scholarly journals Seismic Behavior of RCC Dams Including the Effect of Foundation

2017 ◽  
Vol 7 (2) ◽  
pp. 39-43
Author(s):  
Z. Heirany
Keyword(s):  
Finite Element ◽  
Seismic Behavior ◽  
Seismic Analysis ◽  
Earth Dam ◽  
Concrete Dam ◽  
Administrative Costs ◽  
Roller Compacted Concrete ◽  
Finite Element Software ◽  
Rcc Dam ◽  
The World

AbstractRoller Compacted Concrete (RCC) dams are actually a combination of concrete dams' safety and procedure of earth dam while accelerating construction and reducing administrative costs, have high safety. And why in the world and Iran, constructing this type of dam has growing trend. The first roller compacted concrete (RCC) dam of Iran (Jegin dam) has come into operation in 2006. In terms of expressed statistics and given that, none of these dams has not been subject to severe earthquake, roller concrete dam operations is not specified in facing with severe earthquake and its merits and faults. Therefore, the need for seismic analysis of these dams in the design, implementation and operation is obvious. In the meantime, the lack of studies on how modeling of roller compacted concrete (RCC) dams using finite element software, especially on how to foundation modeling (dimensions, material properties, interaction of foundation and dam), modeling dam lake (the length of lake, the water level, the interaction between the lake and the dam body) felt. In this study, dynamic analysis of roller compacted concrete (RCC) dam using ABAQUS finite element software and modeling one of the roller compacted concrete (RCC) dams of Malaysia with the change approach of foundation boundary conditions will be considered.

scholarly journals Numerical modelling of dynamic stability of RCC dam

2018 ◽  
Vol 195 ◽  
pp. 03021
Author(s):  
Omer Mughieda ◽  
Kenan Hazirbaba ◽  
Khaldoon Bani-Hani ◽  
Wassim Daoud
Keyword(s):  
Finite Element ◽  
Structural Stability ◽  
Response Spectrum ◽  
Time History ◽  
The Body ◽  
Roller Compacted Concrete ◽  
Finite Element Software ◽  
Rcc Dam ◽  
Stability Against Sliding ◽  
The Stability

Stability and stress analyses are the most important elements that require rigorous consideration in design of a dam structure. In the current research, dynamic structural stability of a roller-compacted-concrete (RCC) dam was performed. The RCC dam was modeled using the finite element method to investigate the stability against sliding and the structural stability of the body of the dam. The commercially available finite element software (SAP 2000) was used to analyze stresses in the body of the dam and foundation. A linear finite element dynamic analysis was performed. Response spectrum and time history methods were used with different earthquake loads. The response spectrum of the 1995 Aqaba earthquake and a representative elastic-spectrum with smooth plateau for both Operating Basis Earthquake (OBE) and Maximum Credible Earthquake (MCE) were used in this study. The analysis was carried out assuming that no slip will occur at the interface between the dam and the foundation. The greatest tension was found to develop in the rock adjacent to the toe of the upstream slope. The factor of safety against sliding along the entire base of the dam was found to be greater than 1 (FS>1), for both loading conditions.

Three-Dimensional Seismic Analysis on Reactor Structure

2010 ◽  
Author(s):  
Naibin Jiang ◽  
Feng-gang Zang ◽  
Li-min Zhang ◽  
Chuan-yong Zhang
Keyword(s):  
Finite Element ◽  
Large Scale ◽  
Seismic Analysis ◽  
Three Dimensional ◽  
Element Model ◽  
Earthquake Excitation ◽  
Finite Element Software ◽  
Reactor Structure ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

The seismic analysis on reactor structure was performed with a new generation of finite element software. The amount of freedom degree of the model was more than twenty millions. The typical responses to operational basis earthquake excitation were given. They are larger than those with two-dimensional simplified finite element method, and the reasons of this phenomenon were analyzed. The feasibility of seismic analysis on large-scale three-dimensional finite element model under existing hardware condition was demonstrated, so some technological reserves for dynamic analysis on complicated equipments or systems in nuclear engineering are provided.

Analysis on Self-Centering Capacity of Prefabricated Frame Joints

2014 ◽  
Vol 580-583 ◽  
pp. 1471-1476
Author(s):  
Yun Zou ◽  
Hui Lin ◽  
Wei Qiang Ma
Keyword(s):  
Finite Element ◽  
Seismic Behavior ◽  
The Self ◽  
Finite Element Software ◽  
Analysis Models ◽  
Post Tensioned

In order to research the self-centering capacity of prefabricated frame joints, this paper designed analysis models of prefabricated frame joint with the finite element software ABAQUS, contrastively analyzed seismic behavior of joint applied pretention and joint without pretention. Joint applied pretention is found to have better self-centering capacity. Then the paper calculated and analyzed the factors of stretching control stress, number of post-tensioned steel. The results show that number of post-tensioned steel has a greater influence on the seismic behavior of the structure, and the stretching control stress has influence in a certain range. The results have some degree of guiding significance for the popularization of prefabricated frame.

