Skip to content

Verification Example 05

Jump to bottom
Vassilis Papanikolaou edited this page Jan 13, 2020 · 1 revision

Partial fixity end releases

Download Example 5 model (v2.7.0)

Description

This example describes how to model the partial fixity end releases in GiD+OpenSees. The model consists of a cantilever beam subjected to a uniform load. At the fixed end of the frame element the partial fixity moment (Mz) and shear (Vy) springs have been assigned. The vertical tip deflection of the cantilever obtained with the FE analysis program GiD+OpenSees is compared with SeismoStruct calculations. The FE models lie in the X-Y plane.

Geometry and Properties

Material Properties:

E = 29.783868 GPa

G = 12.409945 GPa

Section Properties:

A = 0.3048 m2

I = 0.01686 m4

Note: An element distributed load equal to 16.41 kN/m is applied on the members

Modeling and Loading

The partial fixity moment and shear springs are modeled by using a link element, which is characterized by a stiffness value k = 94564 kN/m in F3 and k = 439263 kN-m/rad in M2 respectively, both with a linear symmetric response curve. The other degrees-of-freedom are considered infinitely stiff.

The FE model is shown below:

Analysis Type

Static analysis (with geometric nonlinearities disabled)

Results and Comparison

The most significant results are compared in the table below:

Output Parameter GiD+OpenSees SeismoStruct 2016
Uy,2 [m] -0.02029 -0.02029

Fani Derveni, Vassilis K. Papanikolaou

Developed in the Lab of R/C and Masonry Structures, School of Civil Engineering, Aristotle University of Thessaloniki, Greece, by T. Kartalis-Kaounis, V.K. Protopapadakis and T. Papadopoulos, Dipl. Civil Engineers, under the coordination of V.K. Papanikolaou, Assistant Professor.

Clone this wiki locally