Selection of a Material Model for Simulating Concrete Masonry Walls Subjected to Blast
Selection of a Material Model for Simulating Concrete Masonry Walls Subjected to Blast

Author:

Publisher:

Published: 2004

Total Pages: 147

ISBN-13:

DOWNLOAD EBOOK

One of the most common methods of construction is the use of concrete masonry units (CMU) in the walls of buildings. However, they are vulnerable to blast, and result in collapse, fragmentation, and severe injury to occupants. An understanding of the behavior of CMU walls during blast is key to developing mitigation techniques. Research has been conducted using the finite element method to simulate structural failure due to blast. A common problem faced by model developers is the selection of constitutive relationships that appropriately simulate the behavior of materials subjected to shock loading. This project examined the effect of blast impulse loading on CMU blocks. Finite element models were used to perform direct transient analysis using various material cards available in LS-DYNA, and the results were compared to the results of full-scale blast tests conducted by AFRL. The material card that best agreed with the test results was recommended for use in the models of polymer reinforced masonry walls.

Nonlinear Finite Element Analysis of Reinforced Concrete Structures Subjected to Transient Thermal Loads [microform]
Nonlinear Finite Element Analysis of Reinforced Concrete Structures Subjected to Transient Thermal Loads [microform]

Author: Cheng En Zhou

Publisher: National Library of Canada = Bibliothèque nationale du Canada

Published: 2004

Total Pages: 288

ISBN-13: 9780612913240

DOWNLOAD EBOOK

The results obtained from four numerical tests indicate that the proposed computational scheme and the implemented codes are accurate and reliable. The need to incorporate fire loads into reinforced concrete structural design has long been recognized, and the traditional design method for structural fire resistance has been widely practiced by engineers mainly because of its simplicity. To simulate the structure's response to thermal loads, this research develops and implements a 2D nonlinear finite element transient analysis for reinforced concrete structures subjected to high temperatures. The proposed computational scheme takes into account time-varying thermal loads, heat-of-hydration effects, and temperature-dependent material properties. Algorithms for calculating the closed-form element stiffness for a quadrilateral element with a fully-populated material stiffness are also developed. Then, the capability of a 2D nonlinear finite element transient thermal analysis is implemented into program VecTor2(c), a nonlinear analysis program for 2D reinforced concrete membranes.