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Search Results (5)
  • Open Access

    ARTICLE

    Seismic Analysis of Reinforced Concrete Silos under Far-Field and Near-Fault Earthquakes

    Anwer H. Hussein*, Hussam K. Risan

    Structural Durability & Health Monitoring, Vol.16, No.3, pp. 213-233, 2022, DOI:10.32604/sdhm.2022.018293

    Abstract Silos are strategical structures used to stockpile various types of granular materials. They are highly vulnerable to earthquake excitation and have been frequently reported to fail at a higher rate than any other industrial structure. The seismic response of silos within the near-fault region will suffer a complex combination of loadings due to the unique characteristics of the near-fault ground motions; which are usually associated with a large amplitude pulse at the beginning of either the velocity or the displacement time histories. This study aims to numerically evaluate the seismic response of reinforced concrete cylindrical silos under near-fault ground motions… More >

  • Open Access

    ARTICLE

    An Adaptive Substructure-Based Model Order Reduction Method for Nonlinear Seismic Analysis in OpenSees

    Jian Wang1, 2, Ming Fang3, *, Hui Li1, 2

    CMES-Computer Modeling in Engineering & Sciences, Vol.124, No.1, pp. 79-106, 2020, DOI:10.32604/cmes.2020.09470

    Abstract Structural components may enter an initial-elastic state, a plastic-hardening state and a residual-elastic state during strong seismic excitations. In the residual-elastic state, structural components keep in an unloading/reloading stage that is dominated by a tangent stiffness, thus structural components remain residual deformations but behave in an elastic manner. It has a great potential to make model order reduction for such structural components using the tangent-stiffness-based vibration modes as a reduced order basis. In this paper, an adaptive substructure-based model order reduction method is developed to perform nonlinear seismic analysis for structures that have a priori unknown damage distribution. This method… More >

  • Open Access

    ARTICLE

    Seismic Analysis of the Connections of Buried Segmented Pipes

    Wei Liu1, 2, *, Zhaoyang Song2, Yunchang Wang2

    CMES-Computer Modeling in Engineering & Sciences, Vol.123, No.1, pp. 257-282, 2020, DOI:10.32604/cmes.2020.07220

    Abstract Seismic analysis of buried pipes has been one study focus during the last decades, but the systematic seismic research of pipe connections, especially its relationship with the connected straight pipe, is nearly blank. On the basis, the influence of pipe connections on the joint deformations (JDs) of buried segmented pipes is analyzed in detail by considering different parameters, namely, connection shapes, ground conditions, pipe diameters, branch angles, seismic incident angles, and input ground motions. Moreover, an influence coefficient, which measures the influence of pipe connections on pipe JDs, is calculated. Results show that pipe connections can reduce the JDs of… More >

  • Open Access

    ARTICLE

    A Reduction Algorithm of Contact Problems for Core Seismic Analysis of Fast Breeder Reactors

    Ryuta Imai1, Masatoshi Nakagawa2

    CMES-Computer Modeling in Engineering & Sciences, Vol.84, No.3, pp. 253-282, 2012, DOI:10.3970/cmes.2012.084.253

    Abstract In order to evaluate seismic response of fast breeder reactors, finite element analysis for core vibration with contact/impact is performed so far. However a full model analysis of whole core vibration requires huge calculation times and memory sizes. In this research, we propose an acceleration method of reducing the number of degrees of freedom to be solved until converged for nonlinear contact problems. Furthermore we show a sufficient condition for the algorithm to work well and discuss its efficiency and a generalization of the algorithm. In particular we carry out the full model analysis to show that our method can… More >

  • Open Access

    ARTICLE

    Cracking and Creep Role in Displacements at Constant Load: Concrete Solids in Compression

    E. Ferretti1, A. Di Leo1

    CMC-Computers, Materials & Continua, Vol.7, No.2, pp. 59-80, 2008, DOI:10.3970/cmc.2008.007.059

    Abstract The main assumption on the basis of the identifying model of the effective law, developed by the Author, is the impossibility of considering the specimen as a continuum, when an identifying procedure from load-displacement to stress-strain in uniaxial compression is attempted. Actually, a failure mechanism with propagation of a macro-crack was found to activate from the very beginning of the uniaxial compression test forth. This leads to considering the acquired displacements as composed by two quotes: one constitutive, due to the material strain, and one of crack opening. Since the ratio between these two quotes is not constant during the… More >

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