CN103898830A - Vibration controller and cable-stayed bridge system based on same and in construction stage - Google Patents
Vibration controller and cable-stayed bridge system based on same and in construction stage Download PDFInfo
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Abstract
The invention discloses a vibration controller and a cable-stayed bridge system based on the vibration controller and in a construction stage. The vibration controller and the cable-stayed bridge system based on the vibration controller and in the construction stage comprise a shell body of a cuboid structure, wherein lateral faces of the shell body are respectively provided with a plurality of lines of holes, and the bottom surface and the top of the shell body are respectively of a square structure. The vibration controller and the cable-stayed bridge system based on the vibration controller and in the construction stage further comprise a bearing platform, a stiffening beam, a bridge tower and two brakes hung in water, wherein the bridge tower is vertically fixed to the bearing platform, the brakes are hung in water through steel cables at the two ends of the stiffening beam, the bridge tower is provided with a plurality of connecting joints in the longitudinal direction, the stiffening beam is provided with a plurality of connecting joints in the transverse direction, and the connecting joints on the bridge tower and the corresponding connecting joints on the stiffening beam are connected through stay cables. The vibration controller and the cable-stayed bridge system based on the vibration controller and in the construction stage are high in vibration controlling capacity.
Description
Technical field
The invention belongs to bridge design field, be specifically related to the cable stayed bridge system of a kind of damping device and the construction stage based on this damping device.
Background technology
Cable stayed bridge is in work progress; girder often adopts erection by protrusion construction, before girder not yet joins the two sections of a bridge, etc, under the impact due to structural factors such as suspension cable, end bay auxiliary pier and construction Temporary Piers; often there will be the wind unfavoured state of shaking, this phenomenon has also obtained confirmation in wind tunnel test.Therefore, can not ignore the wind-induced vibration response of Cable-Stayed Bridges.
At present, mainly adopt the methods such as TMD, MTMD and temporary rest pier for the control method of the maximum two during Cantilever Construction wind-induced vibrations of cable stayed bridge.
Tuned mass damper (Tuned Mass Damper is called for short TMD) is that effectively it is also one of control method being most widely used in engineering to the control of wind induced structural vibration response.At present, TMD is for the validity of structural vibration control by a large amount of case histories is confirmed, still, the control effect of single TMD is to comparatively sensitivity of its frequency, and when frequency is slightly when off-design value, control effect just can greatly decline.Only have when the natural frequency of TMD system and be transferred to when consistent with structure controlled frequency, TMD system just can reach optimal control results.That is to say that TMD is very responsive to structural vibration frequency change, once structural vibration frequency changes, departed from the natural frequency of TMD, TMD system can decline greatly to the vibration isolation effect of structure, even aggravates the vibration (imbalance) of structure.
And adopt multiple TMD (Multiple Tuned Mass Dampers is called for short MTMD) to make its frequency distribution within the specific limits, can improve the robustness of control system, to reach good effectiveness in vibration suppression.MTMD system is very obvious for the advantage of TMD system, is mainly manifested in: the effective controlled frequency of (1) MTMD system during to structure control is not a single numerical value, but has certain control range; (2), under any mass ratio, the effectiveness in vibration suppression of MTMD system is than the good damping result of TMD system; (3) with respect to single TMD, MTMD system can be decomposed into the mass of single massiveness multiple small and light masses, is of value in engineering and makes, installs and use, and more easily in engineering construction, promotes.
In addition, large span stayed-cable bridge cantilever construction is also often used wind resistance temporary rest pier, comprise: a pier foundation, on a pier foundation, be at least provided with 5 vertical steel pipe posts, be connected with a distribution beam in the upper end of steel pipe post, wherein two rocker bar bearings are symmetrically located in distribution beam, and the slide plate of rocker bar bearing upper end is connected with cantilever girder by anchor pole; Upper end at steel pipe post is also provided with many cable wind ropes.Although but above-mentioned wind-resistance measures can be obtained certain damping effect, their cost is costliness and work progress more complicated comparatively.
