Structural Optimization of Reinforced Concrete Aqueduct with Multi-Longitudinal Beams Part II: Application

2011 ◽  
Vol 243-249 ◽  
pp. 323-326
Author(s):  
Jun Feng Guan ◽  
Xiao Ke Li ◽  
Shun Bo Zhao
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Optimization Design ◽  
Design Method ◽  
Distribution Patterns ◽  
Internal Force ◽  
Structural Deformation ◽  
Structural Element ◽  
Dead Weight ◽  
Shell Finite Element

Based on a 3-D solid finite element parametric model, an optimization design method of reinforced concrete aqueduct with multi-longitudinal beams is proposed. In this method, the stress of sidewall and subplate is controlled by the sectional crack-resisting criteria, the space between longitudinal beams or crossbeams is decided by the coordination of structural deformation, and the bottom stress of longitudinal beams or crossbeams is restrained by the nominal tensile stress. Taking the lightest dead weight of aqueduct as the objective of optimization, this method is able to give the optimal sizes and distribution patterns of the main load bearing members. The internal force of each structural element of the optimized aqueduct is calculated by a 3-D beam-shell finite element numerical model and thus the reinforcements are arranged. Compared with the prototype, the optimized aqueduct shows the advantages of lighter weight, more reasonable stiffness distribution, coordinated deformation and economical reinforcements.

Structure-Soil Interaction of Buried Corrugated Steel Arch Bridge

2010 ◽  
Vol 163-167 ◽  
pp. 2112-2117
Author(s):  
Miao Xin Zhang ◽  
Bao Dong Liu ◽  
Peng Fei Li ◽  
Zhi Mao Feng
Keyword(s):  
Finite Element ◽  
Steel Structures ◽  
Internal Force ◽  
Structural Deformation ◽  
Fe Model ◽  
Soil Pressure ◽  
Load Range ◽  
Finite Element Program ◽  
Load Conditions ◽  
Peak Value

Corrugated steel plate and surrounding soils are working together to share the load in buried corrugated steel structures. It is complicated to consider the structure-soil interaction, so the finite element method has already become the chief means of complicated structure analysis. Based on a practical project, considering structure-soil interaction, by using the finite element program of ANSYS, the paper set up a 2-D FE model and analyzed the soil pressure, the structural deformation and the internal force under different load conditions in detail. The analysis shows that structure-soil interaction has brought about stresses redistribution of surrounding soils, and adverse effects of soil pressure and displacement were limited. The variation range of soil pressure on the crown of arch increases with the load increases and the peak value of soil pressure approach to the code value and a rebound appears in the vehicle load range. The tendencies of vertical soil displacement are nearly the same to different load conditions, and the peak value of moments has an obvious change and can be influenced greatly by deflective load.

A new jig-shape optimization method for the high aspect ratio wing

2018 ◽  
Vol 91 (1) ◽  
pp. 124-133
Author(s):  
Zhe Yuan ◽  
Shihui Huo ◽  
Jianting Ren
Keyword(s):  
Aspect Ratio ◽  
Shape Optimization ◽  
High Aspect Ratio ◽  
Optimization Design ◽  
Design Method ◽  
Aircraft Design ◽  
Optimization Method ◽  
Attack Angle ◽  
Structural Deformation ◽  
Content Type

Purpose Computational efficiency is always the major concern in aircraft design. The purpose of this research is to investigate an efficient jig-shape optimization design method. A new jig-shape optimization method is presented in the current study and its application on the high aspect ratio wing is discussed. Design/methodology/approach First, the effects of bending and torsion on aerodynamic distribution were discussed. The effect of bending deformation was equivalent to the change of attack angle through a new equivalent method. The equivalent attack angle showed a linear dependence on the quadratic function of bending. Then, a new jig-shape optimization method taking integrated structural deformation into account was proposed. The method was realized by four substeps: object decomposition, optimization design, inversion and evaluation. Findings After the new jig-shape optimization design, both aerodynamic distribution and structural configuration have satisfactory results. Meanwhile, the method takes both bending and torsion deformation into account. Practical implications The new jig-shape optimization method can be well used for the high aspect ratio wing. Originality/value The new method is an innovation based on the traditional single parameter design method. It is suitable for engineering application.

