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学者姓名：唐贞云
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Abstract ：
The rational approximation is an important tool for establishing a dynamic analysis model in time domain for semi-infinite water and soil. It accurately represents the interaction between the semi-infinite medium and an engineering structure. Current research on rational approximation method focuses mainly on the establishment of time-domain analysis models. However, the stability, accuracy, and calculation efficiency of the rational approximation model cannot be guaranteed simultaneously. Based on linear system control theory, this work decomposes the continuous-time rational approximation (CRA) and the discrete-time rational approximation (DRA) into a combination of first- and second-order subsystems, and the stability boundaries for the identified parameters are established according to the stability conditions of each subsystem. A genetic algorithm and a sequential quadratic programming algorithm are used to construct a parameter identification method that can ensure stability in the time domain. Through parameter identification of complex frequency response functions, it is demonstrated that the method proposed in this work can guarantee the stability and accuracy simultaneously, and the calculation efficiency is also substantially improved over that of the existing methods.
Keyword ：
semi-infinite medium semi-infinite medium rational approximation rational approximation parameter identification parameter identification accuracy accuracy stability stability
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| GB/T 7714 | Tang, Zhenyun , Li, Xin , Wang, Zhiyu . Stable parameters identification for rational approximation of Single degree of freedom frequency response function of semi-infinite medium [J]. | INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING , 2023 , 124 (24) : 5596-5615 . |
| MLA | Tang, Zhenyun 等. "Stable parameters identification for rational approximation of Single degree of freedom frequency response function of semi-infinite medium" . | INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING 124 . 24 (2023) : 5596-5615 . |
| APA | Tang, Zhenyun , Li, Xin , Wang, Zhiyu . Stable parameters identification for rational approximation of Single degree of freedom frequency response function of semi-infinite medium . | INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING , 2023 , 124 (24) , 5596-5615 . |
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Abstract ：
To avoid the brittle failure of low aspect ratio shear walls, a novel hollow-core precast shear wall (HCPSW) with boundary elements is proposed. HCPSW has good collapse resistance and higher out-of-plane lateral resistance compared to a solid shear wall with the same concrete consumption. In this study, the effects of the axial load ratio and horizontal reinforcement on the seismic behavior of HCPSW with low aspect ratios were investigated through eight tests of full-scale shear walls under vertical and lateral loads. The results show that the HCPSW with a low aspect ratio under an axial load ratio in the range of 0.2-0.6 formed the damage development process from the hollow core to other areas of the wall panel, thus avoiding the brittle failure of the overall shear failure. The proposed shear walls consume the seismic energy through concrete cracking along the hollow core. Therefore, the higher the axial load ratio, the higher the energy dissipation capacity because of a larger damage area in the hollow core. Increasing the diameter of the horizontal reinforcement effectively improved the bearing capacity of the specimen and reduced the residual deformation. A numerical model with high accuracy was established to simulate the seismic behavior of the HCPSW and perform parametric studies.
Keyword ：
Seismic behavior Seismic behavior Axial load ratio Axial load ratio Precast hollow -core wall Precast hollow -core wall Numerical model Numerical model Low aspect ratio Low aspect ratio
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| GB/T 7714 | Li, Yanna , Li, Zhenbao , Tang, Zhenyun et al. Cyclic behavior of hollow-core precast shear walls subjected to different axial loads [J]. | ENGINEERING STRUCTURES , 2023 , 276 . |
| MLA | Li, Yanna et al. "Cyclic behavior of hollow-core precast shear walls subjected to different axial loads" . | ENGINEERING STRUCTURES 276 (2023) . |
| APA | Li, Yanna , Li, Zhenbao , Tang, Zhenyun , Xu, Liangyu , Wang, Wei , Yang, Xiaohong et al. Cyclic behavior of hollow-core precast shear walls subjected to different axial loads . | ENGINEERING STRUCTURES , 2023 , 276 . |
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Abstract ：
A novel reinforced concrete hollow-core precast shear wall (HCPSW), including a precast hollow core wall panel and cast-in-situ boundary elements is proposed in this study with two anti-seismic defence lines. To analyse the seismic behaviour of this wall, six full-scale specimens were tested under cyclic loading, including two types of HCPSWs with different reinforcements in the boundary elements and one group of solid shear walls for comparison. The test results indicated that the solid shear wall fractured suddenly along the inclined section after the peak load. In contrast, the HCPSW had one more damage evolution stage from the peak load to the ultimate load and could still support the vertical load by boundary elements after achieving the ultimate lateral load. The lateral bearing capacity of the HCPSW specimens was mainly determined by the shear behaviour of the precast wall panel. At the same concrete dosages, the HCPSWs had a comparable lateral bearing capacity and better energy dissipation than the walls with a solid section. To calculate the lateral bearing capacity of this novel wall, a theoretical calculation method based on the softened strut-and-tie model was developed, which had good prediction accuracy for the tested specimens.
