12 Articles Published

1. DAM BREACH PARAMETERS AND ITS EFFECTS ON PROPAGATION OF FLOOD WAVE IN THE DOWNSTREAM

Authors: K C PATRA

Abstract: our society gets huge benefits from the water storage dams, but the consequences are devastating if a dam fails. It causes extensive damage to the life and properties mostly due to short warning time. Important factors governing failure studies are the breach parameters that help to quantify the risk associated with dam break floods. Many empirical equations have been developed for predicting the breaching parameters associated with peak outflow and these equations are generally developed by regression analysis from the record of dam failure data. In the present work, a hypothetical failure of dam is modelled using MIKE 11. The required inputs in terms of PMF, river cross sections, area-elevation-capacity curves, Stage-Discharge data and dam specifications are provided for modelling. Towards this, data from Sarabgarh dam project in Orissa is used to model the breach parameters and propagation of flood waves in the downstream reaches using Mike 11 and other software. The flood hydrograp

Keywords: Dam safety, Mike 11, Breach parameters, Flood hydrograph, Flood wave

Pages: 1 - 5 | DOI: 10.15224/978-1-63248-154-2-08

2. AN EXPERIMENTAL STUDIES ON HIGH SEISMIC PERFORMANCE SHEAR WALLS

Authors: WEN-I LIAO

Abstract: Past RC wall panel tests of reinforced concrete membrane elements under reversed cyclic loading have much greater ductility when steel bars are provided in the direction of principal tensile stress. In order to improve the ductility of shear walls under earthquake loading, high seismic performance shear walls have been proposed to have steel bars in the same direction as the principal direction of applied stresses in the critical regions of shear walls. This paper presents the test results of two shear walls under shake table excitation and two shear walls under reversed cyclic loading. In the specimens under shake table tests, steel bars were provided at angles of either 90 degrees or 45 degrees to the horizontal. In the reversed cyclic tests, one-half of the steel bars were placed at an angle of 45 degrees to the horizontal in the low-rise shear wall and at an angle of 65 degrees to the horizontal in the bottom portion of the mid-rise shear wall. Based on the experimental results, th

Keywords: shear wall, reinforced concrete, ductility, cyclic loading, shake table

Pages: 6 - 11 | DOI: 10.15224/978-1-63248-154-2-09

3. DISCHARGE MODELING IN SMOOTH AND ROUGH COMPOUND CHANNELS USING GENETIC PROGRAMMING

Authors: ALOK ADHIKARI

Abstract: Discharge results observed from the experimental channels for smooth and rough surfaces, along with data from a compound river channel are used in the Genetic Programming. Model equations are derived for predic12tion of discharge in compound channel16 for various types of channel surfaces. Five hydraulic parameters are used for developing the model equations. Models derived are tested and compared with other soft computing techniques. Evaluations of all the approaches are carried out using five performance parameters. Finally, the effect of parameters responsible for the flow behavior is shown through sensitivity analysis. GP is found to give the most prom10.15224/978-1-63248-154-2-10ising results. This work aims to benefit the researchers engaged in modeling of discharge using machine learning techniques.10.15224/978-1-63248-154-2-10

Keywords: cnn, fuzzy, ces, anfis, gp

Pages: 12 - 16 | DOI: 10.15224/978-1-63248-154-2-10

4. STIFFNESS COEFFICIENTS FOR CAISSON FOUNDATIONS SUPPORTING OFFSHORE WIND ENERGY CONVERTERS

Authors: AISSA MOHAMMED HEMZA

Abstract: A wide range of novel Offshore applications are emerging in the energy sector. Actually, Offshore Wind Energy is one of the most attractive sources of renewable energy. During the last decade, Offshore Wind Turbines were extensive application throughout the worldwide. However, the efficiency of Offshore Wind Turbines especially foundations in one of the currently challenges. In the past, suction caissons have been widely used in oil and gas structures. Recently it is attempted to be used as support structures for Offshore Wind Turbines. Similarly to conventional monopiles, suction caissons supporting Wind Turbines experience lateral displacement mainly due to wind and waves, though studies show that caissons have more long term performance against loading. This paper aims for highlighting the stiffness behavior of caissons in the elastic domain supporting Wind Turbines using the Fourier Series Aided Finite Element Method (FSAFEM) through sensitivity analysis considering the geometry of

Keywords: Caissons, Wind Turbines, Stiffness, Finite Element Analysis.

