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Appliance of Precast Concrete Elements in Tall Buildings

2015年02月19日

硕士论文

by Eemeli Tikkanen, Finland

University of Oulu, Department of Mechanical Engineering
Advisors: Raimo Hannila Lic.Sc. (Tech.), Atte Leppänen M.Sc. (Tech.), Tuomas Jaakkola M.Sc. (Tech.), Juha Rämö M.Sc. (Tech.)
Programs used: RFEM 5, RF-STAGES, RF-DYNAM, RF-STABILITY

The appliance of precast concrete elements in constructing tall residential buildings has been investigated in this thesis when floors are composed of hollow core slabs. In this thesis, the stability of tall buildings is analyzed when all load bearing and bracing structures are precast concrete elements.

Shear walls are used as the bracing structure. The diaphragm behavior of floors composed of hollow core slabs is investigated. The thesis focuses on forces in vertical and horizontal joints between precast elements.

The appliance of mostly used joint details and connections in Finland are investigated. The connection capacities are calculated by current Finnish design principles. In addition a tall buildings horizontal displacements and dynamic movements caused by wind loading are analyzed.

Prefabricated Hollow-Box Timber Panels for Floors and Roofs

2014年12月19日

硕士论文

by Francisco Coronel, Spain

UPC / Polytechnic University of Catalonia / BarcelonaTech
Programs used: RFEM, RF-TIMBER Pro, RF-LIMITS

This thesis investigates the ability of prefabricated timber hollow-box panels that are used as slabs by comparing those that are currently on the market.

A test is perfomed using the software. In the laboratory, an alternative was made of a timber fastener to unite the elements without adhesive. When bamboo rings are placed in areas of greater stress, the resistance increases 240%.

This fact, combined with the great capacity be used for long spans, its possibility to include acoustic and thermal insulators as well as pipes and cables, easy disassembly and sustainability, makes the wooden panels an alternative that can compete with current construction systems.

"I would like to thank you for your help. Your friendly responses were helpful, timely and efficient."

Influence of Core Density in Stiffness of Sandwich Surface

2014年07月31日

硕士论文

by Vitor Dacol, Brazil

Institute of Graduate Studies - IPOG
Programs used: RFEM

In this Master thesis, the student analyzes the influence of deviation in the density of the material that is used in mechanical stiffness as core layer of a sandwich surface.

The stresses acting laterally and in the core as well as the deformations of the entire model are compared for different material densities of the core layer. The results of the analysis were contrasted with the results of the structural calculation performed in RFEM.

Due to this analysis, it is possible to verify the influence of the core layer density in the mechanical stiffness of sandwich surfaces. However, no important differences in the surfaces were observed for the density's limit deviations. The entire thesis was carried out with elastic linear conditions.

Feasibility Study on Fibre Reinforced Polymer Slides in the Eastern Scheldt Storm Surge Barrier

2013年09月1日

硕士论文

by Roeland van Straten, De Bult, Netherlands

Delft University of Technology (TU Delft)
Advisor: Prof. ir. F.S.K. Bijlaard
Programs used: RFEM, RF-LAMINATE

The Eastern Scheldt storm surge barrier is a closeable barrier in Southwest Netherlands, which should protect the Southwestern Delta from flooding from the North Sea.

The barrier is constructed with lifting steel slides, which corrode rapidly in the salty environment. The service life of the coating, which should protect the slides, is probably too short, to maintain all the slides before maintenance is neccessary.

Therefore, the state of slides can be deteriorated so much that maintenance costs exceed the costs of replacement of the slides.

Seismic Design of Bridges According to DIN EN 1998-2

2013年08月31日

硕士论文(德国)

by Julian Finkbeiner, Karlsruhe, Germany

Karlsruhe Institute of Technology (KIT)
Advisor: Dipl.-Ing. G. Maltidis
Programs used: RFEM, add-on modules

Subject of this thesis is the analysis of a three-span beam bridge in solid construction. The superstructure consists of prestressed concrete and is straight but slightly cambered. The bridge should be built in Tübingen, Germany. The city of Tübingen is situated in the Neckar valley between the Northern Black Forest and the Swabian Jura which is one of the most seismically active regions of Germany.

By means of special design methods and analyses from the earthquake standard DIN EN 1998, part 1 and 2, the thesis tries to prove that the bridge will neither collapse nor be damaged in case of seismic activities.

"Once again, I'd like to thank you for your help and support, and I also want to thank the Dlubal company for providing me with the software. It was really fun to work with the program and I've learned a lot during the creation of my thesis."

Research Concerning Simulation of Structural Behavior of Drywalls

2013年07月31日

学士论文

by Daniela Böhner, Rosenheim, Germany

Rosenheim University of Applied Sciences (HS Rosenheim)
Advisor: Prof. Dr.-Ing. Benno Eierle, Prof. Dr.-Ing. Jochen Pfau
Programs used: RFEM, add-on modules

Although drywalls represent an advantageous and promising industry, the business is facing an increasing cost and time pressure. Design attempts are both time-consuming and expensive, and in practice they are often carried out only after the wall mounting.

