Deformation study of Lining on Overlap Tunnels Based on Elastic Foundation Beam

2011 ◽  
Vol 94-96 ◽  
pp. 1875-1878
Author(s):  
Chun Quan Dai ◽  
Lei Wang ◽  
Yong Ji Wang
Keyword(s):  
Numerical Simulation ◽  
Elastic Foundation ◽  
Short Distance ◽  
Internal Force ◽  
Theoretical Formula ◽  
Force Analysis ◽  
Simulation Test ◽  
Engineering Development ◽  
Elastic Foundation Beam ◽  
Calculating Model

Tunnels of new across the old one with short distance is the emphasis and difficulty in metro engineering development, which has great research values. According to the characteristic of deformation on overlap tunnels with short distance, we put forward the calculating model of lining deformation and internal force analysis. And deduced the formula of calculation on the new tunnel's construction to adjacent ones, then discussed and analyzed the settlement of the point of inflection on soffit lining and the greatest subsidence angle. We verify the theoretical formula about the reliability of the computation and rationality through a series of numerical simulation test against the background of Qingdao overlap tunnels.

Internal force calculation of half through arch bridge based on elastic foundation beam algorithm

2021 ◽  
Author(s):  
Yurong Ma ◽  
Yuyi Zhang ◽  
Qianwen Han ◽  
Feng Wang ◽  
Yaqiong Jiang ◽  
...  
Keyword(s):  
Elastic Foundation ◽  
Internal Force ◽  
Arch Bridge ◽  
Force Calculation ◽  
Elastic Foundation Beam

scholarly journals Internal force calculation of long span suspension bridge under vertical load based on elastic foundation beam algorithm

2021 ◽  
Vol 283 ◽  
pp. 01031
Author(s):  
Ma Yurong ◽  
Han Qianwen ◽  
Wang Feng ◽  
Li Haixia
Keyword(s):  
Elastic Foundation ◽  
Suspension Bridge ◽  
Internal Force ◽  
Design Calculation ◽  
Vertical Load ◽  
Software Modeling ◽  
Section Design ◽  
Main Component ◽  
Force Calculation ◽  
Elastic Foundation Beam

The calculation of suspension bridge under vertical load is the most important content of suspension bridge design calculation and the most important basis of main component design. Combined with the knowledge of structural mechanics, this paper puts forward the elastic foundation beam algorithm, and deduces the important formulas for the cross-section design and strength comparison of sling, cable and stiffening beam. In use, as long as the parameters are brought into the formula, it is more convenient and fast compared with the complex software modeling. The method proposed in this paper is used to check the strength of the completed Japanese Guanmen bridge, and the results are accurate enough. It is fast and reliable to use this method in the preliminary design and rapid safety assessment of suspension bridge.

scholarly journals Internal Force Analysis and Field Test of Lattice Beam Based on Winkler Theory for Elastic Foundation Beam

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
Jingbang Li ◽  
Yanpeng Zhu ◽  
Shuaihua Ye ◽  
Xiaorui Ma
Keyword(s):  
Elastic Foundation ◽  
Field Test ◽  
Calculation Method ◽  
Internal Force ◽  
Test Results ◽  
Force Analysis ◽  
Anchor Cable ◽  
Lattice Beam ◽  
Prestressed Anchor ◽  
Theoretical Results

As a new flexible supporting structure, prestressed anchor cable lattice beams have been widely used in high-slope support engineering and have achieved good results. However, theoretical research on the internal force analysis of lattice beams is far behind engineering practice. Based on the theory of the Winkler elastic foundation model, a mechanical model of a prestressed anchor cable lattice beam at the tension stage was established. Considering the nonhomogeneous lattice beam materials, a calculation method was given and applied to engineering examples. A calculation method of the measured moment was introduced in the field test conducted in the Zhouqu County “8·8” debris flow disaster reconstruction project. Comparisons between the test results and the theoretical results were performed. The results showed that the theoretical results of the distribution trend of the lattice beam moment were consistent with the test results, which verified the rationality of the proposed calculation method. The inertia moment of the beam section solved by the transformed section method was more realistic. The results of the transformed section method could improve the bending resistance of the lattice beam and reduce the reinforcement ratio. The greater the anchoring force was, the more obvious the lifting effect was. The anchoring force was an important influencing factor of the internal force of the lattice beam. The greater the anchoring force was, the greater the lattice beam moment was, and they showed the same proportional change phenomenon. Compared with the theoretical moment, the measured moment obtained by the test was smaller, which indicated that the lattice beam of the tested slope was safe at the present stage.

