內容大鋼
This book systematically illustrates the dynamic mechanical behaviors and discusses the fundamentals of the constitutive modeling of roller compacted concrete (RCC), influenced by the construction technique and mix design. Four typical problems are analyzed using laboratory tests, numerical simulation, and theoretical analysis, i.e., to illustrate the special dynamic mechanical behaviors of RCC, to reveal the dynamic size-dependence of mechanical properties, to discuss the aggregate size effect on dynamic mechanical properties, and to modify the dynamic constitutive model for RCC. Generally, the constitutive modeling of RCC needs a comprehensive understanding of dynamic size-dependence and aggregate size effect of concrete that coupled with the strain-rate sensitivity. So that, readers can master the modified dynamic constitutive model of RCC to analyze and solve the problems in blastresistance analysis and protective design of RCC dams.
This book can be used as a postgraduate textbook for civil and hydraulic engineering in colleges and universities, and as an elective course for senior undergraduates. It can also be used as a reference for relevant professional scientific researchers and engineers in field of protective design of concrete structures.
目錄
1 Constitutive Relations of RCC: An Overview
1.1 Background
1.2 Literature Review
1.2.1 Dynamic Behaviors and Constitutive Models for Normal Concrete
1.2.2 Special Physical and Mechanical Properties of RCC
1.2.3 Size-Dependence of Concrete Under Dynamic Loads
1.2.4 Aggregate Effect on Mechanical Behaviors of Concrete
References
2 Experimental Research on Dynamic Behaviors of RCC
2.1 Introduction
2.2 Experimental Procedures
2.2.1 Material and RCC Mix Proportion
2.2.2 Specimen Preparation
2.2.3 Quasi-static Testing Results
2.2.4 Reliability Analysis of SHPB Test
2.3 Effect of Construction Technique on Dynamic Behaviors
2.3.1 Dynamic Mechanical Properties
2.3.2 Stratification Effect of RCC on Dynamic Mechanical Properties
2.4 Shock Wave Propagation Across Interlayers in RCC
2.4.1 Experimental Scheme
2.4.2 Incident and Transmitted Waveforms
2.4.3 Reflection and Transmission of Shock Wave Propagation
2.5 Theoretical Analysis on the Shock Wave Propagation
2.5.1 Wave Propagation in Viscoelastic Medium
2.5.2 Wave Attenuation During Propagation Across RCC
2.5.3 Influence of Interlayers on Transmitted Wave
2.6 Summary and Conclusions
References
3 Meso-mechanic-Based Dynamic Behaviors of RCC
3.1 Introduction
3.2 Mesoscopic Simulation Method and Validation
3.2.1 Meso-simulation Method
3.2.2 The Constitutive Model and Parameters of Meso-components
3.2.3 Validation of Numerical Model
3.3 Effect of Maximum Aggregate Size on Dynamic Mechanical Properties of RCC
3.3.1 Two Dimensional Mesoscopic Model
3.3.2 Effect of Aggregate Size on Dynamic Compressive Behaviors
3.3.3 Effect of Aggregate Size on Dynamic Tensile Behaviors
3.4 Influence of Layer Effect on Dynamic Mechanical Properties
3.4.1 The Influence of Layer Effect on Dynamic Compressive Properties
3.4.2 Effect of Layer Effect on Dynamic Tensile Mechanical Properties
3.5 Summary and Conclusions
References
4 Consturction-Induced Damage Effect on Dynamic Compressive Behaviors of RCC
4.1 Introduction
4.2 Specimen Preparation and Damage Quantification
4.2.1 Specimen Preparation
4.2.2 Quantification of the Initial Damage
4.3 Initial Damage Effect on the Dynamic Behaviors of RCC
4.3.1 Mechanical Tests
4.3.2 Initial Damage Effect on Stress- Strain Curves
4.3.3 Initial Damage Effect on Dynamic Mechanical Properties
4.3.4 Statistical Characteristics of Dynamic Compressive Behaviors
4.4 Assessment to the Initial Damage Effect on the Dynamic Behaviors
4.4.1 Correlation Between Initial Damage and Dynamic Behaviors
4.4.2 Evaluation on the Initial Damage from Improper Construction
4.5 Summary and Conclusions
References
5 Dynamic Constitutive Model of RCC for Fully-Graded Dam
5.1 Introduction
5.2 Strength Surface Modification of Fully-Graded RCC
5.2.1 Experimental Study on RCC Triaxial Compression Behaviors
5.2.2 Meso-simulation of Triaxial Compressive Behavior of Fully-Graded RCC
5.2.3 Strength Surface Modification for RCC Constitutive Model
5.3 True Strain-Rate Effect Model of Fully-Graded RCC
5.3.1 True Strain-Rate Effect Decoupling Method
5.3.2 True Strain-Rate Effect on Dynamic Compressive Strength of RCC
5.3.3 True Strain-Rate Effect on Dynamic Tensile Strength of RCC
5.3.4 Distribution Characteristic of Dynamic Compressive Strength
5.4 Modified Weibull Size Effect Law
5.5 Summary and Conclusions
References
6 Fragmentation-Based Dynamic Size Effect of RCC Under Impact Loadings
6.1 Introduction
6.2 Fragment Characteristics of RCC Under Impact Loads
6.2.1 Dynamic Fragmentation Process
6.2.2 Fragment Size Distribution
6.2.3 Relationship Between Fragment Size and Dynamic Behaviors
6.3 Dynamic Size Effect Depicted by Fractal Characteristics
6.4 Fractal Mechanism of Dynamic Size Effect
6.5 Summary and Conclusions
References
7 Dynamic Constitutive Model of RCC for Fully-Graded Dam
7.1 Introduction
7.2 Strength Surface Modification of Fully-Graded RCC
7.2.1 Experimental Study on RCC Triaxial Compression Behaviors
7.2.2 Meso-simulation of Triaxial Compressive Behavior of Fully-Graded RCC
7.2.3 Strength Surface Modification for RCC Constitutive Model
7.3 True Strain-Rate Effect Model of Fully-Graded RCC
7.3.1 True Strain-Rate Effect Decoupling Method
7.3.2 True Strain-Rate Effect on Dynamic Compressive Strength of RCC
7.3.3 True Strain-Rate Effect on Dynamic Tensile Strength of RCC
7.4 Modification of the Damage Equation in the K&C Model
7.5 Validation of Modified Full-Graded RCC Constitutive Model
7.5.1 Validation of Modified K&C Constitutive Model with Single Element Method
7.5.2 Applicability of Modified K&C Constitutive Model in Slab Subjected to Air Explosion
7.6 Summary and Conclusions
References
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