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Recent progress of seismic research on tall buildings in China Mainland

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Earthquake Engineering and Engineering Vibration 2014年第S1期13卷 47-61页

作者： lu xilin Jiang Huanjun State Key Laboratory of Disaster Reduction in Civil Engineering Tongji University

As a result of rapid economic growth and urbanization in the past two decades,many tall buildings have been constructed in China Mainland,offering researchers and practitioners an excellent opportunity for research and practice in the field of structural engineering. This paper reviews progress by researchers throughout China Mainland on the seismic research of tall buildings,focusing on three major topics that impact the seismic performance of tall buildings. These are:(1) new types of steel-concrete composite structural members such as steel-concrete composite shear walls and columns,(2) earthquake resilient shear wall structures such as shear walls with replaceable structural components,self-centering shear walls and rocking walls,and(3) performance-based seismic design,including seismic performance index,performance level and design method. The paper concludes by presenting future research needs and directions in this field.

关键词： tall buildings steel-concrete composite member earthquake resilient structure performance-based seismic design

Shake-table testing of a self-centering precast reinforced concrete frame with shear walls

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Earthquake Engineering and Engineering Vibration 2018年第2期17卷 221-233页

作者： lu xilin Yang Boya Zhao Bin State Key Laboratory of Disaster Reduction in Civil Engineering Tongji University

The seismic performance of a self-centering precast reinforced concrete （RC） frame with shear walls was investigated in this paper. The lateral force resistance was provided by self-centering precast RC shear walls （SPCW）, which utilize a combination ofunbonded prestressed post-tensioned （PT） tendons and mild steel reinforcing bars for flexural resistance across base joints. The structures concentrated deformations at the bottom joints and the unbonded PT tendons provided the self-centering restoring force. A 1/3-scale model of a five-story self-centering RC frame with shear walls was designed and tested on a shake-table under a series of bi-directional earthquake excitations with increasing intensity. The acceleration response, roof displacement, inter-story drifts, residual drifts, shear force ratios, hysteresis curves, and local behaviour of the test specimen were analysed and evaluated. The results demonstrated that seismic performance of the test specimen was satisfactory in the plane of the shear wall; however, the structure sustained inter-story drift levels up to 2.45%. Negligible residual drifts were recorded after all applied earthquake excitations. Based on the shake-table test results, it is feasible to apply and popularize a self-centering precast RC frame with shear walls as a structural system in seismic regions.

关键词： self-centering shake-table test RC frame with shear walls precast unbonded post-tensioning seismicperformance

Shake table testing of a multi-tower connected hybrid structure

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Earthquake Engineering and Engineering Vibration 2009年第1期8卷 47-59页

作者： Zhou Ying lu xilin lu Wensheng He Zhijun State Key Laboratory for Disaster Reduction in Civil Engineering Tongji University Shanghai 200092 China Architectural Design and Research Institute Tongii University Shanghai 200092 China

Many single-tower reinforced concrete core wall-steel frame （RCC-SF） buildings have been built in China, but there are no buildings of different-height multi-tower hybrid system. A multi-tower RCC-SF tall building was thus studied because of its structural complexity and irregularity. First, a 1/15 scaled model structure was designed and tested on the shake table under minor, moderate, and major earthquake levels. Then, the dynamic responses of the model structure were interpreted to those of the prototype structure according to the similitude theory. Experimental results demonstrate that, despite the complexity of the structure, the lateral deformation bends as the ＂bending type＂ and the RC core walls contribute more than the steel frames to resist seismic loads. The maximum inter-story drift of the complex building under minor earthquakes is slightly beyond the elastic limitation specified in the Chinese code, and meets code requirements under major earthquakes. From the test results some suggestions are provided that could contribute favorable effect on the seismic behavior and the displacement of the building.

关键词： complex building hybrid structure scaled model shake table testing seismic performance

Experimental study on seismic behavior of circular RC columns strengthened with pre-stressed FRP strips

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Earthquake Engineering and Engineering Vibration 2013年第4期12卷 625-642页

作者： Zhou Changdong lu xilin Li Hui Tian Teng School of Civil Engineering Beijing Jiaotong University State Key Laboratory for Disaster Reduction in Civil Engineering Tongji University

Bonding fiber reinforced polymer （FRP） has been commonly used to improve the seismic behavior of circular reinforced concrete （RC） columns in engineering practice. However, FRP jackets have a significant stress hysteresis effect in this strengthening method, and pre-tensioning the FRP can overcome this problem. This paper presents test results of 25 circular RC columns strengthened with pre-stressed FRP strips under low cyclic loading. The pre-stressing of the FRP strips, types of FRP strips and longitudinal reinforcement, axial load ratio, pre-damage degree and surface treatments of the specimens are considered as the primary factors in the tests. According to the failure modes and hysteresis curves of the specimens, these factors are analyzed to investigate their effect on bearing capacity, ductility, hysteretic behavior, energy dissipation capacity and other important seismic behaviors. The results show that the initial lateral confined stress provided by pre-stressed FRP strips can effectively inhibit the emergence and development of diagonal shear cracks, and change the failure modes of specimens from brittle shear failure to bending or bending-shear failure with better ductility. As a result, the bearing capacity, ductility, energy dissipation capacity and deformation capacity of the strengthened specimens are all significantly improved.

