摘要
Bridge structures experience complex thermal effects under the influence of environmental factors and internal heat sources,leading to adverse impacts on structural safety and durability.To enhance comprehension of bridge temperature issues and mitigate adverse thermal stress and deformation,the fundamental principles of“resistance”,“release”,“prevention”,and“utilization”are summarized based on the causes of thermal effects,which are resisting thermal stress,releasing thermal deformation,preventing temperature actions,and utilizing thermal effects.Subsequently,typical approaches are summarized based on each principle.Under the“resistance”principle,measures such as rational reinforcement design,increasing early concrete strength,and utilizing new materials with high tensile strength can be employed to reduce the risk of structural cracking.Following the“release”principle,techniques like proper arrangement of expansion joints and bearings,flexible foundation design for jointless bridge and mass concrete layering method can be utilized to release thermal deformations.Based on the“prevention”principle,reducing the hydration heat,applying heat-insulating coatings,shading panels,and phase-change materials can decrease temperature differences in the structure.Improved calculation of thermal effects during construction can also aid in construction control.Based on the“utilization”principle,it is possible to strengthen arch bridges and treat expansion joints with the help of favorable thermal effects.Finally,the advancements are prospected to make the bridge better adapted to the thermal effects.
基金
funded by the Fundamental Research Funds for the Central Universities,CHD(grant number 300102213703)
the National Natural Science Foundation of China(grant number 52108111).
作者简介
Zhiyuan Ma obtained his bachelor degree from Chang'an University.Currently,he is a PhD candidate in the School of Highway,Chang'an University,China.His main research field is temperature actions and effects of bridges,including concrete,steel,and composite bridges.E-mail addresses:mazhiyuan@chd.edu.cn;Yongjian Liu is the professor in the School of Highway,Chang'an University.He has more than 30 years of experience in teaching,researching and technical consulting of bridge engineering.His research interests include theory and application of steel,steel-concrete composite and steel-wood composite bridge,industrial construction technology and application of small and medium span bridge,temperature action and thermal effect of bridge,monitoring and structural analysis of bridge.E-mail addresses:liuyongjian@chd.edu.cn;Corresponding author:Jiang Liu obtained his doctoral degree from Chang'an University.Currently,he is an associate professor of bridge engineering in the School of Highway,Chang'an University.His main research field is temperature action and effect of bridges,including concrete,steel and composite bridges.E-mail addresses:liu-jiang@chd.edu.cn;Yi Lyua,E-mail addresses:2021021032@chd.edu.cn.
