Calibration of Finn Model and UBCSAND Model for Simplified Liquefaction Analysis Procedures

Soil-liquefaction-related hazards can damage structures or lead to an extensive loss of life and property. Therefore, the stability and safety of structures against soil liquefaction are essential for evaluation in earthquake design. In practice, the simplified liquefaction analysis procedure associated with numerical simulation analysis is the most used approach for evaluating the behavior of structures or the effectiveness of mitigation plans. First, the occurrence of soil liquefaction is evaluated using the simplified procedure. If soil liquefaction occurs, the resulting structural damage or the following mitigation plan is evaluated using the numerical simulation analysis. Rational and comparable evaluation results between the simplified liquefaction analysis procedure and the numerical simulation analysis are achieved by ensuring that the liquefaction constitutive model used in the numerical simulation has a consistent liquefaction resistance with the simplified liquefaction analysis procedure. In this study, two frequently used liquefaction constitutive models (Finn model and UBCSAND model) were calibrated by fitting the liquefaction triggering curves of most used simplified liquefaction analysis procedures (NCEER, HBF, JRA96, and T-Y procedures) in Taiwan via FLAC program. In addition, the responses of two calibrated models were compared and discussed to provide guidelines for selecting an appropriate liquefaction constitutive model in future projects.

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The Parameter Sensitivity Analysis of the Externally Prestressed Composite Beam

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.243-249.2027 ◽

2011 ◽

Vol 243-249 ◽

pp. 2027-2032

Author(s):

Jin Li ◽

Bei Sun ◽

Qing Ning Li ◽

Long Li

Keyword(s):

Numerical Simulation ◽

Constitutive Model ◽

Composite Beam ◽

Numerical Models ◽

Constitutive Models ◽

Steel Beam ◽

Parameter Sensitivity Analysis ◽

Gaussian Integration ◽

Bending Behavior ◽

Beam Section

This paper used the OpenSees[1] to simulate an externally prestressed composite beam, by contrasting the experimental results to explore the factors that affect the accuracy of the numerical simulation. The different numerical models are constituted with the different material constitutive models in this paper, with the different section fiber division and other factors. We can consider the method of a part of combination beam section which is connecting with shear rivets. The results show that the different concrete constitutive model and the hardening of the steel constitutive model are the important factors of the accuracy of model, and the Gaussian integration points have 3~5 are bitterly for the simulate mode. This study can provide a theoretical basis for the externally prestressed composite beam’s bending behavior of steel beam section’s numerical simulation with the fiber model.

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Study of Soil Liquefaction Analysis Based on the P-Z Model

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.438-439.1185 ◽

2013 ◽

Vol 438-439 ◽

pp. 1185-1189

Author(s):

Hong Yang Zhang ◽

Xian Qi Zhang ◽

Meng Yao ◽

Liang Yao

Keyword(s):

Stability Analysis ◽

Constitutive Models ◽

Soil Liquefaction ◽

The Other ◽

Seismic Stability ◽

Interface Conditions ◽

Two Phase ◽

Dissipation Process ◽

Embankment Dams ◽

Liquefaction Analysis

Dynamic constitutive models and liquefaction characteristics of soil are critical in the seismic stability analysis on embankment dams. The P-Z constitutive model, which is a kind of the multi-mechanism plastic model based on generalized plasticity, is mainly introduced in this paper. Considering soil as two-phase media, based on the Biot fluctuation theory and the P-Z model, the dynamic analysis formulation of two-phase media is established, and the criterion of soil liquefaction is proposed through investigations, where the generation and dissipation process of soil pore pressure and the variations of effective stress are taken into account. Furthermore, the interface conditions between two-phase media and the other types of medium are derived and the examples of verification are presented.

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Numerical Simulation Analysis on Shrinkage and Porosity of ZL101A Alloy Mechanism Box

Materials Science Forum ◽

10.4028/www.scientific.net/msf.704-705.28 ◽

2011 ◽

Vol 704-705 ◽

pp. 28-32

Author(s):

Yan Jun Zhou ◽

Ke Xing Song ◽

Yan Min Zhang ◽

Xiu Hua Guo

Keyword(s):

Numerical Simulation ◽

Simulation Analysis ◽

Solidification Process ◽

Casting Process ◽

Shrinkage Porosity ◽

Analysis Procedure ◽

Liquid Distribution ◽

Gravity Casting ◽

Porosity Defects

The Shrinkage and porosity of ZL101A alloy mechanism box prepared by sand gravity casting process was investigated. The solidification process was simulation analysis by using InteCAST software and the original casting process was optimized based on the above simulated results. The results showed that the shrinkage and porosity defects’ position of ZL101A alloy mechanism box were accurately predicted by the analysis procedure which was from liquid distribution to shrinkage formation and then to Niyama shrinkage porosity. The shrinkage and porosity of the ZL101A alloy mechanism box prepared by optimized process were clearly reduced and the distribution of them was reasonable. Keywords: InteCAST software;ZL101A; Mechanism box; Shrinkage and porosity; Numerical simulation