Summary of the invention
The object of the invention is to overcome the shortcoming of above-mentioned prior art, the cable stayed bridge system of a kind of damping device and the construction stage based on this damping device is provided, this damping device and system effectively damping ability are strong.
For achieving the above object, the present invention includes the housing of rectangular structure, the lateral longitudinal of housing is to being provided with some row hole, bottom surface and the top of housing are square structure, and in use procedure, described damping device is suspended in water, water can be in damping device turbulization, thereby realize the object of damping.
Described housing left and right sides are provided with N row hole, and N is positive integer, and the left surface of housing is vertical with the direction of current.
On the two sides, front and back of described housing, be equipped with a row hole.
The length of described housing is 3 meters, and wide is 3 meters, and height is 5 meters.
The middle part of described housing left surface and the middle part of right flank are equipped with a row hole, and the diameter in hole is 15com.
It is 6com hole that the middle part of the left and right sides of described housing all offers five row diameters, and the spacing between adjacent two row holes is 45com, and the middle part of the two sides, front and back of housing all offers a row hole, and the diameter in hole is 30com.
Accordingly, the present invention also provides the cable stayed bridge system of a kind of construction stage, comprise cushion cap (1), stiff girder (2), bridge tower (3) and hang on two brakes in water, bridge tower (3) is erect and is fixed on cushion cap (1), the two ends of stiff girder (2) are all suspended to brake in water by cable wire, bridge tower is longitudinally provided with some connected nodes on (3), stiff girder is horizontally arranged with some connected nodes on (2), and the connected node on bridge tower (3) is connected by suspension cable with the upper corresponding connected node of stiff girder (2).
The present invention has following beneficial effect:
The side of the damping device in the present invention is provided with some row hole, in the time that damping device is suspended in water, water can be in damping device turbulization, in the cable stayed bridge system of construction stage, the two ends of damping device and stiff girder are connected by cable wire, in the time that vibration occurs stiff girder, drive damping device under water to move, because damping device is suspended in water, the underwater reciprocating motion of damping device can be subject to the drag effect of water, thereby reaches the object of power consumption damping.
Accompanying drawing explanation
Fig. 1 is the structural representation of the cable stayed bridge system of construction stage of the present invention;
Fig. 2 is the pressure cloud atlas of contrast model in the present invention;
Fig. 3 is the speed cloud atlas of contrast model in the present invention;
Fig. 4 is the sectional view of model 1 in the present invention;
Fig. 5 is that in the present invention, model 1 is suspended to the pressure cloud atlas in water;
Fig. 6 is that in the present invention, model 1 is suspended to the speed cloud atlas in water;
Fig. 7 is that in the present invention, model 1 is suspended to the streak line distribution map in water;
Fig. 8 is the sectional view of model 2 in the present invention;
Fig. 9 is that in the present invention, model 2 is suspended to the pressure cloud atlas in water;
Figure 10 is that in the present invention, model 2 is suspended to the speed cloud atlas in water;
Figure 11 is that in the present invention, model 2 is suspended to the streak line distribution map in water;
Figure 12 is the sectional view of model 3 in the present invention;
Figure 13 is that in the present invention, model 3 is suspended to the pressure cloud atlas in water;
Figure 14 is that in the present invention, model 3 is suspended to the speed cloud atlas in water;
Figure 15 is that in the present invention, model 3 is suspended to the streak line distribution map in water;
Figure 16 is the sectional view of model 4 in the present invention;
Figure 17 is that in the present invention, model 4 is suspended to the pressure cloud atlas in water;
Figure 18 is that in the present invention, model 4 is suspended to the speed cloud atlas in water;
Figure 19 is that in the present invention, model 4 is suspended to the streak line distribution map in water;
Figure 20 is the sectional view of model 5 in the present invention;
Figure 21 is that in the present invention, model 5 is suspended to the pressure cloud atlas in water;
Figure 22 is that in the present invention, model 5 is suspended to the speed cloud atlas in water;
Figure 23 is that in the present invention, model 5 is suspended to the streak line distribution map in water;
Figure 24 is the sectional view of model 6 in the present invention;
Figure 25 is that in the present invention, model 6 is suspended to the pressure cloud atlas in water;
Figure 26 is that in the present invention, model 6 is suspended to the speed cloud atlas in water;
Figure 27 is that in the present invention, model 6 is suspended to the streak line distribution map in water;
Figure 28 is the sectional view of model 7 in the present invention;
Figure 29 is that in the present invention, model 7 is suspended to the pressure cloud atlas in water;
Figure 30 is that in the present invention, model 7 is suspended to the speed cloud atlas in water;
Figure 31 is that in the present invention, model 7 is suspended to the streak line distribution map in water;
Figure 32 is the sectional view of model 8 in the present invention;
Figure 33 is that in the present invention, model 8 is suspended to the pressure cloud atlas in water;
Figure 34 is that in the present invention, model 8 is suspended to the speed cloud atlas in water;
Figure 35 is that in the present invention, model 8 is suspended to the streak line distribution map in water;
Figure 36 is the sectional view of model 9 in the present invention;
Figure 37 is that in the present invention, model 9 is suspended to the pressure cloud atlas in water;
Figure 38 is that in the present invention, model 9 is suspended to the speed cloud atlas in water;
Figure 39 is that in the present invention, model 9 is suspended to the streak line distribution map in water;
Figure 40 is the sectional view of model 10 in the present invention;
Figure 41 is that in the present invention, model 10 is suspended to the pressure cloud atlas in water;
Figure 42 is that in the present invention, model 10 is suspended to the speed cloud atlas in water;
Figure 43 is that in the present invention, model 10 is suspended to the streak line distribution map in water;
Figure 44 is the sectional view of model 11 in the present invention;
Figure 45 is that in the present invention, model 11 is suspended to the pressure cloud atlas in water;
Figure 46 is that in the present invention, model 11 is suspended to the speed cloud atlas in water;
Figure 47 is that in the present invention, model 11 is suspended to the streak line distribution map in water;
Figure 48 is the sectional view of model 12 in the present invention;
Figure 49 is that in the present invention, model 12 is suspended to the pressure cloud atlas in water;
Figure 50 is that in the present invention, model 12 is suspended to the speed cloud atlas in water;
Figure 51 is that in the present invention, model 12 is suspended to the streak line distribution map in water;
Figure 52 is the sectional view of model 13 in the present invention;
Figure 53 is that in the present invention, model 13 is suspended to the pressure cloud atlas in water;
Figure 54 is that in the present invention, model 13 is suspended to the speed cloud atlas in water;
Figure 55 is that in the present invention, model 13 is suspended to the streak line distribution map in water;
Figure 56 is the sectional view of model 14 in the present invention;
Figure 57 is that in the present invention, model 14 is suspended to the pressure cloud atlas in water;
Figure 58 is that in the present invention, model 14 is suspended to the speed cloud atlas in water;
Figure 59 is that in the present invention, model 14 is suspended to the streak line distribution map in water;
Figure 60 is the sectional view of model 15 in the present invention;
Figure 61 is that in the present invention, model 15 is suspended to the pressure cloud atlas in water;
Figure 62 is that in the present invention, model 15 is suspended to the speed cloud atlas in water;
Figure 63 is that in the present invention, model 15 is suspended to the streak line distribution map in water;
Figure 64 is the sectional view of model 16 in the present invention;
Figure 65 is that in the present invention, model 16 is suspended to the pressure cloud atlas in water;
Figure 66 is that in the present invention, model 16 is suspended to the speed cloud atlas in water;
Figure 67 is that in the present invention, model 16 is suspended to the streak line distribution map in water;
Figure 68 is the sectional view of model 17 in the present invention;
Figure 69 is that in the present invention, model 17 is suspended to the pressure cloud atlas in water;
Figure 70 is that in the present invention, model 17 is suspended to the speed cloud atlas in water;
Figure 71 is that in the present invention, model 17 is suspended to the streak line distribution map in water;
Figure 72 is the sectional view of model 18 in the present invention;
Figure 73 is that in the present invention, model 18 is suspended to the pressure cloud atlas in water;
Figure 74 is that in the present invention, model 18 is suspended to the speed cloud atlas in water;
