Micromechanical Simulation of Earthquake-Induced Fracture in Steel Structures
Abstract/Contents
- Abstract
- Characterized by large-strain low-cycle conditions, earthquake-induced fractures are quite different from high-cycle fatigue fractures that have been extensively studied in bridges and mechanical components. Cyclic loading of structures due to earthquakes involves many fewer cycles (typically less than ten cycles) than conventional low-cycle fatigue and strains that are well in excess of yield. Such conditions can be termed as ultra-low-cycle fatigue (ULCF). Traditional techniques to predict fracture under ULCF are not nearly as well developed as those for other limit states. Computationally intensive micromechanical models, which aim to capture fundamental fracture initiation mechanisms of void growth and coalescence, show great promise in predicting failure due to inelastic fracture and ULCF commonly seen during earthquakes. This research develops and applies such models for simulating inelastic earthquake-induced fractures with an emphasis on ductile crack initiation due to monotonic and cyclic loading. The research includes complementary computational (finite element) and experimental studies that utilize state-of-the-art fracture and micromechanical models to analyze failures. Over two hundred tests (and complementary finite element analyses) are carried out on seven different varieties of steel. The experiments include monotonic and cyclic stress-strain tests for materials, standard fracture tests, smooth notched fracture tests, as well as pull-plate tests that resemble structural configurations. Based on the simulation results and tests, models to simulate ductile crack initiation under ULCF are developed and validated. The study (1) validates monotonic micromechanical models for structural steels and makes recommendations for their use (2) generates material toughness data for a variety of structural steels (3) proposes new mechanisms for ULCF (4) develops new micromechanical models for ULCF based on these mechanisms (5) uses experiments similar to structural details to validate the micromechanical models and (6) comments on the limitations of such approaches and makes recommendations for future research.
Description
| Type of resource | text |
|---|---|
| Date created | 2004-07 |
| Language | English |
Creators/Contributors
| Author | Kanvinde, AM |
|---|---|
| Author | Deierlein, GG |
Subjects
| Subject | mechanical properties |
|---|---|
| Subject | fracture |
| Subject | structural materials |
| Subject | seismic performance |
| Subject | experimental |
| Genre | Technical report |
Bibliographic information
| Related item | |
|---|---|
| Location | https://purl.stanford.edu/bf412yb0418 |
Access conditions
- Use and reproduction
- User agrees that, where applicable, content will not be used to identify or to otherwise infringe the privacy or confidentiality rights of individuals. Content distributed via the Stanford Digital Repository may be subject to additional license and use restrictions applied by the depositor.
- License
- This work is licensed under a Creative Commons Attribution 3.0 Unported license (CC BY).
Preferred citation
- Preferred Citation
- Kanvinde, AM and Deierlein, GG. (2004). Micromechanical Simulation of Earthquake-Induced Fracture in Steel Structures. John A. Blume Earthquake Engineering Center Technical Report 145. Stanford Digital Repository. Available at: http://purl.stanford.edu/bf412yb0418
Collection
John A. Blume Earthquake Engineering Center Technical Report Series
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- Contact
- jabeec-email@stanford.edu
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