ᮾᛴᘓタᢏ⾡◊✲ᡤሗ No.41 25 1 1 4 100 1 ) / ( ) / ( u f m f m f m U U B B T T U.D.C 699.83
ᒇୖ┠㞃ࡋቨస⏝ࡍࡿࣆ࣮ࢡ㢼ຊಀᩘ㛵ࡍࡿ◊✲
ᮏ⏣ ᏹṊ
㸨ᰩ⏣ ๛
㸨ຍ⸨ ಙ⏨
㸨㸨 せ ⣙㸸 ᘓ≀ࡢᒇୖእ࿘㒊ࡣ, ᬒほୖࡢ㜼ᐖせᅉ࡞ࡿタഛᶵჾࡢ㟢ฟࢆ㜵ࡄࡶ, ࿘㎶ᆅ༊ࡢࢫ࢝ࣛࣥᙧᡂࢆ┠ⓗࡋ࡚ ┠㞃ࡋቨࢆタ⨨ࡍࡿࡇࡀከ࠸ࠋᒇୖ┠㞃ࡋቨస⏝ࡍࡿࣆ࣮ࢡ㢼ຊಀᩘࡘ࠸࡚ᗄࡘࡢ◊✲ࡀሗ࿌ࡉࢀ࡚࠸ࡿࡀ, ┠㞃ࡋ ቨࡢ㧗ࡉ᪉ྥ࣭ᖜ᪉ྥࡢࣆ࣮ࢡ㢼ຊಀᩘศᕸࡸᘓ≀➃㒊ࡽࢭࢵࢺࣂࢵࢡࡋࡓ⨨࠶ࡿ┠㞃ࡋቨࡢ㢼ຊ≉ᛶࡘ࠸࡚ࡣ᫂ࡽ ࡉࢀ࡚࠸࡞࠸ࠋࡑࡇ࡛ᮏ◊✲࡛ࡣ, ᘓ≀➃㒊ࡽࡢ㞳㝸㊥㞳ࢆࣃ࣓࣮ࣛࢱࡋࡓᒇୖ┠㞃ࡋቨࡢ㢼ᅽᐇ㦂ࢆ⾜࠸, ┠㞃ࡋቨ ࡢࣆ࣮ࢡ㢼ຊಀᩘศᕸ࠾ࡼࡧ㞳㝸㊥㞳ࣆ࣮ࢡ㢼ຊಀᩘࡢ㛵ಀࡘ࠸᳨࡚ウࡋࡓࠋࡑࡢ⤖ᯝ, 㞳㝸㊥㞳ࡀࡁࡃ࡞ࡿ┠㞃ࡋቨ స⏝ࡍࡿ᭱ࣆ࣮ࢡ㢼ຊಀᩘࡣࡁࡃ࡞ࡾ, ᭱ᑠࣆ࣮ࢡ㢼ຊಀᩘࡢ⤯ᑐ್ࡣᑠࡉࡃ࡞ࡿഴྥࡀぢࡽࢀࡓࠋ┠㞃ࡋቨࡢࣆ࣮ࢡ㢼 ຊಀᩘࡣ, ┠㞃ࡋቨ୰ኸ㒊࡛᭱࡞ࡾ, 㞳㝸ࡢ࡞࠸┠㞃ࡋቨ࡛ 3.5, 㞳㝸ࢆ᭷ࡍࡿ┠㞃ࡋቨ࡛ 3.6㹼3.9 ࡛࠶ࡗࡓࠋࡲࡓ, ᭱ᑠࣆ ࣮ࢡ㢼ຊಀᩘࡢ⤯ᑐ್ࡣ┠㞃ࡋቨ➃㒊࡛᭱ࡶࡁࡃ, 㞳㝸ࡢ࡞࠸┠㞃ࡋቨ࡛-2.9, 㞳㝸ࢆ᭷ࡍࡿ┠㞃ࡋቨ࡛-2.5㹼-2.2 ࡛࠶ࡗࡓࠋ 㺕㺎㺺㺎㺢㺼㸸 ᒇୖ┠㞃ࡋቨ, 㞳㝸㊥㞳, 㢼Ⲵ㔜, ࣆ࣮ࢡ㢼ຊಀᩘ, እᅽಀᩘ, 㢼Ὕᐇ㦂 ┠ ḟ㸸 ࡣࡌࡵ ᐇ㦂⤖ᯝ ᐇ㦂ᴫせ ࡲࡵ 㢼ຊಀᩘࡢホ౯ ࡣࡌࡵ ᘓ≀ࡢᒇୖእ࿘㒊ࡣ, ᬒほୖࡢ㜼ᐖせᅉ࡞ࡿタഛ ᶵჾ㢮ࡢ㟢ฟࢆ㜵ࡄࡶ, ࿘㎶ᆅ༊ࡢࢫ࢝ࣛࣥ ᙧᡂࢆ┠ⓗࡋ࡚, ┠㞃ࡋቨࢆタ⨨ࡍࡿࡇࡀከ࠸ࠋ ᒇୖ┠㞃ࡋቨస⏝ࡍࡿࣆ࣮ࢡ㢼ຊಀᩘࡣ, ⌧⾜ࡢᇶ つ‽ࡣ᫂♧ࡉࢀ࡚࠸࡞࠸ࠋᐇົ⪅ࡢࡓࡵࡢᘓ⠏≀እ ᮦ⪏㢼タィ࣐ࢽࣗࣝ1 ࡼࢀࡤ, 㧗ᒙᘓ⠏≀ࡢ┠㞃 ࡋቨࢆᑐ㇟ࡋࡓ㢼Ὕᐇ㦂⤖ᯝࡽࣆ࣮ࢡ㢼ຊಀᩘ 4 ⛬ ᗘࢆタィࡢ┠Ᏻࡋ࡚࠸ࡿࠋࡲࡓ, ୰ᒙࢫࣃࣥᘓ⠏≀ ࡢ┠㞃ࡋቨࢆᑐ㇟ࡋࡓ➉ࡽ2 ࡢ◊✲ࡸ㏻Ẽᛶࢆ᭷ࡍ ࡿ┠㞃ࡋࣃࢿࣝࡢࣆ࣮ࢡ㢼ຊಀᩘࢆồࡵࡓ┦ཎࡽ3 ࡢ◊ ✲࡞ࡶ࠶ࡾ, ㏆ᖺ┠㞃ࡋቨస⏝ࡍࡿࣆ࣮ࢡ㢼ຊಀᩘ ࡀᩚഛࡉࢀࡘࡘ࠶ࡿࠋࡋࡋ, ┠㞃ࡋቨࡢ㧗ࡉ᪉ྥ࣭ᖜ ᪉ྥࡢࣆ࣮ࢡ㢼ຊಀᩘศᕸࡸᘓ≀➃㒊ࡽࢭࢵࢺࣂࢵ ࢡࡋࡓ⨨࠶ࡿ┠㞃ࡋቨࡢ㢼ຊ≉ᛶࡘ࠸࡚ࡣ᫂ࡽ ࡉࢀ࡚࠸࡞࠸ࠋ ࡑࡇ࡛ᮏ◊✲࡛ࡣ, ᘓ≀➃㒊ࡽࡢ㞳㝸㊥㞳ࢆࣃ࣓ࣛ ࣮ࢱࡋࡓᒇୖ┠㞃ࡋቨࡢ㢼ᅽᐇ㦂ࢆ⾜࠸, ┠㞃ࡋቨࡢ ࣆ࣮ࢡ㢼ຊಀᩘศᕸ࠾ࡼࡧ㞳㝸㊥㞳ࣆ࣮ࢡ㢼ຊಀᩘ ࡢ㛵ಀࡘ࠸᳨࡚ウࡋࡓࠋ ᐇ㦂ᴫせ 㢼Ὕᐇ㦂ࡣ, ᮾᛴᘓタᢏ⾡◊✲ᡤࡢᅇὶᘧቃ⏺ᒙ㢼Ὕ ࡛⾜ࡗࡓࠋୗグᐇ㦂ᴫせࢆ♧ࡍࠋ ᐇ㦂ᶍᆺ ᅗ 1 ᶍᆺᴫせࢆ♧ࡍࠋᶍᆺࡢ⦰ᑻ⋡ࡣ 1/100 ࡋ, ᖜ࣭ዟ⾜ࡁ 150mm, 㧗ࡉ 450mm B:D:H=1:1:3 ࡢṇ᪉ᙧ ゅᰕᶍᆺୖ㒊㧗ࡉ 50mm h/H=1/9 , ཌࡉ 2mm ࡢ┠㞃 ࡋቨᶍᆺࢆタ⨨ࡋࡓࠋ┠㞃ࡋቨᶍᆺࡢ⾲㠃㠃ࡣ ࡑࢀࡒࢀ㢼ᅽ ᐃᏍࢆタࡅ࡚࠸ࡿࠋ⾲ 1 ᐇ㦂ࢣ࣮ࢫࢆ ♧ ࡍ ࠋ ┠ 㞃 ࡋ ቨ ࡢ 㞳 㝸 ㊥ 㞳 ࡣ , ᘓ ≀ ➃ 㒊 ࡼ ࡾ 0mm, 10mm, 25mm x/B=0, 0.07, 0.17 ࡢィ 3 ࢣ࣮ࢫࡋࡓࠋ ᐇ㦂Ẽὶ ᐇ㦂Ẽὶࡣ, ᘓ⠏≀Ⲵ㔜ᣦ㔪 4 ♧ࡉࢀ࡚࠸ࡿᆅ⾲㠃 ⢒ᗘ༊ศϪࢆ┠ᶆసᡂࡋࡓࠋᅗ 2 ᐇ㦂Ẽὶࡢᖹᆒ㢼 ㏿, ࢀࡢᙉࡉ࠾ࡼࡧኚື㢼㏿ࡢࣃ࣮࣡ࢫ࣌ࢡࢺࣝᐦᗘ ࢆ♧ࡍࠋ㢼Ὕᗋ㠃ࡽࡢ㧗ࡉ 450mm ⨨ ᒇ᰿㧗ࡉ H ࠾ࡅࡿᖹᆒ㢼㏿ࡣ 9.5m/s, ࢀࡢᙉࡉࡣ 18.8%࡛࠶ࡿࠋ 㢼Ὕᐇ㦂ࡢ┦ఝ๎ ๓㏙ࡢᶍᆺ⦰ᑻ⋡ࡼࡾ, ᘓ≀ࡢᒇ᰿㧗ࡉࡣᐇ≀⟬࡛ 45m࡞ࡿࠋ㧗ࡉ 45m ⨨࠾ࡅࡿタィ㢼㏿ࡣ, ᘓ⠏≀ Ⲵ㔜ᣦ㔪4 ᇶ࡙ࡁ 39.7m/s タィ⏝⌧ᮇ㛫 100 ᖺ, ᇶ ᮏ㢼㏿ 37m/s タᐃࡋࡓ 㢼㏿ࡢ⦰ᑻ⋡㸸1/4 ࠋ㛫ࡢ ⦰ᑻ⋡ Tm/Tfࡣ, 1 ᘧࡢ࠾ࡾᶍᆺࡢ⦰ᑻ⋡ Bm/Bf࠾ࡼ ࡧ㢼㏿ࡢ⦰ᑻ⋡ Um/Ufࡼࡾ 1/25 ࡞ࡿࠋ 1 ᐇ㦂᪉ἲ ᒇୖ┠㞃ࡋቨస⏝ࡍࡿ㢼ᅽࡣ, ┠㞃ࡋቨᶍᆺタࡅ ࡓ㢼ᅽ ᐃᏍࡽࣅࢽ࣮ࣝࢳ࣮ࣗࣈࢆ⏝࠸࡚㢼ᅽィ ᑟࡁ, ከⅬྠィ ࡋࡓࠋᐇ㦂㢼ྥș ࡣ, 0 ᗘࡽ 355 ᗘ ࡲ࡛ 5 ᗘࣆࢵࢳ࡛ィ 72 㢼ྥࡋࡓࠋ ࢹ࣮ࢱ㘓ࡣ, ࢧࣥࣉࣜࣥࢢ࿘Ἴᩘ 1kHz, 1 㢼ྥ࠶ࡓ ࡾࡢ㘓㛫ࢆ 132 ⛊ࡋࡓࠋୖ㏙ࡢ㛫ࡢ⦰ᑻ⋡ࡼࡾ, 1㢼ྥ࠶ࡓࡾᐇ㛫 3300 ⛊ 55 ศ㛫 ࡢࢹ࣮ࢱࡀᚓࡽࢀ ࡿࠋ࡞࠾, ᑟᅽࢳ࣮ࣗࣈࡼࡿ㢼ᅽࡢࡦࡎࡳࡣ, ணࡵ ᐃࡋࡓᛂ⟅≉ᛶࢆ⏝࠸࡚࿘Ἴᩘ㡿ᇦ࡛⿵ṇࡋࡓࠋ ᢏ⾡◊✲ᡤ ⇕࣭㢼ࢢ࣮ࣝࣉ ᘓ⠏ᮏ㒊ᢏ⾡⟶⌮㒊ᢏ⾡⟶⌮➨ࢢ࣮ࣝࣉ * 技術研究所 温熱・風グループ ** 建築本部 技術管理部 技術管理第二グループ U.D.C 699.83屋上目隠し壁に作用するピーク風力係数に関する研究