Figure 75 is that in the present invention, model 18 is suspended to the streak line distribution map in water;
Figure 76 is the sectional view of model 19 in the present invention;
Figure 77 is that in the present invention, model 19 is suspended to the pressure cloud atlas in water;
Figure 78 is that in the present invention, model 19 is suspended to the speed cloud atlas in water;
Figure 79 is that in the present invention, model 19 is suspended to the streak line distribution map in water;
Figure 80 is the sectional view of model 20 in the present invention;
Figure 81 is that in the present invention, model 20 is suspended to the pressure cloud atlas in water;
Figure 82 is that in the present invention, model 20 is suspended to the speed cloud atlas in water;
Figure 83 is that in the present invention, model 20 is suspended to the streak line distribution map in water;
Figure 84 is the sectional view of model 21 in the present invention;
Figure 85 is that in the present invention, model 21 is suspended to the pressure cloud atlas in water;
Figure 86 is that in the present invention, model 21 is suspended to the speed cloud atlas in water;
Figure 87 is that in the present invention, model 21 is suspended to the streak line distribution map in water;
Figure 88 is the sectional view of model 22 in the present invention;
Figure 89 is that in the present invention, model 22 is suspended to the pressure cloud atlas in water;
Figure 90 is that in the present invention, model 22 is suspended to the speed cloud atlas in water;
Figure 91 is that in the present invention, model 22 is suspended to the streak line distribution map in water;
Figure 92 is the sectional view of model 23 in the present invention;
Figure 93 is that in the present invention, model 23 is suspended to the pressure cloud atlas in water;
Figure 94 is that in the present invention, model 23 is suspended to the speed cloud atlas in water;
Figure 95 is that in the present invention, model 23 is suspended to the streak line distribution map in water;
Figure 96 is the sectional view of model 24 in the present invention;
Figure 97 is that in the present invention, model 24 is suspended to the pressure cloud atlas in water;
Figure 98 is that in the present invention, model 24 is suspended to the speed cloud atlas in water;
Figure 99 is that in the present invention, model 24 is suspended to the streak line distribution map in water.
Wherein, 1 is that cushion cap, 2 is that stiff girder, 3 is bridge tower.
The specific embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
With reference to figure 1, the cable stayed bridge system of construction stage of the present invention comprises cushion cap 1, bridge tower 3, stiff girder 2, bridge tower 3 and hang on two brakes in water, bridge tower 3 is erect and is fixed on cushion cap 1, the two ends of stiff girder 2 are all suspended to brake in water by cable wire, on bridge tower 3, be longitudinally provided with some connected nodes, on stiff girder 2, be horizontally arranged with some connected nodes, connected node on bridge tower 3 is connected by suspension cable with corresponding connected node on stiff girder 2, described damping device comprises the housing of rectangular structure, the lateral longitudinal of housing is to being provided with some row hole, bottom surface and the top of housing are square structure, in use procedure, water can be in damping device turbulization, thereby realize the object of damping.
According to symmetry with produce turbulent requirement as far as possible, design the profile of damping device: in the damping device surface punching of interior void, make current in the inner turbulization of damping device, thereby reach the object of power consumption.
The resistance that damping device is subject at underwater exercise is divided into pressure and viscous force two parts:
F
d=F
p+F
v (1)
Wherein, F
dthe resistance of-damping device; F
pthe surface pressing of-damping device is poor; F
vthe Surface adhesion force of-damping device.Can find out, large-sized damper surface pressing and viscous force are large, thereby can more effectively provide damping, but the instructions for use of easy construction needs again damping body long-pending as far as possible little, propose to make it produce turbulent flow when the underwater exercise by changing damping device profile, under the prerequisite that keeps damping device size, increased the scheme of the resistance that damping device is subject to.
According to the damping device instructions for use of construction stage, the fixing wirerope at maximum two cantilevers place is proposed, stiff girder 2 is connected with damping device.In the time there is vibration in stiff girder 2, will drive the motion of damping device, the reciprocating motion of damping device is subject to the drag effect of water, thereby reaches the object of power consumption damping.
