CONSTRUCTION STEEL PLATFORM SYSTEM USING TUNED LIQUID DAMPER (TLD) AND TUNED MASS DAMPER (TMD) FOR COMPOSITE TUNED DAMPING

Abstract

A construction steel platform system using a tuned liquid damper (TLD) and a tuned mass damper (TMD) for composite tuned damping is provided. According to the construction steel platform system using a TLD and a TMD for composite tuned damping, a composite damper is composed of the TLD and the TMD overlapping each other, and a construction steel platform is placed above the double dampers. By adjusting a hole diameter of a partition plate in the TLD, a liquid level in a water tank, a stiffness of a spring at an edge of a friction support and mass of materials of a top of the steel platform, the whole steel platform system can achieve composite tuned damping. The TLD and the TMD can be flexibly combined in series or in parallel according to requirements of actual wind and earthquake loads.

Claims

1. A construction steel platform system using a tuned liquid damper (TLD) and a tuned mass damper (TMD) for a composite tuned damping, comprising a water tank, an outer TMD plate, a construction steel platform, a rigid base plate, a water outlet/inlet, a partition plate, a partition plate insertion opening, a connecting bolt, a spring, a friction sliding block, a steel platform and TLD connecting support, a TMD and bottom structure connecting support, an upper friction support plate, a lower friction support plate and an inner TMD plate, wherein the TLD comprises the water tank, the partition plate and the water outlet/inlet, wherein the partition plate is insertable, the TMD comprises the outer TMD plate, the spring, the friction sliding block, the upper friction support plate, the lower friction support plate and the inner TMD plate, the TLD and the TMD are configured to be combined in series or in parallel according to requirements from a structure for a wind load and an earthquake load, to form the construction steel platform system for the composite tuned damping, the construction steel platform system is flexible, and the construction steel platform system is configured to reduce a vibration of the construction steel platform system under the wind load or the earthquake load.

2. The construction steel platform system using the TLD and the TMD for the composite tuned damping according to claim 1, wherein the water tank, the partition plate and the water outlet/inlet form the TLD, an overall height of the partition plate is controlled to be 0.5-0.8 times a height of the water tank, and a water stop is arranged in the partition plate insertion opening to prevent a water leakage after the partition plate is inserted, and water is injected into the water tank, the partition plate is replaceable at will, the partition plate is provided with a hole, a hole diameter is equal to 1/20- 1/30 of a width of double-layer partition plates, and the hole diameter is set according to actual conditions, TLDs under the construction steel platform system are distributed to form a distributed TLD system to perform a damping on the construction steel platform in a plurality of directions, and to absorb vibration energy in the plurality of directions.

3. The construction steel platform system using the TLD and the TMD for the composite tuned damping according to claim 2, wherein a first rigid base plate is arranged on the distributed TLD system and the first rigid base plate is connected to a distributed TMD system by the connecting bolt, a planar area of the first rigid base plate is more than five times a planar area of a single TLD, a second rigid base plate of the same specification as the first rigid base plate is arranged on the distributed TMD system, and the second rigid base plate is connected to the distributed TMD system by the connecting bolt, a plurality of TMDs are evenly distributed between the first rigid base plate and the second rigid base plate to form the distributed TMD system, the TMD comprises the outer TMD plate, the spring, the friction sliding block, the upper friction support plate, the lower friction support plate and the inner TMD plate, wherein an upper layer of the second rigid base plate is configured to horizontally slide along the distributed TMD system by the upper friction support plate, the large-scale construction steel platform is placed on the upper layer of the second rigid base plate, and the construction steel platform system is configured to slide horizontally on the second rigid base plate to achieve a tuned mass damping function.

4. The construction steel platform system using the TLD and the TMD for the composite tuned damping according to claim 1, wherein a top of the construction steel platform is divided into different functional zones, a portion of the different functional zones is configured to be used as material stacking areas, the TMD is merely placed below each of the material stacking areas, a mass of building materials in the material stacking areas is configured to serve as a mass block of a distributed TMD system, wherein in different construction stages, a first-order frequency of the construction steel platform system is adjusted by increasing or decreasing the mass of the building materials to flexibly achieve a tuned function, the friction sliding block is annular and arranged between a lower surface of the upper friction support plate and a top surface of the lower friction support plate, the friction sliding block has a thickness being 1-1.5 times a thickness of the lower friction support plate, the upper friction support plate, the lower friction support plate and the friction sliding block form a damping system, two damping systems are arranged in a vertically symmetric manner to form a damping portion of the TMD, the friction sliding block is made from a high-strength steel, or a high-strength alloy, an elastic modulus of the friction sliding block is greater than 3.2×10.sup.5 N/mm.sup.2 and a dynamic friction coefficient of the friction sliding block does not exceed 0.10, symmetric variable stiffness springs on four sides are arranged between the outer TMD plate and the inner TMD plate, a stiffness of each of the symmetric variable stiffness springs is adjusted in time according to a first-order frequency of a main building structure during a construction, and a ratio of the first-order frequency of the whole construction steel platform system above the upper friction support plate of a main platform to the first-order frequency of the main building structure is controlled to fall within 0.80-1.00.

