Steel structure fire disaster temperature field inverse presumption method based on displacement forms

Abstract

The invention discloses a steel structure fire disaster temperature field inverse presumption method based on displacement forms. The method comprises the following steps that field investigation is conducted on a steel structure after a fire disaster, the structure is divided into different grids, the geometric center point of each grid is used as a displacement characteristic point, and displacement values of the displacement characteristic points are measured; a finite element calculation model is established; the established finite element calculating model is used for determining a temperature-displacement topological matrix between the temperature change of a structure rod piece in a single grid and displacement of the displacement characteristic points of the other grids; a temperature correction weight matrix is calculated according to the distance relationships between the displacement characteristic points; temperature field inverse iteration presumption is conducted. By means of the steel structure fire disaster temperature field inverse presumption method, temperature field distribution of the steel structure in the fire disaster can be accurately and quantitatively obtained and accurate input conditions is provided for finite element simulation of the steel structure after the fire disaster. The steel structure fire disaster temperature field inverse presumption method is high in result precision, has universality and has wide application prospects in the fields such as performance estimation, repair and reinforcement, disassembly scheme making of steel structures after fire disasters.

Description

technical field [0001] The invention discloses a method for reverse estimation of a fire temperature field of a steel structure based on a displacement form, and belongs to the technical field of steel structure calculation methods. Background technique [0002] Steel structure is one of the main structural forms of large-scale buildings and industrial buildings at present. Because of its advantages of high strength, light weight, short construction period and good economic benefits, it is widely used in construction, bridge and water conservancy projects and other industries. The steel structure has many characteristics such as beautiful appearance, reasonable force, and various structural systems. It is favored by structural designers, especially the large-span space structure technology has become one of the symbols representing the development level of a country's construction technology. [0003] Building fire is one of the common disasters. According to statistics, the...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to solve the problem that the existing methods relying on experience to judge the structure overfire temperature and the FDS fire temperature field simulation restoration method cannot accurately reflect the distribution of the real fire temperature field, and are prone to deviations in the analysis of the residual performance of the structure. A method for determining the temperature field of steel structures after fire with high calculation accuracy by calculating the temperature of the fire field through displacement

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