本田 宏武
＊栗田 剛
＊加藤 信男
＊＊ 61 東急建設技術研究所報No.41 東急建設技術研究所報No.41pr pe H r e f C C q P P C » ¼ º « ¬ ª ' U n k n G n G n G n Coh exp ) ( ) ( ) ( ) ( 2 1 12 ) (n Coh sec 6 . 0 4 . 0 7 . 39 ) 3 2 ( 8 㹼 㹼 u H a U kL T ᅗ ᶍᆺᴫせ࠾ࡼࡧ㢼ྥゅࡢᐃ⩏ ᅗ ᐇ㦂Ẽὶ D ᖹᆒ㢼㏿࣭ࢀࡢᙉࡉ E ኚື㢼㏿ࡢ PSD ᅗ ኚື㢼ຊࡢ࣮ࣝࢺࢥࣄ࣮ࣞࣥࢫ ᐃⅬ BC 㛫, 㢼ྥゅ 275 ᗘ ⾲ ᐇ㦂ࢣ࣮ࢫ a Case1 B A C B A C b Case2 B A C c Case3 d 㢼ྥゅ ș 0ᗘ 0.01 0.1 1 0.01 0.1 1 10 nSu (n ) /Ȫ 2 nL H㻌/UH ᐇ㦂್ ᣦ㔪್ Karmanᆺ 10 100 1000 0.1 1 10 㢼 Ὕ ᗋ 㠃ࡽ ࡢ㧗 ࡉ Z mm ۂᒇ᰿㧗ࡉH ۑUZ㻌㻔ᐇ㦂್ ڹIZ㻌㻔ᐇ㦂್ IZ㻌 ᣦ㔪್ U Z m/s 㻌, IZ UZ㻌㻔ᣦ㔪್ 20 0 0.2 0.4 0.6 0.8 1 0 0.05 0.1 0.15 0.2 0.25 0.3 Roo t Coh e re n ce nԥ/U ۑCase1 exp -8nԥ/U ۑCase2 ۑCase3 x mm x /B 1 150 50 150 0 0 2 150 50 130 10 0.07 3 150 50 100 25 0.17 Case ᘓ≀ᖜ B mm ┠㞃ࡋቨ 㧗ࡉ h mm ᖜ b mm 㞳㝸㊥㞳 㢼ຊಀᩘࡢホ౯ ┠㞃ࡋቨࡢ㢼ຊಀᩘ Cfࡢᐃ⩏ࢆ 2 ᘧ♧ࡍࠋ㢼ຊಀ ᩘࡣ, ┠㞃ࡋቨ⾲㠃ࡢእᅽ Pe㠃ࡢእᅽ Prࡢᕪᅽࢆ ồࡵ, ᒇ᰿㧗ࡉ H ࠾ࡅࡿ㏿ᗘᅽ qH࡛↓ḟඖࡋࡓࠋ 2 ࡇࡇ, ᐇ㦂⤖ᯝ ࣆ࣮ࢡ㢼ຊಀᩘࡢホ౯᪉ἲ ᅗ 3 ᐃⅬ BC 㛫ࡢኚື㢼ຊࡢ࣮ࣝࢺࢥࣄ࣮ࣞࣥ ࢫࢆ♧ࡍࠋᶓ㍈ࡣ↓ḟඖ࿘Ἴᩘࢆ♧ࡋ, n ࡣ࿘Ἴᩘ, Ǽ ࡣ BC 㛫ࡢ㊥㞳 40mm , U ࡣᒇ᰿㧗ࡉ H ࠾ࡅࡿᐇ㦂 㢼㏿ 9.5m/s ࡛࠶ࡿࠋྠᅗ୰, 3 ᘧ࡛♧ࡍࢹࢣࣇ ࢡࢱ࣮k=8 ࡋࡓ㏆ఝ⥺ࢆేグࡍࡿࠋ 3 ࡇࡇ, 2Ⅼ㛫ࡢ┦㛵ࡣ Case1, 2, 3 ࡢ㡰㧗ࡃ, k ್ࡣᴫࡡ 8 ⛬ ᗘ࡛࠶ࡿࠋࡇࢀࡣ, ᘓ⠏≀Ⲵ㔜ᣦ㔪 1993 4 グࡉࢀ࡚ ࠸ࡿ┠Ᏻ್୍⮴ࡍࡿࠋࡇࡇ࡛, እᮦࡢ௦⾲㛗ࡉ L ࢆ 2㹼3m ⛬ᗘ௬ᐃࡍࡿ, 4 ᘧ♧ࡍ TVL ἲ5 ࡼࡾ, 0.4㹼0.6 ⛊ࡢᖹᆒ㛫 Taࢆᚓࡿࠋᮏ᳨ウ࡛ࡣ, ⌧⾜ࡢ ᘓ⠏≀Ⲵ㔜ᣦ㔪ࡸᘓタ┬࿌♧➨ 1458 ྕ6 ♧ࡉࢀ࡚࠸ ࡿࣆ࣮ࢡእᅽಀᩘࡢᖹᆒ㛫ࡀ 0.5㹼1.0 ⛊࡛࠶ࡿࡇ ࡶ㋃ࡲ࠼, ᐇ㦂࡛ᚓࡽࢀࡓ้Ṕࢹ࣮ࢱᐇ㛫 0.5 ⛊ ࡢ⛣ືᖹᆒࢆࡋ, ホ౯㛫 600 ⛊┦ᙜࡍࡿ 5 ⤌ࡢ ࣥࢧࣥࣈࣝᖹᆒࡼࡾࣆ࣮ࢡ㢼ຊಀᩘࢆホ౯ࡋࡓࠋ 4 ࡇࡇ, ࣭᭱᭱ᑠࣆ࣮ࢡ㢼ຊಀᩘ ᅗ 4 ྛ ᐃⅬࡢ࣭᭱᭱ᑠࣆ࣮ࢡ㢼ຊಀᩘ 㢼ྥ ୰ࡢ್᭱᭱ᑠ್ ࢆ♧ࡍࠋࣆ࣮ࢡ㢼ຊಀᩘࡢ➢ྕࡣ, ┠㞃ࡋቨࢆእഃࡽෆഃᢲࡍ᪉ྥࢆṇ + , ෆഃࡽ እഃྥࡗ࡚ᢲࡍ᪉ྥࢆ㈇ ᐃ⩏ࡋࡓࠋ᭱ࣆ࣮ ࢡ㢼ຊಀᩘ Cfmaxࡢ㧗ࡉ᪉ྥࡢศᕸࡣ, 㞳㝸ࡢ࡞࠸ Case1 ࡢሙྜ, ┠㞃ࡋቨୗẁ್ࡀࡁࡃ, 㞳㝸ࢆ᭷ࡍࡿ Case2 x/B=0.07 ࡸ Case3 x/B=0.17 ࡛ࡣ୰ẁ್ࡀ ࡁࡃ࡞ࡿഴྥ࠶ࡿࠋCase1 ࡢ᭱ࣆ࣮ࢡ㢼ຊಀᩘ Cfmaxࡣ, ┠㞃ࡋቨ୰ኸୗẁࡢ ᐃⅬ࡛᭱ࡶࡁࡃ 3.5 , Case2 ࠾ࡼࡧ Case3 ࡛ࡣ୰ኸ ᐃⅬ࡛᭱࡞ࡗࡓ Case2㸸3.6, Case3㸸3.9 ࠋࡲࡓ, ᭱ᑠࣆ࣮ࢡ㢼ຊಀᩘ Cfminࡢ⤯ᑐ್ࡣ࠸ࡎࢀࡢࢣ࣮ࢫࡶ┠㞃ࡋቨୖ➃ ᐃⅬ
࡛᭱࡞ࡗࡓ Case1㸸-2.9, Case2㸸2.5, Case3㸸2.2 ࠋ 㸸࣮ࣝࢺࢥࣄ࣮ࣞࣥࢫ G12 n 㸸ࢡࣟࢫࢫ࣌ࢡࢺࣝᐦᗘ G1 n , G2 n 㸸ࣃ࣮࣡ࢫ࣌ࢡࢺࣝᐦᗘ Cpe㸸┠㞃ࡋቨ⾲㠃ࡢእᅽಀᩘ Cpr㸸┠㞃ࡋቨ㠃ࡢእᅽಀᩘ UH㸸タィ㢼㏿ =39.7m/s 東急建設技術研究所報No.41 62
ࣆ࣮ࢡ㢼ຊಀᩘࡢ㢼ྥゅࡼࡿኚ ᅗ 5 ࣆ࣮ࢡ㢼ຊಀᩘࡢ⤯ᑐ್ࡀ᭱࡞ࡗࡓ┠㞃ࡋ ቨ୰ኸ ᐃⅬ A ୖ➃ ᐃⅬ B ࠾ࡅࡿࣆ࣮ࢡ㢼ຊಀ ᩘࡢ㢼ྥゅࡼࡿኚࢆ♧ࡍࠋ a ♧ࡍ᭱ࣆ࣮ࢡ㢼 ຊಀᩘ Cfmaxࡣ┠㞃ࡋቨࡀ㢼ṇᑐࡍࡿ㢼ྥゅ 0 ᗘ࡛᭱ ࡞ࡗࡓࠋࡲࡓ, b ♧ࡍ᭱ᑠࣆ࣮ࢡ㢼ຊಀᩘ Cfmin ࡢ⤯ᑐ್ࡀ᭱࡞ࡿ㢼ྥࡣ, Case1 ࡛ 275 ᗘ, Case2 ࠾ ࡼࡧ Case 3 ࡣ 135 ᗘ࡛࠶ࡗࡓࠋ ┠㞃ࡋቨ⾲㠃ࡢእᅽಀᩘ ᅗ 6 