bilimsel ti simule edilmemektedir. Üniform statik basınç deneyleri, uygulama açısından en basit yöntem olması nedeniyle tercih edilmektedir. Devirli statik basınç deneyinde ise duvarın dış ve iç yüzeyleri arasındaki basınç farkı ve basınç farkının zamansal değişimi basit bir şekilde simule edilmektedir. Yöntemde, basınç gradyanı ile zamansal değişimi ve suyun tüm yönlere doğru hareketi simule edilmemektedir. Devirlibasınç deneylerini tanımlayan standartlar incelendiğinde (Şekil 6), standartların rüzgarın zamansal değişimini simule eden devir konusunu farklı şekillerde yorumladıkları görülmektedir. Rüzgarın zamansal değişimi saniye ile ifade edilir. NT BUILT421 ve AS/NZS 4284 standartlarında her devir saniye süresince uygulanmakta iken (dakikada 20 devir 0.33 Hz) CSA A 440.1 ve ASTM E 54 7 standartlarında verilen devirlerin her biri 5 dk süre ile uygulanmaktadır. Dinamik basınç deneyinde ise rüzgarın tüm etkileri, diğer bir anlabmla basınç farkı, basınç gradyanı ve bunların zamansal değişimi ile suyun tüm yönlere doğru hareketi simule edilmeye çalışılmaktadır. Standartlarda tanımlanan performans kriterleri incelendiğinde, tüm standartlar dış kaplamadan suyun geçmesi ve geçen suyun dışarı atılmaması durumunda duvarı su geçirimli olarak kabul etmektedirler. KAYNAKLAR [1) Carll C. Rainwater intrusion in light-frame building walls. 2nd Annual Conference on Durability and Disaster Mitigation in WoodFrame Housing, Forest Products Society, Madison, WI, USA, 2001, p. 33-40. [2) Killip IR, Cheetham DW. The prevention of rain penetration through external walls and joints by means of pressure equalization. Building and Environment 1984; 19(2):81-91. [3) Building Envelope Engineering Lnc. Wall moisture problems in Alberta dwellings. Canada Mortgage and Housing Corporation; 1999. [4) Canada Mortgage and Housing Corporation. Comparative analysis of residential construction in Seattle, 9 4 YALITIM • NiSAN 2005 Washington and Vancouver British Columbia. Building Envelope Research Consortium and Canada Mortgage and Housing Corporation; 1999. [5) Straube J, Burnett FP. Rain control and design strategies. Journal of Thermal Envelope and Building Science 1999; 23: 41-56. [6) Scott DL. Rain leakage in wood frame walls: two case histories. Building Research Note 210, Division of Building Research, National Research Council Canada; 1984, (BRN-210). [7) Morrison Hershfıeld Limited. Survey of building envelope failures in the coastal climate of British Columbia. Canada Mortgage and Housing Corporation; 1996. [8) Maref W, Lacasse MA, Booth DG. An approach to validating computational models far hygrothermal analysis-full scale experiments. Proceedings of the 3rd International Conference on Computational Heat and Mass Transfer, 2003: 243-251. [9) Saha! AN, Lacasse MA. Experimental assessment of water penetration and entry into siding-clad wall specimen. lnternal Report, lnstitute far Research in Construction, National Research Council Canada, 862; 2004, (IRC-IR-862). [10) Saha! AN, Lacasse MA.Water penetration of wall cladding-overview of climatic parameters, related test standards, and test and research facilities. Internal Report, lnstitute far Research in Construction, National Research Council Canada, 863; 2004, (IRC-IR-863). [11) Beard KV. Terminal velocity and shape of cloud and precipitation drops alofl J. of the Atrnospheric Sciences. 1976; 33, 851-864. [121 Kragh MK. Microclimatic conditions at the external surface of the building envelopes, Ph.D. thesis, Technical University of Denmark, Departrnent of Buildings and Energy, Report R-027, 1998. [131 Straube J. Rain, Driving Rain and Rain Control -Seminar Power Point presentation. [14) Choi ECC. Parameters affecting the intensity of wind-driven rain on the front face ofa building. Journal of Wind Engineering and Industrial Aerodynamics, 1994; 53: 1-17. [15) Best AC. The size distribution of raindrops. Quarterly Journal of the Royal Meteorological Society 1950; 76: 16-36 [161 AAMA501:1994. Methods of test far exterior walls. American Architectural Manufacturers Association, USA. [171 AS/NZS 4284:1995. Testing of building facades. Standards Australia & Standards New Zealand. [18) SS 381, 1996: Materials and perfarmance tests far aluminum curtain walls, Singapore Standard, Singapore. [19] CWCT: 1996. Standard and good practice for curtain walling - standard test method for watertightness using static pressure. Centre far Window and Cladding Technology, UK. [20) ASTM E 331:2000. Standard test method for water penetration of exterior windows, skylights, doors and curtain walls by uni form static air pressure difference. American Society far Testing and Materials, USA. [21) BS EN 12155:2000. Curtain walling-watertightness-laboratory test under static pressure. British Standard, UK. [22) NORDTEST STANDARDNT BUILD 421:1993. Roofs: watertightness under pulsating air pressure. [23) CSA STANDARDA440.l:1998. Windows-user selection guide to CSA standard-A440-98, windows. Canadian Standards Association, Canada. [24) ASTM E 547: 2000. Standard test method far water penetration of exterior windows, skylights, doors and curtain walls by cyclic static air pressure difference. American Society far Testing and Materials, USA. [25) DO ENV 13050:2001, Curtain walling-watertightness-laboratory test under dynamic conditions of air pressure and water spray. Draft Standard. [26) ASTM E 1105: 2000. Standard test method for fıeld determination of water penetration of installed exterior windows, skylights, doors and curtain walls by unifarm or cyclic static air pressure difference. American Society far Testing and Materials, USA. [271 Mayo AP. To develop a European standard dynamic watertightness test far curtain walling, Task 3-Defıne the conditions to be produced in the standard tesl Building Research Establishment, 1998. [281 Ritchie T, Plewes WG. Preliminary tests of the rain resistance of brickwork panels. lnternal report no. 108. Division of Building Research. National Research Council Canada, 1956. [29) Ritchie T, Plewes WG. Moisture penetration of brick masonry panels. Research paper no. ll8. Division of Building Research. National Research Council Canada, 1961. [30) Roberts, J. J., 1980. Rain penetration problems with concrete blockwork. Chemistry and Industry. 194-197. [311 Selvarajah S, Johnston AJ. Water permeation through cracked single skin masonry. Building and Environmenl 1997; 30 (1): 19-28. [321 St-Hilaire AT, Derome D, Fazio P. Approach far the simulation of wetting due to rain infıltration far building envelope testing, Proceedings of the Ninth Canadian Conference on Building Science and Technology, National Building Envelope Council (NBEC) Canada, Vancouver, British Columbia Canada; 2003: 459-474. [331 Saha! AN, Lacasse MA. Water entry function of a hardboard siding-clad wood stud wall. Building and Environmenl Article in Press. (http://authors.elsevier.com/sd/ article/S0360132304003403) [34) Surry D, Skerlj P., Mikitiuk MJ. An exploratory study of the climatic relati onships between rain and wind. Final Report BWLT-SS22-1994, Faculty of Engineering Science, University of Western Ontario, Landon, 1994. a
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