Study on the Seismic Behavior of Buckling Restrained Braced Steel Frames

2012 ◽  
Vol 446-449 ◽  
pp. 409-413 ◽  
Author(s):  
Guo Qi Liu ◽  
Jian Song
Keyword(s):  
Finite Element ◽  
Energy Consumption ◽  
Seismic Behavior ◽  
Steel Frames ◽  
Steel Frame ◽  
Main Structure ◽  
Finite Element Software ◽  
Suitable Solution

This paper presents a suitable solution of studying on the performance of energy consumption of BRB. The hysteretic curve of BRB is got with finite element software, and is lead into steel frame by virtual hinge. The results show that the BRB has more advantages in reducing the structural displacement and protecting the safety of the main structure compared with the general braces.

scholarly journals Study on Crack Resistance of Hydraulic Roller Compacted Concrete Dam with Fly Ash Admixture

2021 ◽  
Vol 293 ◽  
pp. 02025
Author(s):  
Xiaogang Li
Keyword(s):  
Fly Ash ◽  
Crack Resistance ◽  
Construction Industry ◽  
Continuous Improvement ◽  
Concrete Dam ◽  
Construction Engineering ◽  
Roller Compacted Concrete ◽  
Rcc Dam ◽  
Preparation Stage ◽  
Roller Compacted Concrete Dam

With the continuous improvement of the level of construction industry in modern industry, at the same time, the requirements of the construction industry for the crack resistance of concrete dams are also higher and higher. In the preparation stage of the experiment, the corresponding experimental materials and equipment are provided. In order to ensure that the concrete can meet the requirements of workability and strength grade, the proportion of materials is designed; During the experiment, the activity characteristics of fly ash admixture are extracted, the particle size distribution of admixture is tested, and the fracture data of hydraulic RCC dam is monitored; The experimental results show that when the ratio of cement and fly ash is 0.7:0.1, the number, width and area of concrete cracks are the minimum, which proves that the fly ash admixture under this ratio is more suitable for construction engineering.

The effect of construction designs on temperature field of a roller compacted concrete dam — a simulation analysis by a finite element method

2003 ◽  
Vol 30 (6) ◽  
pp. 1153-1156 ◽  
Author(s):  
Y L Chen ◽  
C J Wang ◽  
S Y Li ◽  
L J Chen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Temperature Field ◽  
Simulation Analysis ◽  
Thermal Simulation ◽  
Maximum Temperature ◽  
Mass Concrete ◽  
Roller Compacted Concrete ◽  
Rcc Dam ◽  
Element Method

In this paper a numerical simulation of the construction process of roller compacted concrete (RCC) dams is presented. The following features of construction of mass concrete have been considered: hydration heat, age, placing temperature, starting placement date, and placing speed. A 3-D finite element model of the Long-Tan RCC dam, which is to be built in the Guangxi Autonomous Region in China, was analyzed. Temperature distribution and evolution inside the RCC dam were calculated during and after the completion of the dam. Using FortranTM code, a 3-D thermal simulation analysis of a high RCC dam can be realized on a computer at the construction site. Based on the real factors during the construction period, engineers can predict the distribution of temperature in the RCC dam. Therefore, engineers can take appropriate measures to control concrete temperature to reduce thermal stress within the dam. The effects of the concrete placing temperature, construction speed, and starting date on the temperature are discussed. It has been found that the maximum temperature in a dam can be reduced by 20% through temperature control measures.Key words: RCC dam, thermal simulation analysis, finite element method, temperature field, construction schedule.

Study on Finite Element Method for Simulating Seismic Behavior of New All-Bolted Semi-Rigid Connection

2013 ◽  
Vol 671-674 ◽  
pp. 1494-1497
Author(s):  
Xin Zhao ◽  
Mai Wu ◽  
Xiang Shang Chen ◽  
Guang Wei
Keyword(s):  
Finite Element ◽  
Seismic Behavior ◽  
Research Work ◽  
Steel Tube ◽  
General Purpose ◽  
Fe Model ◽  
Fe Method ◽  
Geometry Model ◽  
Finite Element Software ◽  
Rigid Connection

Using the APDL language of ANSYS which is the large general-purpose finite element software, the finite element (FE) model of new bolted beam-to-column connection for concrete-filled square steel tube (CFST) is established. The simulated analysis for the seismic behavior of the new semi-rigid connection under low-cycle reverse loading is carried out by the FE method. It is focus on the method study on establishing geometry model, selection of element and its parameter, setting up boundary restraint and solution during FE analysis. Through comparision it is found that the calculated values and the experimental results are very close, which verifies the correctness and rationality of the method in this paper. The research work provides fundamental basis for future intensive study on seismic behavior of the new connection.

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