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Tensile Test of Shape Memory Alloys and Numerical Simulation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.710.13 ◽

2013 ◽

Vol 710 ◽

pp. 13-16

Author(s):

Ping Guan ◽

Yan Zhang ◽

Di Cui

Keyword(s):

Numerical Simulation ◽

Comparative Analysis ◽

Shape Memory Alloy ◽

Constitutive Model ◽

Tensile Test ◽

Shape Memory ◽

Constitutive Models ◽

Pullout Test ◽

Simulation Software ◽

Analysis Of Results

Shape memory alloy (SMA) as an effective alternative to steel has received much attention. The constitutive model of SMA has raped developed for nearly 10 years, such as Boyd and Lagoudas model, Auricchio model, etc. However, a number of constitutive models were more complex, and not easily applied to engineering. In order to study SMA concrete pullout test using numerical simulation software, the tensile property of superelastic SMA was studied in this paper, different units (SOLID185 and LINK8) were simulated at the same time. Through the comparative analysis of results of different constitutive models, an easier used constitutive model of SMA was obtained. Combining with the numerical case, it shows that link8 is more convenient and accurate to simulates SMA.

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Numerical Simulation of the Interaction between Fibre Concrete Slab and Subsoil—The Impact of Selected Determining Factors

Sustainability ◽

10.3390/su122310036 ◽

2020 ◽

Vol 12 (23) ◽

pp. 10036

Author(s):

Lukas Duris ◽

Eva Hrubesova

Keyword(s):

Numerical Simulation ◽

Numerical Modelling ◽

Constitutive Model ◽

Concrete Slab ◽

Constitutive Models ◽

Numerical Results ◽

Deflection Curve ◽

Interface Elements ◽

Fibre Concrete ◽

Vertical Displacements

Shape and material optimization of building structures, including reducing the amount of concrete used, are very important aspects in sustainable construction. Numerical modelling is currently used very effectively to design optimized and sustainable structures, including their interaction with the surrounding rock environment. This paper is focused on the three selected factors of numerical modelling of fibre concrete slab and subsoil interaction: (1) the constitutive model of fibre concrete slab, (2) deformational and strength characteristics of subsoil, (3) effect of interface elements. The specialized geotechnical software Midas GTS NX, based on the finite element method, was used for the modelling of this task. Numerical results were compared with the experimental measurement of vertical displacements on the upper surface of slab. In the presented study, three constitutive models of slab recommended in MIDAS GTS NX code for modelling concrete behaviour (elastic, Mohr-Coulomb and Drucker-Prager) were applied. In addition, the sensitivity analysis with respect to the deformational and strength characteristics of subsoil was performed. The numerical study also presents the effect of the interface elements application on the slab behaviour. The numerical results of maximum vertical displacements based on the Drucker-Prager and elastic model underestimated both the experimental results and numerical results based on the Mohr-Coulomb model. From the qualitative point of view (shape of deflection curve), the numerical simulation showed the better agreement of the Mohr-Coulomb constitutive model with the experimental measurements in comparison with the other two investigated constitutive models. The performed parametric study documented that reduction of the strength and deformational characteristics of subsoil leads to the increase of maximum vertical displacements in the centre of slab, but the experimentally measured deflection curve, including uplift of slab and gapping occurrence between the slab and subsoil, was not achieved without the interface application.

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Load Capacity and Displacement of Recycled Concrete and Self-Insulation Block Masonry Wall

Materials ◽

10.3390/ma13040863 ◽

2020 ◽

Vol 13 (4) ◽

pp. 863 ◽

Cited By ~ 1

Author(s):

Huizhi Zhang ◽

Jifeng Liu ◽

Yang Yue ◽

Xiuqin Cui ◽

Yuezong Lian

Keyword(s):

Numerical Simulation ◽

Compressive Strength ◽

Constitutive Model ◽

Simulation Analysis ◽

Load Capacity ◽

Engineering Application ◽

Experimental Tests ◽

Recycled Concrete ◽

Strength Increase ◽

Selection Of

In order to discuss the load capacity and displacement of masonry constructed with recycled concrete and self-insulation blocks, one type of 10.6 MPa compressive strength block and three kinds of mortar with M15, M10, and M5 compressive strengths are selected. The constitutive model and corresponding parameters selection of different materials in the ABAQUS numerical simulation are analyzed, and the numerical simulation analysis and experimental tests of the load capacity and displacement of masonry constructed with mortars of different strengths are carried out. The results show that masonry compression failure is controlled by the mortar or block that has the lower compressive strength. The displacement of masonry increases with the mortar compressive strength increase, and the higher mortar compressive strength is beneficial for improving the load capacity and displacement of masonry. Reasonable selection of the constitutive model and parameters will help to obtain reasonable results for the ABAQUS numerical simulation. Construction quality and loading method will affect the load capacity and displacement of the masonry. The above conclusion can provide reference for the engineering application of recycled concrete and self-insulation blocks.

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