CN101281089B - Composite material prick pipe structure wind load simulation test method - Google Patents

Abstract

The invention belongs to the simulation research field. A proposed wind load simulation research method for a composite material conical tube structure comprises steps as follows: firstly obtaining the distribution of the trapezoidal load on the conical tube structure, determining the load position of central concentrated load, determining the central concentrated load, the flexivity of the conical tube structure, measuring and leveling the primary standard to conduct flexivity test. Adopting a method of local load through exerting multipoint instead of wind tunnel trial to measure the flexivity of the conical tube structure under certain wind speed, the invention has the advantages of simple operation, short test period, low cost and reliable result, besides, the invention not only can be used for the wind load simulation research method for chimney, telegraph pole and antenna conical tube structure composite materials, but also can be used for the wind load simulation research method for column-shaped and beam-shaped composite material structures, having prominent military and economic benefits.

Description

A kind of composite material prick pipe structure wind load simulation test method

Technical field

The invention belongs to the simulation test research field, mainly propose a kind of composite material prick pipe structure wind load simulation test method.

Background technology

Along with people progressively approve performance of composites, various types of compound substances constantly are applied in the every field of national economy, this wherein just comprises conical tube structure composite products such as chimney, electric pole and antenna, these goods generally adopt conical tube structure, its length all has higher technical requirement from one, two meter to more than 100 meters to amount of deflection and destruction situation under goods deadweight and the certain wind speed.

Wind load test is for a long time normally carried out in wind-tunnel, wind tunnel test cost height, cycle are long, be unfavorable for goods control to cycle and cost in development process, bigger to these safety coefficient values in addition goods also there is no need to carry out very accurate flexure test in wind-tunnel.

Summary of the invention

Purpose of the present invention promptly is to propose a kind of composite material prick pipe structure wind load simulation test method, be used for substituting traditional wind tunnel test, solve composite material prick pipe structure wind load amount of deflection simulation test problems such as chimney, electric pole and antenna, and make this method have simple to operate, the test period is short, cost is low and high reliability features.

Method proposed by the invention is:

1, at first draw the distribution of conical tube structure upper trapezoid load, promptly proposing diameter is circle load in wind field of d

And the external diameter size at conical tube structure two ends brought into, promptly obtain the distribution of conical tube structure upper trapezoid load; This is by the prick pipe structure wind load Force Calculation, concerns P=v between blast that the object front is subjected in the wind field and the wind speed ²/ 1600kPa, wherein, P is the positive suffered blast of object, v is a wind speed.

2, determine the loading position of centre-point load:

The loading of centre-point load is undertaken by following dual mode: the I. conical tube structure is implemented 3 concentrated load and is loaded during less than 5m, and loading position is apart from the conical tube structure stiff end

With the L place, L is the length of conical tube structure; When II. conical tube structure length was more than or equal to 5m, the equidistant load mode of 2～3m was at interval adopted in centre-point load, and for the bigger goods of length, the interval that applies centre-point load also can be bigger.

3, determine centre-point load

When conical tube structure adopted n load(ing) point, the length of each load(ing) point fixed distance end was respectively L ₁, L ₂..., L _n, its corresponding centre-point load F ₁, F ₂..., F _nCan by under establish an equation definite,

F ₁×L ₁+F ₂×L ₂+Λ+F _n×L _n＝M(0)

F ₂×(L ₂-L ₁)+A+F _n×(L _n-L ₁)＝M(L ₁)

…

F _n×(L _n-L _n-1)＝M(L _n-1)

Wherein, $M\left(x\right)=\frac{q_{\max }{(L-x)}^2}{2}-\frac{q_{\max }-q_{\min }}{2L}x{(L-x)}^2-\frac{q_{\max }-q_{\min }}{3L}{(L-x)}^3$

Wherein, q _MaxBe the load of conical tube structure bottom, q _MinLoad for the conical tube structure top.

4, conical tube structure deflection test benchmark smoothing

The benchmark smoothing divides following two steps: the one, and the smoothing of conical tube structure base reference for installation, the 2nd, test benchmark smoothing.

5, deflection test

According to the aforementioned calculation magnitude of load with load the position imposed load, and draw the deflection value at each position by test conical tube structure each point and test benchmark change in location.

The present invention adopts the method that applies multi-point partial load to substitute wind tunnel test and tests the amount of deflection of conical tube structure under certain wind speed, adopt that this method is simple to operate, the test period is short, cost is low, reliable results, can not only be used for chimney, electric pole and antenna conical tube structure compound substance wind load simulation test, also can be used for composite structure wind load simulation tests such as cylindricality, beam shape, have significant military benefit and economic benefit.

