A numerical study of prestressed high strength steel tubular members

doi:10.1007/s11709-019-0547-1

Frontiers of Structural and Civil Engineering

2020, Vol. 14

Issue (1): 10-22 https://doi.org/10.1007/s11709-019-0547-1

本期目录

A numerical study of prestressed high strength steel tubular members

Michaela GKANTOU¹(

), Marios THEOFANOUS²(

), Charalampos BANIOTOPOULOS²(

)

¹. Department of Civil Engineering, Liverpool John Moores University, Liverpool L3 3AF, UK
². Department of Civil Engineering, University of Birmingham, Birmingham B15 2TT, UK

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Abstract：

The structural behavior of prestressed high strength steel (HSS) tubular members is investigated through the execution of advanced finite element modeling. Numerical models are developed and validated against published experimental data on HSS tubular members subjected to different levels of initial prestress and loaded either in tension or compression. The effect of the presence or absence of grouting on the strength and ductility of the members is also considered. To numerically replicate the structural response recorded in the tests, some key modeling features including the employed numerical solver, the adopted material models and the element types warrant careful consideration. Upon developing of the finite element models, the numerically generated ultimate loads, the corresponding failure modes and the full load-deformation curves are compared to the experimental ones, indicating a successful validation. As anticipated, prestressing enhances the load-bearing capacity for the tensile members, whereas it is detrimental for the compressive ones. A series of parametric studies is performed to assess the influence of key factors on the structural response of prestressed HSS members and the obtained results are discussed. Design guidance for tensile and compressive prestressed tubular members is also provided.

Key words： finite element prestressing tubular members grout high strength steel

收稿日期: 2018-07-31 出版日期: 2020-02-21

Corresponding Author(s): Michaela GKANTOU,Marios THEOFANOUS,Charalampos BANIOTOPOULOS

引用本文:

. [J]. Frontiers of Structural and Civil Engineering, 2020, 14(1): 10-22.
Michaela GKANTOU, Marios THEOFANOUS, Charalampos BANIOTOPOULOS. A numerical study of prestressed high strength steel tubular members. Front. Struct. Civ. Eng., 2020, 14(1): 10-22.

链接本文:

https://academic.hep.com.cn/fsce/CN/10.1007/s11709-019-0547-1
https://academic.hep.com.cn/fsce/CN/Y2020/V14/I1/10

specimen	prestress level
tensile members (T)	no cable (NG)
	a cable with $P nom$ prestress (NG0)
	a cable with 0.5 $P opt$ prestress (NG1)
	a cable with $P opt$ prestress (NG2)
tensile grouted members (TG)	0.5 $P opt$ (G1)
	$P opt$ (G2)
compressive members (C)	no cable (NG)
	a cable with $P opt$ prestress (NG2)
compressive grouted members (CG)	$P nom$ (G0)
	0.5 $P opt$ (G1)
	$P opt$ (G2)

Tab.1

Fig.1

Fig.2

specimen	$N u,FE / N u,Exp$
T460NG	1.02
T460NG0	1.06
T460NG1	0.98
T460NG2	1.04
T460G1	0.98
T460G2	0.95
T690NG	0.94
T690NG0	0.98
T690NG1	0.94
T690NG2	0.97
T690G1	0.93
T690G2	0.94
mean	0.98
COV	0.04

Tab.2

Fig.3

specimen	$N u,FE / N u,Exp$ (imperfection magnitude)
specimen	measured	L/3000	L/2000	L/1500	L/1000	L/750
C460NG0	1.02	1.08	1.06	1.05	1.00	0.96
C460NG2	0.90	1.12	1.01	1.01	0.95	0.91
C460G0	1.10	1.16	1.14	1.11	1.04	1.00
C460G1	1.17	1.33	1.28	1.25	1.19	1.15
C460G2	1.17	1.30	1.17	1.17	1.14	1.06
C690NG0	0.95	0.96	0.95	0.94	0.92	0.91
C690NG2	0.88	0.91	0.89	0.88	0.86	0.83
C690G0	0.91	0.91	0.90	0.88	0.86	0.84
C690G1	0.93	1.02	1.00	0.99	0.96	0.94
C690G2	0.88	0.83	0.80	0.80	0.78	0.76
mean	0.99	1.06	1.02	1.01	0.97	0.93
COV	0.12	0.16	0.14	0.14	0.13	0.12

Tab.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

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