Pages: 17 - 21 | DOI: 10.15224/978-1-63248-154-2-11

5. ADVANCED METHOD FOR STATION POINT CONTROL ACCURACY TO MONITOR THE BEHAVIOUR IN SERVICE STAGE OF CIVIL ENGINEERING STRUCTURES USING GEODETIC SATELLITE TECHNOLOGY

Authors: DIANA-IOANA MORARIU , DANIEL LEPADATU

Abstract: The monitoring of important engineering buildings is mandatory and necessary especially in crowded urban areas. Achieving a stable and optimal monitoring network leads to a more effective time monitoring of objectives through the use of satellite methods. Satellite geodetic technology along with emerging technologies is a modern way to get data on civil buildings monitored with reasonable accuracy. Thus, the fast evolution of communication technologies allowed and developed several satellite constellations throughout the Globe at the same time, depending on the needs and economic power of owners. In the present scientific paper, we will describe an analysis of the accuracy of data obtained with the use of satellite technology for monitoring the behavior of an engineering building using Romanian Positioning System (ROMPOS) based on satellite systems such as: Global Navigation Satellite System (GNSS), Russian GLONASS and European Galileo, but also on GNSS permanent stations, obtaining re

Keywords: GPS, GLONASS, Bei Dou, Civil Engineering, monitoring behaviour in service stage, station points control

Pages: 22 - 26 | DOI: 10.15224/978-1-63248-154-2-12

6. ASSESSMENT OF THE DYNAMIC RESPONSE OF BUILDINGS: EXPERIMENTAL MONITORING AND FEM SIMULATIONS

Authors: L. DE S. BASTOS

Abstract: Numerical analysis using FEM (Finite Element Method) simulations is part of the everyday routine in many academic centres and structural design. However, one of the main problems to do this task is related to the numerical modelling reliability, aiming to represent the investigated structure real behaviour. This way, in this investigation experimental methodologies allow characterizing the proposed physical structural model of a 19 story building, constructed in laboratory, based on the use of HDF (High Density Fibreboard). In sequence, aiming to validate the motion equations of the structural system, both numerical and experimental dynamic responses of the physical model were correlated. The results are presented in terms of modal parameters, frequency response functions (FRFs) and time history. The good agreement between the numerical and experimental results can corroborate the adequate use of the developed numerical model.

Keywords: Buildins, Dynamic Analysis, Experimental Dynamic Monitoring

Pages: 27 - 32 | DOI: 10.15224/978-1-63248-154-2-13

7. BEHAVIOR OF SCREEN-GRID INSULATED CONCRETE FORMS (ICF) REINFORCED CONCRETE WALLS UNDER SEISMIC LOADS

Authors: YOSRA H. EL MAGHRABY

Abstract: The current research addresses Screen Grid Insulated Concrete Forms (ICF) Reinforced Concrete walls, an innovative system that combines structural strength and sustainability. The system however is still developing with relatively few researches and yet not acknowledged by several design codes. The aim of this work is to further evaluate the structural behavior of SGICF walls. Results of this research may lead to and performed. The test program consisted of six walls that were divided into two sets. The first set was tested under combined axial and lateral monotonic load and the second set was tested under combined axial and cyclic lateral load. Each set consisted of three walls; a wall without openings, one with a window opening and the other with a door opening. The configuration and reinforcement of the walls in the two sets were similar. This part of the research aims at understanding the effect of seismic loading on SGICF walls. Accordingly, a cyclic loading experimental program w

Keywords: Screen Grid ICF, In-plane monotonic loading, In-plane cyclic loading, Grid size, Presence of openings.

Pages: 33 - 37 | DOI: 10.15224/978-1-63248-154-2-25

8. ANALYSIS PERFORMANCE COST AND IMPLEMENTATION WITH EARNED VALUE METHOD

Authors: HERBY CALVIN PASCAL TIYOW

Abstract: Earned Value Method is a method developed to determine the progress of the project based on the progress that has been achieved. This method will provide very useful information when applied to evaluate project progress in order to identify potential slippage and use of budget overruns. The concept of an earned value has three main components: the budget cost, the actual cost, and a value derived from the cost that has been issued or called the earned value. The research was carried out on the project of Faculty of Engineering Development of Hasanuddin University in Makassar, South Sulawesi. The research method is an intrusive analysis by analyzing project performance after the 13th week. The results showed that the application of the earned value method showed that the project time performance from the first week to the 13th week experienced several deviations, ie at the 4th, 8th and 13th weeks. So the project has decreased time performance at a cost that is less than the budget.

