Aqueduct Structure Research Articles

Collision in the expansion joint effects on the seismic behavior of large-scale aqueduct

ABSTRACT Under earthquake, two beams of the aqueduct’s expansion joint may collide; thus, this will endanger the safety of the structure and even lead to girder falling accident. Quite a few studies of this issue use the simple one-dimensional model, but little takes the collision phenomenon under the action of multi-dimensional earthquake into account. According to the Contact-Impact Problems of large-scale aqueduct under earthquake action between the adjacent beam segments, a three-dimensional contact analysis model has been used to simulate the collision phenomenon. And the response of aqueduct structure collision one-dimensional seismic and multidimensional earthquake is compared; the results reveal that the three-dimensional frictional contact impact finite element model can simulate the real aqueduct structure under seismic pounding effect.

Modal parameter identification and finite element model updating of a long-span aqueduct structure based on ambient excitation

In this paper, PSV-500 laser vibration detector and 941B vibration pick-up are used to measure the ambient vibration of an actual aqueduct in China, and the peak picking method is used to identify the modal parameters of the aqueduct. The finite element model of the aqueduct is established, and a model updating method based on multi-objective optimization algorithm is proposed. Based on the sensitivity analysis, the parameters to be updated are selected. The model is updated by the fast non dominated sorting genetic algorithm, and the Pareto optimal solution set of the multi-objective optimization problem is obtained. The comparison between the measured and calculated results shows that the results of static displacement and modal parameters are in good agreement with the measured values. The result of the research shows that the static and dynamic finite element model updating method based on multi-objective optimization can achieve satisfactory results for long-span aqueduct structure, and the updated finite element model can accurately and comprehensively simulate the actual structure.

Safety Grade Evaluation of Aqueduct Structure Based on Fuzzy Cloud Theory Analysis

Safety Grade Evaluation of Aqueduct Structure Based on Fuzzy Cloud Theory Analysis

Safety Evaluation of Hyperbolic Arch Aqueduct Using Three-Dimensional Laser Scanning and Finite Element Analysis

The safety evaluation of the aqueduct in many years of operation is often performed to determine the structural operational behaviour so as to provide a scientific basis for further reinforcement or reconstruction. The missing of the original design data due to the long construction period provides great challenging in the structural safety evaluation of the aqueduct. Taking a hyperbolic arch aqueduct in China as an example, we first rebuilt the aqueduct model using the three-dimensional (3D) point cloud from the three-dimensional laser scanning technology. Coupled with the on-site safety inspection, the 3D finite element analysis was then performed to learn the stress performance of the aqueduct body and its supporting structures, so as to achieve the purpose of safety evaluation of aqueduct structure in a whole.

Optimum Design and Analysis of U-shape Thin-wall Aqueduct Based on Genetic Algorithm

In order to save project investment and reduce project quantity, the optimal design of aqueduct is the main problem in the project therefore, carrying out the optimal design and simulation analysis of U-shaped thin-walled aqueduct has important engineering application value. The paper takes Sha River aqueduct as the research object and adopts the direct search and point checking method of mixed discrete variable optimisation design. It also adopts the structural optimisation design method based on genetic algorithm and gives the optimal design scheme of U-shaped aqueduct. The optimisation design method has the advantages of fast convergence speed, high convergence efficiency and strong global search ability. The results show that, U-shape aqueduct structure is smooth, it has good mechanical properties, and the structural stress is small and can meet the strength requirement. The maximum vertical displacement of the aqueduct occurs in the middle of the span, the vertical displacement value is small, which can meet the requirement of stiffness.

Analysis of Seismic Fragility of Aqueduct Structure Based on Copula Function

Establishing the joint probability distribution function directly of the basic components in the aqueduct system is hard, because of the correlation of seismic demand among components in structural vulnerability analysis. This paper proposed a new method for analyzing the vulnerability of aqueduct structure. A two-dimensional Copula function is introduced to describe the related structures of component seismic demands and simplify the modeling process of joint distribution function. The results show that the failure probability calculated based on Copula function is between the upper and lower bounds of the first-order boundary method. The results help to simplify the modeling process of the aqueduct system vulnerability curve, and at the same time, providing a new way to study the correlation between seismic demand of aqueduct components.

