Shaping of Axially Compressed Bipolarly Prestressed Closely Spaced Built-Up Members Cover

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Shaping of Axially Compressed Bipolarly Prestressed Closely Spaced Built-Up Members

Architecture, Civil Engineering, Environment

Volume 13 (2020): Issue 1 (March 2020)

By: Monika SIEDLECKA

Open Access

|Apr 2020

Figures & Tables

Examples of composite closely spaced built-up member (CSBUM) sections built of a pair of: (a)–(f) channel sections, (g)–(l) angle sections

Bipolar prestressing diagram of prestressed CSBUM with symmetrical boundary conditions [42]

Exemplary diagrams of BPCSBUMs

Geometry of an example BPCSBUM with two-sided pinned support (a) view, (b) cross-sections

Static model of the CSBUM chord in the prestressing zone

An example of finite element grid

An example of a BPCSBUM – calculation steps: (a) Initial, (b) Prestressing, (c) Buckling analysis

Calculation example (a) standard CSBUM (b) BPCSBUM

The result of FEM simulation on BPCSBUM built from a pair of UPE120 channel sections with the length of the prestressing zone L2 = 2100 mm: (a) 3D view, (b)–(e) 2D view according to the thickness of the spacer td: (b) td = 4 mm, (c) td = 8 mm, (d) td = 12 mm, (e) td = 16 mm

The result of FEM simulation on BPCSBUM built from a pair of UPE120 channel sections with the length of the prestressing zone L2 = 2100 mm: (a) 3D view, (b)–(e) 2D view according to the thickness of the spacer td: (b) td = 4 mm, (c) td = 8 mm, (d) td = 12 mm, (e) td = 16 mm

Comparison of numerical (FEM) and analytical (mod) results for BPCSBUM: (a) 2xUPE120, L2 = 2100 mm, (b) 2xUPE120, L2 = 2400 mm

Comparison of numerical (FEM) and analytical (mod) results for BPCSBUM: (a) 2xUPE160, L2 = 2100 mm, (b) 2xUPE160, L2 = 2100 mm

Critical load bearing capacity of BPCSBUM built of: (a) 2xUPE120, (b) 2xUPE160

Description of the BPCSBUM geometry

2xUPE120
L₂	[mm]	2100				2400
*t_d*	[mm]	4	8	12	16	4	8	12	16
J_z1(8)	[cm⁴]	258.50
*J_z2(x=150.0)* (9)	[cm⁴]	286.99	318.18	352.04	388.60	286.99	318.18	352.04	388.60
*J_z,sr* (14)	[cm⁴]	268.48	279.39	291.24	304.04	269.90	282.37	295.92	310.54
2xUPE160
L₂	[mm]	2100				2400
*t_d*	[mm]	4	8	12	16	4	8	12	16
J_z1(8)	[cm⁴]				457.42
*J_z2(x=150.0)* (9)	[cm⁴]	501.02	548.42	599.62	654.60	501.02	548.42	599.62	654.60
*J_z,sr* (14)	[cm⁴]	472.68	489.27	507.19	526.43	474.86	493.82	514.30	536.29

Geometric characteristics of UPE120 and UPE160

Section	A_ch	J_y,ch	J_z,ch	i_z,ch	e_z,ch
	[cm²]	[cm⁴]	[cm⁴]	[cm]	[cm]
UPE120	16.8	392	60.7	1.90	2.02
UPE160	23.7	965	114	2.19	2.20

Critical load capacity of BPCSBUM

L₂	t_d=S_max	N_cr ^mod(23)	N_cr,PBSB ^MES	ζ₁	ζ₂
[mm]	[mm]	[kN]	[kN]	[%]	[%]
2xUPE120
2100	4	601.2	594.4	1.14	18.72
	8	624.9	631.8	-1.09	23.40
	12	650.6	671.1	-3.06	28.48
	16	678.3	712.0	-4.73	33.95
2400	4	615.2	570.9	7.76	21.49
	8	643.4	608.1	5.81	27.05
	12	673.9	647.7	4.05	33.08
	16	706.8	689.5	2.51	39.57
2xUPE160
2100	4	1060.3	1043.0	1.66	17.32
	8	1096.5	1097.0	-0.05	21.32
	12	1135.5	1154.2	-1.62	25.64
	16	1177.3	1180.2	-0.25	30.26
2400	4	1083.1	1005.8	7.69	19.84
	8	1125.9	1061.0	6.12	24.57
	12	1172.1	1119.1	4.74	29.69
	16	1221.7	1187.8	2.85	35.17

DOI: https://doi.org/10.21307/acee-2020-007 | Journal eISSN: 2720-6947 | Journal ISSN: 1899-0142

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Language: English

Page range: 87 - 100

Submitted on: Sep 5, 2019

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Accepted on: Dec 28, 2019

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Published on: Apr 8, 2020

Published by: Silesian University of Technology

In partnership with: Paradigm Publishing Services

Publication frequency: 4 issues per year

Keywords:

Axially compressed member,

Bipolarly prestressed member,

Bipolarly prestressed closely spaced built-up member,

Bisymmetrical cross-section,

Closely spaced built-up member,

Load-bearing capacity

Related subjects:

Architecture and design,

Architects, buildings

© 2020 Monika SIEDLECKA, published by Silesian University of Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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