The Effect of Temperature on Prestressed Assemble Steel Struts System in Excavation

Authors

  • Qi Hu , Kai Zhang , Hua-jian Fang*, Xiao-bing Xu , Shao-qi Lu , Jun-guo Song , Yun Chen

Abstract

Based on the long-term monitoring of temperature and stress of two layers of pre-stressed
assemble steel struts (PASS) in a large-scale excavation, the influence of temperature on the axial force of
corner PASS during and after excavation was studied. The monitoring results showed that, during the
excavation, with the increase of earth pressure on the retaining structure and struts, the strut axial force
caused by the temperature change increased and became the greatest after excavation. When the bottom slab
was poured and the second layer of PASS was removed, for the first layer of corner PASS, the maximum
axial force induced by the temperature change was about 5 times of that induced during the early excavation,
which reached 12% of the designed axial force. After that, when the bottom slab achieved the designed
strength, for the first layer of corner PASS, the temperature effect of the strut axial force increased with the
increase of temperature. There was a linear relationship between the strut axial force induced by the unit
increase of temperature and the temperature. The strut axial force produced by the unit increase of
temperature at 30 ? was about 4 times of that at 5 ?.

Published

2020-03-31

Issue

Section

Articles