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| 1 | THE COMPACTION OF TIME-DEPENDENT VISCOUS GRANULAR MATERIALS CONSIDERING INERTIAL FORCES显示文摘In the present paper, compactions of time-dependent viscous granular materials are simulated step by step using the automatic adaptive mesh generation schemes. Inertial forces of the viscous incompressible aggregates are taken into account. The corresponding conservation equations, the weighted-integral formulations, and penalty finite element model are investigated. The fully discrete finite element equations for the simulation are derived. Polygonal particles of aggregates are simplified as mixed three-node and four-node elements. The automatic adaptive mesh generation schemes include contact detection algorithms, and mesh upgrade schemes. Solutions of the numerical simulation are in good agreement with some results from literatures. With minor modification, the proposed numerical model can be applied in several industries, including the pharmaceutical, ceramic, food, and household product manufacturing. | Yuching Wu Jianzhuang Xiao Cimian Zhu | 2011 | Acta Mechanica Solida Sinica2011，24，6： | 4 |
| 2 | Three-scale stochastic homogenization of elastic recycled aggregate concrete based on nano-indentation digital images显示文摘In this paper,three-scale stochastic elastic finite element analyses are made for recycled aggregate concrete (RAC)based on nano-indentation digital images.The elastic property of RAC contains uncertainties across scales.It has both theoretical and practical values to model and predict its mechanical performance.Based on homogenization theory,effective stochastic elastic moduli of RAC at three different scales are obtained using moving window technique,nano-indentation digital images,and Monte-Carlo method.It involves the generation of a large number of random realizations of microstructure geometry based on different volume fraction of the inclusions and other parameters.The mean value,coefficient of variation and probability distribution of the effective elastic moduli are computed considering the material multiscale structure.The microscopic randomness is taken into account,and correlations of RAC among five phases are investigated.The effective elastic properties are used to obtain the global behavior of a composite structure.It is indicated that the response variability can be considerably affected by replacement percentage of recycled aggregates. | Chen WANG Yuching WU Jianzhuang XIAO | 2018 | Frontiers of Structural and Civil Engineering2018，12，4： | 0 |
| 3 | The effect of micro-structural uncertainties of recycled aggregate concrete on its global stochastic properties via finite pixel-element Monte Carlo simulation显示文摘In this paper,the effect of micro-structural uncertainties of recycled aggregate concrete (RAC)on its global stochastic elastic properties is investigated via finite pixel-element Monte Carlo simulation.Representative RAC models are randomly generated with various distribution of aggregates.Based on homogenization theory,effects of recycled aggregate replacement rate,aggregate volume fraction,the unevenness of old mortar,proportion of old mortar, aggregate size and elastic modulus of aggregates on overall variability of equivalent elastic properties are investigated. Results are in a good agreement with experimental data in literature and finite pixel-element method saves the computation cost.It is indicated that the effect of mesoscopic randomness on global variability of elastic properties is considerable. | Qingpeng MENG Yuching WU Jianzhuang XIAO | 2018 | Frontiers of Structural and Civil Engineering2018，12，4： | 0 |
| 4 | Implementation of total Lagrangian formulation for the elasto-plastic analysis of plane steel frames exposed to fire显示文摘In this paper,the co-rotational total Lagrangian forms of finite element formulations are derived to perform elasto-plastic analysis for plane steel frames that either experience increasing external loading at ambient temperature or constant external loading at elevated temperatures.Geometric nonlinearities and thermal-expansion effects are considered.A series of programs were developed based on these formulations.To verify the accuracy and efficiency of the nonlinear finite element programs,numerical benchmark tests were performed,and the results from these tests are in a good agreement with the literature.The effects of the nonlinear terms of the stiffness matrices on the computational results were investigated in detail.It was also demonstrated that the influence of geometric nonlinearities on the incremental steps of the finite element analysis for plane steel frames in the presence of fire is limited. | Bing XIA Yuching WU Zhanfei HUANG | 2012 | Frontiers of Structural and Civil Engineering2012，6，3： | 0 |
| 5 | Finite element analysis of creep for plane steel frames in fire显示文摘Steel is widely used for the construction of bridges,buildings,towers,and other structures because of its great strength,light weight,ductility,and ease of fabrication,but the cost of fireproofing is a major disadvantage.Therefore,the resistance of a steel structure to fire is a significant subject for modern society.In the past,for simplification,creep behavior was not taken into account in research on the resistance of a steel structure to fire.However,it was demonstrated that the effect of creep is considerable at temperatures that commonly reach 600℃and should not be neglected in this context.In this paper,a co-rotational total Lagrangian finite element formulation is derived,and the corresponding numerical model is developed to study the creep behavior of plane steel frames in fire conditions.The geometric nonlinearity,material nonlinearity,high temperature creep,and temperature rate of change are taken into account.To verify the accuracy and efficiency of the numerical model,four prototypical numerical examples are analyzed using this model,and the results show very good agreement with the solutions in the literature.Next,the numerical model is used to analyze the creep behavior of the plane steel frames under decreasing temperatures.The results indicate that the effect of creep is negligible at temperatures lower than 500℃and is considerable at temperatures higher than 500℃.In addition,the heating rate is a critical factor in the failure point of the steel frames.Furthermore,it is demonstrated that the deflection at the midpoint of the steel beam,considering creep behavior,is approximately 13%larger than for the situation in which creep is ignored.At temperatures higher than 500℃,the deformed steel member may recover approximately 20%of the total deflection.The application of the numerical model proposed in this paper is greatly beneficial to the steel industry for creep analysis,and the numerical results make a significant contribution to the understanding of resistance and protection for steel structures against disastrous fires. | Hui ZHU Yuching WU | 2012 | Frontiers of Structural and Civil Engineering2012，6，3： | 0 |
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