LS Thresholds: Analytical estimation - Cylindrical Piers Retrofitted with RC Jacket

Element Properties

H(m):

Height of Pier

Num. of Elements:

Number of elements - Mesh

Fibers Perimeter:

Number of Fibers along Perimeter

Fibers Radius:

Number of Fibers along Radius

Section Properties

Geometry

D_core (m):

Diameter of core section

c_core (m):

Cover of core section

t_FRP (mm):

Thickness of FRP

Materials

1. Concrete of core section (OpenSees Material 04)*

fco_{, core} (kPa):

Concrete compressive strength (unconfined) of core section

ec_{, core}:

Concrete strain at maximum strength of core section

ecu_{, core}:

Concrete strain at crushing strength of core section

Ec_{, core} (kPa):

Initial Stiffness of core section (see Opensees Mat04)

fct_{, core} (kPa):

Maximum tensile strength of concrete of core section

et_{, core}:

Ultimate tensile strain of concrete of core section

FRP-Confined concrete properties estimated according to Spoelstra & Monti (1999)Spoelstra, B. M. R., & Monti, G. (1999). FRP-Confined Concrete Model. Journal of Composites for Construction, 3(3), 143–150

2. FRP

f_FRP (kPa):

Tensile strength of FRP

E_FRP:

Modulus of Elasticity of FRP

ε_{cu, FRP}:

Maximum strain of FRP

3. Reinforcement steel of core section (OpenSees Material 02)

fy_{, core} (kPa):

Yield strength of reinforcement steel of core section

E_{0, core} (kPa):

Initial Elastic Tangent of core section (see Opensees Mat02)

b_{, core}:

Strain - Hardening ratio (ratio between post-yield tangent and initial elastic tangent) of core section (see Opensees Mat02)

Reinforcement (core)

Φ_{L, core} (mm):

Diameter of Longitudinal Reinforcement of core section

Num. of Long. Reinf. Bars of core:

Total number of longitudinal reinforcement bars of core section

Φ_{w, core} (mm)::

Diameter of Transverse Reinforcement of core section

s_core (m):

Distance of transverse reinforcement of core section

Analysis Properties & Loading

N (kN):

Vertical Load (G+0.3Q)

d_target (m):

Target Displacement for Pushover Analysis

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