{"id":10840,"date":"2023-10-31T03:58:47","date_gmt":"2020-12-01T04:32:56","guid":{"rendered":"http:\/\/localhost\/xaydungnhadat\/?p=10840"},"modified":"2022-09-17T03:41:54","modified_gmt":"2022-09-17T03:41:54","slug":"huong-dan-cach-chon-kich-thuoc-mong-bang-so-bo","status":"publish","type":"post","link":"https:\/\/xaydungnhandat.com.vn\/?p=10840","title":{"rendered":"H\u01b0\u1edbng D\u1eabn C\u00e1ch Ch\u1ecdn K\u00edch Th\u01b0\u1edbc M\u00f3ng B\u0103ng S\u01a1 B\u1ed9"},"content":{"rendered":"
B\u00e0i vi\u1ebft sau \u0111\u00e2y c\u00f4ng ty thi\u1ebft k\u1ebf x\u00e2y d\u1ef1ng uy t\u00edn<\/strong> X\u00e2y D\u1ef1ng Nh\u00e2n \u0110\u1ea1t s\u1ebd h\u01b0\u1edbng d\u1eabn b\u1ea1n c\u00e1ch ch\u1ecdn k\u00edch th\u01b0\u1edbc m\u00f3ng b\u0103ng<\/strong> s\u01a1 b\u1ed9 b\u1eb1ng nh\u1eefng c\u00f4ng th\u1ee9c h\u1ebft s\u1ee9c \u0111\u01a1n gi\u1ea3n.<\/div>\n

C\u00e1ch ch\u1ecdn k\u00edch th\u01b0\u1edbc m\u00f3ng b\u0103ng s\u01a1 b\u1ed9<\/h2>\n
\n

M\u00f3ng n\u00f4ng n\u00f3i chung & m\u00f3ng b\u0103ng n\u00f3i ri\u00eang c\u1ea7m b\u1ea3o \u0111\u1ea3m \u0111i\u1ec1u ki\u1ec7n \u00e1p l\u1ef1c l\u00ean n\u1ec1n \u0111\u1ea5t nh\u1ecf h\u01a1n c\u01b0\u1eddng \u0111\u1ed9 n\u1ec1n \u0111\u1ea5t (hay s\u1ee9c ch\u1ecbu l\u1ef1c t\u1ea3i c\u1ee7a n\u1ec1n \u0111\u1ea5t)<\/p>\n

\"C\u00e1ch
B\u1ea3n v\u1ebd di\u1ec7n t\u00edch m\u00f3ng<\/figcaption><\/figure>\n

\u03c3 \u2264 [R]<\/strong><\/p>\n

Trong \u0111\u00f3:<\/p>\n[R] l\u00e0 c\u01b0\u1eddng \u0111\u1ed9 c\u1ee7a n\u1ec1n \u0111\u1ea5t \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh theo c\u00f4ng th\u1ee9c (15) t\u1ea1i m\u1ee5c 4.6.9 theo ti\u00eau chu\u1ea9n TCVN 9362:2012. Khi kh\u00f4ng c\u00f3 s\u1ed1 li\u1ec7u \u0111\u1ecba ch\u1ea5t c\u00f3 th\u1ec3 gi\u1ea3 thi\u1ebft [R] = 100 kN\/m2<\/sup> . Tuy nhi\u00ean ng\u01b0\u1eddi thi\u1ebft k\u1ebf c\u1ea7n ch\u00fa \u00fd \u0111\u1ebfn bi\u1ec7n ph\u00e1p gia c\u1ed1 (v\u00ed d\u1ee5 nh\u01b0 c\u1ecdc tre) cho v\u00f9ng \u0111\u1ea5t y\u1ebfu \u0111\u1ec3 th\u1ecfa m\u00e3n gi\u1ea3 thi\u1ebft tr\u00ean.<\/p>\n

X\u00e1c \u0111\u1ecbnh \u00e1p l\u1ef1c t\u00e1c \u0111\u1ed9ng l\u00ean n\u1ec1n \u0111\u1ea5t \u03c3.<\/h2>\n

\u00c1p l\u1ef1c n\u1ec1n \u0111\u1ea5t t\u00ednh theo c\u00f4ng th\u1ee9c<\/p>\n

