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2019 | Book

Introduction Read chapter Read first chapter

Behavior of Unbounded Post- tensioned Masonry Walls

Author: Dr. Reza Hassanli

Publisher: Springer International Publishing

Book Series : Springer Theses

Part of: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik" , Springer Professional "Wirtschaft"

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About this book

This book reports on a comprehensive analytical, experimental and numerical study on the flexural response of post-tensioned masonry walls under in-plane loads. It explores an important mechanism in this new generation of structural walls, called “Self-centering”. This mechanism can reduce residual drifts and structural damage during earthquake ground motion, and is particularly favorable for structures which are designed for immediate occupancy performance levels. The book reports on the development and verification of a finite element model of post-tensioned masonry walls. It describes a detailed parametric study to predict the strength of post-tensioned masonry walls. New design methodologies and expressions are developed to predict the flexural strength and force-displacement response of post-tensioned masonry. Experimental study is carried out to better understand the behavior of post-tensioned masonry walls and also to evaluate the accuracy of the proposed design procedure and expressions. The book also includes an introduction to current research on unbounded post-tensioned masonry walls, together with an extensive analysis of previously published test results.

Table of Contents

Frontmatter
Chapter 1. Introduction
Abstract
Masonry is probably the oldest and one of the most widely used man-made construction materials in the world (Ganz in Post-tensioned masonry structures. SL Report Series 2. VSL International Ltd., Berne, Switzerland, 35 pp, 1990; Bean Popehn and Schultz in Flexural capacity of post-tensioned masonry walls: code review and recommended procedure. PTI J 1(1):28–44, 2003; Drysdale and Hamid in Masonry structures: behavior and design. Canadian masonry and design Center, Mississauga, Ontario, 2005). The major advantage of masonry is that in terms of raw materials it is highly available worldwide and in terms of construction it is easy and economical. Moreover, masonry is a highly durable, fire resistant and sound absorbing material.
Reza Hassanli
Chapter 2. Literature Review
Abstract
This chapter provides a brief review of research on unbonded post-tensioned masonry walls. The chapter is designed to familiarize readers with the extent of the research that has been conducted to date on PT-MWs.
Reza Hassanli
Chapter 3. Strength and Seismic Performance Factors of Post-tensioned Masonry Walls
Abstract
In this chapter, the behavior of PT-MWs is investigated using a database of tested walls. The accuracy of ignoring elongation of PT bars which is considered in the current masonry standard joint committee (MSJC in Building code requirements for masonry structures, ACI 530/ASCE 5, TMS 402, American Concrete Institute, Detroit, 2013) code in evaluating the strength of PT-MWs is studied using the available test results. Using the experimental results, the structural response parameters including ductility, response modification factor and displacement amplification factor are determined for different types of walls including fully grouted, partially grouted, ungrouted walls, walls with confinement plates, walls with supplemental mild steel and walls with an opening.
Reza Hassanli
Chapter 4. Effect of Dimensions on the Compressive Strength of Concrete Masonry Prisms
Abstract
This chapter investigates the accuracy of the height-to-thickness ratio (h/t) correction factors presented in the ASTM standard (ASTM C1314-03) and in other international standards using numerical finite element analysis. The FEM is calibrated with experimental results, and then a parametric study is performed to examine the effect of size on the strength of masonry prisms. Calibration of masonry material provided in this chapter is then used in developing finite element models of PT-MWs presented in Chap. 5.
Reza Hassanli
Chapter 5. Flexural Strength Prediction of Unbonded Post-tensioned Masonry Walls
Abstract
A design equation is developed in this chapter to predict the in-plane flexural strength of unbonded PT-MWs. Using well-validated finite element models, a parametric study is performed to investigate the effect of different parameters on the wall rotation and compression zone length, including axial stress ratio, length and height of the wall, initial to yield stress ratio of PT bars and spacing between PT bars.
Reza Hassanli
Chapter 6. Simplified Approach to Predict the Flexural Strength of Unbonded Post-tensioned Masonry Walls
Abstract
A simplified design approach is developed in this chapter to predict the flexural strength of unbonded PT-MWs. The accuracy of different flexural expressions is also investigated in this chapter according to experimental and finite element modelling results. An analytical procedure is developed to predict the force displacement response of PT-MWs. The accuracy of the analytical model is then validated against available experimental test results for unconfined and confined PT-MWs. Using a similar analytical procedure, a parametric study is performed to obtain the force-displacement response of walls with different features. Multivariate regression analysis is performed to develop an empirical equation to estimate the compression zone length in unbonded PT-MWs. The proposed equation for compression zone length is then incorporated into the flexural analysis of post-tensioned masonry walls and validated against experimental results and finite element results.
Reza Hassanli
Chapter 7. Experimental Investigation of Unbonded Post-tensioned Masonry Walls
Abstract
This chapter reports on an experimental program conducted as a part of this thesis that investigated the behavior of PT-MWs. The accuracy of the MSJC (2013) in ignoring the elongation of PT bars is investigated using the two design equations proposed in Chaps. 5 and 6 to predict the flexural strength of the tested walls. The accuracy of the analytical approach developed in Chap. 6 is verified against the presented experimental results.
Reza Hassanli
Chapter 8. Summary and Conclusions
Abstract
This chapter summarizes the outcomes of this study and proposes a number of recommendations for future research related to this subject.
Reza Hassanli
Backmatter
Metadata
Title
Behavior of Unbounded Post- tensioned Masonry Walls
Author
Dr. Reza Hassanli
Copyright Year
2019
Electronic ISBN
978-3-319-93788-5
Print ISBN
978-3-319-93787-8
DOI
https://doi.org/10.1007/978-3-319-93788-5