scholarly journals Design Optimization of Concrete Aqueduct Structure considering Temperature Effects

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Liang-ze-nan Wang ◽  
Chao Su
Keyword(s):  
Construction Projects ◽  
Three Dimensional ◽  
Design Parameters ◽  
Reinforced Concrete Structure ◽  
Original Design ◽  
Engineering Construction ◽  
Field Coupling ◽  
Dimensional Finite Element ◽  
Water Conveyance ◽  
Three Dimensional Finite Element

An aqueduct is a water conveyance structure that enables channel flow across canals, valleys, depressions, roads, and other structures. The optimal structural selection of the aqueduct is particularly important to ensure engineering quality and optimize project investment. To optimize the design of an aqueduct structure, this study established a mathematical model based on the three-dimensional finite element method that considers the temperature field and structural stress field coupling among its design parameters. The model was used to optimize and design the main wall thickness and tie spacings of the aqueduct structure. The Caohe aqueduct was considered as an example for the proposed design. The influences of temperature-induced stress on the reinforced concrete structure of the aqueduct in winter and summer were investigated based on the actual engineering conditions of the structure, and the corresponding structural optimization was obtained. The results showed that the optimized aqueduct can offset temperature and structural stresses, thus reducing the amount of material required. The maximum generated stress was also lower than that of the original design. Furthermore, this study is expected to provide guidance for similar engineering construction projects.

Recheck Calculation of Dahedong Trench-Buried Inverted Siphon Structure

2014 ◽  
Vol 488-489 ◽  
pp. 589-592
Author(s):  
Min Tan
Keyword(s):  
Finite Element ◽  
Simulation Analysis ◽  
Process Analysis ◽  
Three Dimensional ◽  
Inverted Siphon ◽  
Operating Process ◽  
Element Simulation ◽  
Dimensional Finite Element ◽  
Water Conveyance ◽  
Three Dimensional Finite Element

Inverted siphon structure is a common water conveyance buildings, computer as a efficient computational tool is used, this paper adopt finite element method to carry out three-dimensional finite element simulation analysis for Dahedong inverted siphon structure. Deducing variation law of the inverted siphons stress and displacement in construction process and operating process. Analysis results further verified that design scheme is reasonable and safe, it has certain application value.

Studies for Deformation of Slurry Shield Construction under Across and Parallel Existing Tunnel

2012 ◽  
Vol 204-208 ◽  
pp. 1435-1438
Author(s):  
Yong Qi Ma ◽  
Yin Ning ◽  
Yi Dong ◽  
Feng Lin Wu
Keyword(s):  
Three Dimensional ◽  
Ground Surface ◽  
Initial Position ◽  
Practical Significance ◽  
Engineering Construction ◽  
Dimensional Finite Element ◽  
Survey Results ◽  
Three Dimensional Finite Element ◽  
Slurry Shield ◽  
Surface Settlements

The method combining the construction survey and the numerical simulation is proposed in the paper to accurately obtain the deformation of the slurry shield construction under across and parallel existing tunnel. The surface settlements of the engineering construction initial position are surveyed. The reliability of the three dimensional finite element models is verified by comparing with the survey results. The deformation variation of the existing tunnel and ground surface are obtained by the elastoplasticity nonlinear calculations, showing the feasibility and effectiveness of the proposed method and the credibility and accuracy of the calculated results. Meanwhile, the measures of control deformation are presented. The surveyed settlements after the construction process of implementing measures are smaller than those calculated, indicating the effect obviously of the measures which has practical significance.

scholarly journals Experimental and Numerical Analysis of The Used Hollow Slab

2018 ◽  
Vol 175 ◽  
pp. 01036
Author(s):  
Xudong Hua ◽  
Xingwei Xue ◽  
Junlong Zhou ◽  
Hai Zhang
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Three Dimensional ◽  
Reinforced Concrete Structure ◽  
Analysis Model ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Long Time ◽  
Bending Capacity ◽  
Three Dimensional Finite Element

