Test and analysis method for overall fire resistance of high-rise steel frame structure

Abstract

The invention provides a test and analysis method for overall fire resistance of a high-rise steel frame structure. The method includes: establishing a temperature field finite element model and a mechanical field finite element model for a high-rise steel frame structure system; designing corresponding fire condition parameters according to standard fire conditions, establishing a fire dynamics model by a spatial air temperature rise model or by a fluid dynamics calculation procedure FDS to calculate spatial temperature fields under various fire conditions, and using an obtained time-varying spatial temperature field as a thermal boundary condition for the temperature field finite element model of the whole structure; calculating the finite element model by finite element software; calculating the temperature field finite element model by software, substituting the obtained finite element temperature field to the mechanical field finite element model, and calculating to obtain a mechanical field; estimating whether the structure system collapses or not or exceeds the design limits or not according to calculation results; performing quantitative analysis on fire loss economy, and judging the economy of a fire protection design scheme.

Description

technical field [0001] The present invention relates to a technical method for fire-resistant design of steel structures in the technical field of civil engineering, in particular to a method for testing and analyzing the overall fire-resistant performance of high-rise steel frame structures. Background technique [0002] In recent years, all kinds of high-rise and super high-rise steel structures have developed rapidly and vigorously in China. However, the fire resistance of steel is poor, and its mechanical properties such as yield strength and elastic modulus will be significantly reduced under the high temperature of fire. When the temperature reaches 600°C, it will basically lose all its strength and stiffness. High-rise steel structures usually have great fire hazards, burn violently, spread rapidly, and are not easy to extinguish, which may easily cause structural damage or even collapse, causing serious casualties and property losses. [0003] my country's current b...

AI Technical Summary

Problems solved by technology

Taking the overall structure as the object, adopting relatively standardized steps and considering the impact of actual fires at the same time, realize an economical and reliable fire protection design scheme, overcome the shortcomings of the current traditional structural fire design inspection and analysis methods, especially overcome the high requirements of full-scale tests Cost and disadvantages of overall fire performance and fire prevention measures that are difficult to quantify

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