This is why the Bachelor thesis deals with the finite element method (FEM), which is an already proven method used in other fields, as well as the development of basic principals for simulating a drywall by using RFEM by Dlubal Sofware.

Design of Steel Roller-Coaster

2013年07月9日

硕士论文(德国)

by František Frimmer, Slovakia

Technical University of Košice, Faculty of Civil Engineering
Programs used: RFEM, RF-STEEL EC3, RF-HSS

In the graduation thesis with the title "Design of a steel roller-coaster", a detailed structural analysis of a steel roller-coaster is performed. The structure was loaded with all loads which are given in the standard. In the case of moving loads the steel structure was not loaded dynamically. The loading was simplified by the use of dynamic factors.

The whole structure was modeled in the simulator to obtain the values of the loads and speeds which were then transferred to RFEM for calculation. The duration of one ride on the roller-coaster is 1:30 min with a maximum speed of 83 km/h. The entire structure was designed for the ultimate and serviceability limit state.

Possibilities of Stiffness Determination and Frame Joint Resistance Using Analytical and Numerical Methods

2013年01月29日

硕士论文(德国)

by Marta Kurejková, Czech Republic

Czech Technical University in Prague, Faculty of Civil Engineering
Programs used: RFEM, RF-IMP, RF-STABILITY

The work is focused on a comparison of the connection design using component and finite element methods. The introduction of the thesis deals with a summary of the issues of designing the end plate bolted connections using the component method and the finite element method.

An analytical model simulation of the real connection is divided into main components, whose resistance, stiffness and deformation capacity are derived according to mechanical principles and the loading.

Resistance of the connection determined with the component method is compared with calculation results of a numerical model that includes effects of nonlinear behavior of the material. Critical component, stresses in each component and welds and distribution of forces in bolts are studied.

Design and Planning of Pedestrian Bridge Made of TRC

2013年01月18日

课程设计

Author: Abraham Brew-Sam, Germany

Dresden University of Technology (TU Dresden)
Advisors: Prof. Dr.-Ing. E.h. Manfred Curbach, Dr.-Ing. Herald Michler
Programs used: RFEM

TRC (Textile reinforced concrete) is a material that seems to mimic some of the problems faced by the traditional steel RC structures especially in the field of planar and shell elements.

With the light weight of the textile reinforcement (1.8 g/cm3), high tensile strength textile mesh (from 1000 to 3500 N/mm2), high compressive strength of the matrix (> 70 N/mm2), high corrosive resistant of the matrix, high flexural, bending and torsional strength, etc., it provides endless possibilities in the strengthening or construction of light and durable structures.

In view of this, between two existing buildings which are 16 m apart, a pedestrian bridge would be built. A TRC enclosing shell structure with an organic shape and openings along the longitudinal sides was selected. Thus, maximizing the full material benefits of the TRC and ensuring pedestrian comfort.

The bridge was modeled, analyzed and optimized using Dlubal Software program RFEM. The conclusion and output was that indeed the thin shell bridge structure can be designed with TRC but further optimized for stability by providing additional steel tie bars incorporated into a series of transverse and longitudinal ribs and also locking the ends of the bridge with a concrete frame to reduce deformations.

The properties of the main shell: Maximum Height: 4 m; Maximum Width: 3.06 m; Thickness of Shell: 0.03 m; Radius of Ribs: 0.1 m; Number of Longitudinal Ribs: 6; Average Number of Mesh Layers: 3.

Development of Modular System for Water Towers to be Installed in Disaster Areas

2012年07月17日

硕士论文

by Jonas Schmidt, Germany

University of Kassel, Department of Civil Engineering, Building Preservation and Timber Structures
Advisors: Prof. Dr.-Ing. Werner Seim, Claus Hemker (Consulting Architect, Caritas International)
Programs used: RFEM

Frequently, earthquakes and other natural disasters occur in poor regions of the earth. The drinking water supply which is often already insufficient is additionally damaged then, which causes a danger of epidemics. The drinking water supply as well as living under hygienic conditions is important for human existence.

The thesis describes the development of a modular system provided for water towers that can be installed in disaster areas. A functional, anti-seismic supporting structure was developed that is also easy to erect with a few devices and auxiliary tools by semiskilled workers under the guidance of instructors.

The development may contribute to the solution of providing a quick drinking water supply which is required after natural disasters. Moreover, it can be a supply used during the period of reconstruction and beyond. One of the great challenges was to find a way to deal with the need of tools and materials that are limited.

The markets offer only limited timber cross-sections which people have to consider for rebuilding. But also transportation and assembly must be taken into account under the given circumstances. The construction built on the university campus is designed for an earthquake intensity of 5.5, and thus intended to be an immediate measure after the main quake.

After the primary water supply, it is possible to reinforce the construction to prepare it also for main quakes measuring 7.0. The structural system was calculated with RFEM.

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Diploma Thesis with Dlubal Software

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