关键词： experimental study circular reinforced concrete column pre-stress fiber reinforced polymer axial loadratio seismic behavior active confinement

Study on the effect of the infill walls on the seismic performance of a reinforced concrete frame

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Earthquake Engineering and Engineering Vibration 2011年第4期10卷 507-517页

作者： Zhang Cuiqiang Zhou Ying Zhou Deyuan lu xilin Research Institute of Structural Engineering and Disaster Reduction Tongji University Shanghai 200092 China State Key Laboratory of Disaster Reduction in Civil Engineering Tongji University Shanghai 200092 China

Motivated by the seismic damage observed to reinforced concrete （RC） frame structures during the Wenchuan earthquake, the effect of infill walls on the seismic performance of a RC frame is studied in this paper. Infill walls, especially those made of masonry, offer some amount of stiffness and strength. Therefore, the effect of infill walls should be considered during the design of RC frames. In this study, an analysis of the recorded ground motion in the Wenehuan earthquake is performed. Then, a numerical model is developed to simulate the infill walls. Finally, nonlinear dynamic analysis is carried out on a RC frame with and without infill walls, respectively, by using CANNY software. Through a comparative analysis, the following conclusions can be drawn. The failure mode of the frame with infill walls is in accordance with the seismic damage failure pattern, which is strong beam and weak column mode. This indicates that the infill walls change the failure pattern of the frame, and it is necessary to consider them in the seismic design of the RC frame. The numerical model presented in this paper can effectively simulate the effect of infill walls on the RC frame.

关键词： infill walls RC frame structure strong column and weak beam strong beam and weak column nonlinear time history analysis

Hidden symmetry operators for asymmetric generalized quantum Rabi models

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Chinese Physics B 2022年第1期31卷 320-323页

作者： xilin lu Zi-Min Li Vladimir V Mangazeev Murray T Batchelor Department of Theoretical Physics Research School of PhysicsAustralian National UniversityCanberra ACT 2601Australia Mathematical Sciences Institute Australian National UniversityCanberra ACT 2601Australia Centre for Modern Physics Chongqing UniversityChongqing 40444China

The hidden Z2 symmetry of the asymmetric quantum Rabi model(AQRM)has recently been revealed via a systematic construction of the underlying symmetry *** on the AQRM result,we propose an ansatz for the general form of the symmetry operators for AQRM-related *** this ansatz we obtain the symmetry operator for three models:the anisotropic AQRM,the asymmetric Rabi–Stark model(ARSM),and the anisotropic ARSM.

关键词： light-matter interaction hidden symmetry asymmetric quantum Rabi model asymmetric Rabi-Stark model

Numerical simulation and analysis for collapse responses of RC frame structures under earthquake

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Frontiers of Structural and Civil Engineering 2009年第4期3卷 364-369页

作者： Fuwen ZHANG xilin lu Chao YIN State Key Laboratory for Disaster Reduction in Civil Engineering Tongji UniversityShanghai 200092China

In this paper,a discrete element model for collapse simulation of RC frame structure is constructed by discretizing the structure into a few elements and spring *** model introduces special hysteretic models of connected springs for arbitrary loading path and also takes into account reasonable failure criteria for springs considering coupling effect of shear and axial *** on the discrete element model,a computer program is developed to simulate the whole process of RC frame structures from initial state to collapse under ***,the contact-impact problem between discrete elements has been treated with effective ***,the program is employed to study the collapse mechanism of a real building in Wenchuan earthquake-hit area;the result of which shows that the simulation program developed based on the new model can realistically simulate the seismic collapse process of RC frame structures.

关键词： discrete element method failure criteria contact-impact simulation program

Shear-critical reinforced concrete columns under various loading rates

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Frontiers of Structural and Civil Engineering 2014年第4期8卷 362-372页

作者： Witarto WITARTO Liang lu Rachel Howser ROBERTS Y. L. MO xilin lu Department of Civil and Environmental Engineering University of Houston Houston TX 77004 USA College of Civil Engineering Tongji University Shanghai 200092 China Energo Engineering A KBR Company Houston TX 77002 USA

This paper presents an experimental study of shear-governed reinforced concrete columns subjected to different loading rates. Four typical short columns were tested cyclically with loading rate of 0.05, 1, 3, and 5 Hz, simulating seismic load. Test result indicated that the loading rate does not affect the column behavior when the rate is up to 5 Hz. Furthermore, Carbon Nano-Fiber Aggregates （CNFAs） were utilized as internal sensors to detect the damage in the column. The test result shows that the CNFAs work well sensing the structural behavior. The CNFA output was further quantitatively correlated to the structural damage level. Finally, a finite element analytical model was constructed to describe the behavior of short columns with shear failure. The analytical model successfully modeled the cyclic loading test results.

关键词： reinforced concrete columns shear failure loading rate Carbon Nano-Fiber Aggregates (CNFAs) finite element analysis OpenSees

Full-Ring Experimental Study of the Lining Structure of Shanghai Changjiang Tunnel

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Journal of Civil Engineering and Architecture 2011年第8期5卷 732-739页

作者： Liang lu xilin lu Peifang Fan Research Institute of Structural Engineering and Disaster Reduction Tong/i University Shanghai 200092 China

Shanghai Changjiang Tunnel, 15 m in diameter, is one of the world＇s largest shield-driven tunnels in diameter. Tongji University has recently carried out a test on the full-scale three-ring lining structure of Changjiang Tunnel. This paper introduces the testing processes, including loading apparatuses, test contents, test cases, etc., and makes comparison with other shield lining structure tests conducted before, and finally gives some evaluations on the design of the tunnel.

关键词： Shield-driven tunnel lining structure full-scale test load apparatus.