prEN1995-1-1 - Eurocode 5 - Design of timber structures

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Final draft of EN 1995-1-1
Foreword
6
SECTION 1 GENERAL ..................................................................................................... 9
1.1 SCOPE ...................................................................................................................................... 9
1.1.1 SCOPE OF EUROCODE 5 ....................................................................................................... ...... 9
1.1.2 SCOPE OF EN 1995-1-1................................................................................................................. 9
1.2 NORMATIVE REFERENCES ............................................................................................... 10
2.2 ASSUMPTIONS.......................................................................................................................... 12
2.3 DISTINCTION BETWEEN PRINCIPLES AND APPLICATION RULES ............................................... 12
1.3 DEFINITIONS ........................................................................................................................ 13
1.4 SYMBOLS USED IN PART 1-1 OF EN 1995 ...................................................................... 14
SECTION 2 BASIS OF DESIGN .................................................................................... 19
2.1 REQUIREMENTS .................................................................................................................. 19
2.1.1 Basic requirements......................................................................................................................... 19
2.1.2 Reliability management ................................................................................................................. 19
2.1.3 Design working life and durability ........................................................................................ ........ 19
2.2 PRINCIPLES OF LIMIT STATE DESIGN ........................................................................... 19
2.2.1 General .......................................................................................................................................... 19
2.2.2 Ultimate limit states ..................................................................................................... .................. 19
2.2.3 Serviceability limit states............................................................................................... ................ 20
2.3 BASIC VARIABLES..............................................................................................................20
2.3.1 Actions and environmental influences........................................................................................... 20
2.3.1.1 General................................................................................................................. ...................... 20
2.3.1.2 Load-duration classes ................................................................................................................ 20
2.3.1.3 Service classes ......................................................................................................... .................. 21
2.3.2 Materials and product properties ................................................................................................... 21
2.3.2.1 Load-duration and moisture influences on strength................................................................... 21
2.3.2.2 Load-duration and moisture influences on deformations........................................................... 22
2.4 VERIFICATION BY THE PARTIAL FACTOR METHOD ................................................. 22
2.4.1 Design value of material property ......................................................................................... ........ 22
2.4.2 Design value of geometrical data................................................................................................... 23
2.4.3 Design resistances........................................................................................................ .................. 23
2.4.4 Verification of equilibrium (EQU) ......................................................................................... ....... 24
2.5 DESIGN ASSISTED BY TESTING ...................................................................................... 24
SECTION 3 MATERIAL PROPERTIES ....................................................................... 26
3.1 GENERAL .............................................................................................................................. 26
3.1.1 STRENGTH AND STIFFNESS PARAMETERS ........................................................................ 26
3.1.2 STRESS-STRAIN RELATIONS .................................................................................................. 26
3.1.3 STRENGTH MODIFICATION FACTORS FOR SERVICE CLASSES AND LOAD
DURATION CLASSES ............................................................................................................... ................. 26
3.1.4 DEFORMATION MODIFICATION FACTORS FOR SERVICE CLASSES ............................. 26
3.2 SOLID TIMBER ..................................................................................................................... 28
3.3 GLUED LAMINATED TIMBER........................................................................................... 29
3.4 LAMINATED VENEER LUMBER (LVL) ........................................................................... 29
3.5 WOOD-BASED PANELS ...................................................................................................... 30
3.6 ADHESIVES........................................................................................................................... 30
3.7 METAL FASTENERS............................................................................................................ 30
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Final draft prEN 1995-1-1
SECTION 4 DURABILITY.............................................................................................. 31