Keyword ：
Strut-and-tie model Strut-and-tie model Seismic behaviour Seismic behaviour Full-scale experiment Full-scale experiment Hollow-core precast wall Hollow-core precast wall Boundary element Boundary element
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| GB/T 7714 | Li, Yanna , Li, Zhenbao , Tang, Zhenyun et al. Seismic behaviour of a novel hollow-core precast shear wall with cast-in-situ boundary elements [J]. | JOURNAL OF BUILDING ENGINEERING , 2022 , 52 . |
| MLA | Li, Yanna et al. "Seismic behaviour of a novel hollow-core precast shear wall with cast-in-situ boundary elements" . | JOURNAL OF BUILDING ENGINEERING 52 (2022) . |
| APA | Li, Yanna , Li, Zhenbao , Tang, Zhenyun , Xu, Liangyu , Wang, Wei , Yang, Xiaohong et al. Seismic behaviour of a novel hollow-core precast shear wall with cast-in-situ boundary elements . | JOURNAL OF BUILDING ENGINEERING , 2022 , 52 . |
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Abstract ：
Tuned liquid damper (TLD) is a typical passive device to control structural response under wind and earthquake excitation. At present, TLD is often used to control single-mode of structure. Hence, the design theory of TLD is often based on single-degree of freedom (SDOF) system in frequency domain, which is hard to accurately evaluate seismic performance of TLD-installed multi-degree of freedoms (MDOFs) with consideration of higher mode. In this work, a frequency domain transfer function for TLD controlled MDOFs system is established through the concept of substructure to evaluate overall seismic performance of TLD-installed MDOFs. The accuracy of the transfer function is verified by real-time hybrid testing. Using this transfer function, the effect of TLD on the seismic performance of MDOFs was discussed in frequency domain by parametric analysis. The analytical results indicated that, based on the design theory for single-mode, the TLD with large mass ratio cannot enhance the seismic performance effectively comparing with small mass ratio. In order to improve the control efficiency of relatively large mass TLD, a design method for multi-mode control is established based on the developed frequency domain transfer function. The simulation results showed that, with same TLD mass, the multi-mode method performed smaller structural acceleration response and similar displacement response relative to the single mode method.