5. The construction steel platform system using the TLD and the TMD for the composite tuned damping according to claim 1, wherein since many uncertain factors are produced in a floor structure under an actual wind load and an actual earthquake load, the TLD and the TMD are flexibly combined in series or in parallel according to requirements of the wind load and the earthquake load, when the TLD and the TMD are combined in a serial connection, the TMD and the TLD overlap each other without a support, and the TMD and the TLD are connected merely by the rigid base plate, and since the wind load has a wide spectrum, a damping range of the spectrum is broadened by the serial connection to achieve a damping effect, when the TMD and the TLD are combined in a parallel connection, the construction steel platform is connected to the TLD by the steel platform and TLD connecting support, the TMD is connected to a bottom structure under the TLD by the TMD and bottom structure connecting support to form a parallel type composite tuned damping form, and the steel platform and TLD connecting support and the TMD and bottom structure connecting support are configured to be flexibly disassembled, wherein the TLD and the TMD are configured to be flexibly changed from the serial connection to the parallel connection, to achieve a damping control over the construction steel platform system.

6. The construction steel platform system using the TLD and the TMD for the composite tuned damping according to claim 3, wherein firstly, a portion of vibration energy caused by the earthquake load or the wind load is absorbed by a liquid sloshing in the distributed TLD system, then a remaining vibration energy is further absorbed by a friction sliding between the spring and the friction sliding block of the distributed TMD system above the distributed TLD system, and the TLD and the TMD constitute a composite tuned damping damper configured for controlling a vibration response of the construction steel platform system.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG. 1 is a series three-dimensional effect diagram of a construction steel platform system using a tuned liquid damper (TLD) and a tuned mass damper (TMD) for composite tuned damping according to the present disclosure;

[0023] FIG. 2 is a parallel three-dimensional effect diagram of the construction steel platform system using a TLD and a TMD for composite tuned damping according to the present disclosure;

[0024] FIG. 3 is a series front view of the construction steel platform system using a TLD and a TMD for composite tuned damping according to the present disclosure;

[0025] FIG. 4 is a parallel front view of the construction steel platform system using a TLD and a TMD for composite tuned damping according to the present disclosure;

[0026] FIG. 5 is a series side view of the construction steel platform system using a TLD and a TMD for composite tuned damping according to the present disclosure;

[0027] FIG. 6 is a parallel side view of the construction steel platform system using a TLD and a TMD for composite tuned damping according to the present disclosure;

[0028] FIG. 7 is an internal cross-sectional view of the construction steel platform system using a TLD and a TMD for composite tuned damping according to the present disclosure;

[0029] FIG. 8 is a three-dimensional effect diagram of a TLD in the construction steel platform system using a TLD and a TMD for composite tuned damping according to the present disclosure;

[0030] FIG. 9 is a front view of the TLD in the construction steel platform system using a TLD and a TMD for composite tuned damping according to the present disclosure;

[0031] FIG. 10 is a three-dimensional effect diagram of a TMD in the construction steel platform system using a TLD and a TMD for composite tuned damping according to the present disclosure;

[0032] FIG. 11 is an internal cross-sectional view of the TMD in the construction steel platform system using a TLD and a TMD for composite tuned damping according to the present disclosure; and

[0033] FIG. 12 is a top view of the TMD in the construction steel platform system using a TLD and a TMD for composite tuned damping according to the present disclosure.

[0034] In the figures: 1—water tank, 2—outer TMD plate, 3—construction steel platform, 4—rigid base plate, 5—water outlet/inlet, 6—partition plate, 7—partition plate insertion opening, 8—connecting bolt, 9—spring, 10—friction sliding block, 11—steel platform and TLD connecting support, 12—TMD and bottom structure connecting support, 13—upper friction support plate, 14—lower friction support plate and 15—inner TMD plate.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Embodiment 1

[0035] Specific embodiments of the present disclosure will be described in detail below with reference to accompanying drawings.

