Experimentally validated FEA models of HF2V damage free steel connections for use in full structural analyses

Abstract

Abstract. The aim of this research is to model the behaviour of recently developed high force to volume (HF2V) passive energy dissipation devices using a simple finite element (FE) model. Thus, the end result will be suitable for use in a standard FE code to enable computationally fast and efficient analysis and design. Two models are developed. First, a detailed axial model that models an experimental setup is created to validate the approach versus experimental results. Second, a computationally and geometrically simpler equivalent rotational hinge element model is presented. Both models are created in ABAQUS, a standard nonlinear FE code. The elastic, plastic and damping properties of the elements used to model the HF2V devices are based on results from a series of quasi-static force-displacement loops and velocity based tests of these HF2V devices. Comparison of the FE model results with the experimental results from a half scale steel beam-column sub-assembly are within 10% error. The rotational model matches the output of the more complex and computationally expensive axial element model. The simpler model will allow computationally efficient non-linear analysis of large structures with many degrees of freedom, while the more complex and physically accurate axial model will allow detailed analysis of joint connection architecture. Their high correlation to experimental results helps better guarantee the fidelity of the results of such investigations.

HF2V dissipator effects on the performance of a 3 story moment frame

“…A comparison between the experimental data from the test in Figure 2 and that from the simple hinge model developed is shown in Figure 3 (Desombre et al 2011). Note that the experimental results in Figure 3 have multiple cycles to 4% drift without any notable stiffness or strength degradation (Mander et al 2009) …”

“…The HF2V joint connection design to be modelled is shown in Figure 2 for an experimental 50% scale steel beam column connection used to investigate device properties and their impact on hysteretic steel connection behaviour (Desombre et al 2011;Mander et al 2009). The beam end is cut at an angle of 0.1 radians to provide space for joint rotational motion to be transmitted to the device.…”

“…Initial stiffness proportional Rayleigh damping of 5% was used in the first mode. Velocity dependence of the device dissipation was incorporated into the modelling following Equation (1) (Desombre et al 2011). …”

Modelling of mandrel rotary draw bending for accurate twist springback prediction of an asymmetric thin-walled tube

“…This paper introduces a surface-based coupling constraint for flexible mandrel using "hinge" connector element, which joins the position of two nodes and provides a revolute connection between their rotational degrees of freedom. By modelling the joint with an equivalent rotational HINGE connector element, the number of degrees of freedom can be reduced sufficiently to be more easily used in multi-body system analyses with minimal added degrees of freedom or computational cost (Desombre et al, 2011). The whole equivalent coupling hinge model of flexible mandrel is illustrated in Fig.…”

Nonlinear Finite-Element Modeling of HF2V Lead Extrusion Damping Devices: Generic Design Tool

“…In recent years, LEDs have been modified to a smaller volumetric size with high force capacities, called high force to volume (HF2V) devices (Rodgers 2009;Latham et al 2013;Mander et al 2009;Bacht et al 2011;Desombre et al 2011;Golzar et al 2017;Rodgers et al 2010). HF2V devices are generally manufactured for a force capacity of 50-1,000 kN.…”