A built-up beam with solid wood flanges and plywood or woodbase panel product webs.
                                                            
                                                     
                        
                                                
                        
                        
                            A built-up beam with solid timber flanges (a) and plywood or wood-base panel product webs (b).
                                                            
                                                     
                        
                                                
                        
                        
                            hollow structural member that supports loads.
                                                            
                                                     
                        
                                                
                        
                        
                            Hollow structure constructed of separate structural members connection by their length with intermediate braces between the members.