4.2.6.14. FPBearingPTVΒΆ

The FPBearingPTV command creates a single Friction Pendulum bearing element, which is capable of accounting for the changes in the coefficient of friction at the sliding surface with instantaneous values of the sliding velocity, axial pressure and temperature at the sliding surface. The constitutive modelling is similar to the existing singleFPBearing element, otherwise. The FPBearingPTV element has been verified and validated in accordance with the ASME guidelines, details of which are presented in Chapter 4 of Kumar et al. (2015a).

element('FPBearingPTV', eleTag, *eleNodes, MuRef, IsPressureDependent, pRef, IsTemperatureDependent, Diffusivity, Conductivity, IsVelocityDependent, rateParameter, ReffectiveFP, Radius_Contact, kInitial, theMaterialA, theMaterialB, theMaterialC, theMaterialD, x1, x2, x3, y1, y2, y3, shearDist, doRayleigh, mass, iter, tol, unit)

eleTag (int)

unique element object tag

eleNodes (list (int))

a list of two element nodes

MuRef (float)

Reference coefficient of friction

IsPressureDependent (int)

1 if the coefficient of friction is a function of instantaneous axial pressure

pRef (float)

Reference axial pressure (the bearing pressure under static loads)

IsTemperatureDependent (int)

1 if the coefficient of friction is a function of instantaneous temperature at the sliding surface

Diffusivity (float)

Thermal diffusivity of steel

Conductivity (float)

Thermal conductivity of steel

IsVelocityDependent (int)

1 if the coefficient of friction is a function of instantaneous velocity at the sliding surface

rateParameter (float)

The exponent that determines the shape of the coefficient of friction vs. sliding velocity curve

ReffectiveFP (float)

Effective radius of curvature of the sliding surface of the FPbearing

Radius_Contact (float)

Radius of contact area at the sliding surface

kInitial (float)

Lateral stiffness of the sliding bearing before sliding begins

theMaterialA (int)

Tag for the uniaxial material in the axial direction

theMaterialB (int)

Tag for the uniaxial material in the torsional direction

theMaterialC (int)

Tag for the uniaxial material for rocking about local Y axis

theMaterialD (int)

Tag for the uniaxial material for rocking about local Z axis

x1 x2 x3 (float)

Vector components to define local X axis

y1 y2 y3 (float)

Vector components to define local Y axis

shearDist (float)

Shear distance from iNode as a fraction of the length of the element

doRayleigh (int)

To include Rayleigh damping from the bearing

mass (float)

Element mass

iter (int)

Maximum number of iterations to satisfy the equilibrium of element

tol (float)

Convergence tolerance to satisfy the equilibrium of the element

unit (int)

Tag to identify the unit from the list below.

  • 1: N, m, s, C

  • 2: kN, m, s, C

  • 3: N, mm, s, C

  • 4: kN, mm, s, C

  • 5: lb, in, s, C

  • 6: kip, in, s, C

  • 7: lb, ft, s, C

  • 8: kip, ft, s, C

See also

Notes