Resumo

VALENZUELA BELTRAN, Federico; RUIZ GOMEZ, Sonia E.; REYES SALAZAR, Alfredo  e  TERAN GILMORE, Amador. Strength amplification factors for the design of structures with asymmetric yielding. Ing. sísm [online]. 2018, n.99, pp.48-81. ISSN 0185-092X.

A reliability-based criterion to estimate strength amplification factors for structures with asymmetric yielding is presented. The methodology involves the calculation of mean annual rates of exceedance of the structural demand of systems with different levels of asymmetric yielding. Simplified mathematical expressions are proposed for different soil conditions of the valley of Mexico. The expressions depend on several factors: the ductility of the structural systems, their level of asymmetric yielding, their fundamental vibration period and the dominant period of the soil. The resultant expressions are compared with those recommended by the Complementary Technical Norms for Earthquake Resistant Design (NTCDS-2004) of the Mexico City Building Code (RCDF-2004), as well as to those specified in the Manual de Obras Civiles: Diseño por Sismo (MOC-2015). Finally, the validity of the proposed expressions is verified with an illustrative example of a 9-story regular reinforced concrete building exhibiting asymmetric yielding produced by tilting. The expressions proposed here were included in Section 2.5 of the new version of the Complementary Technical Norms for Earthquake Resistant Design (NTCDS-2017).

Palavras-chave : structural reliability; asymmetric yielding; seismic design; seismic risk analysis.

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