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Online hybrid test using a finite element program and an explicit integration scheme

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Science China(Technological Sciences) 2015年第1期58卷 163-173页

作者： Alexandre LAM pan peng DENG KaiLai Department of Civil Engineering Tsinghua University Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry Department of Civil Engineering Tsinghua University

A new online hybrid test system combined with substructuring techniques and incorporating finite element methods is *** the proposed system,numerical substructure analysis is conducted by ABAQUS/*** ABAQUS user subroutine is used as the interface between the main control program and ABAQUS to impose the target displacements and determine the reaction *** iteration is needed in this system,making it suitable for physical *** the approach also avoids the need to modify source code,it will be appealing to a number of real engineering *** proposed system adopts a separated-model framework,operator-splitting integration scheme,and data exchange through a socket *** earthquake responses of a simple steel moment-resisting frame are simulated,and the results obtained from the new system are compared to those obtained from the conventional *** is found that the results obtained from the new system are accurate,demonstrating the applicability and efficiency of the proposed *** optimal test parameters are also studied to gain the most accurate results in the minimum time.

关键词： online hybrid test substructuring ABAQUS/Explicit separated-model framework operator-splitting method

Test and simulation of full-scale self-centering beam-to-column connection

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Earthquake Engineering and Engineering Vibration 2013年第4期12卷 599-607页

作者： Deng Kailai pan peng Alexandre Lam pan Zhenhua Ye Lieping Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry Department of Civil EngineeringTsinghua University

A new type of beam-to-column connection for steel moment flames, designated as a ＂self-centering connection,＂ is studied. In this connection, bolted top-and-seat angles, and post-tensioned （PT） high-strength steel strands running along the beam are used. The PT strands tie the beam flanges on the column flange to resist moment and provide self-centering force. After an earthquake, the connections have zero deformation, and can be restored to their original status by simply replacing the angles. Four full-scale connections were tested under cyclic loading. The strength, energy-dissipation capacity, hysteresis curve, as well as angles and PT strands behavior of the connections are investigated. A general FEM analysis program called ABAQUS 6.9 is adopted to model the four test specimens. The numerical and test results match very well. Both the test and analysis results suggest that：（1） the columns and beams remain elastic while the angles sustain plastic deformations for energy dissipation when the rotation of the beam related to the column equals 0.05 tad, （2） the energy dissipation capacity is enhanced when the thickness of the angle is increased, and （3） the number of PT strands has a significant influence on the behavior of the connections, whereas the distance between the strands is not as important to the performance of the connection.

关键词： steel frame connection angle post-tensioned prestressing self-centering

Event-triggered robust control for networked control systems with actuator failures and time-varying transmission delays

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International Journal of Intelligent Computing and Cybernetics 2015年第2期8卷 172-186页

作者： peng pan Shun Jiang Feng pan Key Laboratory of Advanced Process Control for Light Industry(Ministry of Education) Jiangnan UniversityWuxiChina

Purpose–The purpose of this paper is with robust control problem for event-triggered networked control systems(NCSs)with actuator failures and time-varying transmission ***/methodology/approach–A random sequence is introduced to describe the actuator faults,and a novel event-triggering communication scheme is adopted in the sensor-to-controller *** taking the event-triggered mechanism and network transmission delay into consideration,a delay system model is ***–Based on Lyapunov stability theory and free weighting matrix method,the feasibility criteria for co-designing both the controller gain and the trigger parameters are ***,a simulation example is exploited to demonstrate the effectiveness of the proposed linear matrix inequalities(LMIs)***/value–The introduced approach is interesting for NCSs with actuator failures and timevarying transmission delays.

关键词： Robust control Networked control Actuator failure Event-triggering scheme

Aqueous RAFT Polymerization of Acrylamide： A Convenient Method for Polyacrylamide with Narrow Molecular Weight Distribution

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维普期刊数据库

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Chinese Journal of Polymer Science 2017年第1期35卷 123-129页

作者： jun liang 单国荣 peng-ju pan State Key Laboratory of Chemical Engineering College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China

Controlled and homogeneous flee-radical polymerization of acrylamide （AM） in aqueous phase was realized by using S,S＇-bis（α, α＇-dimethyl-α＂-acetic acid）-trithiocarbonate as a reversible addition-fragmentation transfer （RAFT） agent. Linear increases in molecular weight with conversion and narrow molecular weight distribution were observed for polyacrylamide （PAM） throughout the polymerization. By this method, PAMs with controlled molecular weight （up to 1.0 ~ 106） and narrow molecular weight distribution （Mw/Mn 〈 1.2） were prepared. This study provides an effective method for synthesis of PAMs with narrow molecular weight distribution under environmentally friendly conditions.

关键词： Homogeneous aqueous RAFT polymerization Polyacrylamide Controlled molecular weight Narrow molecularweight distribution

Seismic performance evaluation of an infilled rocking wall frame structure through quasi-static cyclic testing

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Earthquake Engineering and Engineering Vibration 2018年第2期17卷 371-383页

作者： pan peng Wu Shoujun Wang Haishen Nie Xin Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry Department of Civil Engineering Tsinghua University Department of Civil Engineering Tsinghua University

Earthquake investigations have illustrated that even code-compliant reinforced concrete frames may suffer from soft-story *** damage mode results in poor ductility and limited energy *** components offer alternatives that may avoid such failures.A novel infilled rocking wall frame system is proposed that takes advantage of continuous component and rocking *** studies have investigated similar systems that combine a reinforced concrete frame and a wall with rocking behavior ***,a large-scale experimental study of a reinforced concrete frame combined with a rocking wall has not been *** this study,a seismic performance evaluation of the newly proposed infilled rocking wall frame structure was conducted through quasi-static cyclic *** joints were designed and *** models were established and calibrated to estimate frame shear *** results evaluation demonstrate that an infilled rocking wall frame can effectively avoid soft-story *** and initial stiffness are greatly improved and self-centering behavior is achieved with the help of the infilled rocking *** distribution becomes more uniform with *** cracks and damage occurs in desired *** infilled rocking wall frame offers a promising approach to achieving seismic resilience.

