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Testing and finite element modeling of stressed skin diaphragms
Qilin Zhang,Yang Liu,Weijun Qian 국제구조공학회 2007 Steel and Composite Structures, An International J Vol.7 No.1
The cold formed light-gauge profiled steel sheeting can offer considerable shear resistance acting in the steel building frame. This paper conducted the full-scale test on the shear behavior of stressed skin diaphragm using profiled sheeting connected by the self-tapping screws. A three-dimensional finite element model that simulates the stressed skin diaphragm was developed. The sheet was modeled using thin element model while the supporting members were simulated using beam elements. Fasteners were represented in the numerical model as equivalent springs. A joint test program was conducted to characterize the properties of these springs and results were reported in this study. Finite element model of the full-scale test was analyzed by use of the ANSYS package, considering nonlinearity caused by the large deflection and slip of fasteners. The experimental data was compared with the results acquired by the EUR formulas and finite element analysis.
Structural Health Monitoring of Shanghai Tower Considering Time-dependent Effects
Zhang, Qilin,Yang, Bin,Liu, Tao,Li, Han,Lv, Jia Council on Tall Building and Urban Habitat Korea 2015 International journal of high-rise buildings Vol.4 No.1
This paper presents the structural health monitoring (SHM) of Shanghai Tower. In order to provide useful information for safety evaluation and regular maintenance under construction and in-service condition, a comprehensive structural health monitoring (SHM) system is installed in Shanghai Tower, which is composed of a main monitoring station and eleven substations. Structural responses at different construction stages are measured using this SHM system and presented in this study. Meanwhile, a detailed finite element model (FEM) is created and comparison of results between SHM and FEM is carried out. Results indicate that the time-dependent property of concrete creep is of great importance to structural response and the measured data can be used in FEM updating to obtain more accurate FEM models at different construction stages. Therefore, installation of structural health monitoring system in super-tall buildings could be considered as an effective way to assure structural safety during the construction process.
Research on the mechanical properties of membrane connections in tensioned membrane structures
Zhang, Yingying,Zhang, Qilin,Li, Yang,Chen, Lu Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.49 No.6
As an important part, the connections generally are important for the overall behavior of the structure and the strength and serviceability of the connection should be ensured. This paper presents the mechanical properties of membrane connections in tensioned membrane structure. First, the details of common connections used in the membrane structure are introduced. Then, the common connections including membrane seam, membrane-flexible edge connection and membrane-rigid edge connection are tested and the corresponding failure mechanisms are discussed. Finally, the effects of connection parameters on the connection strength are investigated and proper connection parameters are proposed. The strength reduction factors corresponding to different connection types are proposed, which can be references for the design and analysis of membrane structures.
Real-time structural health monitoring system based on streaming data
Qilin Zhang,Siyuan Sun,Bin Yang,Roland Wüchner,Licheng Pan,Haitao Zhu 국제구조공학회 2021 Smart Structures and Systems, An International Jou Vol.28 No.2
In this paper, a novel real-time structural health monitoring (SHM) system based on streaming data is proposed. In contrast to a traditional SHM system, the proposed system implements a series of optimizations for data transmission and processing to reduce the latency and better satisfy the real-time requirement. The concept of the watermark in the streaming system is adopted to address the problem of when to trigger the time window calculation under the real-time requirement. Moreover, a well-designed parallel mechanism is used to satisfy the multistage computation requirement in the parallel data stream. A case study in which the proposed system is applied to the Shanghai Tower is presented. The peak picking method is used as an example in the test environment to track the latency of each main operation under different parallelism schemes. The results show that computing in parallel effectively reduces the latency and provides a reference for integrating the random decrement technique (RDT), stochastic subspace identification (SSI), or other more complex but effective algorithms in parallel into the system in the future. The total latency under the test environment from data generation to data transmission to the web server is approximately only 200-400 ms, which indicates the excellent real-time performance of the system.
Online automatic structural health assessment of the Shanghai Tower
Qilin Zhang,Xiaoxiang Tang,Jie W,Bin Yang 국제구조공학회 2019 Smart Structures and Systems, An International Jou Vol.24 No.3
Structural health monitoring (SHM) is of great importance to super high-rise buildings. The Shanghai Tower is currently the tallest building in China, and a complete SHM system was simultaneously constructed at the beginning of the construction of the tower. Due to the variety of sensor types and the large number of measurement points in the SHM system, an online automatic structural health assessment method with few computations and no manual intervention is needed. This paper introduces a structural health assessment method for the Shanghai Tower that uses the coefficients of an autoregressive (AR) time series model as structural state indicators. An analysis of collected data indicates that the coefficients of the AR model are affected by environmental factors, and the principal component analysis method is used to remove the influence of environmental factors. Finally, the control chart method is used to track the changes in structural state indicators, and a plan for online automatic structure health state evaluation is proposed. This method is applied to long-term acceleration and inclination data from the Shanghai Tower and successfully identifies the changes in the structural state. Overall, the structural state indicators of the Shanghai Tower are stable, and the structure is in a healthy state.
Research on the mechanical properties of membrane connections in tensioned membrane structures
Yingying Zhang,Qilin Zhang,Yang Li,Lu Chen 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.49 No.6
As an important part, the connections generally are important for the overall behavior of the structure and the strength and serviceability of the connection should be ensured. This paper presents the mechanical properties of membrane connections in tensioned membrane structure. First, the details of common connections used in the membrane structure are introduced. Then, the common connections including membrane seam, membrane-flexible edge connection and membrane-rigid edge connection are tested and the corresponding failure mechanisms are discussed. Finally, the effects of connection parameters on the connection strength are investigated and proper connection parameters are proposed. The strength reduction factors corresponding to different connection types are proposed, which can be references for the design and analysis of membrane structures.
Yingying Zhang,Jigang Xue,Xiaoguang Song,Qilin Zhang 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.5
This paper presents the numerical parametric analysis on the loading capacity of Channel purlins with screw-fastened sheeting, in which the eff ects of anti-sag bar and corrugated steel sheet on the ultimate capacity are studied. Results show that the setup of anti-sag bars can reduce the deformations and improve the ultimate capacity of C purlins. The traditional method of setting the anti-sag bars in the middle of the web is favorable. The changing of sheeting type, sheeting thickness and rib spacing has signifi cant eff ects on the ultimate capacity of C purlins without anti-sag bars, compared with those with anti-sag bars. The proposed design formulas are relatively consistent with the calculations of EN 1993-1-3:2006, which is diff erent from those of GB 50018-2002.
Numerical study on tensioned membrane structures under impact load
Yingying Zhang,Yushuai Zhao,Mingyue Zhang,Yi Zhou,Qilin Zhang 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.71 No.2
This paper presents the numerical simulation of membrane structure under impact load. Firstly, the numericalsimulation model is validated by comparing with the test in Hao’s research. Then, the effects of the shape of the projectile, themembrane prestress and the initial impact speed, are investigated for studying the dynamic response and failure mechanism, basedon the membrane displacement, projectile acceleration and kinetic energy. Finally, the results show that the initial speed and thepunch shape are related with the loss of kinetic energy of projectiles. Meanwhile, the membrane prestress is an important factor thataffects the energy dissipation capacity and the impact resistance of membrane structures.