Research on Dynamic Response of Concrete-Filled Steel Tube Columns Confined with FRP under Blast Loading

Table 4

Variables of the concrete material model.

Variable

RO

G

A

B

C

N

FC

T

EPS0

EFMIN

SFMAX

PC

UC

PL

UL

D1

D2

K1

K2

K3

Unit

g/mm^3

MPa

—

—

—

—

MPa

MPa

ms^−1

—

MPa

MPa

—

MPa

—

—

—

MPa

MPa

MPa

Value

2.4 × 10^−3

14860

0.79

1.6

0.007

0.61

40

4

0.001

0.01

7

13

0.001

800

0.1

0.04

1

8.5 × 10^4

−1.71 × 10^5

2.08 × 10^5

G: shear modulus; FC: quasi-static uniaxial compressive strength; T: maximum tensile hydrostatic pressure; ESP0: reference strain rate; EFMIN: plastic strain before fracture; SFMAX: normalized maximum strength; PC: crushing pressure; UC: crushing volumetric strain; PL: locking pressure; UL: locking volumetric strain; K₁, K₂, and K₃: pressure constants.