\u03c3 = P*k \/ A<\/strong><\/p>\n

Trong \u0111\u00f3:<\/p>\n

    \n
  • P l\u00e0 t\u1ea3i tr\u1ecdng ch\u00e2n c\u1ed9t hay c\u00f2n l\u00e0 t\u1ea3i tr\u1ecdng t\u00e1c d\u1ee5ng l\u00ean m\u00f3ng trong ph\u1ea1m vi xem x\u00e9t. P \u0111\u01b0\u1ee3c t\u00ednh d\u1ef1a tr\u00ean k\u1ebft qu\u1ea3 ph\u00e2n t\u00edch c\u1ee7a ph\u1ea7n m\u1ec1m Etabs ho\u1eb7c Sap… hay g\u1ea7n \u0111\u00fang c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh theo c\u00f4ng th\u1ee9c:<\/li>\n<\/ul>\n

    P = n*S*P0<\/sub><\/strong><\/p>\n

      \n
    • S –\u00a0 di\u1ec7n t\u00edch ch\u1ecbu t\u1ea3i c\u1ee7a c\u1ed9t (minh h\u1ecda theo h\u00ecnh d\u01b0\u1edbi \u0111\u00e2y)<\/li>\n
    • n – s\u1ed1 t\u1ea7ng nh\u00e0.<\/li>\n<\/ul>\n
      \"C\u00e1ch
      X\u00e1c \u0111\u1ecbnh di\u1ec7n t\u00edch ch\u1ecbu t\u1ea3i c\u1ee7a c\u1ed9t.<\/figcaption><\/figure>\n

      P0<\/sub> – l\u00e0 su\u1ea5t tr\u1ecdng t\u1ea3i c\u1ee7a m\u1ed7i m2<\/sup>\u00a0s\u00e0n c\u00f3 th\u1ec3 l\u1ea5y 12 – 15 kN\/m2<\/sup>.<\/p>\n

        \n
      • k l\u00e0 h\u1ec7 s\u1ed1 k\u1ec3 \u0111\u1ebfn s\u1ef1 ph\u00e2n b\u1ed1 kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u c\u1ee7a \u1ee9ng su\u1ea5t d\u01b0\u1edbi \u0111\u00e1y m\u00f3ng. Ch\u1ecdn k = 1.2 (tham kh\u1ea3o M\u00f3ng m\u1ec1m)<\/li>\n<\/ul>\n
        \"C\u00e1ch
        S\u1ef1 ph\u00e2n b\u1ed1 kh\u00f4ng \u0111\u1ed3ng \u0111\u1ec1u c\u1ee7a momen d\u01b0\u1edbi \u0111\u00e1y m\u00f3ng<\/figcaption><\/figure>\n
          \n
        • A l\u00e0 di\u1ec7n t\u00edch ph\u1ea7n d\u01b0\u1edbi \u0111\u00e1y m\u00f3ng. V\u00ed d\u1ee5 nh\u01b0 \u0111\u1ed1i v\u1edbi h\u00ecnh d\u01b0\u1edbi c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh theo c\u00f4ng th\u1ee9c<\/li>\n<\/ul>\n

          A = L1<\/sub>\u00a0* B1<\/sub>\u00a0+ L2<\/sub>\u00a0* B2<\/sub>\u00a0– B1\u00a0<\/sub>* B2<\/sub><\/strong><\/p>\n

          \"C\u00e1ch
          X\u00e1c \u0111\u1ecbnh di\u1ec7n t\u00edch d\u01b0\u1edbi \u0111\u00e1y m\u00f3ng.<\/figcaption><\/figure>\n

          Nh\u01b0 v\u1eady, \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh k\u00edch th\u01b0\u1edbc m\u00f3ng b\u0103ng ch\u00fang ta c\u1ea7n ph\u1ea3i x\u00e1c \u0111\u1ecbnh c\u00e1c b\u1ec1 r\u1ed9ng m\u00f3ng sao cho di\u1ec7n t\u00edch m\u00f3ng b\u1ea3o \u0111\u1ea3m \u0111i\u1ec1u ki\u1ec7n<\/p>\n