Research on the Nonlinearity Finite Element in the Super-Long Reinforced Concrete Frame Structure

2014 ◽  
Vol 1065-1069 ◽  
pp. 1226-1229
Author(s):  
Yong Sheng Zhang ◽  
Yan Ying Li
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Internal Force ◽  
Frame Structure ◽  
Reinforced Concrete Frame ◽  
Engineering Project ◽  
Element Analysis ◽  
Concrete Frame ◽  
Temperature Load ◽  
Reinforced Concrete Frame Structure

Basing on the finite element analysis software, the emergence of crack under the effect of gradual changed temperature load and the change of stress which are in the condition of super reinforced concrete frame structure are analyzed from the linear and nonlinear numeral simulation. The simulation shows that the structure component under the normal condition is cracked and turn into the nonlinear condition and the steel bars still works under the elastic stage. Meanwhile the actual stage which is reflected by the elastic-plastic analysis of the internal force and deformation is compared by the results which are obtained by the actual project observed results and the calculation of the simplified model. So the distribution of the stress which is caused by the structure temperature reduction is greatly evaluated by the usage of the cracking model which is nonlinear finite element and also plays an important role in the engineering project and practice.

Analyses of Performance-Based of Reinforced Concrete Beam

2011 ◽  
Vol 368-373 ◽  
pp. 967-970
Author(s):  
Hai Tao Wan ◽  
Hua Yuan
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Element Simulation ◽  
Concrete Beam ◽  
Design Method ◽  
Reinforced Concrete Beam ◽  
Performance Parameters ◽  
Reinforced Concrete Frame ◽  
Element Simulation ◽  
Load Displacement

The software ABAQUS is used to perform the finite element simulation of a group of reinforced concrete beam tests. The load-displacement skeleton curves of the beams are obtained after the completion of the simulation. Test results and simulation results are compared, results showed that the finite element simulation can be more accurately simulate the test situation. Then, the software ABAQUS is also used to simulate different types of reinforced concrete frame beams, and access to load-displacement skeleton curves and moment – rotation curves of the beams. Reference to the advanced performance-based design method, the curve classified according to different factors. The performance parameters of beams are obtained from the curves. Performance parameters can provide quantitative reference index for performance evaluation of beam.

Optimization Design Method of the Pre-Manufactured Hole of Flanging

2013 ◽  
Vol 395-396 ◽  
pp. 1206-1211 ◽  
Author(s):  
Yang Li ◽  
Zhong Lei Wang ◽  
Xiao Li ◽  
Gang Cheng
Keyword(s):  
Finite Element ◽  
Optimal Design ◽  
Finite Element Simulation ◽  
Optimization Design ◽  
Design Method ◽  
Line Length ◽  
Theoretical Formula ◽  
Equal Area ◽  
Element Simulation ◽  
Optimal Design Method

For the difficulty of calculating the size of the Pre-Manufactured hole of flanging, the formula was derived by using the theory of equal line length and the theory of equal area. And the formula was verified by finite element simulation. Due to theoretical formula has certain error, the optimal design method based on interpolation was put forward and optimization design the size of the Pre-Manufactured hole of flanging. Engineering example shows that this optimization design method is accuracy and convergence speed, and it can quickly calculate the the size of the Pre-Manufactured hole of flanging.

The Finite-Element Simulation for Reinforced Concrete Frames Including the Softening Behaviour

2011 ◽  
Vol 243-249 ◽  
pp. 204-208
Author(s):  
Wei Guo Jiang
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Design Method ◽  
Nonlinear Static Analysis ◽  
Moment Frames ◽  
Concrete Frames ◽  
Element Analysis ◽  
Softening Behavior ◽  
Performance Based Seismic Design ◽  
Seismic Design Method

In performance-based seismic design method, it is very important to have a good command of the nonlinear performance of a structural system, including in the collapse stage. In this paper, a nonlinear finite-element analysis on reinforced concrete moment frames is carried out. After studying the forces and deformations behavior in beam-column elements, the element stiffness matrix of distributed plasticity beam-column element is deduced using the Cotes scheme with 5 integration points. During the occurrence and development of plastic hinges, sections at some integration points will experience loading, unloading and reverse loading and the stiffness of these sections will experience various status. A quadrilinear form moment-curvature relationships with curvature- softening behavior and the hysteretic modes are used in the nonlinear static analysis program. The numerical analysis is carried out and the numerical results validate the load-displacement relationships and the yield mechanism of experiment frames.