ᐃⅬ A B ࠾ࡅࡿእᅽಀᩘࡢ㢼ྥゅࡼ ࡿኚࢆ♧ࡍࠋᅗ୰ࡢ⾲㠃እᅽಀᩘ Cpe㠃እᅽಀᩘ Cpr ࡣ, ࣆ࣮ࢡ㢼ຊࡀⓎ⏕ࡋࡓ้ࡢ್ࡋ࡚࠸ࡿࡓࡵ, ྛࢣ࣮ࢫࡢ Cpe Cprࡢᕪࡣᅗ 5 ୍⮴ࡍࡿࠋᅗ 7㹼9 㢼ྥゅ 135 ᗘ࠾ࡅࡿ Case1㹼Case3 ࡢእᅽಀᩘ Cpe, Cpr ᭱ᑠࣆ࣮ࢡ㢼ຊಀᩘ Cfminࡢศᕸࢆ♧ࡍࠋᮏᅗࡣ, ᶍ ᆺࡢᑐ㇟ᛶࢆ⪃៖ࡋ࡚ ᐃⅬࢆ᭷ࡉ࡞࠸ 3 ቨ㠃ࡘ࠸࡚ ࡶᒎ㛤ࡋ࡚♧ࡋ, ㉥▮༳ࡣ┠㞃ࡋቨࡢ⾲㠃࠾ࡼࡧ㠃ࢆ ᢲࡍ᪉ྥస⏝ࡍࡿຊࢆ, 㟷▮༳ࡣᘬࡗᙇࡿ᪉ྥస⏝ ࡍࡿຊ Cfminࡢሙྜࡣ, ┠㞃ࡋቨࢆෆഃࡽእഃྥ ࡗ࡚ᢲࡍຊ ࢆ⾲ࡋ࡚࠸ࡿࠋ a ࡢ⾲㠃እᅽಀᩘ Cpe b ࡢ㠃እᅽಀᩘ Cpr ࡢᕪᅽ ࣋ࢡࢺࣝ ࢆࡿ, c ♧ࡍ᭱ᑠࣆ࣮ࢡ㢼ຊಀᩘ Cfminࡢศᕸࡀᚓࡽࢀࡿࠋ ᅗ 6 a ࡢ㢼ྥゅ 0 ᗘࡢ್╔┠ࡍࡿ, Cpeࡣ Case1㹼 3࡛ࡁ࡞ኚࡣぢࡽࢀ࡞࠸ࡀ, Cprࡢ⤯ᑐ್ࡣ Case1, 2, 3ࡢ㡰ࡁࡃ࡞ࡗ࡚࠸ࡿࠋᑐ⛠㠃࡛࠶ࡿ㢼ྥゅ 180 ᗘ ࡘ࠸࡚ࡶྠᵝࡢഴྥࡀぢࡽࢀࡿࠋࡇࢀࡣ, ┠㞃ࡋቨࡀ ࢭࢵࢺࣂࢵࢡࡋ࡚࠸ࡿࡇ࡛┠㞃ࡋቨୖ㒊ࢆࡾ㉺࠼ ࡿὶࢀࡀᙉࡃ࡞ࡾ, 㠃ࡁ࡞㈇ᅽࡀ⏕ࡌࡓࡓࡵ⪃ ࠼ࡽࢀࡿࠋᅗ 6 b ࡢ㢼ྥゅ 135 ᗘ࡛ࡣ, Cpeࡁ࡞ኚ ࡣぢࡽࢀ࡞࠸ࡶࡢࡢ, Cprࡣ Case3, 2, 1 ࡢ㡰್ࡀࡁ ࡃ࡞ࡗ࡚࠸ࡿࠋࡇࢀࡣ, ᅗ 7㹼9 b ♧ࡍ࠾ࡾ㞳㝸ࡢ ࡞࠸┠㞃ࡋቨ┠㞃ࡋቨෆ㒊㢼ࡀὶࢀࡇࡳࡸࡍࡃ ࡞ࡾ, ᑐゅ⥺ୖ࠶ࡿ┠㞃ࡋቨࢆෆഃࡽᙉࡃᢲࡋ࡚࠸ ࡿࡓࡵ⪃࠼ࡽࢀࡿࠋࡲࡓ, 㢼ྥゅ 275 ᗘ㏆࠾࠸࡚, Case1ࡢࢣ࣮ࢫ࡛ࡣ Cpe㢧ⴭ࡞ᕪࡀぢࡽࢀࡿࠋᘓ ≀➃㒊ࡽ㞳㝸ࢆ᭷ࡍࡿ┠㞃ࡋቨ Case2, 3 ࡢሙྜ, 㞳 㝸ࡢ࡞࠸┠㞃ࡋቨ Case1 ẚ࡚➃㒊ࢆ㞳ࡍࡿὶࢀ ࡀᙅࡲࡗࡓࡶࡢ᥎ᐹࡉࢀࡿࠋ ᅗ ࣆ࣮ࢡ㢼ຊಀᩘࡢ㢼ྥゅࡼࡿኚ D ᭱ࣆ࣮ࢡ㢼ຊಀᩘ A Ⅼ E ᭱ᑠࣆ࣮ࢡ㢼ຊಀᩘ B Ⅼ D ᭱ࣆ࣮ࢡ㢼ຊಀᩘⓎ⏕ࡢእᅽಀᩘ A Ⅼ E ᭱ᑠࣆ࣮ࢡ㢼ຊಀᩘⓎ⏕ࡢእᅽಀᩘ B Ⅼ ᅗ ┠㞃ࡋቨ⾲㠃እᅽಀᩘࡢ㢼ྥゅࡼࡿኚ 0 1 2 3 4 0 45 90 135 180 225 270 315 360 C f m a x ەCase1 ەCase2 ەCase3 ȟ deg -3 -2 -1 0 1 0 45 90 135 180 225 270 315 360 C f m in ڸCase1 ڸCase2 ڸCase3 ȟ deg -2 -1 0 1 2 3 0 45 90 135 180 225 270 315 360 ȟ deg
