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Indexed by:期刊论文

Date of Publication:2022-06-29

Journal:世界地震工程

Volume:30

Issue:1

Page Number:41-49

ISSN No.:1007-6069

Abstract:For the seismic analysis of structural members subjected to three
   orthogonal components of earthquake ground motion based on response
   spectrum approach,the method of the square root of the sum of squares
   (SRSS) is often used to determine the design earthquake forces.
   Structural members,such as beams or columns are usually under the
   combined action of multi-axial force N and moments M_x and M_y . The
   maximum response of the member under the action of N,M_x M_y and
   evaluated by the SRSS method represents the probable value of each force
   or moment, which forms the surfaces of a hexahedron in the N,M_x and M_y
   space. However,in general, the maximum force and moments do not occur
   simultaneously,the design based on this assumption leads to the
   conservative result. The investigation of Gupta demonstrates that the
   real combination of multi-axial forces forms the surface of a ellipsoid
   inside the hexahedron in the N,M_x and M_y space. And he suggested to
   select several points on the surface of the ellipsoid for the design
   modes of combination of N,M_x and M_y . Based on the personal experience
   in the design practice of architectural structure,the authors carried
   out some research on the trial calculation for the choice of unfavorable
   design modes and the evaluation of most unfavorable earthquake stress
   distribution in the section of structural member under the combined
   action of forces N,M_x and M_y etc. Some deep understanding of the
   problem is obtained.

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