主余震序列作用下屈曲约束支撑钢框架抗震性能研究

摘要

Recently, there are many papers report thedevelopment of some new buckling-restrained brace frames and the evaluation of its characteristics. At the same time self-centering buckling-restrained brace frames are considered as new solution for the increasing of the structural resilience. In this thesis, the seismic performance of structures are analyzed subjected to earthquake main shock-aftershock sequences.There is comparison of two types of the additional BRB elements, and also there is comparison between them and original steel frame to show the effect of using BRB and SCBRB elements.The main research contents are as follows:⑴Design of buckling-restrained braced frames (BRBF).Including finding characteristics which can provide significant improvement of the behavior of the whole building. The main purpose of using BRB elements is construct lateral load resisting system. If earthquake occurs that system must dissipate energy and it suppose to provide decreasing of the displacements.⑵Seismic performance of BRBF subjected to earthquake main shock-aftershock sequences. Using different main shock-aftershock sequences is important to compare structure behavior subjected different earthquakes. In addition, two types of the distribution of BRB elements was used in calculation.The seismic performance of two BRBFs are compared to steel frame subjected to earthquake main shock-aftershock sequences.Hysteretic curve of the BRB elements shows that some amount of the energy was dissipated during the motion, the seismic responses are reduced with the function of BRBs.⑶Design of self-centering buckling-restrained braced frames (SCBRBF).To compare the effects from BRB and SCBRB elements, the same steel frame was used in calculations. After replacing BRB elements and putting SCBRB elements in the model of the structure, thedesignof self-centering buckling-restrained braced frameswas completed.⑷Seismic performance of SCBRBFsubjected to earthquake main shock-aftershock sequences. To compare the seismic performance of BRBF and SCBRBF, the same main shock-aftershock sequences was used in this part. Because of the flag-shaped hysteretic curve of the SCBRB elements, bigamount of the energy was dissipated during the motion. Compared to steel frame, smaller seismic responses and residual deformation occurred the structure.⑸Comparison of seismic resilience of BRBFs and SCBRBFssubjected to earthquake main shock-aftershock sequences.BRBFs and SCBRBFs can control the seismic responses effectively due to the energy dissipation of BRBs, and SCBRB can also reduce the structural residual deformation. The earthquake aftershock after earthquake main shock can increase the structural damage and enlarge the structural seismic responses.⑹Seismic collapse performance of BRBFs and SCBRBs subjected to earthquake main shock-aftershock sequences.The seismic collapse performance of structures are researchedbased on incremental dynamic analysis.BRBs and SCBRBs can improve the structural seismic collapse performance, the collapse medians of BRBF and SCBRBF are larger than steel frame, the conditional failure probability (fragility) of BRBF and SCBRBF are larger than steel frame. The seismic collapse performance of structures decrease and seismic fragility increase subjected to earthquake main shock-aftershock sequences compared to they are subjected to main earthquake.

目录

Chapter 1:Introduction

1.1 Research background and significance

1.2 Literature Review and Evaluation

1.3 Main research contents

Chapter 2:Seismic Performance of Buckling-Restrained Braced Frames Subjected to Earthquake Main shock-Aftershock Sequences

2.1 Design of buckling-restrained braced frames

2.2 Calibration of structural finite element model

2.3 Seismic performance analysis of buckling-restrained braced frames

2.4 Comparison of seismic performance subjected to earthquake main shock and earthquake main shock-aftershock sequences

2.5 Conclusions

Chapter 3:Seismic Performance of Self-Centering Buckling-Restrained Braced Frames Subjected to Earthquake Main shock-Aftershock Sequences

3.1 Self-centering buckling-restrained braces

3.2 Design of self-centering buckling-restrained braced frames

3.3 Seismic performance analysis of SCBRBF

3.4 Comparison of seismic performance subjected to earthquake main shock and earthquake main shock-aftershock sequences

3.5 Conclusions

Chapter 4:Seismic Сollapse Performance of Buckling-Restrained Braced Frames Subjected to Earthquake Main shock-Aftershock Sequences

4.1Seismic collapse performanceof BRBF

4.2 Seismic collapse performance of SCBRBF

4.3 Comparison of seismic collapse performance

4.4 Comparison of SCBRBF and BRBF with different characteristic

4.4 Conclusions

Conclusions

参考文献

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