CONSEQUENCE OF STRENGTH-DEPENDENT STIFFNESS ON TRADITIONAL SEISMIC DESIGN APPROACH

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DUTTA S.CH.; DAS S.

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Paper Information

Journal: ASIAN JOURNAL OF CIVIL ENGINEERING (BUILDING AND HOUSING) Year:2007 | Volume:8 | Issue:4 Page(s): 405-421

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Information Journal Paper

Title

CONSEQUENCE OF STRENGTH-DEPENDENT STIFFNESS ON TRADITIONAL SEISMIC DESIGN APPROACH

Author(s)

DUTTA S.CH. | DAS S. | Issue Writer Certificate

Keywords

SEISMIC BEHAVIOUR

STRENGTH-DEPENDENT STIFFNESS

INELASTIC RESPONSE

TRADITIONAL SEISMIC DESIGN APPROACH

Abstract

Traditional seismic design approach uses initially assessed natural periods as fixed design parameters for any structural system ignoring its dependency on original strength provided to meet elastic strength demand computed on the basis of such periods, divided by the response reduction factor. This implies the consideration of a constant stiffness obtained due to initial period while a varying yield displacement inversely proportional with response reduction factors. However, a series of recent studies shows that the reality being completely otherwise, the yield displacement of any structural system remains almost constant making assigned strength and hence, resulting stiffness both varying inversely with response reduction factor considered in the design. This reality puts a question mark on the validity of the existing approach. The present paper is a limited effort to resolve this issue. To achieve this end, the strength demand, inelastic displacement demand and ductility demand of a large category of systems encompassing all feasible combinations of lateral period and response reduction factors are computed through both the approaches and compared. While computing the INELASTIC RESPONSE, elasto-plastic as well as various feasible degrading hysteresis behaviours, have been used. The study indicates that the traditional approach yields a safer estimation of the strength and ductility demand except for system with very stiff periods. On the other hand, inelastic displacement demand is underestimated by this traditional approach, which can be by and large compensated by multiplying this displacement demand by response reduction factor.

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APA: Copy

DUTTA, S.CH., & DAS, S.. (2007). CONSEQUENCE OF STRENGTH-DEPENDENT STIFFNESS ON TRADITIONAL SEISMIC DESIGN APPROACH. ASIAN JOURNAL OF CIVIL ENGINEERING (BUILDING AND HOUSING), 8(4), 405-421. SID. https://sid.ir/paper/298742/en

Vancouver: Copy

DUTTA S.CH., DAS S.. CONSEQUENCE OF STRENGTH-DEPENDENT STIFFNESS ON TRADITIONAL SEISMIC DESIGN APPROACH. ASIAN JOURNAL OF CIVIL ENGINEERING (BUILDING AND HOUSING)[Internet]. 2007;8(4):405-421. Available from: https://sid.ir/paper/298742/en

IEEE: Copy

S.CH. DUTTA, and S. DAS, “CONSEQUENCE OF STRENGTH-DEPENDENT STIFFNESS ON TRADITIONAL SEISMIC DESIGN APPROACH,” ASIAN JOURNAL OF CIVIL ENGINEERING (BUILDING AND HOUSING), vol. 8, no. 4, pp. 405–421, 2007, [Online]. Available: https://sid.ir/paper/298742/en

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