The actual bearing capacity of a bridge in active service is crucial to the structure, but such data is generally difficult to obtain. In order to obtain the actual ultimate bending capacity of the used hollow slab, a destructive test of a hollow slab, which has been used ten years, has been carried out. Moreover, based on the experimental analysis of the material parameter data, a three-dimensional finite element nonlinear analysis model of the used hollow slab was established. Through the experiment and finite element analysis of the used hollow slab, the comparisons of the failure mode, crack propagating and ultimate bending capacity were focused on. The main conclusions obtained through the study are as follows: (1) Strand is a kind of stable prestressed material, which can maintain good mechanical properties for a long time; (2) The used hollow slab still maintains good ultimate bending capacity, although underwent a decreased rigidity due to long-term cumulative damage; (3) The total strain fracture model is qualified for simulating the nonlinearity of concrete material, and can obtain the ultimate bearing capacity of reinforced concrete structure effectively as well as simulates the development of cracks well.

Crack Mechanism, Temperature Control, and Anti-Cracking Measures of Sluice

2013 ◽  
Vol 405-408 ◽  
pp. 1217-1220
Author(s):  
Zhen Hong Wang ◽  
Guo Xin Zhang ◽  
Shu Ping Yu
Keyword(s):  
Temperature Control ◽  
Three Dimensional ◽  
Control Measures ◽  
Construction Technology ◽  
Element Analysis ◽  
Engineering Construction ◽  
Simulation Calculation ◽  
Project Construction ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

To address the problem of sluice concrete easily cracking during construction, this study introduces the crack mechanism of concrete structures. Temperature differences and constraints are the main causes of cracks. Anti-cracking measures should focus on optimizing concrete mixing ratio and improving construction technology. Using simulation calculation to model the actual construction process and temperature control measures, this study analyzes the causes of crack and selects timely and reasonable temperature control measures, which are necessary links in engineering construction. A three-dimensional finite element analysis was conducted for a huge concrete sluice structure. The causes of cracks are discussed, and timely and feasible anti-cracking measures are proposed to provide technical support for project construction.

Three-Dimensional Finite Element Analysis of Henggangling Buttress Type Inverted Siphon

2013 ◽  
Vol 804 ◽  
pp. 343-346
Author(s):  
Dong Yu Ji
Keyword(s):  
Finite Element ◽  
Simulation Analysis ◽  
Process Analysis ◽  
Three Dimensional ◽  
Reference Value ◽  
Element Analysis ◽  
Inverted Siphon ◽  
Dimensional Finite Element ◽  
Water Conveyance ◽  
Three Dimensional Finite Element

nverted siphon structure is a common water conveyance buildings, this paper adopts finite element method to carry out three-dimensional finite element simulation analysis for Henggangling buttress type inverted siphon structure. Deducing variation law of the inverted siphons stress and displacement in construction process and operational process. Analysis results further verified that design scheme is reasonable and safe, it has certain reference value. Henggangling buttress type inverted siphon structure is safety, it meets the requirements for engineering.

A Parametric Study on Particulate Al-SiC Composite Bolted Joints

2006 ◽  
Author(s):  
Samir N. Shoukry ◽  
Jacky C. Prucz ◽  
Gergis W. William
Keyword(s):  
Load Transfer ◽  
Three Dimensional ◽  
Closed Form Solution ◽  
Lap Joints ◽  
Form Solution ◽  
Bolted Joints ◽  
Design Parameters ◽  
Dimensional Finite Element ◽  
Sliding Interfaces ◽  
Three Dimensional Finite Element

The main objective of this study is to predict theoretically the stress distributions around the holes in a bolted joint made of particulate metal matrix composite and to investigate the associated load transfer efficiencies both for a single and double lap bolted joints. A three-dimensional finite element parametric model has been developed to examine the effects of various design parameters on the structural performance of such joints. The main feature of this model is explicit modeling of the sliding interfaces between the connected plates and the washers, and those between the hole and the bolt. The model response showed an excellent agreement with a closed form solution as well as experimental data. The results indicated that unsymmetric configuration of single lap joints causes bending as the load is applied, which is opposite of the double lap joints. This research quantifies the relationship between the stress developed around the hole and washer diameter, tightening pressure, and clearance between the bolt and hole. It was also observed that variations in Young's modulus have no significant effect on the stress concentration around the hole.