To illustrate by emulation below
For verify closed perforate under water damping device by the validity of the effect of shaking, to adopt cfdrc Fluent to carry out numerical simulation calculation to the resistance coefficient of damping device below, for reducing amount of calculation, be two dimensional surface model by three-dimensional model simplifying, adopt the method for scaled down, reflection percent opening, aperture size and the affect variation tendency of aperture spacing on resistance coefficient, calculating parameter is as follows:
A. damping device size: 20 × 20cm;
B. fluid: water, density p=1000Kg/m
3, viscosity, mu=1 × 10
-3pas;
C. fringe conditions: damping device upstream is speed entrance, both sides are symmetrical border, and outlet border is fully developed flow, and model surface is hydraulically smooth surface;
D. computational fields determine: computational fields size determine with fringe conditions do not affect closed perforate under water damping device ambient pressure distribute be as the criterion, entrance and both sides are 100cm apart from damping device, export be 200cm apart from damping device;
E. turbulence model: adopt the reynolds stress model of two-dimentional 5 equations to calculate turbulent flow, use nonstationary flow calculates, stable to resistance coefficient in initial step iteration, be calculated to 5s with the time step of 0.001s, final resistance coefficient is in the resistance coefficient average in 5s.
In simulation process, the side of setting the damping device in contrast model does not arrange any perforate, and its suspention to the pressure cloud atlas in water and flow path line chart as shown in Figures 2 and 3.
Emulation experiment one
With reference to figure 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Figure 10, Figure 11, Figure 12, Figure 13, Figure 14, Figure 15, Figure 16, Figure 17, Figure 18 and Figure 19, the middle part of described housing left surface and the middle part of right flank are equipped with a row hole, the left surface of housing is vertical with the direction of current, in simulation process, get respectively four models, wherein the diameter of model 1 mesopore is 1cm, the diameter of model 2 mesopores is 2cm, model 3 mesopores be directly 3cm, model 4 mesopores be directly 4cm.
After the perforate of damping device, current enter damping device inside by aperture, drive the motion of damping device internal flow, the streak line demonstration of damping device inside, damping device inside has produced the vortex of different sizes, and vorticla motion is subject to the effect of fluid viscous power, thereby make the vorticla motion of damping device inside stronger, fluid is subject to viscous force larger, thereby dissipates more multipotency, increases resistance coefficient.But perforate meeting directly reduces surface pressing, reduce again resistance coefficient, and the outside that perforate also can affect damping device streams form, thereby affect the size of damping device resistance.
The inner vortex of model 1 is relatively mild, the inside vortex relative complex of model 2, model 3 and model 4.Along with perforate increases, the rate of outflow of damping device downstream orifice increases.Can find out from the streak line of model 4, current are almost to flow out straight downstream orifice from upstream orifice.Find out from speed cloud atlas, it is almost equal with the water velocity that flows out damping device that model 4 flows into damping device, and this must reduce damping device surface pressing.To the damped coefficient result of calculation of model 1～4 as shown in following table 5-1.
Table 5-1
Result of calculation demonstration, the damping device resistance coefficient of opening diameter 1cm and diameter 2cm is larger, and opening diameter is that the damping device of 3cm and 4cm is because the loss resistance of surface pressing is less than the damping device of not perforate.
Emulation experiment two
With reference to Figure 20, Figure 21, Figure 22, Figure 23, Figure 24, Figure 25, Figure 26, Figure 27, Figure 28, Figure 29, Figure 30, Figure 31, Figure 32, Figure 33, Figure 34, Figure 35, Figure 36, Figure 37, Figure 38 and Figure 39, on the left surface of described housing and right flank, be equipped with two row holes, the left surface of housing is vertical with the direction of current, if the diameter in hole is 1cm, in simulation process, make respectively five models, wherein, spacing in model 5 between two row holes is 1cm, spacing in model 6 between two row holes is 2cm, spacing in model 7 between two row holes is 3cm, spacing in model 8 between two row holes is 4cm, spacing in model 9 between two row holes is 9cm.
