Lezione di Progettazione Strutturale Antincendio a Costruzioni Metalliche del 17 ottobre 2013. Facolta' di Ingegneria Civile e Industriale de La Sapienza di Roma.
8. FIRE SAFETY EDUCATION AT DTU
Fire safety design of steel structures
PERSPECTIVE EXCHANGE STUDENT
DTU SAPIENZA ‐ ERASMUS PROGRAM 2014/15
Available thesis projects on steel structures
1. Structural fire safety of car parks
3. Fire induced collapse of steel structures
2. Thermal resistance of intumescent paints 4. Effect of SSI on ship collision with OWT
Luisa Giuliani
Assistant Professor, Ph.D., P.E.
lugi@byg.dtu.dk
DTU ‐ BYG
Civil Engineering Department
Technical University of Denmark
67. Problems
Approach and methodology
Motivation
A. Indirect stresses
restrain
coefficient
ΔL realized
realized
hindered
ΔL
ΔL
realized
ΔL
γ
ΔL free
displacement of the beam
ΔL realized
LB,real
ΔN
K B, flex
displacement of the column
ΔL hindered
T
ΔN
K C,ax T
N
N + N
LC hind
1
γ
1
LC
KB,flex T
T
K C,ax T
T
K C,ax K B,flex 1 totally free
a
b
LB
Luisa Giuliani ‐
T
T
K B,flex K C,ax 0 totally hidered
Fire safety design of steel structures
76. B. Collapse mode: sway collapse of industrial hall
Denmark 2013
Romania 2010
Alexandru Dondera, MSc thesis, 2013
Luisa Giuliani ‐
Fire safety design of steel structures
77. B. Collapse mode: early beam buckling of tall buildings
HIGH RESTRAINT
= 0.9
THERMAL BUCKLING
600
500
Axial Force (kN)
LOW RESTRAINT
700
400
PLASTIC HINGE
300
200
100
0
‐100
0
100
‐200
200
300
400
500
600
Temperature (°C)
700
800
900 1.000
TENSILE COLLAPSE
IPE 270
HE 1000 M
Riccardo Aiuti, MSc thesis, 2013
Luisa Giuliani ‐
Fire safety design of steel structures
80. Fire safety design of steel structures
LEARNING OBJECTIVES
I. Motivation and strategies:
Explain why structural fire safety is important, and which fire phases are involved,
what is flashover and why it allows for one‐zone model assumption in post FO models
II. Approaches and methodology:
Name three different design approach for structural fire safety and explain the main
difference in each of the 4 design steps for structural verification and design.
IV. Problems:
Explain how mutual stiffness of beams and columns and large displacements
determines sway collapse and buckling collapse of steel structures.
Luisa Giuliani
Assistant Professor, Ph.D., P.E.
lugi@byg.dtu.dk
DTU ‐ BYG
Civil Engineering Department
Technical University of Denmark