scholarly journals Xiakou Xiangxi River Bridge structure design

2020 ◽  
Vol 560 ◽  
pp. 012093
Author(s):  
Rao Zongrun ◽  
Li Ming ◽  
Chen Zhuoqun
Keyword(s):  
Structure Design ◽  
Bridge Structure ◽  
Xiangxi River

Bridge structure design and finite element analysis

2021 ◽  
Author(s):  
Xiaolin Zhang ◽  
Tianyi Guan ◽  
Lei Fan ◽  
Na Wang ◽  
Li Shang ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structure Design ◽  
Bridge Structure ◽  
Element Analysis

Experimental Study on the Dynamic Deformation of Simply Supported Beam in Chinese High-speed Railway

2018 ◽  
Author(s):  
Gonglian Dai ◽  
Meng Wang ◽  
Tianliang Zhao ◽  
Wenshuo Liu
Keyword(s):  
High Speed ◽  
Structure Design ◽  
Dynamic Coefficient ◽  
Bridge Structure ◽  
High Speed Railway ◽  
Simply Supported Beam ◽  
Vertical Stiffness ◽  
Simply Supported ◽  
Speed Up ◽  
Design Speed

<p>At present, Chinese high-speed railway operating mileage has exceeded 20 thousand km, and the proportion of the bridge is nearly 50%. Moreover, high-speed railway design speed is constantly improving. Therefore, controlling the deformation of the bridge structure strictly is particularly important to train speed-up as well as to ensure the smoothness of the line. This paper, based on the field test, shows the vertical and transverse absolute displacements of bridge structure by field collection. What’s more, resonance speed and dynamic coefficient of bridge were studied. The results show that: the horizontal and vertical stiffness of the bridge can meet the requirements of <b>Chinese “high-speed railway design specification” (HRDS)</b>, and the structure design can be optimized. However, the dynamic coefficient may be greater than the specification suggested value. And the simply supported beam with CRTSII ballastless track has second-order vertical resonance velocity 306km/h and third-order transverse resonance velocity 312km/h by test results, which are all coincide with the theoretical resonance velocity.</p>

Micro-Bridge Structure Design of UFPA with Highly Sensitive Pixels

2013 ◽  
Vol 404 ◽  
pp. 467-472
Author(s):  
Mao Yan Fan ◽  
Li Fang Zhang
Keyword(s):  
Thermal Conductivity ◽  
Thick Film ◽  
Structure Design ◽  
Mechanical Support ◽  
Bridge Structure ◽  
Pixel Size ◽  
Thermal Isolation ◽  
Highly Sensitive ◽  
Imaging Performance

The Micro-bridge structure pays an important role in the mechanical support, thermal isolation and electrical connection for the UFPA detector, the quality of which has a direct effect on the imaging performance of the UFPA detector. A kind of Micro-bridge pixel is provided in this paper with thick-film pixel size of 360μm×360μm and desk-type adiabatic frame support, and the analysis results by FEM show that the minor thermal conductivity G and high responsivity can be obtained.

scholarly journals Feasibility simulation of aseismic structure design for long-span bridges

Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 1107-1117
Author(s):  
Li Lai
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Seismic Isolation ◽  
Structure Design ◽  
Bridge Structure ◽  
Element Analysis ◽  
Structural Dynamic ◽  
Dynamic Reliability ◽  
Long Span Bridges ◽  
Long Span

Abstract In the traditional finite element analysis method, when simulating the feasibility of aseismic structure design of long-span bridges, only finite element analysis is carried out on the bridge structure without considering the aseismic situation of the aseismic structure of the bridge under different schemes, which leads to one-sidedness of the simulation results. Therefore, a new simulation method for the feasibility study of seismic design of long-span bridges is proposed in this paper. 5 seismic isolation schemes for long-span bridge structures are designed. The lock-up devices and liquid viscous dampers are deployed in bridge structure. Numerical simulation of bridge structure is carried out by establishing calculation model and improved hierarchical Kerr spring model. The responses of long-span bridges under seismic loading for 5 seismic isolation schemes are analyzed. On this basis, the seismic performance of long-span bridges is tested by using the multi-point excitation motion equation, the response power spectrum and the structural dynamic reliability analysis based on the first transcendental failure criterion. Experimental results show that all the five seismic isolation schemes are feasible, and the seismic effect of the schemes 4 and 5 is the strongest. The maximum horizontal thrust of pier top is 6.27E+062, 0.50E+07 and 6.00E+06, 2.78E+07, respectively. The proposed method can be used to simulate the seismic response of long-span bridges.

