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Calculation sheet
Compression member
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ProjectOriginated
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LocationChecked
Compression member
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OwnerApproved
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Standard
BS EN 1993-1-1:2010 Design of Steel Structures - Part 1-1
Date6/9/2026
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I.
STANDARD AND DOCUMENT
Nhập
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BS EN 1993-1-1:2010 Design of Steel Structures - Part 1-1
Xuất
TƯƠNG QUAN GIỮA TCVN & EUROCODE
Bước 1: Tính hệ s ố quy đổi = fcuk /fcu
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TCVNB25B30B35B45
Bước 2: Tính cường độ trung bình của mẫu chịu nén (fcm) của bê tông ở tuổi 28 ngày cho mẫu lập phương fcm(cu) = fcuk/fcu * fcm(c)
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II.
INPUT DATA
M350M400M450M600
Bước 3: So sánh các giá trị cườngđộ trung bình của cac m ẫu thử theo TCVN và của EUROCODE 4 một cách gần
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1.
The dimension of cross section
Tiêu chuẩnLớp độ bềnC20/25C25/30C30/37C35/45C40/50C45/55C50/60
đúng ta có các con số của bảng bên.
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I, H shape - WeldedEUROCODEMẫu hình trụ28333843485358
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h400 mmh2 fcm (Mpa)Mẫu lập phương354646,7556064,769,6
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b1400 mmb2
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400 mm
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tf30 mmtf23
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30 mmClassfckEcmfctmSteel
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tw20 mmtw2N/mm2N/mm2N/mm2TypefyffufwsE
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C20/2520290002,2MPaMPaMpaMpaMpa
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C25/3025305002,6CCT342202103401532,10E+05
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Cross section
As =308cm2C30/3730320002,9CCT382402293801712,10E+05
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PerimeterPs =2400mmC35/4535335003,2CCT422602484201892,10E+05
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Moment of inertia about y-y
Iy = 88870,66667cm4C40/5040350003,5SS330195186330148,52,10E+05
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Moment of inertia about z-z
Iz = 32022,66667cm4C45/55 45360003,8SS4002352244001802,10E+05
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Elastic section modulus taken about the y -axis
Sy4443,533333cm3C50/6050370004,1SS490275262490220,52,10E+05
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Elastic section modulus taken about the z -axis
Sz1601,133333cm3
Characteristic compressive str fck (cylinders)
SS5403903715402432,10E+05
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Plastic section modulus about the y-axis
Zy5018cm3
Mean tensile strength fctm
Q295A275262390175,52,10E+05
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Plastic section modulus about the z-axis
Zz2434cm3
Secant modulus of elasticity Ecm
Q295B275262390175,52,10E+05
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The effective length of member
Lcr =7000mmQ345A325310470211,52,10E+05
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Q345B325310470211,52,10E+05
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2.
The material strength
Q345C325310470211,52,10E+05
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Steel grade
Q345B
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Yield strength of structural steel
fy325Mpa
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Young modulus
Es =2,10E+05N/mm2
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The load data
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Compression force
NEd7138kN
The section is satisfied
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III.
CALCULATION
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1.
Section classification
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For webQ345D325310470211,52,10E+05
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c/t =17,00-Q345E325310470211,52,10E+05
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e =0,85-
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1Web is Class 1
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For flange
Part subject to compression
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c/t =6,33
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e =0,85
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1Flange isClass 1
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1Section isClass 1
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Part subject to compression
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2.
Compression (No buckling)
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Internal compression part (Web)
Internal compression part (Web)
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The design value of the compression force, NEd must be smaller than the design resitance of the
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cross-section for uniform compression Nc,Rd
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NEd/ Nc,Rd ≤ 1.0
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Where
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NEd7138kN
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A30800mm2
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gM01-
partial factor for resistance of cross -section whatever the class is
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Nc,Rd10010kN
A x fy/ gM0
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3.
Compression (Buckling)
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The design value of the compression force, NEd must be smaller than the design
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buckling resistance of the compression member, Nb,Rd
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NEd/Nb,Rd ≤ 1
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Buckling curves
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Where
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Ncr = 3,76E+04kN
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0,52-
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but c ≤ 1.0
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Where
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a0,34-
imperfection factor
Determine the buckling curve
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ф0,69
Buckling curve
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c0,88-
Cross section
Limits
Buckling about axis
S235,S275,S355, S420
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gM11-
resistance of member to instability assessed by member check
Rolled sectionsh/b > 1.240 < tf <=100y-yb
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NbRd8779,22kN
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The section is satisfied
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