          \u03c3 = P * k \/ A \u2264 [R]<\/strong><\/p>\n

          Trong th\u1ef1c h\u00e0nh t\u00ednh to\u00e1n, ch\u00fang ta l\u1ea7n l\u01b0\u1ee3t thay \u0111\u1ed5i b\u1ec1 r\u1ed9ng m\u00f3ng B1, B2 b\u1eb1ng nh\u1eefng gi\u00e1 tr\u1ecb kh\u00e1c nhau cho \u0111\u1ebfn khi th\u1ecfa m\u00e3n \u0111i\u1ec1u ki\u1ec7n tr\u00ean. Th\u00f4ng th\u01b0\u1eddng l\u1ea5y B1 > B2; v\u00ed d\u1ee5 B1 = 1.1m, B2 = 0.9m; B1 = 1.3m, B2 = 1.1m v.v..<\/p>\n

          Chi\u1ec1u cao c\u1ee7a m\u00f3ng, d\u1ea7m m\u00f3ng.<\/h2>\n

          Chi\u1ec1u cao d\u1ea7m m\u00f3ng c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh theo \u0111i\u1ec1u ki\u1ec7n h \u2265 L \/10 (v\u1edbi L l\u00e0 nh\u1ecbp d\u1ea7m). \u0110\u1ec3 t\u00ednh to\u00e1n c\u1ed1t th\u00e9p d\u1ea7m m\u00f3ng ch\u00fang ta c\u1ea7n t\u00ednh \u0111\u01b0\u1ee3c n\u1ed9i l\u1ef1c, tham kh\u1ea3o m\u00f4 h\u00ecnh t\u00ednh to\u00e1n m\u00f3ng b\u0103ng<\/p>\n

          V\u00ed d\u1ee5<\/h2>\n

          X\u00e9t c\u1ed9t \u1edf gi\u1eefa trong d\u1ef1 \u00e1n c\u00f4ng tr\u00ecnh 4 t\u1ea7ng c\u00f3 k\u00edch th\u01b0\u1edbc m\u1eb7t b\u1eb1ng nh\u01b0 h\u00ecnh d\u01b0\u1edbi.<\/p>\n

          \"C\u00e1ch
          B\u1ea3n v\u1ebd k\u00edch th\u01b0\u1edbc m\u00f3ng b\u0103ng<\/figcaption><\/figure>\n

          Ph\u1ea3n l\u1ef1c ch\u00e2n c\u1ed9t:<\/p>\n

          P = 4* 12 * (5.25 + 6.3) \/ 2 * 5 \/ 2 = 693 kN<\/p>\n

          Di\u1ec7n t\u00edch \u0111\u00e1y m\u00f3ng:<\/p>\n

          A = B1 * 5 \/ 2 + B2 * (5.25 +6.3 ) \/ 2 – B1 * B2<\/p>\n

          Ch\u1ecdn B1 = 1.1m v\u00e0 B2 = 0.9m<\/p>\n

          => A = 6.98 m2<\/sup><\/p>\n

          \u03c3 = 693 * 1.2 \/ 6.98 = 119 kN\/m2<\/sup><\/p>\n

          V\u1edbi gi\u1ea3 thi\u1ebft [R] = 100kN\/m2 th\u00ec b\u1ec1 r\u1ed9ng B1, B2 kh\u00f4ng th\u1ecfa m\u00e3n. Do \u0111\u00f3 ta ch\u1ecdn l\u1ea1i B1 & B2.<\/p>\n

          Ch\u1ecdn B1 = 1.3m & B2 = 1.2m<\/p>\n

          => A = 8.65 m2<\/sup><\/p>\n

          \u03c3 = 693 * 1.2 \/ 8.65 = 96 kN\/m2<\/sup><\/p>\n

          V\u1edbi gi\u1ea3 thi\u1ebft [R] = 100kN\/m2 th\u00ec b\u1ec1 r\u1ed9ng B1, B2 c\u00f3 th\u1ec3 th\u1ecfa m\u00e3n.<\/p>\n

          V\u1edbi nh\u1ecbp l\u1edbn nh\u1ea5t l\u00e0 6.3 m ta c\u00f3 th\u1ec3 ch\u1ecdn chi\u1ec1u cao c\u1ee7a m\u00f3ng l\u00e0 600mm.<\/p>\n