Optimisation design and structure analysis of large-scale prestressed rectangular aqueduct

In order to provide theoretical basis for the design of large-scale prestressed rectangular aqueduct, saving engineering investment, and ensuring the safety and reliability of aqueduct structure. This paper adopts mixed discrete variable optimisation design method to carry out optimisation design for Sha river aqueduct of the south-to-north water diversion project, the objective function of optimisation design is project cost. Calculated results show that, optimisation design scheme of rectangular aqueduct is economic and reasonable, aqueduct structure meets the strength condition and stiffness condition, wind load has little effect for stress and deformation distribution of aqueduct, but water pressure has great effect for stress and deformation distribution of aqueduct. When stress concentration phenomenon at the junction of the longitudinal beams and transverse ribs in the rectangular aqueduct occurs, local stress is higher.

HYDRAULIC DESIGN OF AN AQUEDUCT AND ITS NECESSITY IN RAJOURI TOWN IN JAMMU AND KASHMIR

Aqueduct is the Cross drainage arrangement which make the route of water from one side of drain to the other. Most of the Rajouri town is hilly and semi-hilly belt. At Rajouri about 9000 hectares areas of land remain deprived of irrigation facilities. The main aim of the paper is to present the hydraulic design of aqueduct proposed over Darhali River in Rajouri town and explain as to why aqueduct was required in this area. To assist the growth of crops in areas adjoining to Darhali River construction of Aqueduct from left bank to Right bank of River was projected. Aqueduct of 6 X 9.5m span was proposed to be constructed. Substructure of the Aqueduct consists of the abutments, five piers and substructure of an R.C.C trough of internal size 2.0m × 2.3 m. Foundation of abutment and piers were escalated below the Scour depth level of 4m to avoid erosion and consequent damage to the structure via silting and erosion. The estimated cost of the structure was near about 90 lacs. It was found that rising of aqueduct structure shall boost farming in this area besides improving livelihood of respective land owners. The overall irrigation system of the town shall improve by constructing such a structure which was dependent mostly on rainfall.

A rainfall data analysis for the archeological drawing of the Augustan aqueduct route

Abstract Was Cumae supplied by the collection of rainwater, widely practiced for long time in the Mediterranean area, or by a branch of the Augustan Aqueduct? The main goal of Aqua Augusta was to provide water to Puteoli (civilian) and Misenum (military) that were two of the main harbors of the Empire. However, the ruins of the branch that would have flowed through Cumae have not been excavated yet. The aqueduct structure has not been studied in detail due to the difficulty in inspecting and the missing arches. A rainfall data analysis was carried out to assess the flow and use of the water conveyed by the Aqua Augusta aqueduct to Cumae. Results indicated that rainwater was not sufficient to supply Cumae and the Aqua Augusta should have played a great role in delivering water to the city.

Structural Analysis of a North China Large-Span Aqueduct with Pretensioned Steel Truss

In this paper, based on the theories of truss structure with the characteristics of the aqueduct structure, puts forward a new type of aqueduct structure system, the cable pretensioned truss structure under the use of state for the key point’s response spectrum analysis and elastic time history response analysis. The stresses induced by the analysis of structure of key parts are meeting the requirements of the current specifications, in the flexible working state. Pretensioned steel in this paper, the research aims to the whole assembly of the aqueduct structure characteristics and the theoretical analysis of the dynamic characteristics of this kind of structure design for the future research and provide some reference, so as to promote the new application and development in the form of aqueduct.

Mode Analysis and Study of Sunjiagou Aqueduct

This paper mainly adopts the finite element analysis software ANSYS to calculate and analyze the dynamic characteristic of aqueduct structure,using added mass method to deal with interaction between water and aqueduct wall, and get the natural vibration frequency and main vibration mode of U-shaped aqueduct in different water depth. The calculation result shows that water has a small effect on the vibration mode of aqueduct structure, but has a greater influence on the natural vibration frequency of aqueduct structure; natural vibration frequency of aqueduct structure decreases with the depth deepening. The research results provide the basis for the seismic design and protection of Sunjiagou aqueduct.