4.1 RESISTANCE TO BIOLOGICAL ORGANISMS ................................................................ 31
4.2 RESISTANCE TO CORROSION .......................................................................................... 31
SECTION 5 BASIS OF STRUCTURAL ANALYSIS..................................................... 33
5.1 GENERAL .............................................................................................................................. 33
5.2 MEMBERS ............................................................................................................................. 33
5.3 CONNECTIONS..................................................................................................................... 33
5.4 ASSEMBLIES .................................................................................................................. ...... 34
5.4.1 GENERAL................................................................................................................... .................. 34
5.4.2 FRAME STRUCTURES .......................................................................................................... ..... 34
5.4.3 SIMPLIFIED ANALYSIS OF TRUSSES WITH PUNCHED METAL PLATE FASTENERS .. 35
5.4.4 PLANE FRAMES AND ARCHES ............................................................................................... 36
SECTION 6 ULTIMATE LIMIT STATES ..................................................................... 37
6.1 DESIGN OF CROSS SECTIONS SUBJECTED TO STRESS IN ONE PRINCIPAL
DIRECTION ...................................................................................................................................... 37
6.1.1 TENSION PARALLEL TO THE GRAIN .................................................................................... 37
6.1.2 TENSION PERPENDICULAR TO THE GRAIN ........................................................................ 37
6.1.3 COMPRESSION PARALLEL TO THE GRAIN ......................................................................... 38
6.1.4 COMPRESSION PERPENDICULAR TO THE GRAIN ............................................................. 38
6.1.5 BENDING ................................................................................................................... .................. 40
6.1.6 SHEAR ..................................................................................................................... ..................... 41
6.1.7 TORSION ................................................................................................................... ................... 42
6.2 DESIGN OF CROSS SECTIONS SUBJECTED TO COMBINED STRESSES ................... 42
6.2.1 COMPRESSION STRESSES AT AN ANGLE TO THE GRAIN................................................ 42
6.2.2 COMBINED BENDING AND AXIAL TENSION ...................................................................... 43
6.2.3 COMBINED BENDING AND AXIAL COMPRESSION ........................................................... 43
6.2.4 COMBINED TENSION PERPENDICULAR TO THE GRAIN AND SHEAR .......................... 44
6.3 STABILITY OF MEMBERS.................................................................................................. 44
6.3.1 GENERAL................................................................................................................... .................. 44
6.3.2 MEMBERS SUBJECTED TO COMPRESSION AND BENDING (COLUMNS) ...................... 44
6.3.3 LATERAL TORSIONAL BUCKLING OF BEAMS ................................................................... 45
6.4 DESIGN OF CROSS SECTIONS IN MEMBERS WITH VARYING CROSS-SECTION OR
CURVED SHAPE.............................................................................................................................. 46
6.4.1 GENERAL................................................................................................................... .................. 46
6.4.2 SINGLE TAPERED BEAMS .......................................................................................................47
6.4.3 DOUBLE TAPERED, CURVED AND PITCHED CAMBERED BEAMS................................. 48
6.5 NOTCHED MEMBERS ......................................................................................................... 50
6.5.1 GENERAL................................................................................................................... .................. 50
6.5.2 BEAMS WITH A NOTCH AT THE SUPPORT .......................................................................... 51
6.6 MEMBERS WITH HOLES .................................................................................................... 52
6.7 SYSTEM STRENGTH ........................................................................................................... 53
SECTION 7 SERVICEABILITY LIMIT STATES ........................................................ 55
7.1 JOINT SLIP............................................................................................................................. 55
7.2 LIMITING VALUES FOR DEFLECTIONS OF BEAMS..................................................... 55
7.3 VIBRATIONS......................................................................................................................... 56
7.3.1 GENERAL................................................................................................................... .................. 56
7.3.2 VIBRATIONS FROM MACHINERY .......................................................................................... 57
7.3.3 RESIDENTIAL FLOORS ........................................................................................................ ..... 57
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Final draft of EN 1995-1-1
SECTION 8 CONNECTIONS WITH METAL FASTENERS....................................... 59
8.1 GENERAL .............................................................................................................................. 59
8.2 LATERAL LOAD-CARRYING CAPACITY OF METAL DOWEL-TYPE FASTENERS. 60
8.2.1 TIMBER-TO-TIMBER AND PANEL-TO-TIMBER CONNECTIONS...................................... 60
8.2....