Keyword ：
Multi-degree of freedoms Multi-degree of freedoms Seismic performance Seismic performance Frequency domain analysis Frequency domain analysis Tuned liquid damper Tuned liquid damper Multi-mode control Multi-mode control
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| GB/T 7714 | Tang, Zhenyun , Dong, Yue , Liu, Hao et al. Frequency domain analysis method of tuned liquid damper controlled multi-degree of freedoms system subject to earthquake excitation [J]. | JOURNAL OF BUILDING ENGINEERING , 2022 , 48 . |
| MLA | Tang, Zhenyun et al. "Frequency domain analysis method of tuned liquid damper controlled multi-degree of freedoms system subject to earthquake excitation" . | JOURNAL OF BUILDING ENGINEERING 48 (2022) . |
| APA | Tang, Zhenyun , Dong, Yue , Liu, Hao , Li, Zhenbao . Frequency domain analysis method of tuned liquid damper controlled multi-degree of freedoms system subject to earthquake excitation . | JOURNAL OF BUILDING ENGINEERING , 2022 , 48 . |
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Abstract ：
Variable curvature friction pendulum bearings (VCFPB) effectively reduce the dynamic response of storage tanks induced by earthquakes. Shaking table testing is used to assess the seismic performance of VCFPB isolated storage tanks. However, the vertical pressure and friction coefficient of the scaled VCFPB in the shaking table tests cannot match the equivalent values of these parameters in the prototype. To avoid this drawback, a real-time hybrid simulation (RTHS) test was developed. Using RTHS testing, a 1/8 scaled tank isolated by VCFPB was tested. The experimental results showed that the displacement dynamic magnification factor of VCFPB, peak reduction factors of the acceleration, shear force, and overturning moment at bottom of the tank, were negative exponential functions of the ratio of peak ground acceleration (PGA) and friction coefficient. The peak reduction factors of displacement, acceleration, force and overturning moment, which were obtained from the experimental results, are compared with those calculated by the Housner model. It can be concluded that the Housner model is applicable in estimation of the acceleration, shear force, and overturning moment of liquid storage tank, but not for the sliding displacement of VCFPBs.
Keyword ：
real-time hybrid simulation test real-time hybrid simulation test variable curvature friction pendulum bearing variable curvature friction pendulum bearing seismic performance seismic performance base isolation base isolation liquid storage tank liquid storage tank
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| GB/T 7714 | Hong Yue , Tang Zhenyun , Li Zhenbao et al. Seismic performance evaluation of VCFPB isolated storage tank using real-time hybrid simulation [J]. | EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION , 2022 , 21 (2) : 501-515 . |
| MLA | Hong Yue et al. "Seismic performance evaluation of VCFPB isolated storage tank using real-time hybrid simulation" . | EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION 21 . 2 (2022) : 501-515 . |
| APA | Hong Yue , Tang Zhenyun , Li Zhenbao , Du Xiuli . Seismic performance evaluation of VCFPB isolated storage tank using real-time hybrid simulation . | EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION , 2022 , 21 (2) , 501-515 . |
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Abstract ：
Stability prediction is a key step to implement a real-time hybrid simulation (RTHS) testing successfully. There are two kinds of stability prediction methods based on continuous and discrete transfer function. In the family of continuous transfer function based methods, the numerical and physical substructures are seen as continuous systems together with loading system. In discrete family, all subsystems in RTHS are regarded as discrete systems. Actually, in a real RTHS, the numerical substructure is discrete; the physical substructure is continuous. Meanwhile, the signal coordination is needed to balance the sampling interval between numerical solution and physical loading, which is ignored in the reported methods. In order to predict the stability of RTHS system more accurately, this work develops a discrete-continuous stability analysis method through the concept of gain margin, which can consider the performance of numerical substructure, physical substructure, loading system and signal coordination comprehensively. And the accuracy of the method is verified by SIMULINK simulation and experimental testing. Based on shaking table and actuator RTHS systems, the performance of continuous and discrete methods is compared with the proposed method analytically. The results show that the discrete method and continuous method have slight influence on the stability prediction with a small integration step (e.g 1 ms). However, with the increase of integration step, compared with the discrete-continuous method, the discrete method and continuous method may overestimate or underestimate the stability of a real RTHS system.
