大坝混凝土断裂性能试验与研究(英文版)(精) azw3 极速 下载 snb txt pdf pdb 夸克云

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序I

Preface I

Preface II

Summary

1 Introduction

1.1 Overview

1.2 Fracture Experiments of Tnree Gorges Dam Concrete

1.2.1 Specimens

1.2.2 Materials and mix proportions

1.2.3 Test program

1.2.4 Three-point bending notched beam (TPB) tests

1.2.5 Wedge splitting (WS) test

1.2.6 Direct tension (DT) tests and fundamental mechanical performance tests

2 State-of-the-art Review on Concrete Softening Curve

2.1 Introduction

2.2 Determination Approach of the Tensile Softening Relationships (a-w curves)

of Concrete

2.2.1 Direct tension test method

2.2.2 J-Integral method

2.2.3 Inverse analysis method

2.3 Shape of Softening Curve of Concrete

2.3.1 Linear shape softening curve of concrete

2.3.2 Linear softening curve of concrete

2.4 Conclusions

References

3 Two Methods for Determining Softening Relationships of Dam Concrete andWet-screening

Concrete

3.1 Introduction

3.2 Experiments

3.2.1 Material, mix and specimens preparation

3.2.2 Fracture tests

3.3 Softening Relationships of Dam Concrete and Wet-screened Concrete

Determined by the Direct Tension Tests

3.3.1 Stress-deformation (a-d) curves

3.3.2 Direct tension method for identifying a-w curve

3.3.3 Results of direct tension method

3.4 Softening Relationships Determined by the Inverse Analysis Method

3.4.1 Cracking strength

3.4.2 Inverse analysis method based on the cracking strength criterion

3.4.3 Results of inverse analysis method

3.5 Comparison of Softening Relationships of Dam Concrete and Wet-screening

Concrete

3.5.1 Comparison of Softening Relationship of Dam Concrete and Wet-

Screening Concrete Determined by Direct Tension Method and Inverse

Analysis Method

3.5.2 Comparison of Fracture Energy of Dam Concrete and Wet-Screening

Concrete Determined by WOF Method and TSD Method

3.6 Conclusions

References

4 Prediction of the Tension Softening Curve of Dam Concrete Based on BP Neural

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