A smart monitoring system based on ubiquitous computing technique for infra-structural system: Centering on identification of dynamic characteristics of self-anchored suspension bridge

2009 ◽  
Vol 13 (5) ◽  
pp. 333-337 ◽  
Author(s):  
Gwanghee Heo ◽  
Joonryong Jeon
Keyword(s):  
Ubiquitous Computing ◽  
Monitoring System ◽  
Dynamic Characteristics ◽  
Suspension Bridge ◽  
Structural System ◽  
Computing Technique

scholarly journals Dynamic Characteristics of Hanging Truss Having Shape Memory Alloy Wires

2017 ◽  
Vol 7 (2) ◽  
pp. 6 ◽  
Author(s):  
Xuan Zhang ◽  
Kazuyuki Hanahara ◽  
Yukio Tada
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Dynamic Characteristics ◽  
Dynamic Problem ◽  
Vibration Isolation ◽  
Mechanical Characteristics ◽  
Structural System ◽  
Vibration Attenuation ◽  
Calculation Process ◽  
Absorption Characteristics

In this study, we discuss the dynamics of a type of hanging truss structural system consisting of rigid and wire members, part of which are SMA (shape memory alloy) wires. This kind of truss structure has the capability of vibration isolation and absorption. Characteristics of zero compressive stiffness of wire members, SMA wire members and hanging configuration of the structure itself contribute to the effect of vibration isolation. The hysteretic loop of SMA wires plays a significant role in vibration attenuation. Mathematical models for this kind of dynamic problem are developed. Calculation process is introduced to take into account the mechanical characteristics of SMA and wire members. Dynamic characteristics are discussed; simultaneously, the effects of vibration isolation and attenuation have been confirmed. On the basis of the numerical calculations, advantages of combinations of various types of wire members, including the truss units having no bracing wires have been demonstrated. 

Research on Dynamic Characteristics for Large Span Cable-Stayed Suspension Bridges with CFRP Cables

2013 ◽  
Vol 683 ◽  
pp. 845-850
Author(s):  
Rong Gui Liu ◽  
Guo Ying Feng ◽  
Bei Chen
Keyword(s):  
Dynamic Characteristics ◽  
Natural Vibration ◽  
Natural Frequencies ◽  
Suspension Bridge ◽  
Suspension Bridges ◽  
Bridge Structure ◽  
Reinforced Plastics ◽  
New Type ◽  
Carbon Fibre Reinforced Plastics ◽  
Cable Stayed Bridges

Cable-stayed suspension bridge with Carbon Fibre Reinforced Plastics(CFRP) cables is a new type of bridge structure. To study the dynamic characteristics for this kind of bridges, and its differences from cable-stayed bridges of the same span level, finite element dynamic modle of a Cable-stayed suspension bridge with main span of 1488 meters is established and a series of calculations is done. The results show that, natural frequencies of cable-stayed suspension bridges with CFRP cables are relatively small, integral frequencies are stepped and discontinuous; Its modes are centralized and the natural vibration modes show a lot of coupling; The natural frequencies of this kind of bridges are smaller than cable-stayed bridges of the same span level, the entire stiffness decreased.

Study on Construction Process of Suspension Bridge Based on a Co-Rotational Framework

2012 ◽  
Vol 238 ◽  
pp. 709-713
Author(s):  
Bing Jian Wang ◽  
Jian Yong Song ◽  
Jian Ming Lu
Keyword(s):  
Search Algorithm ◽  
Nonlinear Behavior ◽  
Suspension Bridge ◽  
Suspension Bridges ◽  
Element Formulation ◽  
Structural System ◽  
Convergence Criteria ◽  
Modified Method ◽  
Energy Convergence ◽  
Line Search Algorithm

Based on a co-rational (CR) framework, a 2-noded element formulation of 3D truss was presented, which was used for accurately modeling of suspension bridges with large displacements and rotations. The CR framework could consider the out-plane stiffness by the geometric stiffness, which was applicable to the analysis of 3D cable bridges. Using the co-rational truss united with the energy convergence criteria and the Newton with Line Search Algorithm, the nonlinear behavior of 3D cable structural system was simulated conveniently and accurately. Therefore, the traditional truss elements based on elastic modulus modified method and complex catenary elements were avoided. In order to simulate the hanging of girder and the structural system changing during the construction, the elements’ killing and activating methods were realized by the modulus modified methods.

Dynamic Characteristics of Arch Steel Tower in Construction Stages

2014 ◽  
Vol 989-994 ◽  
pp. 3165-3168
Author(s):  
Li Yu ◽  
Yan Yang Che ◽  
Sen Wang ◽  
Guo Hui Zhao
Keyword(s):  
Dynamic Characteristics ◽  
Structural System ◽  
Ansys Software ◽  
Wind Induced Vibration

Based on Hangzhou Zhijiang Bridge, FEA models of arch steel tower in construction and completed stages are established by using ANSYS software. Before closed and completed are considered to compute the dynamic characteristics of different structural system for arch steel tower. The results show that the wind-reduced vibration can be generated easily. It can cause some bad effect on the construction, equipments and the safety of staff. So, some proper measures should be adopted to decrease the wind-induced vibration of arch steel tower in construction and completed stages. So, some meaningful references are provided for the further research on control of wind-Induced vibration for arch steel tower.

Application of Piezoelectricity Acceleration Sensor to Dynamic Characteristics Monitoring of Tied Arch Bridge

2012 ◽  
Vol 184-185 ◽  
pp. 715-718 ◽  
Author(s):  
Yi Li ◽  
Zhong Guo ◽  
Hua Wei
Keyword(s):  
Real Time ◽  
Monitoring System ◽  
Dynamic Characteristics ◽  
Health Monitoring ◽  
Damping Ratio ◽  
Vibration Signal ◽  
Mode Shapes ◽  
Acceleration Sensor ◽  
Arch Bridge ◽  
Tied Arch Bridge

In bridge structural health monitoring, random vibration test and monitoring bridge dynamic characteristics provides an effective method for evaluation of bridge safety and serviceability performance. Piezoelectric accelerometer overcome the draw backs of the traditional sensor characteristic measuring instrument which are functional singleness and monopoly used, a piezoelectricity acceleration sensor performance analysis and dynamic characteristics monitoring system base on a tied arch bridge health monitoring system was designed, and the hardware structure and software of the system were introduced, acquired vibration signal can be displayed, stored, analyzed and processed in real time. The vibration frequency of the bridge structure, mode shapes and damping ratio is calculated base on the monitoring data, and the amplitude of frequency domain shows that the system was validated in actual real-time monitoring of bridge dynamic characteristics.

Sign in / Sign up

Export Citation Format

Share Document