Case1_Cpe Case2_Cpe Case3_Cpe Case1_Cpr Case2_Cpr Case3_Cpr
Cp e, C p r -4 -3 -2 -1 0 1 2 0 45 90 135 180 225 270 315 360 Cp e, C p r
Case1_Cpe Case2_Cpe Case3_Cpe Case1_Cpr Case2_Cpr Case3_Cpr
ȟ deg ᅗ ᒇୖ┠㞃ࡋቨࡢ࣭᭱᭱ᑠࣆ࣮ࢡ㢼ຊಀᩘ 㢼ྥ୰ࡢ್᭱᭱ᑠ್ 2.7 3.0 3.0 2.7 3.1 3.2 2.7 3.3 3.4 2.6 3.4 3.5 2.7 3.3 3.4 2.8 3.2 3.3 2.7 3.0 3.0 -2.7 -2.9 -2.4 -2.2 -2.8 -2.4 -2.0 -1.7 -2.1 -1.8 -1.1 -1.4 -2.0 -1.7 -2.2 -2.2 -2.9 -2.3 -2.9 -2.9 -2.5
D Case1 ್᭱ E Case2 ್᭱
G Case1 ᭱ᑠ್ H Case2 ᭱ᑠ್ 2.9 3.4 2.9 3.0 3.8 2.9 3.0 3.9 2.9 3.0 3.9 3.0 2.9 3.5 2.8 -2.1 -1.5 -2.1 -1.7 -1.4 -1.3 -1.5 -0.9 -0.8 -1.7 -1.4 -1.3 -2.2 -1.6 -2.1 F Case3 ್᭱ I Case3 ᭱ᑠ್ 東急建設技術研究所報No.41 63
┠㞃ࡋቨࡢ㞳㝸㊥㞳㒊ูࣆ࣮ࢡ㢼ຊಀᩘ ᅗ 10 ┠㞃ࡋቨࡢ㞳㝸㊥㞳 x/B 㒊ูࡢࣆ࣮ࢡ㢼 ຊಀᩘࢆ♧ࡍࠋ㒊ศࡅࡣ┠㞃ࡋቨ➃㒊ࡽᘓ≀ᖜࡢ 10% 0.1B ࡢ⠊ᅖࢆ➃㒊, ࡑࢀ௨እࡢ㡿ᇦࢆ୰ኸ㒊ᐃ ⩏ࡋࡓࠋ๓㏙ࡢ࠾ࡾ, ┠㞃ࡋቨࡢ᭱ࣆ࣮ࢡ㢼ຊಀᩘ ࡣ x/B ࡢቑຍకࡗ࡚ࡁࡃ࡞ࡿࡀ, ᭱ᑠࣆ࣮ࢡ㢼ຊಀ ᩘࡢ⤯ᑐ್ࡣ㏫ᑠࡉࡃ࡞ࡿࠋ⾲ 2 ࣆ࣮ࢡ㢼ຊಀᩘࡢ ࡲࡵࢆ♧ࡍࠋ᪤ ࡢᩥ⊩1 グࡉࢀ࡚࠸ࡿᒇୖ┠㞃ࡋ ቨࢆタィࡍࡿ㝿⏝࠸ࡿࣆ࣮ࢡ㢼ຊಀᩘࡢ┠Ᏻ್ s 4.0 ᮏᐇ㦂⤖ᯝࢆẚ㍑ࡍࡿ, ್᭱㛵ࡋ࡚ࡣྠ⛬ ᗘ, ᭱ᑠ್ࡣᏳഃࡢ್࡛࠶ࡗࡓࠋ ࡲࡵ ᘓ≀➃㒊ࡽ㞳㝸ࢆ᭷ࡍࡿᒇୖ┠㞃ࡋቨస⏝ࡍࡿ ࣆ࣮ࢡ㢼ຊಀᩘศᕸ࠾ࡼࡧ㞳㝸㊥㞳ࣆ࣮ࢡ㢼ຊಀᩘ ࡢ㛵ಀࡘ࠸᳨࡚ウࡋࡓࠋ௨ୗࡲࡵࢆ♧ࡍࠋ ձ┠㞃ࡋቨࡢ㞳㝸㊥㞳ࡀࡁࡃ࡞ࡿ, ᭱ࣆ࣮ࢡ㢼 ຊಀᩘࡣࡁࡃ࡞ࡿࡀ, ᭱ᑠࣆ࣮ࢡ㢼ຊಀᩘࡢ⤯ᑐ ್ࡣᑠࡉࡃ࡞ࡿഴྥࡀぢࡽࢀࡓࠋ ղ┠㞃ࡋቨࡢࣆ࣮ࢡ㢼ຊಀᩘࡣ, ┠㞃ࡋቨ୰ኸ㒊࡛᭱ ࡞ࡾ, 㞳㝸ࡢ࡞࠸┠㞃ࡋቨ࡛ 3.5, 㞳㝸ࢆ᭷ࡍࡿ ┠㞃ࡋቨ࡛ 3.6 x/B=0.07 㹼3.9 x/B=0.17 ࡛࠶ࡗࡓࠋ ᭱ᑠࣆ࣮ࢡ㢼ຊಀᩘࡢ⤯ᑐ್ࡣ┠㞃ࡋቨ➃㒊࡛᭱ࡶ ࡁࡃ, 㞳㝸ࡢ࡞࠸┠㞃ࡋቨ࡛-2.9, 㞳㝸ࢆ᭷ࡍࡿ┠ 㞃ࡋቨ࡛-2.5 x/B=0.07 㹼-2.2 x/B=0.17 ࡛࠶ࡗࡓࠋ ཧ⪃ᩥ⊩ 1 ᪥ᮏᘓ⠏Ꮫ㸸ᐇົ⪅ࡢࡓࡵࡢᘓ⠏≀እᮦ⪏㢼タィ࣐ࢽࣗࣝ, 2013 2 ➉ኵ㸸つᶍᘓ≀ࡢᒇ᰿እᮦ⏝ࣆ࣮ࢡእᅽ࣭㢼ຊಀᩘ㛵ࡍࡿ◊✲, ᪥ᮏᘓ⠏ᏛᏛ⾡ㅮ₇᱾ᴫ㞟, pp.217-218, 2008 3 ┦ཎ▱Ꮚ࣭᳜ᯇᗣ㸸㏻Ẽᛶࡢ࠶ࡿᒇୖ┠㞃ࡋࣃࢿࣝస⏝ࡍࡿእᮦ⏝㢼Ⲵ㔜ࡢ᳨ウ, 㢼ᕤᏛࢩ࣏ࣥࢪ࣒࢘ㄽᩥ㞟, pp.391-396, 2014 4 ᪥ᮏᘓ⠏Ꮫ㸸ᘓ⠏≀Ⲵ㔜ᣦ㔪࣭ྠゎㄝ, 2015, 1993
5 T.V.Lawson㸸Wind Effects on Buildings Vol.1 Design Applications, 1980 6 㟘ࣨ㛵ฟ∧♫㸸ᖹᡂ 20 ᖺ∧ᇶᮏᘓ⠏㛵ಀἲ௧㞟>࿌♧⦅@, 2008
7 ᮏ⏣ᏹṊ࣭ᰩ⏣๛ 2 ྡ㸸ᒇୖ┠㞃ࡋቨస⏝ࡍࡿࣆ࣮ࢡ㢼ຊಀᩘ, ᪥ᮏᘓ⠏ᏛᏛ⾡ㅮ₇᱾ᴫ㞟, pp.185-186, 2015
A STUDY OF PEAK WIND FORCE COEFFICIENTS FOR SCREEN STANDING ON ROOFTOP
H.Honda, T.Kurita, and N.Katou
This paper describes peak wind force coefficients for screen standing on rooftop. The blindfold screen is often attached to the outside perimeter of building. However, distribution of wind force coefficients on screen stood away from the building