Field measurement and finite element modeling of temperature and stress evolution in a bridge pile cap

Author(s): M. K. Rahman, M. K. Saeed, S. Khaldoon
Paper category: Proceedings
Book title: Proceedings of the Seventh International Conference on Concrete under Severe Conditions – Environment and Loading
Editor(s): Z.J. Li, W. Sun, C.W. Miao, K.Sakai, O.E. Gjørv, N.Banthia
ISBN: 978-2-35158-124-7
e-ISBN: 978-2-35158-134-6
Publisher: RILEM Publications SARL
Publication year: 2013
Pages: 385-398
Total Pages: 14
Language : English

Abstract: This paper presents the results of field measurements and finite element simulation of a heavily reinforced bridge pile cap located in the Eastern Region of Saudi Arabia. Excessive heat generation and associated cracking in massive concrete elements can potentially compromise the durability of the pile cap. The heat of hydration in mass concrete results in high temperature gradients across the depth of the concrete creating thermal stresses resulting in micro-cracking at the surface. The high temperature in a concrete mass at an early age and continued or intermittent exposure to moisture can also lead to cracking due to delayed ettringite formation. The evolution of temperatures in the mass concrete of the pile cap 9.1 m x 9.1 m x 1.7 m was monitored at 5 locations across the depth using thermocouples. The concrete mix used for the pile cap included 65% replacement of cement with GGBFS. Experimental investigations were also conducted on the field concrete mix to determine mechanical properties and the heat generation using semi adiabatic calorimeter. A 3-D finite element simulation of the pier cap was carried out using the software DIANA. Based on measured thermal and mechanical properties, the temperature rise and temperature gradient and stress distribution were computed and compared with the measured values.

Online publication : 2013
Publication type : full_text
Public price (Euros) : 0.00