TY - JOUR
T1 - Time-dependent behavior of full-scale precast post-tensioned (PCPT) girders
T2 - Experimental and finite element analysis
AU - Joyklad, Panuwat
AU - Ali, Nazam
AU - Chaiyasarn, Krisada
AU - Suparp, Suniti
AU - Hussain, Qudeer
N1 - Publisher Copyright:
© 2022 The Authors
PY - 2022/12/1
Y1 - 2022/12/1
N2 - Excessive volumetric changes associated with shrinkage and non-uniform moisture and heat distribution along long-span girders induce unwanted curvatures. This study aims at investigating both short- and long-term measurements of various quantities involving midspan deflections, tendon strains, longitudinal steel bar strains, concrete strains, and thermal changes in precast-post-tensioned (PCPT) girders. A total of 2 PCPT girders were cast in this study with symmetrical structural and geometrical details. Post-tensioning of the first and second girders was performed on the 28th and 120th days of their casting, respectively. Long-term measurement was performed on the first girder. It was observed that all measured parameters increased swiftly during post-tensioning. During the initial 30 days after post-tensioning, a gradual increase in all parameters was observed, whereas all measured parameters exhibited negligible increase beyond that. A Finite Element Model was generated using ATENA to estimate short-term deflections of PCPT girders during post-tensioning. In general, a good agreement between experimental and analytical midspan deflections was observed.
AB - Excessive volumetric changes associated with shrinkage and non-uniform moisture and heat distribution along long-span girders induce unwanted curvatures. This study aims at investigating both short- and long-term measurements of various quantities involving midspan deflections, tendon strains, longitudinal steel bar strains, concrete strains, and thermal changes in precast-post-tensioned (PCPT) girders. A total of 2 PCPT girders were cast in this study with symmetrical structural and geometrical details. Post-tensioning of the first and second girders was performed on the 28th and 120th days of their casting, respectively. Long-term measurement was performed on the first girder. It was observed that all measured parameters increased swiftly during post-tensioning. During the initial 30 days after post-tensioning, a gradual increase in all parameters was observed, whereas all measured parameters exhibited negligible increase beyond that. A Finite Element Model was generated using ATENA to estimate short-term deflections of PCPT girders during post-tensioning. In general, a good agreement between experimental and analytical midspan deflections was observed.
KW - Finite element analysis
KW - Long-term deflection
KW - Post-tensioned
KW - Pre-cast concrete
UR - https://www.scopus.com/pages/publications/85134638803
U2 - 10.1016/j.cscm.2022.e01310
DO - 10.1016/j.cscm.2022.e01310
M3 - Article
AN - SCOPUS:85134638803
SN - 2214-5095
VL - 17
JO - Case Studies in Construction Materials
JF - Case Studies in Construction Materials
M1 - e01310
ER -