Structure Design and Mechanics Calculation of Aqueduct Model

Aqueduct is a conveyance structure which can across the channel, depressions, roads and railways and its conveyance water system is mainly composed of bridges, tunnels or ditch. Aqueduct is widely used in hydraulic engineering, and plays a role in irrigation ,water delivery , drainage and desilting. A large aqueduct can also be used for navigation. In the paper, based on the aqueduct design, aqueduct model making, aqueduct structure calculation and static load experiment, the whole process of design and calculation of continuous beam truss aqueduct model are performed, and the analysis of its mechanical properties are also carried on. These results are useful for the practical application of aqueduct structure.

Finite Element Analysis of Wire Net Concrete Beam-Supported Aqueduct

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.

Effect of Water Pipe Cooling on Thermal Stress of FuYang River Aqueduct Structure

In order to analyze the influence rule of water pipe cooling on the temperature field and thermal stress of large aqueduct structure, the finite element analysis model for FuYang River Aqueduct structure was established. The temperature field and thermal stress of the aqueduct structure were calculated. The following two cases were considered: structure with or without water pipe cooling, as well as the different beginning pouring months (May, June and July). The hydration-degree-based calculation methods of temperature and stress of concrete were adopted, and the high precision discrete simulation method of water pipe was used. The calculation results show that embedding the cooling pipe in concrete can effectively reduce the temperature difference between inside and outside of the early concrete and thermal stress, and is therefore effective to prevent concrete cracks. High accuracy of simulation and analysis can make people basically figure out the specific mechanism of concrete cracking and main factors even before construction, and determine accurately the structure crack location and the developing tendency.

Force Analysis of Wire Mesh Concrete U-Shaped Aqueduct

This paper adopts finite element method to carry out simulation analysis for Bachimen wire mesh concrete U-shaped aqueduct. Deducing variation law of the aqueducts stress and displacement in construction process and operational process, researching the rationality of aqueduct structure design scheme. Analysis results show that, Bachimen wire mesh concrete aqueduct structure is reasonable, force of aqueduct structure is explicit, it meets the requirements for design. The research results provide a certain reference for design of wire mesh concrete U-shaped aqueduct structure.

Simulation Analysis Reinforced Concrete U-Shaped Aqueduct

This paper adopts finite element method to carry out simulation analysis for Enzitan reinforced concrete U-shaped aqueduct. Deducing variation law of the aqueducts stress and displacement in construction process and operational process, researching the rationality of aqueduct structure design scheme. Analysis results show that, Enzitan reinforced concrete aqueduct structure is reasonable, force of aqueduct structure is explicit, it meets the requirements for design.

Finite Element Simulation Analysis of Reinforced Concrete Aqueduct

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.

Simulation Analysis of Liye Reinforced Concrete Rectangular-Sectioned Aqueduct

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

Thermal Stress Analysis of Large Scale U-Shaped Aqueduct

The aqueduct is one of large scale water conservancy project across river, which is the first level of anti-cracking structure with rigorous control of cracks. At present, the thermal analysis of aqueduct structure most borrows ideas from box-girder bridge structure without considering their difference. As the thermal stress of large-scale concrete structure during construction and operational process is redoubtable, the U-shaped model of a practical aqueduct of South-to-North Water Diversion is established to do the steady and transient thermal analyses. The result shows that the structure of U-shaped aqueduct is reasonable, it is not necessary to take special measures to control the temperature during the construction and operational process.

Analysis of wind-induced vibration of fluid–structure interaction system for isolated aqueduct bridge

This paper studies the dynamic properties of aqueduct–water coupling system in bent-type aqueduct structures using the Arbitrary Lagrangian–Eulerian (ALE) method. A three-dimensional fluid–structure interaction model was established, with plate rubber supports. The speed-time sequence of fluctuating wind acting on the aqueduct was simulated by the Auto-regressive Moving Average (ARMA) model. The natural vibration characteristics, seismic responses, and wind responses of the aqueduct structure were calculated and comparatively analyzed in different conditions of water depth. The simulation results show that the application of isolation technology can reduce aqueduct stiffness and change the vibration characteristics of an aqueduct structure. The application of isolated technique is able to elevate the earthquake resistance performance of aqueduct structure. However, the isolation remarkably increases the wind stress response and reduces wind resistance performance of the aqueduct bridge.