Construction of Deep Drilling Rig, Germany
As the geothermal energy market is continuously increasing, BAUER Maschinen GmbH, a German company working in the field of specialist foundation engineering, has developed a new deep drilling rig. Dlubal Software's German customer Ing.-Büro H.-U. Möller was in charge of the plant's structural analysis. The system is used to make borings reaching to a depth of 22,965 ft in the area of geothermal energy, oil, or gas.
Ing.- Büro H.-U. Moller, Minden, Germany
BAUER Maschinen GmbH, Schrobenhausen, Germany
In addition, it is possible to extend existing boreholes using modern boring technology. The boring device is built in Germany and distributed worldwide.
The deep drilling rig has the following dimensions: L x W x H = 82 ft x 39 ft x 137.7 ft. The mass of the entire structure is 639 t. It has a modular structure which enables transport on a truck.
The plant is self-erecting in parts and can be shifted from one bore hole to the other when built up. The drill bit is driven into the earth by a maximum rotary drive of 60°kNm and pulled out by a maximum force of 989,159 lbs.
The model consists of 1,137 nodes and 2,052 members forming a lattice tower with the shape of a U. The guide is applied on the open U‑side.
For their calculation, the engineers have analyzed six RSTAB models with different loads and states such as plant in and out of operation with concentrated support and tension failure, lying tower, lifting of tower, mounting of winch, etc.
The structural system and loading were entered in a basic system. Then, all systems to be analyzed were derived from the base system. To determine the maximum internal forces and stresses, the six models were superimposed in a super combination.
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The calculation of complex structures by means of finite element analysis software is generally performed on the entire model. However, the construction of such structures is a process carried out in multiple stages where the final state of the building is achieved by combining the separate structural parts. To avoid errors in the calculation of overall models, the influence of the construction process must be considered. In RFEM 6, this is possible by using the Construction Stages Analysis (CSA) add-on.
RFEM/RSTAB add-on module RF-/STEEL BS | Design of steel members according to BS 5950 or BS EN 1993-1-1
RFEM add-on module RF-LOAD-HISTORY | Consideration of plastic deformations from previous load conditions
RFEM/RSTAB add-on module RF-/FE-LTB | Lateral -torsional buckling analysis according to theory II. Order (FEM)
RF-/HOHLPROF add-on module for RFEM/RSTAB | Ultimate limit state designs of welded hollow section connections according to EC 3
Compared to the RF-/STEEL EC3 add-on module (RFEM 5/RSTAB 8), the following new features have been added to the Steel Design add-on for RFEM 6 / RSTAB 9:
- In addition to Eurocode 3, other international standards are integrated (e.g. AISC 360, CSA S16, GB 50017, SP 16.13330)
- Consideration of hot-dip galvanizing (DASt guideline 027) in the fire protection design according to EN 1993-1-2
- Input option for transverse stiffeners that can be taken into account in the shear buckling analysis
- Lateral-torsional buckling can also be checked for hollow sections (e.g. relevant for slender, high rectangular hollow sections)
- Automatic detection of members or member sets valid for the design (e.g. automatic deactivation of members with invalid material or members already contained in a set of members)
- Design settings can be adjusted individually for each member
- Graphical display of the results in the gross section or the effective section
- Output of the used design check formulas (including a reference to the used equation from the standard)
- How do I perform stability analysis to determine the critical load factor in RFEM 6?
- How can I optimize cross-sections within the steel design?
- Where can I find the materials for the corresponding National Annexes in RFEM 6 and RSTAB 9?
- How do I apply wind load on members of open structures?
- Is it also possible to use RF‑/TOWER Loading without the other TOWER add-on modules?
- I do not want to design a cross-section in the RF‑/STEEL EC3 add-on module. Can I quickly remove this cross-section from the selection?
- I have a roof structure resting on a steel column that runs to the foundations. The column runs through a perimeter wall that supports the false ceiling. A considerable part of the load from the roof is transferred to the wall. I want the steel column to carry all the vertical loads from the roof. How can I do it?
- Are the models and presentations from Info Day 2018 freely available, and can you send them to me?
- I encountered a sharing violation while importing a dxf file into SHAPE-THIN. What is the issue?
- How can I display membrane stresses in the results of RF‑STEEL Surfaces?
Programs Used for Structural Analysis
The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions
Stress analysis of steel members
Stability analysis according to the eigenvalue method