Influences of Beam-Arch Combination Bridge Structure Arrangement on Mechanical Characteristics

2011 ◽  
Vol 243-249 ◽  
pp. 1707-1710
Author(s):  
Ri Chen Ji ◽  
Yue Zhen Xu ◽  
Ying Zhe Sun
Keyword(s):  
Mechanical Characteristics ◽  
Bending Moment ◽  
Element Model ◽  
Structure Design ◽  
Design Parameters ◽  
Bridge Structure ◽  
Basic Frequency ◽  
Calculation Results ◽  
Practical Engineering ◽  
The Finite Element Model

For the arrangement of suspender and arch rib in the combination of beam and arch bridge, the finite element model is established according to the background of practical engineering. The influence of the variations of structure design parameters on structure characteristics of the static and dynamic is analyzed. The calculation results show that the different layout of suspender has small effect on the axial force variations of tie beam and arch rib, but has bigger influence on the bending moment of partial section. The structural transverse basic frequency augments with increase of arch rib leaning-angle, the vertical and twisting basic frequency is larger when the leaning suspender and netted suspender are used. The arrangement of suspender and arch rib should be optimized in the design of similar bridge.

Analysis on the Sensitivity of Structure in Girder Steel Bridge Deck Pavement

2011 ◽  
Vol 382 ◽  
pp. 466-470
Author(s):  
De Jia Zhang ◽  
Fen Ye ◽  
Guo Jie Jiang ◽  
Jin Ting Wu
Keyword(s):  
Bridge Deck ◽  
Structure Design ◽  
Design Parameters ◽  
Slab Thickness ◽  
Transverse Strain ◽  
Steel Bridge ◽  
Bridge Structure ◽  
The Finite Element Method ◽  
Bridge Deck Pavement

Bridge structure has important impact on pavement stress, and previous research often analyses separately which is one of the reason for pavement disease. This paper analyses the sensitivity of structure in girder steel bridge deck pavement with the finite element method, obtaining the changing regularity of maximum transverse strain, maximum longitudinal strain, maximum longitudinal displacement of pavement surface, interlaminar shearing stresses with six kinds of the structure design parameters including bridge roof slab thickness, diaphragm plates distance, U rib width, distance, thickness, girder space under the most unfavorable load. The study can offer help for the determination of bridge structure design parameters.

Vibration characteristics of island-bridge structure on porous PDMS substrates for stretchable electronics

2021 ◽  
pp. 1-18
Author(s):  
Xin Song ◽  
Zuguang Bian ◽  
Xiaoliang Zhou ◽  
Zhuye Huang
Keyword(s):  
Analytical Model ◽  
Mechanical Design ◽  
Dynamic Performance ◽  
Structure Design ◽  
Vibration Characteristics ◽  
Mode Shapes ◽  
Stretchable Electronics ◽  
Bridge Structure ◽  
Element Analysis ◽  
Design And Optimization

Abstract Stretchable electronics employing island-bridge structure design can achieve controllable and reversible stretchability. The use of a porous substrate, which provides excellent breathability for wearable devices bonded to skin, not only satisfies this static superiority but also has a profound impact on the dynamic performance of the stretchable electronics. In this paper, the vibration characteristics of the island-bridge structure based on porous polydimethylsiloxane (p-PDMS) substrates are studied by utilizing an analytical model, which takes account of geometric nonlinearity due to mid-plane stretching, buckling configuration, elastic boundary conditions considering the p-PDMS substrates and the mass of the island. In numerical examples, the accuracy of the analytical model is first verified by finite element analysis (FEA). After that, we investigate the effects of some primary factors, i.e. the prestrain of the substrate, spring stiffnesses at the ends of the interconnect, porosity and thickness of the substrate, and the mass of the island, on the natural frequencies and vibration mode shapes of the island-bridge structure. Results show that the vibration characteristics of the island-bridge structure can be tuned conveniently by adjusting the porosity of the substrate and the mass of the island, which are expected to be helpful to mechanical design and optimization of stretchable electronics in complex noise environments.

Structure Design, Fabrication and Characteristics of Polysilicon Nano-Thin Films Resistances Pressure Sensor Based on MEMS Technology

2011 ◽  
Vol 483 ◽  
pp. 200-205
Author(s):  
Xiao Feng Zhao ◽  
Dian Zhong Wen ◽  
Yang Li ◽  
Yuan Xin Hou ◽  
Chun Peng Ai ◽  
...  
Keyword(s):  
Thin Films ◽  
Pressure Sensor ◽  
Single Crystal Silicon ◽  
Wheatstone Bridge ◽  
Structure Design ◽  
Constant Current ◽  
Bridge Structure ◽  
Crystal Silicon ◽  
Mems Technology ◽  
Single Crystal Silicon Substrate

A polysilicon nano-thin films pressure sensor was designed and fabricated on single crystal silicon substrate by MEMS technology in this paper, and the sensor is composed by Wheatstone bridge structure with four polysilicon nano-thin films resistances fabricated on squared silicon membrane. The experiment result shows that, under constant current power supply of 0.875mA , full scale output is 24.05 mV at room temperature, sensitivity is 0.15 mV/kPa, when the temperatures are from -20 to 80°C, the coefficient of zero temperature and sensitivity temperature is –960 ppm/°C and –820 ppm /°C respectively.

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