edge has not been clarified. In this study, wind tunnel tests were performed to investigate relationship between separation distance and wind force coefficients for screen standing on rooftop. As a result, we observed tendency for the maximum peak wind force coefficient increase with increasing separation distance, and absolute value of the minimum peak wind force coefficient decrease with increasing separation distance. It was obtained that the maximum peak wind force coefficient is 3.5 to 3.9, and its minimum value is -2.2 to -2.9.
a Cpe b Cpr c Cfmin a Cpe b Cpr c Cfmin Cpe, Cpr, Cfmin=1.0 ᅗ Case2 ࡢእᅽಀᩘ࣭ࣆ࣮ࢡ㢼ຊಀᩘศᕸ ș=135 ᗘ ᅗ Case1 ࡢእᅽಀᩘ࣭ࣆ࣮ࢡ㢼ຊಀᩘศᕸ ș=135 ᗘ 㸩 㸻 㸩 㸻 ᅗ Case3 ࡢእᅽಀᩘ࣭ࣆ࣮ࢡ㢼ຊಀᩘศᕸ ș=135 ᗘ a Cpe b Cpr c Cfmin 㸩 㸻 a ୰ኸ㒊 E ➃㒊 ᅗ ┠㞃ࡋቨࡢ㞳㝸㊥㞳㒊ูࣆ࣮ࢡ㢼ຊಀᩘ -4 -2 0 2 4 0 0.05 0.1 0.15 0.2 x / B ە᭱ڸ᭱ᑠ C f m in , C f m a x -4 -2 0 2 4 0 0.05 0.1 0.15 0.2 x / B ڹ᭱ᑠ ۑ᭱ C f m in , C f m a x ⾲ ᮏᐇ㦂࡛ᚓࡽࢀࡓ㒊ูࣆ࣮ࢡ㢼ຊಀᩘ 0 0.07 0.17 ᭱ 3.3 3.1 3.5 ᭱ᑠ -2.9 -2.5 -2.2 ᭱ 3.5 3.6 3.9 ᭱ᑠ -2.2 -1.9 -1.7 㒊 ᪉ྥ 㞳㝸㊥㞳x /B ➃㒊 ୰ኸ㒊 東急建設技術研究所報No.41 64
