Method for calculating importance factor of frame structural member considering internal force sub-item contribution degrees

Abstract

The invention relates to a method for calculating an importance factor of a frame structural member considering internal force sub-item contribution degrees. The method comprises the following steps: firstly, based on linear and elastic material hypothesis, calculating each internal force sub-item of a framework beam and a column member by utilizing a strain energy equation and a framework node-external load relationship; then dividing each member internal force sub-item value by a member ultimate bearing capacity, thereby obtaining an inner force sub-item importance factor of the member; and finally, considering the combined effect of each inner force sub-item, and defining a comprehensive importance factor of the member. The method provided by the invention has the advantages that firstly, the importance factor is calculated based on the inner force sub-items of the member, the process is simple and is easy to realize, the physical significance is definite, and the engineering applicability is good; and secondly, the inner force sub-item importance factor of the member can be used for judging the resistance utilization rate (safety stock) of the member, and the comprehensive importance factor obtained on the basis of the sub-item importance factor can show the contribution degree of the member on the overall bearing capability of the framework system under the action of a given external load.

Description

technical field [0001] The invention relates to a method for calculating the importance coefficient of a frame structure component considering the sub-item contribution degree of internal force. Background technique [0002] In recent years, the continuous collapse of structures caused by accidents or terrorist attacks has often caused huge economic losses and casualties. [1] , making the progressive collapse of structures aroused widespread concern in the field of civil engineering. Structural progressive collapse is defined as the initial local damage develops to other parts through components, and finally the whole structure or local collapse occurs. Progressive collapse is characterized by the loss of load-carrying capacity of a relatively small part of the structure, which in turn triggers a series of failures that affect the balance of the overall structure [2] . The focus of the collapse of building structures is the impact of local component failure or damage on t...

AI Technical Summary

Problems solved by technology

The physical meaning represented by this coefficient value is clear, but limited by the analysis method, it cannot fully reflect the degree of influence on the overall elastic-plastic properties

[0006] There are still some problems in the existing component importance coefficient calculation method: whether the importance evaluation index of the component has a clear physical meaning; whether it can directly express the use of component resistance and the contribution to the overall bearing capacity of the structural system; whether the calculation method is simple , easy to understand, for better application in practical engineering

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