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| Influence of air barrier leakage on pressure equalization of rainscreen walls |
| LI Huan-long, LOU Wen-juan |
| Institute of Structural Engineering, Zhejiang University, Hangzhou 310058, Chinav |
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Abstract Formulas of frequencydomain characteristic parameters for the pressure transfer of rainscreen walls with a leaky air barrier were deduced based on the frequencydomain analysis method for the pressure transfer of rainsreeen walls. And the influence of air barrier leakage on the pressure equalization was studied by bringing in the air barrier leakage model. When the air barrier transits from nonleaky to leaky behavior, the mean of the pressure drop across the rainscreen and its low frequency response change from equalization to noequalization, while its resonance response gets smaller. Within the four leakage parameters of the air barrier, the influences of the discharge coefficient and the effective length of leakage holes on the pressure equalization are neglectable, while the influences of the rate of air leakage through air barrier and the flow exponent of the leakage are remarkable. When the rate of air leakage or the flow exponent gets bigger, the pressure drop’s mean value and its low frequency response get bigger, while its resonance response gets smaller. The timedomain analysis of the original nonlinear control equations validated the applicability of the frequencydomain analysis method derived after the statistical linearization for solving this type of rainscreen walls’ pressure transfer.
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Published: 14 May 2010
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气屏渗漏对雨幕墙压力平衡的影响
基于雨幕墙压力传递的频域求解方法,推导当气屏有渗漏时雨幕墙压力传递频域特征参数的表达式,并结合气屏渗漏模型分析气屏渗漏对雨幕墙压力平衡的影响.计算结果表明,气屏从无渗漏到有渗漏,雨幕两侧压差的均值及低频脉动响应由平衡变为不平衡,但是脉动共振响应减小.气屏孔隙流量系数及气屏孔隙有效深度对压力平衡的影响很小,而气屏渗漏流量及气屏孔隙流动指数的影响较大.随着渗漏流量或流动指数增大,压差均值与低频脉动响应增大,而脉动共振响应减小.利用原非线性控制方程组的时域求解结果,验证了通过统计线性化得到的频域求解方法在此类雨幕墙压力传递求解上的适用性.
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