[0036] FIG. 1 shows an embodiment of a construction steel platform system using a tuned liquid damper (TLD) and a tuned mass damper (TMD) for composite tuned damping according to the present disclosure. The construction steel platform system using a TLD and a TMD for composite tuned damping mainly includes a water tank 1, an outer TMD plate 2, a construction steel platform 3, a rigid base plate 4, a water outlet/inlet 5, a partition plate 6, a partition plate insertion opening 7, a connecting bolt 8, a spring 9, a friction sliding block 10, a steel platform and TLD connecting support 11, a TMD and bottom structure connecting support 12, an upper friction support plate 13, a lower friction support plate 14 and an inner TMD plate 15. Specific implementation steps are as follows:

[0037] A building is a high-rise frame-core tube commercial office building, with 40 floors, with a floor height of 38 m and a total height of 152 m. According to a planar area of a core tube, specifications of all components of the steel platform system are determined to meet requirements in the technical solution. Then, the construction steel platform system using a TLD and a TMD for composite tuned damping is attached to the core tube for construction.

[0038] Each TLD water tank has a length of 1.5 m, a width of 0.8 m, a height of 0.7 m and a depth of 0.5 m, and a liquid may be replaced through the water injection and drainage outlet at any time according to construction conditions. The insertable partition plate in the TLD may be replaced at any time by means of the partition plate insertion opening, a hole diameter may be changed, the partition plate has a length of 0.3 m, a width of 0.01 m and a height of 0.35 m. After the liquid in the water tank is blocked by the partition plate, the damping ratio of the water tank may be increased, such that the damping effect of the TLD on the construction steel platform is greatly improved. After measurement, the damping ratio of the construction steel platform is increased by 5 times after adding the TLD, from the original 1% to 4.8%, and displacement response is decreased by 35%-50% when the wind speed is 20 m/s.

[0039] Each TMD has a length of 1 m, a width of 0.6 m and a height of 0.5 m. The TMD overlaps the TLD, and the TMD and the TLD are connected to the rigid base plate therebetween by means of bolts to form the composite tuned damper. The TMD may achieve the optimal effect by adjusting the stiffness of the spring at the edge of the friction support and the mass of the materials of the top of the steel platform.

[0040] Every time the core tube in five floors is newly built, a first-order natural vibration frequency of a main structure is measured, and mass of the whole steel platform, an upper apparatus and the building materials are kept constant during construction. It is necessary to adjust a liquid level height of the TLD water tank and the hole diameter of the partition plate. The natural vibration frequency of the whole steel platform relative to the core tube may be changed by the stiffness of the spring in the TMD and the mass of the material in the material stacking area. Assuming that an earthquake occurs when the 25th floor of the core tube is constructed, the first-order natural vibration frequency of the core tube is 2.70 Hz, and a sum of the stiffnesses of the springs in all TMDs may be calculated by a formula of the natural vibration frequency should be 6,400 kN/m. As the whole platform is arranged by means of four distributed TMDs, each TMD has 24 variable stiffness springs, the whole platform is connected to the TMDs in parallel by means of 96 springs, the stiffness of each spring should be changed to 66.67 kN/m, and in this case, the natural vibration frequency of the whole steel platform is 2.4 Hz.

[0041] When the wind occurs, the composite tuned damper composed of the TLD and the TMD may effectively dissipate energy and achieve damping. A vibration acceleration index may meet international residential comfort standards, and the damping effect is remarkable. The composite tuned effect of the steel platform system has a desirable control effect on vibration of the core tube during construction, and the vibration energy is absorbed such that displacement of the top of the core tube under storm is well controlled. Compared with the case of absent damping, a peak acceleration decreases by 16.7%, and the horizontal displacement damping rate of the construction steel platform reaches 27.2%, thereby protecting safety of the building and workers.

[0042] When the wind is small, the water in the TLD water tank may be used as domestic water or fire water, which may effectively solve the problem of space occupation. Moreover, the TLD uses pure water, has low cost, and provides water sources and fire protection convenience for constructors. The top of the steel platform is divided into different functional zones, the area above the TMD is divided into areas such as a material stacking area, and building materials may be placed in the area according to the specific construction conditions. The building materials may serve as TMD mass blocks, so as to assist the TMD in tuning the mass for damping. In this case, the TLD and the TMD may be flexibly combined in series or in parallel according to the actual wind load and earthquake load requirements, which may more effectively reduce the vibration of the construction steel platform system under the wind load or the earthquake load. The design is very reasonable.

[0043] What is described above is a typical embodiment of the present disclosure, but the present disclosure is not limited thereto during implementation.