Keywords: Cost, Performance, Implementation, Earned Value

Pages: 38 - 43 | DOI: 10.15224/978-1-63248-154-2-26

9. INVESTIGATING THE RISK PREVENTIVE AND MITIGATIVE METHODS USED IN GAUTENG, SOUTH AFRICA: EVIDENCE FROM CONTRACTORS

Authors: NAZEEM ANSARY

Abstract: This study sought to investigate the effectiveness of risk management methods used in construction projects according to contractor’s perspective. Literature search and questionnaire surveys were carried out, and a total of thirteen risk management actions were identified which were further categorized into two groups of preventive and mitigative actions. Research findings identified subjective judgment to produce a proper programme and production of a proper schedule as mostly used actions to manage risks in the first group. Furthermore, close supervision, increase the working hours and coordinate closely with subcontractors were the most used actions to manage risks in the latter group. The results of this study would considerably boost the understanding of risk management actions and also assist contractors in handling various risks faced by the industry.

Keywords: construction, contractors, preventive and mitigative actions, South Africa.

Pages: 48 - 52 | DOI: 10.15224/978-1-63248-154-2-28

10. THE EXTENT TO WHICH RISK IDENTIFICATION LEADS TO PROJECT PERFORMANCE OF SMALL AND MEDIUM CONTRACTORS IN GAUTENG, SOUTH AFRICA.

Authors: NAZEEM ANSARY

Abstract: Risk management has been acknowledged as an area of concern in the management of construction project risks. One of the critical phases of the risk management process is risk identification, for if risks are not identified, they can have an adverse impact on the successful completion of projects. There appears to be little evidence of studies highlighting the correlation between project risk identification and project performance in South Africa construction industry, especially among small and medium contractors. Therefore, the current study aims to investigate the extent to which project risk identification leads to project performance of SMEs construction project in Gauteng, South Africa. Data were collected through a questionnaire survey among SMEs who were conveniently sampled in Gauteng. Descriptive and inferential statistics were used to analyze data collect. Findings revealed that there is a positive significant relationship between project risk identification and project perfo

Keywords: contractors, project performance, risk identification, South Africa

Pages: 53 - 58 | DOI: 10.15224/978-1-63248-154-2-29

11. CONTROL SYSTEM STRATEGIES FOR VIBRATION ASSISTED GRINDING MACHINE

Authors: HEISUM EWAD

Abstract: Grinding is usually the last finishing operation to be completed on the work piece and hence any deviations in quality such as geometrical errors and surface finish cannot be passed onto the next operation. Grinding is classified as a machining process that removes material from the work piece using similar principles to that of milling or turning. However, instead of having the one large cutting edge, there are numerous small cutting edges by way of grits on the grinding wheel surface, with all of them working together at extremely high speeds. One of the main problems in grinding is the growing vibration (Chatter) between wheel and work piece during the process. Many studies and tests have been made in order to detect and avoid this dynamic phenomenon which affects a number of parameters including wheel wear and work piece quality. However, a possible method to prevent this type of chatter is to apply a periodic disengagement of the wheel from the work piece and periodic variation of

Keywords: Design of Controller, Experimental Result, Model Identification from the Data, Power Consumption.

Pages: 59 - 62 | DOI: 10.15224/978-1-63248-154-2-30

12. CAUSES OF FILTRATION THE WATER IN ROLLER COMPACTED CONCRETE DAMS (RCC)

Authors: J. O. MORANDI

Abstract: Roller compacted concrete (RCC) dam construction involves placing by compaction vibratory of concrete in successive layers of 30 to 45 cm thick. The RCC is a permeable material, especially on the surfaces of contact between layers, which are flat or together of potential weakness for the material. This constructive technology generates two areas of transition with RCC body dams it. A with the face of mass vivrate concrete (MVC) and the other with the rock of the footboard. The impermeability of the dam must rely to a thin layer of MVC, of the order of 0, 70m to 1, 30m thick, which forms a waterproof wall in contact with the water of the reservoir. It is complemented by joint water stop placed in the joints between blocks. A crack in the wall or placement joints defects water stop will allow the entrance of water to the body of the dam. If the constructive joints and transition areas were not resolved correctly, they will operate as preferential pathways of spatially connected at all th

Keywords: Concrete Roller Compacted (RCC) * Dams

Pages: 44 - 47 | DOI: 10.15224/978-1-63248-154-2-27