Fire-damaged Concrete Structural Reliability Analysis And Treatment Measures

In recent years, Building (mainly concrete structure) fire occurred frequently, a linear upward trend. Because of staff and building high-level intensive, large-scale and the use of composite functions.But so far, domestic and international research is still relatively limited, the construction of concrete structures in place under Fire, which are at the exploratory stage, the structure on a comprehensive survey of post-disaster damage analysis, comprehensive detection and identification, reinforcement design optimization, reinforcement construction of new Technology, there is no clear norms and regulations to follow, it is a serious obstacle to the development of the project construction, and has become a real problem before us.In this paper, examples are given specific projects, focusing on the construction of concrete structures afterfire scene investigation, detection and evaluation, reinforcement techniques optimize the design and construction of new measures were in-depth study and exploration, made a number of effective methods and recommendations Provide some reference for future practical engineering studies.First, survey the scene after the fire, the fire temperature is calculated to draw the fire temperature zoning plan, developed evaluation criteria on the classification burning of Handan, shooting the damaged structure of the burning state, identify the damaged components'number and location, extent of the damage recorded quantitative indicators, damaged by burning level.Secondly, the use of new technologies now present stage of concrete structures after fire quantitative and qualitative identification of the numerical calculation to solve the previous means of detection and fire damage does not match the complexity of the disadvantages.Then, the structure is designed to maximize use of capacity remaining after the fire, the method proposed site design, in addition to partial replacement of concrete to be seriously damaged components, other methods are used to repair patch reinforcement design. At the same time, the typical calculation of reinforced concrete structures damaged. Finally, focus on strengthening implementation plan, presented on the main line of reinforcement construction, focusing on the key process of construction, and strengthening the construction of the new technology optimization.The project was completed in May 2009, due to take practical measures in the above method and put into use in recent years, the whole structure in good condition and found no abnormalities, and supervision by the owners, supervision departments of praise, and received good social and economic benefits.