steel 3 at the position of the reserved anchor bolt hole. The energy dissipating soft steel 3 uses a low-yield lead alloy with a yield stress of 160MPa. Twelve pre-stressed channels 5 are reserved. The pre-stressed steel bars 6 are set before the pile cap or precast pier column concrete is poured. After the assembly and positioning are completed, the post-tensioning method will be used to dissipate and reset the functional connecting plate 1 cap or precast pier. Column members are connected, the prestressed tendon 6 is 1×7Φ s 15.2 The prestressed steel strand has a yield stress of 1860MPa and a tensile control stress of 1390MPa.

[0038] Energy dissipation and reset function connecting plate 1 along the length of the prefabricated pier column p Take the smaller value of the calculation results of the following two formulas.

[0039] l p =0.08L 1 +0.022f y d s ≥0.044f y d s

[0040]

[0041] among them

[0042] L 1 ——The height of the cantilever pier or the distance from the plastic hinge section to the inflection point

[0043] d s ——The diameter of the longitudinal reinforcement of the pier column

[0044] f y ——Standard value of tensile strength of longitudinal reinforcement of pier column

[0045] b-the short side size of the rectangular section or the diameter of the center section

PUM

Property	Measurement	Unit
Stiffness	150000.0	kN/m
Yield stress	160.0	mPa

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

improve performance

Replaceable assembled type energy dissipating and vibration damping joint provided with self resetting function

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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