Abstract
The main objective of this study is to characterize the main factors which may affect the behavior of segmental prestressed concrete beams comprised of multi segments. The 3-D finite element program ABAQUS was utilized. The experimental work was conducted on twelve simply supported segmental prestressed concrete beams divided into three groups depending on the precast segments number. They all had an identical total length of 3150mm, but each had different segment numbers (9, 7, and 5 segments), in other words, different segment lengths. To simulate the genuine fire disasters, nine beams were exposed to high-temperature flame for one hour, the selected temperatures were 300°C (572°F), 500°C (932°F) and 700°C (1292°F) as recommended by ASTM–E119. Four numerical models have been utilized to represent the unburned and the burned specimens at the three elevated temperatures. Calibration and simulation of the experimental work were conducted, while comparisons were made with the experimental results. These included the prestress effect, load-deflection relation under applied load, and load at failure of the reference beam and the beams after the exposure to fire.
Highlights
Segmental box girder bridges are one of the major new developments in bridge engineering
NUMERICAL CASE STUDY The main goal of this research is to find the effect of the segment number on the post-fire behavior of the segmental www.etasr.com prestressed concrete beams whose results were too complicated to be obtained by experimental work
From the FE analysis result, it can be seen that the models are stiffer than the experimental specimens
Summary
Segmental box girder bridges are one of the major new developments in bridge engineering. Authors in [5] studied the mechanical properties of high-performance concrete (HPC) and the normal-strength concrete (NSC) after exposure to high temperature of 800°C. Authors in [12] used a method called the “Residual Area Method” to determine the temperature profile for concrete-encased I-sections. Authors in [13] studied the structural behavior of unbonded post-tensioned one-way spanning concrete slabs in fire conditions. This research seeks to give an explanation and a simplified estimation of the fire-induced damage produced in precast segmental prestressed concrete beams with the use of 3-D finite element analysis by utilizing the ABAQUS program to calibrate and simulate the experimental work conducted to study the behavior of internally prestressed precast concrete segmental beams with selective parameters such as segment length, number of joints between segments and the exposure to different burning temperatures
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