Description of drawings

Accompanying drawing 1 is electric pole wind load test synoptic diagram of the present invention.

1, electric pole, 2, the test benchmark face, 3, the base datum clamp face, F1, F2, F3, imposed load size, W1, W2, W3, imposed load position.

Embodiment

Embodiment 1

Certain compound substance conical tube structure electric pole, length is 8m, and top diameter is 30mm, and base diameter is 150mm, the deflection test under the wind speed 45m/s.

1. this conical tube structure electric pole wind load Force Calculation

The load of electric pole bottom is $q_{\max }=\frac{\mathrm{\π}\×0.15\×{45}^2}{6400}=0.149\mathrm{kN}/m$

The load at electric pole top is $q_{\min }=\frac{\mathrm{\π}\×0.03\×{45}^2}{6400}=29.8N/m.$

2. the centre-point load loading position determines

According to the principle that technical scheme is determined, this electric pole adopts 4 loadings, and the position of each load(ing) point fixed distance end is respectively 2m, 4m, 6m and 8m.

3. centre-point load determines

2m, 4m, 6m and 8m, corresponding centre-point load F ₁, F ₂, F ₃And F ₄Establish an equation under satisfying:

F ₁×2+F ₂×4+F ₃×6+F ₄×8＝2225.1N

F ₂×2+F ₃×4+F ₄×6＝1072.8N

F ₃×2+F ₄×4＝397.3N

F ₄×2＝79.5N

Obtain F ₁=238.4N, F ₂=178.8N, F ₃=119.2N, F ₄=39.8N.

4. electric pole deflection test benchmark smoothing

The benchmark smoothing divides following two steps: the one, and the smoothing of electric pole base reference for installation, the 2nd, test benchmark smoothing.

5. deflection test

According to aforementioned calculation magnitude of load and loading position imposed load, load mode is with reference to above synoptic diagram, and test wires bar each point and test benchmark change in location draw the deflection value at each position.

If Taper Pipe horizontal positioned in the imposed load mode wherein, the mode of available suspension weight is implemented to load, and vertically becomes other angle to place the mode of available adjustment tautness meter as Taper Pipe, also can adopt the mode of horizontal positioned to implement to load, deduct the amount of deflection that horizontal positioned gravity produces.

Claims (1)

1. composite material prick pipe structure wind load simulation test method, it is characterized in that: described composite material prick pipe structure wind load simulation test method is:

A, at first draw the distribution of conical tube structure upper trapezoid load, promptly proposing diameter is circle load in wind field of d

And the external diameter size at conical tube structure two ends brought into, promptly obtain the distribution of conical tube structure upper trapezoid load; This is by the prick pipe structure wind load Force Calculation, concerns P=v between blast that the object front is subjected in the wind field and the wind speed ²/ 1600kPa, wherein, P is the positive suffered blast of object, v is a wind speed;

B, determine the loading position of centre-point load: the loading of centre-point load is undertaken by following dual mode: the I. conical tube structure is implemented 3 concentrated load and is loaded during less than 5m, and loading position is apart from the conical tube structure stiff end

With the L place, L is the length of conical tube structure; When II. conical tube structure length was more than or equal to 5m, the equidistant load mode of 2～3m was at interval adopted in centre-point load, and for the bigger goods of length, the interval that applies centre-point load also can be bigger;

C, determine centre-point load: when conical tube structure adopted n load(ing) point, the length of each load(ing) point fixed distance end was respectively L ₁, L ₂..., L _n, its corresponding centre-point load F ₁, F ₂..., F _nCan by under establish an equation definite,

F ₁×L ₁+F ₂×L ₂+Λ+F _n×L _n＝M(0)

F ₂×(L ₂-L ₁)+Λ+F _n×(L _n-L ₁)＝M(L ₁)

…

F _n×(L _n-L _n-1)＝M(L _n-1)

Wherein, $M\left(x\right)=\frac{q_{\max }{(L-x)}^2}{2}-\frac{q_{\max }-q_{\min }}{2L}x{(L-x)}^2-\frac{q_{\max }-q_{\min }}{3L}{(L-x)}^3$

Wherein, q _MaxBe the load of conical tube structure bottom, q _MinLoad for the conical tube structure top;

D, the smoothing of conical tube structure deflection test benchmark: the benchmark smoothing divides following two steps: the one, and the smoothing of conical tube structure base reference for installation, the 2nd, test benchmark smoothing;

E, deflection test: according to the aforementioned calculation magnitude of load with load the position imposed load, and draw the deflection value at each position by test conical tube structure each point and test benchmark change in location.

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