Deterministic seismic design procedures for reinforced concrete buildings

Paulay, T.

doi:10.1016/0141-0296(83)90044-5

Cited by 17 publications

(3 citation statements)

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“…However, spines are not able to form a story mechanism, resulting in variable higher‐mode force demands in the elastic regions of SBFs and other spine‐like systems. Similar variability also occurs in the moment response of the columns of moment‐resisting frames, which are designed to remain elastic to meet strong column‐weak beam design requirements 32 …”

Section: Force Demandsmentioning

confidence: 87%

“…Similar variability also occurs in the moment response of the columns of momentresisting frames, which are designed to remain elastic to meet strong column-weak beam design requirements. 32 For example, axial force demands in the elastic braces, P s,j , of the strongback can be estimated considering horizontal equilibrium and an arbitrary distribution of lateral forces, f (neglecting column shear and nonlinear geometric effects):…”

Section: Force Demandsmentioning

confidence: 99%

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Higher‐mode force response in multi‐story strongback‐braced frames

Simpson

2020

Earthq Engng Struct Dyn

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Strongback-braced frames employ an essentially elastic steel truss, or strongback, that distributes demands more uniformly to delay or prevent story mechanisms. Because inertial forces are no longer limited by the formation of a story mechanism, strongback-braced frames can exhibit large elastic force demands, particularly in the higher modes. This paper characterizes the higher-mode force response of strongback-braced frames. Four-story archetypes were designed using nonlinear dynamic analyses to incorporate higher-mode force demands into the design process. The response of the archetypes was compared with that of reference buckling-restrained braced frames that were allowed to form story mechanisms. The force demands in the strongback were then described using equivalent-static forces to represent the inertial forces induced by the higher modes. Force demands in the strongback arise from a yielding first-mode 'pivoting' and elastic higher-mode 'bending' response. These higher-mode force demands are elastic, ill-constrained by the strength of the yield mechanism, and depend significantly on the choice of ground motion record used for the analysis. In remaining elastic in the higher modes, the strongback distributes demands more uniformly and mitigates the formation of story mechanisms. Consequently, design and analysis methods for strongback-braced frames need to include estimates for these near-elastic higher-mode force demands.

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Section: Force Demandsmentioning

confidence: 87%

Section: Force Demandsmentioning

confidence: 99%

Higher‐mode force response in multi‐story strongback‐braced frames

Simpson

2020

Earthq Engng Struct Dyn

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show abstract

“…Non-linear dynamic analyses of wall-frame and frameonly structures have showed that the static capacitybased shear force calculated with (12) is amplified due to dynamic effects (Paulay, 1983;Goodsir et al, 1983;Paulay and Goodsir, 1986;Paulay and Priestley, 1992;Paulay, 1996;Priestley et al, 2007). This amplification is related to the dynamic magnification of the flexural moments in the column due to the effect of higher modes of vibration.…”

Section: Dynamic Magnification Of Static Shearmentioning

confidence: 99%