Related Experiment Video
Updated: Jun 4, 2025
12:07
Three-dimensional Biomimetic Technology: Novel Biorubber Creates Defined Micro- and Macro-scale Architectures in Collagen Hydrogels
Published on: February 12, 2016
9.2K
An OpenSees Surrogate Constitutive Model for High-Damping Rubber Based on Machine Learning
Feng Li1, Tianbo Peng1,2
1College of Civil Engineering, Tongji University, Shanghai 200092, China.
Polymers
|December 17, 2024
Summary
A new HDRGA material was developed for OpenSees, simplifying a complex constitutive model for high-damping rubber (HDR) seismic isolation. This material accurately simulates HDR performance during earthquakes.
Area of Science:
- Civil Engineering
- Materials Science
- Computational Mechanics
Background:
- High-damping rubber (HDR) is crucial for seismic isolation in structures but has complex mechanical properties.
- Existing constitutive models for HDR pose challenges for implementation in finite element analysis.
- Previous research introduced a novel HDR constitutive model using Gated Recurrent Unit (GRU) and attention mechanisms.
Purpose of the Study:
- To simplify and implement a previously proposed HDR constitutive model into the OpenSees finite element analysis platform.
- To develop a user-friendly HDR material (HDRGA) within OpenSees for seismic engineering simulations.
- To validate the accuracy and performance of the developed HDRGA material.
Main Methods:
- Simplification of a GRU-attention based HDR constitutive model.
- Conversion of the simplified model into a uniaxial material format for OpenSees.
- Development of HDRGA material code (header and source files) for OpenSees.
- Validation using a two-node model and a single-pier model with comparative analysis against test and simulation results.
Main Results:
- Successful development and implementation of the HDRGA material in OpenSees.
- The HDRGA material accurately characterizes the mechanical properties of HDR.
- Validation studies confirmed the material's capability to perform well under seismic loading conditions.
- Comparative analysis showed good agreement between the HDRGA material simulations and experimental/calculated results.
Conclusions:
- The developed HDRGA material provides an effective tool for simulating HDR behavior in seismic isolation applications within OpenSees.
- The implementation facilitates the use of advanced constitutive models in practical engineering simulations.
- The HDRGA material demonstrates reliable performance for seismic analysis of structures incorporating HDR components.
Related Concept Videos
01:16Dynamic Modulus of Elasticity of Concrete
254
The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
254
01:20Elasticity in Concrete
82
Upon subjecting concrete to moderate or high uniaxial compressive or tensile stresses, the strain response is non-linear relative to the stress applied. As the stress is removed, the resulting stress-strain curve deviates from the original path traced during loading, creating a hysteresis loop, indicative of the concrete's non-linear and non-elastic properties. Typically, a material's modulus of elasticity, which is a measure of the material's stiffness, is inferred from the linear...
82
01:20Types of Damping
6.4K
If the amount of damping in a system is gradually increased, the period and frequency start to become affected because damping opposes, and hence slows, the back and forth motion (the net force is smaller in both directions). If there is a very large amount of damping, the system does not even oscillate; instead, it slowly moves toward equilibrium. In brief, an overdamped system moves slowly towards equilibrium, whereas an underdamped system moves quickly to equilibrium but will oscillate about...
6.4K
01:17Rolling Resistance: Problem Solving
293
Rolling resistance, also known as rolling friction, is the force that resists the motion of a rolling object, such as a wheel, tire, or ball, when it moves over a surface. It is caused by the deformation of the object and the surface in contact with each other, as well as other factors like internal friction, hysteresis, and energy losses within the materials. Rolling resistance opposes the object's motion, requiring additional energy to overcome it and maintain movement. In practical...
293
01:23Behavior of Concrete Under Compressive Load
143
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
As the concrete specimen fractures under...
143
01:18Residual Stresses in Bending
152
In the study of elastoplastic members subjected to bending moments, understanding the loading and unloading phases is crucial for assessing material behavior and structural integrity. During the loading phase, as the bending moment increases, the material initially responds elastically, adhering to Hooke's Law, where stress is directly proportional to strain. When the load exceeds the yield strength, plastic deformation occurs, resulting in permanent strain and deformation that remains even...
152