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

Abstract

The present group of inventions pertains to building and mechanical engineering and can be implemented in structural load-carrying components. Thin-webbed profile member is intended for reacting primarily compressive load and is embodied with shape and cross-section dimensions constant along its length. Three variants of thin-webbed profile members are proposed. The novelty is embodiment of the shapes with optimum relation of cross-section dimensions corresponding to minimum mass. Two variants of panel are based on all three variants of thin-webbed profile members installed in longitudinal or in longitudinal and transversal directions. Thin-webbed profile members installed longitudinally form with the sheet the open or closed cross-section configuration. The novelty is embodiment of he panels with optimum relation of cross-section dimensions of thin-webbed profile members, thickness of the sheet, pitch of longitudinal and transversal installation corresponding to minimum mass of the panel.

1 . The thin-webbed profile member with cross-section shape and dimensions constant along its length comprising main strip(s) and additional strip(s) with common reinforcing ribs 
 characterized in that the ratio of the width of the additional strip with common reinforcing ribs to the width of the main strip satisfies the expression:     a/b= 0.3÷0.7  (1),    and the ratio of the thickness of the additional strip with common reinforcing ribs to the thickness of the main strip satisfies the expression:   δ a /δ b =1.0÷3.0  (2),    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;  
 δ b  is the thickness of the main strip;  
 with this, the stiffness of the main strip does not exceed the stiffness of the additional strip.  
   
     
     
         2 . The thin-webbed profile member with cross-section shape and dimensions constant along its length comprising main strip(s) and additional strip(s) with common reinforcing rib(s) and free reinforcing ribs 
 characterized in that 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 satisfies the expression:     c/b= 0.05÷0.3  (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 satisfies the expression:   δ c /δ b =1.0÷3.0  (4),    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;  
 δ b  is the thickness of the main strip;  
 δ c  is the thickness of the additional strip with the free reinforcing rib and the common reinforcing rib;  
 with this, the stiffness of the main strip does not exceed the stiffness of the additional strip.  
   
     
     
         3 . The thin-webbed profile member with cross-section shape and dimensions constant along its length comprising main strip(s) and additional strip(s) with common reinforcing ribs and free reinforcing rib(s) 
 characterized in that the ratio of the width of the additional strip with common reinforcing ribs to the width of the main strip satisfies the expression:     a/b= 0.3÷0.7  (1),    and the ratio of the thickness of the additional strip with common reinforcing ribs to the thickness of the main strip satisfies the expression:   δ a /δ b =1.0÷3.0  (2),    with this, 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 satisfies the expression:     c/b= 0.05÷0.3  (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 satisfies the expression:   δ c /δ b =1.0÷3.0  (4),    where: 
 a is the width of the additional strip with common reinforcing ribs;  
 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;  
 δ c  is the thickness of the additional strip with the free reinforcing rib and the common reinforcing rib;  
 with this, the stiffness of the main strip does not exceed the stiffness of the additional strip.  
   
     
     
         4 . The thin-webbed profile member according to Clause  3 , 
 characterized in that 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 . The panel comprising a sheet and thin-webbed profile members installed across its width longitudinally with even pitch; with this, the main strip(s) and additional strip(s) are forming with the sheet an open cross-section configuration, 
 characterized in that the thickness of the sheet of the panel satisfies the following expression:   δ=(0.0006÷0.0035) l   (5),    and the pitch of the longitudinal installation satisfies the expression:     b   c =(20÷65)δ  (6),    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 strip with common reinforcing ribs does not exceed the stiffness of the additional strip with the free reinforcing rib and the common reinforcing rib.  
   
     
     
         6 . The panel according to Clause  5 , 
 characterized in that it is additionally equipped with thin-webbed profile members installed transversally.    
     
     
         7 . The panel according to Clause  6 , 
 characterized in that the pitch of transversal installation of thin-webbed profile members satisfies the expression:     l   n =(10÷60) b   c   (7),    where: 
 l 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 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.  
   
     
     
         8 . The panel comprising a sheet and thin-webbed profile members installed across its width longitudinally with even pitch; with this, the main strip(s) and additional strip(s) are forming with the sheet a closed cross-section configuration, 
 characterized in that the thickness of the sheet of the panel satisfies the following expression:   δ=(0.0006÷0.0035) l   (5),    and the pitch of the longitudinal installation satisfies the expression:     b   1   c =(40÷130)δ  (8),    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;  
 b 1   c  is the pitch of longitudinal installation of thin-webbed profile members forming with the sheet the closed 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 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 Clause  8 , 
 characterized in that it is additionally equipped with thin-webbed profile members installed transversally.    
     
     
         10 . The panel according to Clause  9 , 
 characterized in that the pitch of transversal installation of thin-webbed profile members satisfies the expression:     l   1   n =(1.5÷10) b   1   c   (9)    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;  
 b 1   c  is the pitch of the longitudinal installation of thin-webbed profile members forming with the sheet the closed cross-section configuration.