热铝合金门窗抗风压性能的计算原理

铝合金门窗的抗风压设计。

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铝合金门窗的抗风压设计。

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铝合金门窗的抗风压设计。

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铝合金门窗的抗风压设计。

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铝合金门窗的抗风压设计。

Calculating Principles for

performance of Resistance to Wind Pressure of Heat-insulating Aluminum Windows & Doors

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---- By He Zhencheng

Currently, the door & window and curtain wall companies are lacking theoretical calculation for performance of resistance to wind pressure of heat-insulating

Aluminum window and door. As there are not enough approaches, they feel

helpless. Thus, they make reference to some unscientific formulas for calculation. It results in two possibilities: first,

incompetent quality, and consequently leading to incipient fault of project quality; second, over higher safety coefficient in design leading to extravagancy.

According to engagers in the industry, the performance of resistance wind-pressure to heat-insulating aluminum door & window is stronger than that of plastic steel one. The former has been successfully applied in American skyscrapers for over 30 years, with a market share higher than 80%. How do foreign door & window designers calculate wind-pressure resistance strength? With the wide application of heat-insulating aluminum windows and doors, designers shall adopt calculation methods and formulas which they are familiar with, to ensure safety and

economy of designing solutions. In the following, I will take an analysis on this issue. Welcome your comment and hope this article could benefit experts in this field.

The question of this article lies: in case the width of heat-insulating profile is

60mm, vertical mullion is

identically far from side frames, when fixed window (insulating glass) in a size of 15001500 is under a positive wind pressure of 2500N/m2, what is the flexibility of mullion? And whether mullion bars of the window will have elastic deflection after wind pressure disappear? The water-tightness, air-tightness and temperature-maintenance functions of windows and doors can not be guaranteed, if the mullion bars have not elastic deflection.

In this case, the mullion is bearing two identical trapezoid loads and the flexibility of mullion shall be the sum of flexibilities under two trapezoidal loads. In practical project calculation, factors of safety calculated with evenly-distributed load are bigger than that with trapezoidal load, and it is easier to calculate. Therefore, evenly-distributed load is more adopted for calculation, whose linear load is represented by W0 (Newton/mm).

1.Calculating Method for Flexibility and Equivalent Inertia Moment of Heat-insulating Aluminum Profile.

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铝合金门窗的抗风压设计。

Figure 1

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1.1Calculation Principles

This article introduces a method for

estimating equivalent inertia moment of a simply-supported beam which has non-uniform section, and when the beam is under evenly distributed load. This model is a compound beam connected by relative hard-surface (such as Aluminum alloy) and soft core material (heat-insulating

polyurethane adhesive). The surface has axial strength and counter-bending strength. Here, it is assumed that the heat-insulating material is only resistant to shearing force. The following shall be noted: Young's

modulus of Aluminum profile is much bigger than that of the heat-insulating glue, while the former is considered in calculation of blending deflection, and the latter is

neglected. For example, Young's modulus of heat-insulating glue is 1650MPa, which accounts only 3% of the Aluminum profile (70000MPa). Polyurethane heat-insulating adhesive with a width of 12mm is equal to Aluminum alloy with a width of 0.39mm in effect.

The key problem in calculation of heat-insulating aluminum profile is shearing deflection of heat-insulating materials. When calculate simply-supported beam which is made of full aluminum alloy profile and bears evenly-distributed load, the formula is: Bernoulli'sEuler's Equation (EIy"=M), while its shearing deflection is neglected. However, if there are soft heat-

铝合金门窗的抗风压设计。

insulating materials on the axial-directional vertical bar steel of the profile, actions of ¡°compound¡± beam will become complex. Bearing load, area of cross section of compound¡± beam will change due to shearing deflection of heat-insulating materials which f …… 此处隐藏：14791字，全部文档内容请下载后查看。喜欢就下载吧 ……