Floor joists
The program is checking if the load carrying capacity and stiffness for
floor joists are sufficient.
Building geometry
The distance L is the internal distance between the walls. The spacing a
is the distance c/c between the floor joists. The program uses l = L + 100
mm as beam length to take the width of the support into account.
Loads, characteristic
The dead load for the floor is preset to be 0,5 kN/m2. The dead load for
partition walls etc. is entered in advance as 0,5 kN/m2. The values can
be changed if necessary.
Choose between the predefined live loads for residential buildings (A1)
or offices (B), or choose Other and enter uniformly distributed load,
concentrated load and load reduction factor for the actual live load.
Permissible deflections
The permissible deflection for dead load is entered in advance as l/400
and for live load as l/600 which in accordance with the National Annex
to EN 1995-1-1 normally ensures satisfying performance in terms of
deflection. l is the length of the beam including the width of the
supports. The permissible deflection can be changed by changing the
numbers 400 and 600.
It is possible to enter a maximum deflection for a 1 kN concentrated
load. For multistorey buildings, a maximum deflection of 1,7 mm will,
according to the National Annex, normally ensure satisfying
performance in terms of deflection.
TRÆrapport 11 BJÆLKEdim 7
rapport BEAMdesign to UK national annex user manual and design assumptions
CONTENT 3 7 7 8 9 11 12 13 General Beam types Floor joists Floor beam Rafters Window lintel Ridge beam Conditions of use 2 BJÆLKEdim TRÆrapport 11
General The program BJÆLKEdim can check if the load carrying capacity and stiffness are sufficient for floor joists, floor beams, rafters, window lintels and ridge beams /cross beams. The calculations are based on Eurocode and the associated Danish National Annexes. Save/Load It is possible to save
Timber quality Choose between the predefined timber qualities or choose Other. All timber is presupposed to be CE marked with a strength specification (C-class for structural timber, GL-class for glulam and D-class for hardwood). For glulam please note the following: For cross sections with a maximu
Safety factors Choose the consequence class for the construction. According to the Eurocode 0 the three consequence classes are defined by: Low: The consequences of failure include a low risk of loss of human life. The economic, social and environmental consequences are small or negligible. Medium:
Partial results The partial results are calculated for the entered beam depth. If a beam depth is not entered under Timber cross section no partial results will be displayed. Partial results for bending and shear are displayed for the relevant load combinations. For compression perp. is given the re
Floor joists The program is checking if the load carrying capacity and stiffness for floor joists are sufficient. Building geometry The distance L is the internal distance between the walls. The spacing a is the distance c/c between the floor joists. The program uses l = L + 100 mm as beam length t
Floor beam The program is checking if the load carrying capacity and stiffness are sufficient for floor beams that support floor joists. It is assumed that the floor joists are single-span beams supported at one end by the floor beam, as opposed to continuous beams supported midway by the floor bea
Rafters The program is checking if the load carrying capacity and stiffness are sufficient for the rafters. The roof angle must be between 5 and 45 degrees. The overhang u is considered, but the moment over the bearing is not checked. Wind up-lift is not a deciding factor for the dimensioning of ra
The dead load is also combined with either the point load 1,5 kN or the snow load. Snow load details If the box Auto is checked the program will automatically calculate the snow load for a pitched roof with a normal snow load. If the rafters must be examined for an increased snow load due to risk of
Window lintel The program is checking if the load carrying capacity and stiffness are sufficient for a window lintel or a beam over a façade opening that supports rafters with overhang. The load from the rafters on the window lintel is applied as a uniformly distributed load but if the length of th
Ridge beam /cross beam The program is checking if the load carrying capacity and stiffness are sufficient for a ridge beam or a cross beam that supports rafters. It is presupposed that the ridge beam/cross beam is placed vertically and that the rafters are single-span beams, joined over the ridge b
Conditions of use The conditions described in Terms of use of calculation programs are applicable for all calculation programs published by Træinformation. The conditions can be read and downloaded in Danish from www.traeinfo.dk. About Træinformation Since 1954 Træinformation has provided the Danis