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Effect of Glass Panel and PVB Thickness on Bearing Capacity of Unit Curtain Wall
DOI: 10.12677/HJCE.2022.1111141, PDF , HTML, XML, 下载: 115  浏览: 175

Abstract: China has become the largest producer and customer of curtain wall in the world, but safety accidents caused by curtain wall structure often occur. Selecting curtain wall with better strength during curtain wall construction stage can avoid accident risk effectively. This paper selects the curtain wall structure of a super high-rise building in Uzbekistan, and analyzes the influence of glass thickness and polyvinyl butyral (PVB) layer thickness on the stress of the glass curtain wall by constructing the finite element model of the whole system of the unit hollow laminated glass curtain wall. The results show that in a certain range, with the increase of glass thickness, the stress of this layer increases, the deflection decreases, and the stress of other layers decreases. When the PVB layer is increased, the stress and deflection of each layer of glass are slightly increased.

1. 引言

2. 单元式幕墙结构的计算

2.1. 中空夹胶玻璃幕墙受力性能

PVB胶片本构复杂，力学行为受胶层厚度、温度、加载时间等影响重大，力学性能参数难以选取。依据陶志雄 [9] PVB胶片剪切试验，本文依据实际工程情况，取PVB胶片的剪切模量为1.1 MPa，泊松比为0.49。

Table 1. Material properties of glass

$K=nk=\frac{\left({P}_{0}+{P}_{i}\right)A}{{d}_{0}}$ (1)

${P}_{i}={P}_{s}\frac{{t}_{2}^{3}}{{t}_{1}^{3}+{t}_{2}^{3}}$ (2)

2.2. 有限元计算模型

Figure 1. Analysis model of overall curtain wall system structure

2.3. 有限元计算与规范对比

Figure 2. Maximum stress contrast diagram

Figure 3. Comparison chart of maximum deflection

3. 受力性能影响因素分析

3.1. 玻璃厚度

Table 2. Material properties of glass

3.2. PVB夹胶层厚度

Figure 4. Maximum stress in the core of outer glass plate with different glass thickness

Figure 5. Maximum stress in the core of medium glass plate with different glass thickness

Figure 6. Maximum stress of inner glass plate core under different glass thicknesses

Figure 7. Average value of maximum deflection of glass plate core under different glass thicknesses

Table 3. Thickness change of adhesive layer of test piece

Figure 8. Maximum stress in the core of outer glass plate with different PVB sandwich thickness

Figure 9. Maximum stress in the core of medium glass plate with different PVB sandwich thickness

Figure 10. Maximum stress of inner glass plate core under different PVB sandwich thickness

Figure 11. Average deflection of glass plate core under different PVB sandwich thickness

4. 结论

1) 整体体系有限元分析下的玻璃面板挠度与规范计算值产生13.77%的负偏差。可以反映出在整体体系中，幕墙结构各构件的相互作用，可以提高玻璃面板的强度和稳定性。

2) 当玻璃厚度在一定范围内增加时，其弯曲刚度增加，分配荷载增大，使得该片玻璃应力增大，剩余玻璃应力减小；中空夹胶玻璃的挠度随玻璃厚度增加而降低，且内片玻璃厚度变化对强度和挠度影响程度更大。

3) PVB夹胶层对玻璃应力和挠度影响较小。当PVB夹胶层增加时，各层玻璃的应力和挠度随之增加，即抗弯性能有所下降，中片玻璃应力降幅最大。实际应用中，在满足承载力和构造条件的情况下，结合玻璃平整度，可以取最小PVB夹胶层厚度。

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