Dynamic Impact Simulation Study of Tubeless Pneumatic Tires

2016 ◽  
Author(s):  
Floyd Linayao ◽  
Raymond K. Yee
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Design Parameters ◽  
Inflation Pressure ◽  
Element Analysis ◽  
Finite Element Program ◽  
First Case ◽  
Dimensional Finite Element ◽  
Element Program ◽  
Three Dimensional Finite Element

Traditionally speaking, prototype tires are designed, and then tested on an experimental basis to evaluate performance. Using finite element analysis instead allows tire design parameters to be modified at will and underperforming architectures to be ruled out. This paper characterizes the dynamic response of a tubeless pneumatic vehicle tire as it is exposed to sudden impact and determines conditions under which failure would occur. Three cases were studied using a 175SR14 passenger tire, since passenger tires are most commonly used and impacts are more substantial on smaller tires. ABAQUS finite element program was used to perform nonlinear transient dynamic three-dimensional finite element analyses for three commonly tire encountered conditions. The first case, direct curb impact, determined that a safe inflation pressure range for tire velocities exists between 10 and 60 km per hour (kph). The second case, angled curb impact, found a smaller range of 10 to 40kph. The third case, impact with a pothole, found that at low inflation pressures, less stress is produced at higher velocities; increasing inflation pressure results in a transition point, causing larger stresses to be produced at higher velocities. From these analyses, several conclusions are drawn: inflation pressures below 100KPa do not produce a useful relationship between tire velocity and stress; thicker sidewalls help shield the tire from impact failure; and it is better for the tire to accelerate past a pothole in the 30 to 70kph range.

Finite Element Simulation Analysis of Reinforced Concrete Aqueduct

2013 ◽  
Vol 394 ◽  
pp. 323-326
Author(s):  
Min Tan
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Element Simulation ◽  
Simulation Analysis ◽  
Process Analysis ◽  
Three Dimensional ◽  
Element Simulation ◽  
Dimensional Finite Element ◽  
Water Conveyance ◽  
Three Dimensional Finite Element

Aqueduct is a important water conveyance buildings, this paper adopts finite element method to carry out three-dimensional finite element simulation analysis for Songxijiang reinforced concrete rectangle beam-supported aqueduct. Researching variation law of the aqueducts stress and displacement in construction process and operational process. Analysis results show that, structure of Songxijiang reinforced concrete rectangle beam-supported aqueduct is reasonable, force of aqueduct structure is explicit, it meets the requirements for engineering.

Optimal Design of the Curvilinear Tapered Coat-Hanger Die

2011 ◽  
Vol 121-126 ◽  
pp. 1014-1018
Author(s):  
Kai Meng ◽  
Zi Long Zhao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Coefficient Of Variation ◽  
Three Dimensional ◽  
Evolution Strategy ◽  
Design Parameters ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Curve Equation ◽  
Element Method

A preliminary study of optimal designing the curvilinear tapered coat-hanger die is conducted by the method of evolution strategy combined with the finite element method. The design parameters are searched according to the evolution strategy and the objective function is achieved by the three-dimensional finite element method. Design results are attractive in very low coefficient of variation of polymer flow velocity at the die outlet. It shows that the provided method is feasible and effective in the design of the curvilinear tapered coat-hanger die. However, For the purpose of decreasing the coefficient of variation value further, both the curve equation and the tapered equation of the manifolds should be considered.

Finite Element Analysis of Wire Net Concrete Beam-Supported Aqueduct

2014 ◽  
Vol 488-489 ◽  
pp. 573-576
Author(s):  
Ke Ding Liu
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Concrete Beam ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Element Analysis ◽  
Operating Process ◽  
Dimensional Finite Element ◽  
Water Conveyance ◽  
Three Dimensional Finite Element

Aqueduct is a common water conveyance buildings, this paper adopts finite element method to carry out three-dimensional finite element simulation analysis for Shengli wire net concrete beam-supported aqueduct. Researching variation law of the aqueducts stress and displacement in construction process and operating process, the research results offer some reference for design and construction of reinforced concrete U-shaped beam-supported aqueduct. The analysis results show Shengli reinforced concrete aqueduct structure is economic and reasonable, structure is safe and reliable.

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