Keyword ：
Stability analysis Stability analysis Gain margin Gain margin Signal coordination Signal coordination Real-time hybrid simulation (RTHS) Real-time hybrid simulation (RTHS) Discrete-continuous method Discrete-continuous method
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| GB/T 7714 | Hong, Yue , Tang, Zhenyun , Liu, Hao et al. Gain-margin based discrete-continuous method for the stability analysis of real-time hybrid simulation systems [J]. | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2021 , 148 . |
| MLA | Hong, Yue et al. "Gain-margin based discrete-continuous method for the stability analysis of real-time hybrid simulation systems" . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING 148 (2021) . |
| APA | Hong, Yue , Tang, Zhenyun , Liu, Hao , Li, Zhenbao , Du, Xiuli . Gain-margin based discrete-continuous method for the stability analysis of real-time hybrid simulation systems . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2021 , 148 . |
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Abstract ：
Statistic and theory based methods are mainly used for predicting earthquake input energy. Statistical energy spectrum methods need abundant time-history simulation and are lack of solid theoretical basis, while theoretical prediction methods are derived from structural dynamics with necessary assumptions, so that these methods have relatively low accuracy resulted from their assumptions. In this work the comparison of simulation and analysis showed that, due to the influence of structural transient response ignored by existing theoretical prediction methods, more than 40% errors exist in prediction of earthquake input energy for structures with low damping ratio and long period. Based on Fourier decomposition, a new theoretical method was proposed for earthquake input energy prediction considering the influence of transient response. The comparative analysis show that the proposed method significantly improves prediction accuracy of earthquake input energy. © 2021 Elsevier Ltd
Keyword ：
Structural dynamics Structural dynamics Earthquakes Earthquakes Transient analysis Transient analysis Forecasting Forecasting
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| GB/T 7714 | Liu, Hao , Tang, Zhenyun , Chen, Yanjiang . Earthquake input energy prediction considering structural transient response [J]. | Soil Dynamics and Earthquake Engineering , 2021 , 144 . |
| MLA | Liu, Hao et al. "Earthquake input energy prediction considering structural transient response" . | Soil Dynamics and Earthquake Engineering 144 (2021) . |
| APA | Liu, Hao , Tang, Zhenyun , Chen, Yanjiang . Earthquake input energy prediction considering structural transient response . | Soil Dynamics and Earthquake Engineering , 2021 , 144 . |
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Abstract ：
Real-time dynamic hybrid testing (RTDHT) is a state-of-the-art experimental technique for evaluating the performance of a structural system subjected to time-varying loads. Because of the superiority of shaking table for testing rate-dependent and inertial effect existing in structural system, shaking table-based RTDHT is an important branch in RTDHT family, in which shaking table is used to impose inertial forces on physical substructure. Owing to the mass of the seismic platform, shaking table has a relatively narrow testing bandwidth akin to a stand-alone actuator RTDHT system. Furthermore, structure-table interaction confines the physical substructure to a very small mass and linear stage, such that shaking table-based RTDHT is unable to test the structural performance with consideration of high frequency input or non-linearity using large-scale physical substructure. Actually, this is why we develop RTDHT. In this work, a control strategy namedfull state control via simulation(FSCS) was proposed to extend the testing capacity of shaking table-based RTDHT. The efficiency of FSCS-controlled RTDHT for testing high frequency and non-linear structural performance was verified by a small- and large-scale shaking table-based RTDHT, respectively.
Keyword ：
shaking table shaking table full state control full state control system control via simulation system control via simulation real-time dynamic hybrid testing real-time dynamic hybrid testing non-linearity non-linearity
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| GB/T 7714 | Tang, Zhenyun , Dietz, Matt , Hong, Yue et al. Performance extension of shaking table-based real-time dynamic hybrid testing through full state control via simulation [J]. | STRUCTURAL CONTROL & HEALTH MONITORING , 2020 , 27 (10) . |
| MLA | Tang, Zhenyun et al. "Performance extension of shaking table-based real-time dynamic hybrid testing through full state control via simulation" . | STRUCTURAL CONTROL & HEALTH MONITORING 27 . 10 (2020) . |
| APA | Tang, Zhenyun , Dietz, Matt , Hong, Yue , Li, Zhenbao . Performance extension of shaking table-based real-time dynamic hybrid testing through full state control via simulation . | STRUCTURAL CONTROL & HEALTH MONITORING , 2020 , 27 (10) . |
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Abstract ：
Combining the advantages of numerical simulation with experimental testing, real-time dynamic substructure (RTDS) testing provides a new experimental method for the investigation of engineered structures. However, not all unmodeled parts can be physically tested, as testing is often limited by the capacity of the test facility. Model updating is a good option to improve the modeling accuracy for numerical substructures in RTDS. In this study, a model updating method is introduced, which has great performance in describing this nonlinearity. In order to determine the optimal parameters in this model, an Unscented Kalman Filter (UKF)-based algorithm was applied to extract the knowledge contained in the sensors data. All the parameters that need to be identified are listed as the extended state variables, and the identification was achieved via the step-by-step state prediction and state update process. Effectiveness of the proposed method was verified through a group of experimental data, and results showed good agreement. Furthermore, the proposed method was compared with the Extended Kalman Filter (EKF)-based method, and better accuracy was easily found. The proposed parameter identification method has great applicability for structural objects with nonlinear behaviors and could be extended to research in other engineering fields.