The inner flow path line chart of damping device in biserial hole is compared with the complexity of single hole, and along with pitch-row increases, the vortex of damping device inside turns smaller volume, and quantity increases, and mobile speed increases.Infer thus, increase with pitch-row, the viscous force of damping device water flow inside increases the consumption of energy, meanwhile, the difference of position of opening also affects the form that outside is streamed, and in the flow path line chart of model 6, can clearly see, in damping device downstream surface, adhere to two vortexs, form low-pressure area, enlarge markedly current at the active force flowing to damping device, thereby increase the resistance coefficient of damping device.To the damped coefficient result of calculation of model 5～9 as table 5-2 as shown in.
Table 5-2
Emulation experiment three
With reference to Figure 40, Figure 41, Figure 42, Figure 43, Figure 44, Figure 45, Figure 46, Figure 47, Figure 48, Figure 49, Figure 50, Figure 51, Figure 52, Figure 53, Figure 54 and Figure 55, on the left surface of described housing and right flank, be equipped with two row holes, the left surface of housing is vertical with the direction of current, if the diameter in hole is 2cm, in simulation process, make respectively four models, wherein, spacing in model 10 between two row holes is 3cm, spacing in model 11 between two row holes is 4cm, model 12 is that the spacing between two row holes is 5cm, and the spacing between 13 liang of row holes of model is 6m.
The distortion more that the double porosity model of diameter 2cm is 1cm at the streak line of damping device inside compared with aperture, liquid form is more complicated, consumes energy more.But the perforate spacing of model is to the effect of damping device internal flow not obvious, and the outside form of streaming does not have certainty to change yet simultaneously, and the numerical simulation resistance coefficient result of calculation of above model is as shown in following table 5-3:
Table 5-3
Contrast opening diameter is the two group model resistance coefficient result of calculations that 1cm and opening diameter are 2cm, and the former resistance coefficient is larger, although the latter is more complicated flowing of damping device inside, consumes energy larger, is not enough to make up the surface pressing of perforate excessive loss.
Emulation experiment four
With reference to Figure 56, Figure 57, Figure 58, Figure 59, Figure 60, Figure 61, Figure 62, Figure 63, Figure 64, Figure 65, Figure 66 and Figure 67, in simulation process, the impact of the quantity in hole and the spacing in two row holes is described by three group models, wherein, in model 16, the left and right sides of damping device all offer three row holes, the diameter in hole is 1cm, and the spacing in two row holes is 4cm, and every row hole is 4.5cm to the distance at damping device edge; In model 15, the left and right sides of damping device all offer four row holes, hole be directly 1cm, the spacing of two row between holes are 3cm, two row holes are 3.5cm to the distance at damping device edge; In model 14, the left and right sides of damping device all offer six row holes, and the spacing between two row holes is 2cm, and two row holes are 2cm to the distance at damping device edge.
Pitch of holes downstream part at model 14 to model 16, the tortuous lopping of streak line, illustrate that vortex forms, the low pressure that vortex produces can improve the active force of current to damping device, increase the resistance coefficient of damping device, the separation point of vortex is also with the variation that increases of perforate: large vortex comes off from damping device both sides, and has micro cyclone to come off on the downstream face of damping device.In addition, the inner streak line of the damping device of model 14 to 16 does not have significantly regular difference.To the resistance coefficient numerical simulation calculation result of model 14～16 as table 5-4 as shown in.
Table 5-4
Emulation experiment five
With reference to Figure 68, Figure 69, Figure 70, Figure 71, Figure 72, Figure 73, Figure 74, Figure 75, Figure 76, Figure 77, Figure 78 and Figure 79, this emulation experiment is for two sides perforate before and after damping device, being provided with respectively three group models detects, model 17 is on the basis of model 14, before and after damping device, the middle part of two sides offers a row hole, and the diameter of its mesopore is 1cm; Model 18 is on the basis of model 15, and before and after damping device, the middle part of two sides offers a row hole, and the diameter of its mesopore is 1cm; Model 19 is on the basis of model 16, and before and after damping device, the middle part of two sides offers a row hole, and the diameter of its mesopore is 1cm.