Computing Method of Elastic Foundation Beam by MATLAB and its Application

2011 ◽  
Vol 368-373 ◽  
pp. 2760-2763
Author(s):  
Qiang Wang ◽  
Li Yuan Tong
Keyword(s):  
Elastic Foundation ◽  
Bending Moment ◽  
Internal Force ◽  
Beam Deflection ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Supporting Structure ◽  
Internal Forces ◽  
Computing Method ◽  
Elastic Foundation Beam

The elastic foundation beam method is the main method of stress analysis of the supporting structure of the foundation pit, it can easily calculate the internal forces and displacement of the structure, however, the computing method of elastic foundation beam deflection equation is more complicated. So according to the computation principle and method of elastic foundation beam, a computing program has been programmed by MATLAB mathematical software. The program has been applied to compute the internal force and deformation of deep foundation pit of Suzhou subway station. The variation law of displacement and bending moment of supporting structure during excavation has been obtained. The results of the measured and calculated agree well, and the computing results have efficiently guided and optimized supporting design.

On Numerical Simulation of the Stepped Soil-Nail Wall

2013 ◽  
Vol 353-356 ◽  
pp. 692-695
Author(s):  
Chang Zhi Zhu ◽  
Quan Chen Gao
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Internal Force ◽  
Numerical Results ◽  
Analysis Model ◽  
Foundation Pit ◽  
Soil Nails ◽  
Soil Nail ◽  
Soil Nail Wall ◽  
Design And Construction

Based on an Engineering Example which was supported by the stepped soil-nail wall, a numerical analysis model was established by FLAC3D,and the process of the excavation and supporting was simulated, and the numerical results of the soil nails internal force and foundation pit deformation were obtained. The simulated result was consistent with the measured results. It shows that the method of FLAC3D numerical analysis can be used to the numerical analysis of foundation pit excavation and supporting, and it will provide the basis for the design and construction of practice project.

scholarly journals Study On Numerical Simulation of the Arrangement about Mining Roadway with Short Distance

2011 ◽  
Vol 26 ◽  
pp. 301-310 ◽  
Author(s):  
Yan Guochao ◽  
Ma Zhonghui ◽  
Hu Yaoqing
Keyword(s):  
Numerical Simulation ◽  
Short Distance

Internal force analysis of the resistance unit of frame-truss composite wall

2021 ◽  
Vol 44 ◽  
pp. 103307
Author(s):  
Xin Yong ◽  
Zhongmin Wang ◽  
Xiaolei Li ◽  
Bo Fan
Keyword(s):  
Internal Force ◽  
Force Analysis ◽  
Composite Wall

On the response and prediction of multi-layered flexible riser under combined load conditions

2019 ◽  
Vol 36 (8) ◽  
pp. 2507-2529 ◽  
Author(s):  
Mengsha Liu ◽  
J.Y. Li ◽  
Lixin Chen ◽  
J.S. Ju
Keyword(s):  
Numerical Simulation ◽  
Internal Pressure ◽  
Internal Force ◽  
External Pressure ◽  
Prediction Methods ◽  
Flexible Riser ◽  
Content Type ◽  
Combined Load ◽  
Simulation Results ◽  
Load Conditions

Purpose The internal force is more complicated in a combined load case than in a single load case, and the influence of the combined load on the stress cannot be neglected. The purpose of this paper is to study the mechanical behavior of the flexible riser under combined load conditions of tension and internal pressure or external pressure. Design/methodology/approach The mechanical behavior of the flexible riser under combined load conditions is studied by numerical simulation with a nine-layer detailed finite element model. The layers of flexible riser are modeled separately, and the interactions between layers have been taken into consideration in numerical simulation. Findings Under tension and internal pressure or external pressure, the pressure armor will bear extra external pressure because of the squeezing actions between layers caused by tension, and the extra external pressure will increase proportionately with the increase of the tension. Under internal pressure and tension, the internal stress for tension armor was nearly unchanged compared to that under unique tension load, whereas under external pressure and tension, the change of internal stress for tension armor was significant. Prediction methods of internal force for pressure armor and tension armor under pressure and tension are given, and the result from the formula agrees well with the simulation results. Originality/value The prediction methods on the internal force of flexible riser proposed in this study are proven accurate, with numerical simulation results, and the prediction methods are convenient for engineering applications.

Force Analysis of the Anchor Chains and the Cable in the Crane-System with a Floating Base in Regular Waves

2014 ◽  
Vol 494-495 ◽  
pp. 321-327
Author(s):  
Ya Xin Huang ◽  
Bing Wang ◽  
Jun Yi Liu
Keyword(s):  
Numerical Simulation ◽  
Discrete Time ◽  
Time History ◽  
Roll Motion ◽  
Force Analysis ◽  
Time Transfer ◽  
Regular Waves ◽  
Body Model ◽  
Floating Base ◽  
Rigid Body Model

In order to analyze the force of the anchor chains and the cable in the crane-system with a floating base, firstly the system is simplified to two-rigid-body model and the anchor chains in the system are in symmetric layout; then the motion response of the system as well as the force of the anchor chains and the cable are solved by use of discrete time transfer matrix method, lastly the time history curves of motion of the system and the force of the anchor chains and the cable are obtained. The results of numerical simulation show that the roll motion has greater influences on the system comparing with sway and heave, the amplitudes of sway and heave are small. Furthermore, the force of the anchor chains are mainly caused by the roll motion while the force caused by sway and heave are relatively small.

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