Matias Chacon

Matias Chacon
Pontifical Catholic University of Chile | UC · Departamento de Ingeniería Estructural y Geotécnica

Estructural Engineering PhD. MSc.
Nonlinear material models (steel, concrete, masonry, timber) and high-fidelity finite elements models of structures

About

16
Publications
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122
Citations

Publications

Publications (16)
Article
Full-text available
Strong seismic events frequently strike Chile. The last three significant events that caused considerable damage and losses are the 2010 (Mw\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt...
Article
This study examines experimentally and numerically the in-plane behavior of a steel-spline Cross-Laminated Timber (CLT) connection with self-tapping screws. Although this connection is a strong, rapid, and cost-effective alternative suitable for CLT diaphragms of tall timber-concrete buildings, no previous cyclic/monotonic testing has been document...
Article
Full-text available
It presents a new multi-spring finite element model called P2PE to simulate the cyclic response of panel-to-panel cross-laminated timber joints. Five uncoupled linear/nonlinear springs represent the fasteners and contact between panels. User-element/materials were implemented in ANSYS, giving all computer implementation steps, and for a free downlo...
Article
It presents a new high-fidelity phenomenological-based model called ASPID that includes asymmetry, pinching, strength/stiffness degradation, and low-cycle fatigue to simulate the cyclic response for any timber assembly/members. Free to download in Python code for non-commercial use.
Article
Buildings with Reinforced Concrete (RC) walls are commonly used to resist lateral forces in seismic countries because they provide high lateral stiffness and strength. In recent earthquakes, shear wall buildings have shown good behavior in general; however, a small percentage underwent severe damage localized typically in lower stories. Several num...
Article
Nonlinear dynamic analysis techniques have made significant progress in the last 20 years, providing powerful tools for assessing structural damage and potential building collapse mechanisms. The fact that several reinforced concrete shear wall residential buildings underwent severe structural damage in walls at the lower building levels during the...
Article
Complex building models consider multiple degrees of freedom and modeling assumptions that influence the accuracy of the predicted seismic response. This study evaluates the epistemic uncertainty inherent to modeling assumptions by evaluating the seismic response behavior of six instrumented reinforced concrete free-plan structures in Santiago, Chi...
Conference Paper
Full-text available
This paper describes the reconnaissance work conducted by researchers from the National Research Center for Integrated Natural Disaster Management (CIGIDEN) between September 23 rd and October 2 nd in the area affected by the M w 8.3 Illapel megathrust earthquake, which struck offshore the coast of the Coquimbo Region in central Chile on September...
Conference Paper
Full-text available
This study quantifies the epistemic uncertainty of several modeling assumptions in evaluating the seismic response of six reinforced concrete free-plan office buildings located in Santiago, Chile. The assumptions analyzed are: (1) the in-plane and out-of-plane stiffness of the diaphragms; (2) the simplified soil-structure interaction model; and (3)...
Article
Reinforced concrete shear wall buildings have shown, in statistical terms, an adequate performance in past seismic events. However, a specific damage pattern was observed in 2010 Chile earthquake in some shear walls located in the lower building stories, usually associated with high axial stresses, lack of transverse reinforcement, and vertical irr...
Conference Paper
Full-text available
A brittle damage pattern has been observed in some reinforced concrete (RC) shear wall buildings during recent earthquakes. Although substantial experimental and analytical research has been conducted, many questions remain about the inelastic behavior of shear walls and their interaction with the rest of the three-dimensional structure. This artic...
Conference Paper
Full-text available
Los edificios de planta libre son una tipología común en Chile y el mundo. En todos los casos, el diseño sísmico de estos edificios en la práctica se realiza usando modelos de elementos finitos de software comercial. El objetivo de esta investigación es estimar la incertidumbre epistémica de la respuesta dinámica de tres modelos lineales de seis ed...

Questions

Question (1)
Question
Hi
I'm tring to implement in ANSYS or Matlab the "smeared rotating total strain" model of concrete. I have difficulties in convergence, for example, in a simple FEM wall model loaded in pure compression or tension.
Could your please give more information on how to improve the implemention of this model in a more robust way?. In special I request more information about how is the iterative process to obtain the consistent tangent stiffness.

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