详情

Impact of Extreme Summer Temperatures on Bridge Structures

项目名称：	Impact of Extreme Summer Temperatures on Bridge Structures
摘要：	Research has shown that heat waves affect thermal expansion joints, accelerate material degradation, and increase stresses in prestressed concrete girders. Specifically, experimental and analytical investigations indicate a significant increase in stresses at both the tension and compression regions of structural members exposed to extreme summer temperatures. The increase of stresses may widen current cracks and create new cracks that accelerate concrete and steel deterioration. In other words, the effects of extreme temperatures may reduce the durability, serviceability, and stability of bridge structures. This research project will investigate the effects of extreme temperatures on prestressed concrete bridges. The project includes three primary parts: (i) a laboratory and experimental investigation, (ii) development of a computer program, and (iii) finite element modeling of the stress distribution due to temperature variations. The laboratory and experimental investigation will measure temperature distribution in two full-scale sections of a BT-72 bridge girder. A computer program will be developed to determine the temperature distribution and the corresponding thermal stresses in the girder cross sections. This program will be validated through the evaluation of six American Association of State Highway and Transportation Officials (AASHTO) I girders and three AASHTO-PCI Bulb-Tee sections. Finite element modeling will be developed to include two-dimensional and three-dimensional models. The two-dimensional model will be used to determine the temperature distribution within the girder cross-sections. The two-dimensional model will be used to investigate the global behavior of the girders including the bridge deck. The project will also propose a new thermal gradient model that will account for the effects of extreme temperatures. A computer program will be developed to assist users with the quantification of the thermal stress distribution within prestressed concrete bridge girders. The minimum reinforcement ratio and placement of non-prestressed reinforcement will be refined based on the research findings.
状态：	Active
资金：	107888.00
资助组织：	University of Arkansas, Fayetteville<==>Arkansas Department of Transportation<==>Research and Innovative Technology Administration
执行机构：	University of Arkansas, Fayetteville
开始时间：	20140801
实际结束时间：	20160731
主题领域：	Bridges and other structures；Design；Highways