Keyword ：
nonlinear estimation nonlinear estimation civil infrastructures civil infrastructures adaptive updating adaptive updating complex nonlinear model complex nonlinear model dynamic substructure dynamic substructure
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| GB/T 7714 | Su Tingli , Tang Zhenyun , Peng Lingyun et al. Model updating for real time dynamic substructures based on UKF algorithm [J]. | EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION , 2020 , 19 (2) : 413-421 . |
| MLA | Su Tingli et al. "Model updating for real time dynamic substructures based on UKF algorithm" . | EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION 19 . 2 (2020) : 413-421 . |
| APA | Su Tingli , Tang Zhenyun , Peng Lingyun , Bai Yuting , Jin Xuebo , Kong Jianlei . Model updating for real time dynamic substructures based on UKF algorithm . | EARTHQUAKE ENGINEERING AND ENGINEERING VIBRATION , 2020 , 19 (2) , 413-421 . |
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Abstract ：
This paper focuses on the stability analysis of tunnel structures with a circular hollow section based on the with a strain-degradation model using unified strength theory. A simplified numerical approach is proposed for analyzing the elasto-plastic behavior of surrounding rocks. A constitutive equation is proposed based on the unified strength theory and the strain degradation behavior was taken into account as well with deviatoric plastic strain chosen as the degradation parameter. Meanwhile, the plastic potential function can be obtained with the associated flow rule, by which the surrounding rocks can be classified as plastic zone and elastic zone. The solution in plastic zones adopted the differential method subdividing surrounding rock into infinitesimal concentric annuli, in which the radial stresses decrease monotonically with a decrease in radial coordinate. The relationship of the increment of stresses and the increment of strains in adjacent annuli can be derived from equilibrium, constitutive and geometrical equations. The numerical solution of each annulus is calculated from the outmost annulus at the elastic-plastic interface. In addition, the impact of the intermediate principal stress factor and the critical degradation parameter on the solution, and the factors of influence on plastic radius are discussed.
Keyword ：
underground structure underground structure flow rule flow rule strain degradation strain degradation numerical analysis numerical analysis twin-shear unified strength twin-shear unified strength Damage mechanics Damage mechanics
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| GB/T 7714 | Bai, Yongtao , Guan, Shaoyu , Tang, Zhenyun et al. Strain-degradation analysis of tunnel structures based on twin-shear unified strength criterion [J]. | LATIN AMERICAN JOURNAL OF SOLIDS AND STRUCTURES , 2020 , 17 (2) . |
| MLA | Bai, Yongtao et al. "Strain-degradation analysis of tunnel structures based on twin-shear unified strength criterion" . | LATIN AMERICAN JOURNAL OF SOLIDS AND STRUCTURES 17 . 2 (2020) . |
| APA | Bai, Yongtao , Guan, Shaoyu , Tang, Zhenyun , Florez-Lopez, Julio . Strain-degradation analysis of tunnel structures based on twin-shear unified strength criterion . | LATIN AMERICAN JOURNAL OF SOLIDS AND STRUCTURES , 2020 , 17 (2) . |
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