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How do China, the United States and Europe account for accidental eccentricity in seismic design?

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  Regulations and Methods for Considering Accidental Eccentricity Effects in Seismic Design in China, the United States and Europe 1. Regulatory Basis ● China The Code for Seismic Design of Buildings (GB 50011-2010) stipulates that accidental eccentricity must account for uncertainties in structural mass distribution, stiffness distribution, and spatial variations in seismic motion. Torsional effects shall be calculated using either static or dynamic methods. ● United States ASCE 7-22 (American Society of Civil Engineers Standard) requires consideration of accidental torsional effects, typically calculated using static methods, with verification through dynamic analysis results. ● Europe Eurocode 8 (EN 1998-1:2004) simulates the misalignment between mass centres and stiffness centres by introducing accidental eccentricity, and mandates consideration of the effects of bidirectional seismic actions . 2. Definition and Values of Random Eccentricity ● China Eccentricity: ±5% of the ...

 


The chessboard -shaped quadrilateral mesh grid has good overall and stability, flexible plane layout, the upper string rod of the structure is short and the lower chord is long. The rods of the exchange are relatively small, the roof structure is simple, and the construction is convenient. The emergence of a large number of new materials, new processes, and new technologies in modern times fully reflects the advancedness, economy and rationality of the grid structure. In the future, the chessboard -shaped quadrilateral cone network shelf will be used more and more many.

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