The middle part perforate of two sides makes the mobile of damping device inside become very disorderly before and after damping device, and the maelstrom during by the middle part perforate of two sides, front and back changes the micro cyclone of One's name is legion into.Vortex in two downstreams, span region still exists, and outside is streamed the vortex coming off from both sides and also diminished a little.To the result of calculation of model 17～19 as table 5-5 as shown in.
Table 5-5
From table 5-5, can increase a little resistance coefficient at the aperture of damping device side opening 1cm.
Emulation experiment six
With reference to Figure 80, Figure 81, Figure 82, Figure 83, Figure 84, Figure 85, Figure 86 and Figure 87, this emulation experiment judges diameter and the impact of quantity on damping device damping of perforate by the emulation of two models, wherein, in model 20, the middle part of damping device left and right sides all offers five liang of row holes, the spacing in adjacent two row holes is 3cm, it is 3cm that the distance that is clipped to damping device edge is divided in hole, before and after damping device, the middle part of two sides is equipped with a row hole simultaneously, and in model 20, the diameter of damping device mesopore is 0.4cm; In model 21, the middle part of damping device left and right sides all offers four row holes, spacing between adjacent two row holes is 3.6cm, the hole at edge is 3.6cm to the spacing at damping device edge, before and after damping device, the middle part of two sides all offers a row hole in addition, and in model 21, the diameter in the hole of damping device is 0.5cm.
Emulation experiment seven
With reference to Figure 88, Figure 89, Figure 90, Figure 91, Figure 92, Figure 93, Figure 94, Figure 95, Figure 96, Figure 97, Figure 98 and Figure 99, the impact of the damping effect of the pore size that this emulation experiment seven judges two sides perforate before and after damping device by the emulation of three models on damping device.Wherein in model 22, the middle part of damping device left and right sides all offers 5 row holes, spacing between adjacent two row holes is 3cm, in damping device left and right sides, the diameter in hole is 0.4cm, and in model 22, before and after damping device, the middle part of two sides all offers a row hole in addition, and the diameter of its mesopore is 1cm; In model 23, the middle part of damping device left and right sides offers five row holes, the spacing in adjacent two row holes is 3cm, in damping device left and right sides, the diameter in hole is 0.4cm, in model 23, before and after damping device, the middle part of two sides all offers a row hole in addition, the diameter of its mesopore is 2cm, and model 24 is that with the difference of model 23 diameter in hole on two sides, damping device front and back is 4cm.
Hole before and after damping device on both sides can increase the inner quantity of vortex on a small scale of damping device, contrasts three models, and side opening is of a size of the model 23 damping device internal flows disorder the most of 2cm.Result of calculation is as shown in following table 5-6.
Table 5-6
In table, data show, can reduce resistance coefficient to the lateral opening hole of model 19, but with the not linear correlation of size of perforate, the model resistance coefficient of excessive or too small lateral opening hole sharply reduces, when aperture during at 2cm resistance coefficient reduce less.
Closed perforate under water damping device has remarkable effect to increasing resistance coefficient, can effectively reduce the wind-induced vibration of the maximum two during Cantilever Constructions of cable stayed bridge.Therefore, can replace the methods such as TMD, MTMD and temporary rest pier, so not only can reduce engineering quantity, cost-saving, and also its construction is simple, convenient, economical, can either guarantee normal cantilever construction, does not affect into again the structure of bridge.To reach the object that ensures bridge construction quality, construction equipment and personal security.
Claims (7)
1. a damping device, is characterized in that, comprises the housing of rectangular structure, the lateral longitudinal of housing is to being provided with some row hole, and bottom surface and the top of housing are square structure, in use procedure, described damping device is suspended in water, water can be in damping device turbulization, thereby realize the object of damping.
2. damping device according to claim 1, is characterized in that, described housing left and right sides are provided with N row hole, and N is positive integer, and the left surface of housing is vertical with the direction of current.