Internal Forces and Steel Arrangement Analysis on the Steel Lined Reinforced Concrete Penstocks

2011 ◽  
Vol 94-96 ◽  
pp. 99-104
Author(s):  
Zhang Wei ◽  
Chuan Xiong Fu ◽  
Lu Feng Yang ◽  
Jin Zhang
Keyword(s):  
Reinforced Concrete ◽  
Axial Force ◽  
Cross Sections ◽  
Design Method ◽  
Internal Force ◽  
Concrete Wall ◽  
Inner Radius ◽  
Load Carrying ◽  
Internal Forces ◽  
Axisymmetric Structure

he steel lined reinforced concrete penstocks (SLRCP) is always looked as an axisymmetric structure according to the design code, which can not show the true load-carrying capacity when considering the dam’s constraint to the SLRCP. In this paper, the physical non-axisymmetric property of the structure is simulated using the finite element method. The internal force distribution of every cross section in the SLRCP is studied, and a design method for steel arrangement based on axial force is proposed. When considering the non-axisymmetric property, the axial force in those cross sections approaching the bottom of the structure may be reduced more than 30% to the calculated value by the axisymmetric analysis. The larger the inner radius of the penstock or the thickness of the concrete wall is, the more marked the non-axisymmetric property of the SLRCP is.

Structural Design and Analysis of Aluminum Dome for Caofeidian Coal Storage

2016 ◽  
Vol 710 ◽  
pp. 396-401 ◽  
Author(s):  
Ze Chao Zhang ◽  
Hong Bo Liu ◽  
Xiao Dun Wang ◽  
Xiang Yu Yan ◽  
Jing Hai Yu ◽  
...  
Keyword(s):  
Finite Element ◽  
Aluminum Alloys ◽  
Three Dimensional ◽  
Single Layer ◽  
Element Model ◽  
Internal Force ◽  
Structural Deformation ◽  
Mode Analysis ◽  
Finite Element Software ◽  
The Stability

The upper part of Caofeidian coal storage was approximately hemispherical aluminum shell, covered with aluminum alloys plate. The capsule was made of aluminum alloys material, and its span was 125 meters. In the design, according to TEMCOR joint, we used the finite element software MIDAS to build the accurate geometry models and calculation models of aluminum alloys single layer latticed dome structures. By the combination of constant loads, live loads, snow load, wind load, temperature effect and other working conditions, we summarized the consumption of aluminum of the structures, and studied the structural internal force, structural deformation and structural stiffness. In addition, the X and Y two different direction seismic dynamic load was applied to the structure. The structural seismic performance under two kinds of modes were studied through the structure mode analysis of the vibration frequency. The vierendeel dome and single layer dome were controlled by the stability. ANSYS three-dimensional frame element model were set up, and the eigenvalue buckling analysis was carried out. By the geometrical nonlinear finite element method, combining with initial imperfections and material nonlinear, we found out the stability coefficient and the weak parts of the structure.

Mechanical Property Analysis on Joints of Steel Secondary Beam Inserted in Reinforced Concrete Frame Girder

2012 ◽  
Vol 166-169 ◽  
pp. 3087-3094
Author(s):  
Qiong Yu ◽  
Jian Li Xu ◽  
Xing Zhuang Zhao
Keyword(s):  
Reinforced Concrete ◽  
Shear Force ◽  
Design Method ◽  
Internal Force ◽  
Joint Moment ◽  
Secondary Beam ◽  
Vertical Force ◽  
Horizontal Force ◽  
Reinforced Concrete Frame ◽  
Concrete Frame

Models for internal force analysis and strain distribution of joints of steel secondary beam inserted in reinforced concrete frame girder were analyzed. The horizontal internal force and vertical force were considered separately during calculation and analysis process. Bending-shearing correlation of vertical internal force was studied while the horizontal force wasn’t taken into account. Results show that the non-dimensional moment varies linearly with the non-dimensional shear force. Base on this, the formulas by which the joint moment and shear force are calculated are derived, and are related to depth ratio of forward to backward compression zone .And then the method to calculate joint moment capacity under horizontal force is put forward. By investigating the moment and shear force variation, the relationship between the yielding stress of the bar in the slab and the boundary concrete under the steel secondary beam crushing is identified. In the end, practical design method is proposed, and problems need further research are mentioned.

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