Web-based Interactive tools for the performance-based assessment and design of ECBP

Failure modes

Yielding of the plate at the tension side, of an ECBP with a Hollow Structural Column Section (HSS), 4-bolt pattern and rigid concrete foundation (Test # 4, Kanvinde et al. [1]).

Plastic deformations of the plate and splitting failure of concrete foundation (test # 1, Gómez et al. [2]).

Trilinear model

Adopted trilinear model for the accurate simulation of the nonlinear rotational response of ECBP. For further information, refer to https://doi.org.

Introduction

Accurate simulation of the nonlinear rotational response of exposed-column-base-plates (ECBP) connections is important from the standpoint of the seismic performance assessment of steel frames. In the absence of guidelines to simulate such response, these connections are often idealized as “pinned” or “fixed,” both of which are inaccurate. In this site, two web-based tools are developed: i) an interactive database with published experimental test-results worldwide, on ECBP subjected to flexure and axial loads ii) an associated tool to characterize the modelling parameters of ECBP subjected to these loads. A trilinear model is adopted to represent various phases of nonlinear response. Further information and details regarding the predictive equations, research methodology followed and discussion of the results can be found in https://doi.org.

Steel ECBP Database

The database contains the test results of 84 specimens in total, aimed at obtaining individual parameters or the full range of the M-θ curves of ECBP with shallow column sections. There are three recognizable categories for the information in the metadata: 1) test setup, 2) reported results and 3) deduced data. For the former category, the following variables are presented as reported by each author: a) column section, b) loading type, c) Axial Load Ratio (ACR), d) bolt pattern, e) thickness of plate and bolts diameter, f) bolt-installation-method, g) measured materials properties. The second category contains the values of the yielding, and the ultimate, rotations and strengths. For the third category, the parameters that are exclusively referred to the trilinear model adopted in this work. In general, the procedure followed has a similar fashion to that used by Lignos and Krawinkler [3] for other cases than ECBP. Besides, additional indicator parameters are deduced for the sake of determining the influent variables on the prediction of the modelling parameters of ECBP through multiple regression analysis. For further information, refer to https://doi.org.

Backbone curve plotter

The backbone-curve-plotter tool predicts the modelling parameters for ECBP, and then, plots their predicted M-θ curves following the trilinear model adopted. The input properties are limited within a range to reach a high significance level of prediction, as furtherly explained in https://doi.org.