Precast and post-tensioned systems increase the efficiency of masonry beams in terms of labor and time of construction. This study is aimed at evaluating the flexural behavior of ungrouted post-tensioned concrete masonry beams, with eccentric bars, and the effect of the main design parameters on their structural performance when subjected to monotonic and unidirectional cyclic loading until failure. All beams failed in flexure by crushing of the masonry in the compression region. Masonry strength was the design parameter that had the most significant effect on the load-deflection behavior of post-tensioned masonry beams. The test results showed that the measured nonlinear load-deflection behavior and the correlation between bar stress increase and midspan deflection can be estimated using a multi-linear relationship. Beams tested under monotonic and unidirectional cyclic loading exhibited comparable load-deflection envelope response.
Bibliographical noteFunding Information:
This work was financially supported by Universidad de Medellin. The authors would like to acknowledge the support of Adoquin-Ar prefabricated, especially to their manager Mr. Juan P. Arbelaez for his valuable technical comments and suggestions. Authors also acknowledge the unconditional support and technical assistance from the students of the Department of Civil Engineering at the Universidad de Medellin during testing and numerical processing of the results. The authors also recognize the support to Ingeconcreto Ltda. for providing the laboratory test facilities. The first author gratefully acknowledges the financial support received from COLCIENCIAS , Ministerio de Eduación de Chile and Enlazamundos Municipio de Medellín-Colombia. The fourth author expresses his gratitude to the Universidad Militar Nueva Granada (UMNG, Colombia) for granting research scholarships.
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- Eccentric bar
- Flexural behavior