CMES-Vol. 111, No. 4, 2016

Open Access

ARTICLE

A Piecewise Linear Isotropic-Kinematic Hardening Model with Semi-Implicit Rules for Cyclic Loading and Its Parameter Identification
M. Ohsaki¹, T. Miyamura², J. Y. Zhang³
CMES-Computer Modeling in Engineering & Sciences, Vol.111, No.4, pp. 303-333, 2016, DOI:10.3970/cmes.2016.111.303
Abstract A simple constitutive model, called semi-implicit model, for cyclic loading is proposed for steel materials used for structures such as building frames in civil engineering. The constitutive model is implemented in the E-Simulator, which is a software package for large-scale seismic response analysis. The constitutive relation is defined in an algorithmic manner based on the piecewise linear combined isotropic-kinematic hardening. Different rules are used for the first and subsequent loading states to incorporate characteristics such as yield plateau and Bauschinger effect of rolled mild steel materials. An optimization method is also presented for parameter identification More >

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ARTICLE

Structural Damage Detection Using a Modified Artificial Bee Colony Algorithm
H.J. Xu¹, Z.H. Ding¹, Z.R. Lu^1,2, J.K. Liu¹
CMES-Computer Modeling in Engineering & Sciences, Vol.111, No.4, pp. 335-355, 2016, DOI:10.3970/cmes.2016.111.335
Abstract An optimization approach based on Artificial Bee Colony (ABC) algorithm is proposed for structural local damage detection in this study. The objective function for the damage identification problem is established by structural parameters and modal assurance criteria (MAC). The ABC algorithm is presented to solve the certain objective function. Then the Tournament Selection Strategy and chaotic search mechanism is adopted to enhance global search ability of the certain algorithm. A coupled double-beam system is studied as numerical example to illustrate the correctness and efficiency of the propose method. The simulation results show that the modified More >

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ARTICLE

Longitudinal Vibration Analysis of Marine Riser During Installation and Hangoff in Ultra Deepwater
Yanbin Wang¹, Deli Gao¹, Jun Fang¹
CMES-Computer Modeling in Engineering & Sciences, Vol.111, No.4, pp. 357-373, 2016, DOI:10.3970/cmes.2016.111.357
Abstract This paper is concerned with the problem of longitudinal vibration of a 3,000 m long disconnected drilling riser during installation and hangoff operation. The natural frequency, amplitude of vibration displacement and vibration force of longitudinal vibration have been determined with consideration of the damping effect of the sea water. Results show the natural frequency of riser under these two situations are both decrease with the increase of water depth. The natural frequency of riser in installation operation is bigger than that in hangoff operation. The vibration displacement in hangoff configuration is bigger than that in More >

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