const Matrix & BeamEndContact3D::getInitialStiff(void) // this function computes the initial tangent stiffness matrix for the element { return getTangentStiff(); }
const Matrix & Quad4FiberOverlay::getInitialStiff(void) { return getTangentStiff(); }
const Matrix & PileToe3D::getInitialStiff(void) { return getTangentStiff(); }
const Matrix & BeamColumnJoint3d::getInitialStiff(void) { return getTangentStiff(); }
const Matrix & SSPquad::getInitialStiff(void) // this function computes the initial tangent stiffness matrix for the element { return getTangentStiff(); }