关键词： infilled rocking wall frame seismic performance displacement distribution quasi-static cyclic test

Development of piezoelectric energy-harvesting tuned mass damper

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Science China(Technological Sciences) 2017年第3期60卷 467-478页

作者： pan peng ZHANG DongBin NIE Xin CHEN HaoWen Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry Tsinghua University Beijing 100084 China Department of Civil Engineering Tsinghua University Beijing 100084 China

Tuned mass dampers（TMDs）are one of the most widely used devices to mitigate vibrations in ***,in conventional TMDs,viscous dampers convert the energy of vibration into heat.A new type of TMDs,called regenerative TMD... 详细信息

关键词： piezoelectric tuned mass damper regenerative vibration control energy harvesting

New three-dimensional guidance law for BTT missiles based on differential geometry and Lie-group

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Journal of Systems Engineering and Electronics 2011年第4期22卷 684-690页

作者： Shuangchun peng Liang pan Tianjiang Hu Lincheng Shen College of Mechatronic Engineering and Automation National University of Defense Technology Changsha 410073 P. R. China

A new non-decoupling three-dimensional guidance law is proposed for bank-to-turn （BTT） missiles with the motion coupling problem. In this method, the different geometry is taken for theoretically modeling on B-IT missiles＇ motion within the threedimensional style without information loss, and meanwhile, Liegroup is utilized to describe the line-of-sight （LOS） azimuth when the terminal angular constraints are considered. Under these cir- cumstances, a guidance kinematics model is established based on differential geometry. Then, corresponding to no terminal angular constraint and terminal angular constraints, guidance laws are re- spectively designed by using proportional control and generalized proportional-derivative （PD） control in SO（3） group. Eventually, simulation results validate that this developed method can effectively avoid the complexity of pure Lie-group method and the information loss of the traditional decoupling method as well.

关键词： three-dimensional guidance law differential geometry,Lie-group control bank-to-turn (BTT).

Development of a double-layer shaking table for large-displacement high-frequency excitation

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Earthquake Engineering and Engineering Vibration 2022年第1期21卷 193-207页

作者： pan peng Guo Youming Kang Yingjie Wang Tao Han Qinghua Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake AdministrationSanhe 065201China Department of Civil Engineering Tsinghua UniversityBeijing 100084China School of Civil Engineering Tianjin UniversityTianjin 300350China

It is difficult to conduct shaking table tests that require large-displacement high-frequency seismic excitation due to the limited capacity of existing electrohydraulic servo *** address this problem,a double-layer shaking table(DLST)is *** DLST has two layers of one table each(i.e.,an upper table and lower table)and aims at reproducing target seismic excitation on the upper *** original signal is separated into two signals(i.e.,a high-frequency signal and low-frequency signal)through a fast Fourier transform/inverse fast Fourier transform process,and these signals are applied to the two tables *** actuators connected to different tables only need to generate large-displacement low-frequency or small-displacement high-frequency *** three-variable control method is used to generate large-displacement but low-frequency motion of the lower table and high-frequency but small-displacement motion of the upper table relative to the table beneath.A series of simulations are carried out using MATLAB/*** simulation results suggest that the DLST can successfully generate large-displacement high-frequency *** control strategy in which the lower table tracks the low-frequency signal and the upper table tracks the original signal is recommended.

关键词： double-layer shaking table large-displacement high-frequency excitation electrohydraulic servo system three-variable control MATLAB/Simulink

Pseudo-dynamic tests on masonry residential buildings seismically retrofitted by precast steel reinforced concrete walls

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Earthquake Engineering and Engineering Vibration 2017年第3期16卷 587-597页

作者： Li Wenfeng Wang Tao Chen Xi Zhong Xiang pan peng Beijing Institute of Architectural Design Beijing 100045 China Key Laboratory of Earthquake Engineering and Engineering Vibration Institute of Engineering MechanicsChina Earthquake Administration Sanhe 065201 China Department of Civil Engineering Tsinghua University Beijing 100084 China

A retrofitting technology using precast steel reinforced concrete（PSRC） panels is developed to improve the seismic performance of old masonry buildings. The PSRC panels are built up as an external PSRC wall system surrounding the existing masonry building. The PSRC walls are well connected to the existing masonry building, which provides enough confinement to effectively improve the ductility, strength, and stiffenss of old masonry structures. The PSRC panels are prefabricated in a factory, significantly reducing the situ work and associated construction time. To demonstrate the feasibility and mechanical effectivenss of the proposed retrofitting system, a full-scale five-story specimen was constructed. The retrofitting process was completed within five weeks with very limited indoor operation. The specimen was then tested in the lateral direction, which could potentially suffer sigifnicant damage in a large earthquake. The technical feasibility, construction workability, and seismic performance were thoroughly demonstrated by a full-scale specimen construction and pseudo-dynamic tests.

关键词： masonry buildings precast SRC panel seismic retrofit pseudo-dynamic test seismic performance