          \"C\u00e1ch
          Nh\u00e0 th\u1ea7u x\u00e2y d\u1ef1ng uy t\u00edn s\u1ebd c\u00f3 nh\u1eefng gi\u1ea3i ph\u00e1p, g\u1ee3i \u00fd h\u1ee3p l\u00fd gi\u00fap b\u1ea1n ti\u1ebft ki\u1ec7m \u0111\u01b0\u1ee3c chi ph\u00ed, th\u1eddi gian.<\/figcaption><\/figure>\n

          Sau khi ch\u1ecdn xong k\u00edch th\u01b0\u1edbc m\u00f3ng b\u0103ng, ch\u00fang ta ti\u1ebfn h\u00e0nh t\u00ednh to\u00e1n n\u1ed9i l\u1ef1c trong d\u1ea7m m\u00f3ng b\u1eb1ng m\u00f4 h\u00ecnh t\u00ednh to\u00e1n. Hy v\u1ecdng v\u1edbi th\u00f4ng tin v\u1ec1 c\u00e1ch ch\u1ecdn k\u00edch th\u01b0\u1edbc m\u00f3ng b\u0103ng<\/strong> tr\u00ean c\u00f3 th\u1ec3 mang \u0111\u1ebfn c\u00e1c th\u00f4ng tin b\u1ed5 \u00edch d\u00e0nh cho b\u1ea1n. N\u1ebfu b\u1ea1n \u0111ang c\u00f3 b\u1ea5t c\u1ee9 th\u1eafc m\u1eafc hay c\u1ea7n t\u00ecm m\u1ed9t c\u00f4ng ty thi\u1ebft k\u1ebf x\u00e2y d\u1ef1ng uy t\u00edn<\/strong>, th\u00ec h\u00e3y li\u00ean h\u1ec7 ngay v\u1edbi X\u00e2y D\u1ef1ng Nh\u00e2n \u0110\u1ea1t \u0111\u1ec3 nh\u1eadn \u0111\u01b0\u1ee3c h\u1ed7 tr\u1ee3 t\u1ed1t nh\u1ea5t nh\u00e9!<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

          B\u00e0i vi\u1ebft sau \u0111\u00e2y c\u00f4ng ty thi\u1ebft k\u1ebf x\u00e2y d\u1ef1ng uy t\u00edn X\u00e2y D\u1ef1ng Nh\u00e2n \u0110\u1ea1t s\u1ebd h\u01b0\u1edbng d\u1eabn b\u1ea1n c\u00e1ch ch\u1ecdn k\u00edch th\u01b0\u1edbc m\u00f3ng b\u0103ng s\u01a1 b\u1ed9 b\u1eb1ng nh\u1eefng c\u00f4ng th\u1ee9c h\u1ebft s\u1ee9c \u0111\u01a1n gi\u1ea3n. C\u00e1ch ch\u1ecdn k\u00edch th\u01b0\u1edbc m\u00f3ng b\u0103ng s\u01a1 b\u1ed9 M\u00f3ng n\u00f4ng n\u00f3i chung & m\u00f3ng b\u0103ng n\u00f3i ri\u00eang c\u1ea7m b\u1ea3o […]\n","protected":false},"author":7,"featured_media":10509,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"_links":{"self":[{"href":"https:\/\/xaydungnhandat.com.vn\/index.php?rest_route=\/wp\/v2\/posts\/10840"}],"collection":[{"href":"https:\/\/xaydungnhandat.com.vn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xaydungnhandat.com.vn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xaydungnhandat.com.vn\/index.php?rest_route=\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/xaydungnhandat.com.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10840"}],"version-history":[{"count":1,"href":"https:\/\/xaydungnhandat.com.vn\/index.php?rest_route=\/wp\/v2\/posts\/10840\/revisions"}],"predecessor-version":[{"id":12321,"href":"https:\/\/xaydungnhandat.com.vn\/index.php?rest_route=\/wp\/v2\/posts\/10840\/revisions\/12321"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xaydungnhandat.com.vn\/index.php?rest_route=\/wp\/v2\/media\/10509"}],"wp:attachment":[{"href":"https:\/\/xaydungnhandat.com.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10840"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xaydungnhandat.com.vn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10840"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xaydungnhandat.com.vn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10840"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}