Thin-webbed profile member and panel based on it (variants)

Abstract

Thin-webbed profile members are intended for reacting primarily compressive load and have shape and cross-section dimensions constant along its length. The profile members have main strips and additional strips. The ratio of a width of an additional strip with common reinforcing ribs to a width of the main strip satisfies the expression: a/b=0.3 to 0.7 and the ratio of the thickness of the additional strip with common reinforcing ribs to the thickness of the main strip satisfying the expression: δ a /δ b =1.0 to 3.0. In the expressions, a is the width of the additional strip with common reinforcing ribs, b is the width of the main strip, δ a is the thickness of the additional strip with common reinforcing ribs, and δ b is the thickness of the main strip.

1 . A thin-webbed profile member with cross-section shape and dimensions constant along its length comprising main strips and additional strips with common reinforcing ribs, 
 the ratio of a width of an additional strip with common reinforcing ribs to a width of the main strip satisfying the expression:       a/b =0.3 to 0.7   and the ratio of the thickness of the additional strip with common reinforcing ribs to the thickness of the main strip satisfying the expression: δ a /δ b =1.0 to 3.0    where: a is the width of the additional strip with common reinforcing ribs;    b is the width of the main strip;    δ a  is the thickness of the additional strip with common reinforcing ribs; and    δ b  is the thickness of the main strip; and    so that the stiffness of the main strip does not exceed the stiffness of the additional strip.    
   
   
       2 . A thin-webbed profile member with cross-section shape and dimensions constant along its length comprising at least one main strip and at least one additional strip with at least one common reinforcing rib and at least one free reinforcing rib 
 the ratio of the width of the additional strip with the free reinforcing rib and the common reinforcing rib to the width of the main strip satisfying the expression:       c/b =0.05 to 0.3   and the ratio of the thickness of the additional strip with the free reinforcing rib and the common reinforcing rib to the thickness of the main strip satisfying the expression:     δ c /δ b =1.0 to 3.0   where: b is the width of the main strip;    c is the width of the additional strip with the free reinforcing rib and the common reinforcing rib;    δb is the thickness of the main strip; and    δc is the thickness of the additional strip with the free reinforcing rib and the common reinforcing rib; and    so that the stiffness of the main strip does not exceed the stiffness of the additional strip.    
   
   
       3 . A thin-webbed profile member with cross-section shape and dimensions constant along its length comprising at least one main strip and at least one additional strip with at least one common reinforcing rib and at least one free reinforcing rib, wherein 
 the ratio of the width of the additional strip with a common reinforcing rib to the width of the main strip satisfying the expression:       a/b =0.3 to 0.7   and the ratio of the thickness of the additional strip with a common reinforcing rib to the thickness of the main strip satisfying the expression:     δ a /δ b =1.0 to 3.0   the ratio of width of the additional strip with the free reinforcing rib and the common reinforcing rib to the width of the main strip satisfying the expression:       c/b =0.05 to 0.3   and the ratio of the thickness of additional strip with the free reinforcing rib and the common reinforcing rib to the thickness of the main strip satisfying the expression:     δ c /δ b =1.0 to 3.0   where: a is the width of the additional strip with the common reinforcing rib;    b is the width of the main strip;    c is the width of the additional strip with the free reinforcing rib and the common reinforcing rib;    δ a  is the thickness of the additional strip with common reinforcing ribs;    δ b  is the thickness of the main strip; and    δ c  is the thickness of the additional strip with the free reinforcing rib and the common reinforcing rib; and    so that, the stiffness of the main strip does not exceed the stiffness of the additional strip.    
   
   
       4 . The thin-webbed profile member according to  claim 3 , wherein the stiffness of the additional strip with common reinforcing ribs does not exceed the stiffness of the additional strip with the free reinforcing rib and the common reinforcing rib.  
   
   
       5 . A panel comprising a sheet and thin-webbed profile members as defined in  claim 3  installed across its width longitudinally with even pitch; 
 strip and additional strip are forming with the sheet an open. cross-section configuration, and wherein    characterized in that the thickness of the sheet of the panel satisfies the following expression: δ=(0.0006 to 0.0035)l and the pitch of the longitudinal installation satisfies the expression:       b   c =(20 to 65)δ   where: δ is the thickness of the sheet of the panel;    l is the length of the thin-webbed profile member forming with the sheet the open cross-section configuration;    b c  is the pitch of the longitudinal installation of thin-webbed profile members forming with the sheet the open cross-section configuration; with this, the stiffness of the main strip does not exceed the stiffness of the additional strip, and the stiffness of the additional stria with common reinforcing rigs does not exceed the stiffness of the additional strip with the free reinforcing rib and the common reinforcing rib.    
   
   
       6 . The panel according to  claim 5 , further comprising further thin-webbed profile members installed transversely.  
   
   
       7 . The panel according to  6 , wherein the pitch of transverse installation of thin-webbed profile members satisfies the expression: 
         l   n =(10 to 60) b   c   
     where: l n  is the pitch of transversal installation of thin-webbed profile member for a longitudinally installed thin-webbed profile member forming with the sheet the open cross-section configuration; and 
 b c  is the pitch of the longitudinal installation of thin-webbed profile members forming with the sheet the open cross-section configuration.  
 
   
   
       8 . The A panel comprising a sheet and thin-webbed profile members as defined in  claim 3  installed across its width longitudinally with even pitch; the main strips and additional strips forming with the sheet a closed cross-section configuration, and wherein the thickness of the sheet of the panel satisfies the following expression: 
       δ=(0.0006 to 0.0035) l   
     and the pitch of the longitudinal installation satisfies the expression: 
         b   1   c =(40 to 130)δ where: δ is the thickness of the sheet of the panel;    l is the length of the thin-webbed profile member forming with the sheet the closed cross-section configuration; and    b 1   c  is the pitch of longitudinal installation of thin-webbed profile members forming with the sheet the closed cross-section configuration; and    the stiffness of the main strip does not exceed the stiffness of the additional strip, and the stiffness of the additional strip with common reinforcing ribs does not exceed the stiffness of the additional strip with the free reinforcing rib and the common reinforcing rib.    
   
   
       9 . The panel according to  claim 8 , further comprising further thin webbed profile members installed transversely.  
   
   
       10 . The panel according to  claim 9 , wherein the pitch of transversely installed thin-webbed profile members satisfies the expression: 
         l   1   n =(1.5 to 10) b   1   c   
     where: l 1   n  is the pitch of transversal installation of thin-webbed profile members for the case of longitudinally installed thin-webbed profile member forming with the sheet the closed cross-section configuration; and 
 b 1   c  is the pitch of the longitudinal installation of thin-webbed profile members forming with the sheet the closed cross-section configuration.