การคำนวณแรงลมของอาคารเตี้ยหลังคาทรงจั่วและโค้งโดยการทดสอบแบบจำลองในอุโมงค์ลม

นรวิชญ์ มั่นศิลป์; จิรวัฒน์ จันทร์เรือง; วิโรจน์ บุญญภิญโญ

Authors

นรวิชญ์ มั่นศิลป์ นักศึกษา, คณะวิศวกรรมศาสตร์ มหาวิทยาลัยธรรมศาสตร์, เลขที่ 99 หมู่ 18 ถ. พหลโยธิน ต. คลองหนึ่ง อ. คลองหลวง จ. ปทุมธานี 12120
จิรวัฒน์ จันทร์เรือง อาจารย์, คณะวิศวกรรมศาสตร์และสถาปัตยกรรมศาสตร์ มหาวิทยาลัยเทคโนโลยีราชมงคล ตะวันออก วิทยาเขตอุเทนถวาย, 225 ถ.พญาไท แขวงปทุมวัน เขตปทุมวัน กทม. 10330
วิโรจน์ บุญญภิญโญ อาจารย์, คณะวิศวกรรมศาสตร์ มหาวิทยาลัยธรรมศาสตร์, เลขที่ 99 หมู่ 18 ถ. พหลโยธิน ต. คลองหนึ่ง อ. คลองหลวง จ. ปทุมธานี 12120

Keywords:

wind load, low-rise buildings, wind tunnel test, wind load standards

Abstract

This study investigates the wind pressure distribution on low-rise buildings with gable roofs at 18.4^o and 26.7^o pitches, and a curved roof with an equivalent pitch of 18^o. Experimental tests were conducted using 1:80 scale models in a boundary layer wind tunnel to evaluate three aerodynamic characteristics: (1) local wind pressure coefficients, (2) surface-averaged wind pressure coefficients over each entire building face, and (3) area-averaged wind pressure coefficients corresponding to specific tributary zones on each face. A Voronoi approach was systematically employed to calculate the tributary areas. The findings reveal distinct differences in aerodynamic behavior between the gable and curved roof configurations. For gable roofs, the surface-averaged wind pressure coefficients generally align with the provisions of DPT 1311-50 and ASCE 7-22. However, within the critical zones of the 18.4^o gable roof, the DPT 1311-50 standard underestimates the design wind pressures for components and cladding (C&C) compared to the experimental results, whereas the ASCE 7-22 standard yields better agreement with the empirical data. Furthermore, this study contributes to the fundamental understanding of wind-induced pressures on curved roofs, addressing a significant gap in the DPT 1311-50 standard where provisions for such geometries are currently lacking.

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