Abstract
In most scale model tests of steel frame structures, researchers have usually paid more attention to the outcome of one single experiment rather than to the similitude error between the scale model and the prototype. As a result, only the experimental data of the scale model are obtained rather than the relationship between the scale model and the prototype, which greatly limits scale model tests in the investigation and is also a significant waste of resources. In addition, the effect of the geometric incomplete similarity in steel joints and its contribution to similitude error of the entire frame has rarely been evaluated in the past. This paper is based on similarity theory, investigating the effect of three incomplete geometric similarity factors on the similitude error between a scale model and a prototype, which are the geometric similarity of steel components, the stiffness of steel joints and the stiffness of the column base. Global sensitivity is found by calculation. Furthermore, this paper presents the correlation of the three factors mentioned based on structural sensitivity analysis by use of BP (Back Propagation) algorithm. A method to investigate the similitude error between the scale model and prototype is proposed that can correct similitude errors in the experimental results.
Highlights
Similarity theory is one of the basic theories in the structural scaled down model test and plays a vital role in engineering-oriented design [1]
This paper investigates the effect of three incomplete geometric similarity factors on the similitude error between the scale model and the prototype, which are the geometric similarity of steel components, the stiffness of steel joints and the stiffness of the column base and the contribution of each to the similitude error within the whole structure
The purpose of this paper is to study the effects of three incomplete similar factors on the overall incomplete similarity error of steel frame structures and its mechanism
Summary
Similarity theory is one of the basic theories in the structural scaled down model test and plays a vital role in engineering-oriented design [1]. This theory is facing the challenges of complicated theoretical derivation, identification of the number of similarity factors and a lack of research into showing the numerical error between the scale model and the prototype [2]. This paper investigates the effect of three incomplete geometric similarity factors on the similitude error between the scale model and the prototype, which are the geometric similarity of steel components, the stiffness of steel joints and the stiffness of the column base and the contribution of each to the similitude error within the whole structure.
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