Abstract
This paper gives the background to the seismic torsional provisions of the New Zealand Loadings Code. These provisions attempt to deal with three effects: accidental eccentricity, torsional ground motion, and coupling between torsional and translational modes. The first two effects lead to an effective eccentricity of one-tenth of the width of a building, while the third leads to a parabolic function of the calculated eccentricity: this was obtained by applying existing results for torsional amplification to a number of typical building structures.
Highlights
INTRODUCTIONThe SEAOC Code says 'Provisions shall be made to define a 'reasonably regular made for the increase in shear resulting building' with precision: it should be from the horizontal torsion due to an obvious if a building is a 1 highly eccentricity between the centre of mass and irregular structure', otherwise the engineer the centre of rigidity.[1] This has a minimum must use his own judgement
Background to the FormulaeThe static provisions of the code stemmed originally from a suggestion by Newmark and Rosenblueth that within certain limits, a static analysis could be based on the relations e-a, = 1.5e s + ab or e-aj = es - ab where a is the order 0.05 to 0.10
The SEAOC Code says 'Provisions shall be made to define a 'reasonably regular made for the increase in shear resulting building' with precision: it should be from the horizontal torsion due to an obvious if a building is a 1 highly eccentricity between the centre of mass and irregular structure', otherwise the engineer the centre of rigidity.[1]
Summary
The SEAOC Code says 'Provisions shall be made to define a 'reasonably regular made for the increase in shear resulting building' with precision: it should be from the horizontal torsion due to an obvious if a building is a 1 highly eccentricity between the centre of mass and irregular structure', otherwise the engineer the centre of rigidity.[1] This has a minimum must use his own judgement. Joints should be provided any case, the applicability of a to separate the various blocks of the static approach is limited, dynamic methods structure.[1] An adequate static design will not necessarily give a wholly trustapproach is not given, and neither is worthy result: torsional effects are so mention made of the possibility of torsional uncertain that even a full 3-dimensional column failure. Note that the old restriction of NZS 1900 Chapt. 8, that torsional effects may not be used to reduce shear at any point, is no longer in the code
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