3. damping device according to claim 1, is characterized in that, is equipped with a row hole on the two sides, front and back of described housing.
4. damping device according to claim 1, is characterized in that, the length of described housing is 3 meters, and wide is 3 meters, and height is 5 meters.
5. damping device according to claim 1, is characterized in that, the middle part of described housing left surface and the middle part of right flank are equipped with a row hole, and the diameter in hole is 15com.
6. damping device according to claim 1, it is characterized in that, it is 6com hole that the middle part of the left and right sides of described housing all offers five row diameters, and the spacing between adjacent two row holes is 45com, the middle part of the two sides, front and back of housing all offers a row hole, and the diameter in hole is 30com.
7. the cable stayed bridge system of a construction stage, based on damping device claimed in claim 1, it is characterized in that, comprise cushion cap (1), stiff girder (2), bridge tower (3) and hang on two brakes in water, bridge tower (3) is erect and is fixed on cushion cap (1), the two ends of stiff girder (2) are all suspended to brake in water by cable wire, bridge tower is longitudinally provided with some connected nodes on (3), stiff girder is horizontally arranged with some connected nodes on (2), connected node on bridge tower (3) is connected by suspension cable with the upper corresponding connected node of stiff girder (2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310697917.7A CN103898830A (en) | 2013-12-18 | 2013-12-18 | Vibration controller and cable-stayed bridge system based on same and in construction stage |
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| CN201310697917.7A CN103898830A (en) | 2013-12-18 | 2013-12-18 | Vibration controller and cable-stayed bridge system based on same and in construction stage |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112853925A (en) * | 2021-01-11 | 2021-05-28 | 大连理工大学 | Hang down and swing board active control device of suppression cross-sea bridge flutter |
| CN113005880A (en) * | 2021-03-08 | 2021-06-22 | 大连理工大学 | Pulley-heave block device for inhibiting large-span bridge from fluttering |
| CN116070333A (en) * | 2023-03-16 | 2023-05-05 | 石家庄铁道大学 | Stay cable aerodynamic force calculation method, system and terminal considering Reynolds number effect |
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| JPH0841824A (en) * | 1994-07-29 | 1996-02-13 | Kajima Corp | Vibration control device on erection of diagonal tension bridge |
| CN1916288A (en) * | 2006-09-05 | 2007-02-21 | 武汉理工大学 | Hybrid system for controlling longitudinal vibration reaction of girder of cable stayed bridge in float type |
| US7743444B2 (en) * | 2004-06-09 | 2010-06-29 | Incorporated Administrative Agency Public Works Research Institute | Cable stayed suspension bridge making combined use of one-box and two-box girders |
| CN202925468U (en) * | 2012-08-13 | 2013-05-08 | 长安大学 | Underwater damper for arched steel tower in construction condition |
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| JPH0841824A (en) * | 1994-07-29 | 1996-02-13 | Kajima Corp | Vibration control device on erection of diagonal tension bridge |
| US7743444B2 (en) * | 2004-06-09 | 2010-06-29 | Incorporated Administrative Agency Public Works Research Institute | Cable stayed suspension bridge making combined use of one-box and two-box girders |
| CN1916288A (en) * | 2006-09-05 | 2007-02-21 | 武汉理工大学 | Hybrid system for controlling longitudinal vibration reaction of girder of cable stayed bridge in float type |
| CN202925468U (en) * | 2012-08-13 | 2013-05-08 | 长安大学 | Underwater damper for arched steel tower in construction condition |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112853925A (en) * | 2021-01-11 | 2021-05-28 | 大连理工大学 | Hang down and swing board active control device of suppression cross-sea bridge flutter |
| CN113005880A (en) * | 2021-03-08 | 2021-06-22 | 大连理工大学 | Pulley-heave block device for inhibiting large-span bridge from fluttering |
| CN116070333A (en) * | 2023-03-16 | 2023-05-05 | 石家庄铁道大学 | Stay cable aerodynamic force calculation method, system and terminal considering Reynolds number effect |
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Application publication date: 20140702 |