Boathouse ZHSGroup K | Andreas Fehrenbach - Sebastian Schrönghamer

Chair of Computational Modeling and SimulationChair of Energy Efficient and Sustainable Design and BuildingChair of Architectural Informatics

Boathouse ZHS

Chair of Computational Modeling and Simulation | Prof. Dr.-Ing. André BorrmannChair of Energy Efficient and Sustainable Design and Building | Prof. Dr.-Ing. Werner LangChair of Architectural Informatics | Prof. Dr.-Ing. Frank Petzold

Assistants: Katrin Jahr, Benedict Rechenberg

Students:Andreas Fehrenbach Sebastian Schrönghamer

Table of Contents

1 Topic2 Architectural Concept3 Architectural Design4 Process Management Map5 Structural Engineering Calculation6 Bill of Quantities7 Results on Collaboration, Procedure, Problems8 Project Progress

The ZHS Munich is the student sport facility of all universities in Munich. Students are able to conduct a large variety of sports. Part of it are the different boat sport types e.g. sailing. Since there are little to no pssibilities for sailing within the city of Munich the ZHS outsourced this de-partment to the close lake of Starnberg. There nearly perfect conditions are given. The lake of Starnberg itself and steady moderate winds are used to excercise and enjoy the nature as well as the view of the close Alps. The ZHS Mu-nich established in this area its facilities for boat sports which include the sailing center, a class

room, a kiosk and several toiletes and locker rooms. Since the interest, with that the number of participating athletes, increased and in Sum-mer 2018 the TUM Craft Race takes place at Lake Starnberg the persons responsible „want to construct a new boathouse with workshoparea to provide space for the students to de-sign and test their prototypes.“ It is required to use the so called Building Information Modeling (BIM) and its necessary software for the design, structure, quantity takeoff and scheduling.

1 Topic

1.1 Introduction

1.2 Site plan ZHS WatersportsUnterer Seeweg 582319 Starnberg

1 Topic

At the beginning we decided to go to the site, take a look and photos of it and conduct a survey the daily users and empolyees what they would like. That query resulted among others in more control over who enters when the facility, so for us was clear they need a more practicable design. We decided to focus on functionality, sustainability and given conditions. Our concept is built out of wood which is sustainable, the local resource and most used material. Furthermore we wanted to avoid the hot summer heat as well as the sunlight from the south. Therefore we kept the southern roof closed and opened the northern part with a lot of windows. Another point was the main wind direction, because it is from the west we built this side of the building as a long protecting wall. The structural and all other appearing issues were added and changed step by step, especially when we developed our project in BIM software.Additionally there were also official requirements:• 6 parking spaces for boats of the type

470 „Jolle“• maximum 200sqm workshop area,

clearance height 10m• the parking spaces should be sheltered

2 Architectural Concept

3 Architectural Design

Our layouts and elevations show the functionality and adaptions to environmental issues. The walls in the west and south are longer than the building to shelter the users as well as in the north the boats. The groundfloor consists of a repair shop, work shop, coating room and office. The earlier mentioned controlling function is fullfilled by the location and arrangement of the office and coating room. In the first floor we only have one

closed room for the workers as a break room. Above the coating and the office is a long free space which can be used as storage. The roof is a mixture of a monopitch and a gabled roof which is shaped like canvas in the east.Below the northern part of the roof the boats can be parked. To fullfil the required 6 lots boats on the wall side have to be piled.Following the plans and elevations of our boatshouse:

3 Architectural Design

Ground floor

3 Architectural Design

First floor

3 Architectural Design

Elevation North

Elevation South

3 Architectural Design

Elevation West

Elevation East

Our Process management map according to „Business Process Model and Notation“(BPMN) can be seen in the following. In line with the de-mands and the usual procedure we created the two basic stakeholders client and design team, consisting of architecture, engineering and

quantity take-off, and the basic framework in the beginning to have a schedule. Every now and then as an iterative process for decision making and time scheduling and since our Architect left the group we had to adjust the tasks to project the occured problems and difficulties.

4 Process Management Map

First task was to collect all the information gi-ven about the location including wind and snow loads. They are available online and in the so called „Schneider Bautabellen“. Since we are in the south part of Bavaria the required zones are:• Snow: Zone 2• Wind: Zone 2Main wind direction is from the west.Our first rudimentary structural system (as you can see in the picture) consisted of a central cantilever as a column and developed to the left and right several pillars connected via sing-le-span beams. Only the pillars and beams are bearing, the walls will be built in timber frame construction. Since the load in the middle of the southern roof is very high we changed the nor-mal beams into trusses. Then we checked the northern part of the roof and decided to do the same. The whole system should be built in tim-ber material but if it is necessary or more practa-ble it should be changed.

5 Structural Engineering Calculation

5.1 Introduction

After we had confirmed our preliminary and sketched statical system we had to transform it into a digital one in Revit. This means you need to create a node model. All necessary items of the building need to be connected in a right way

which theoretically occured easier than practi-cally was. One problem was to not change only the physical structures in the digital model but also the nodes.

5 Structural Engineering Calculation

5.2 Node model

For the structural analysis load assumptions had to be determined. The used loadings are dead load, live load, wind load and snow load. All cal-culations were made by hand and together with the analysis accomplished by the software So-fistik. Dead loads are calculated automatically in the program. Since the load distribution area function of sofistik did not apply our loads to the beams, trusses and pillars we had to convert our

area loads into line loads manually which meant they needed to be calculated first. All vertical loads are carried to the ground by the pillars, the horizontal wind load from the west was calcula-ted according to given schemes. For the snow loads the global coordinates sys-tem is used, for the wind loads the local.Following schemes, assumptions and calculati-ons:

5 Structural Engineering Calculation

5.3 Load assumptions

5 Structural Engineering Calculation

5.3 Load assumptions

Live loads:

According to German Norm we assumed live loads as 5,0 kN/m² for storage rooms.

Wind loads (we considered our roof as duopitch roof):

Roof WallsNorth

South

West East

Calculations:

Roof north south

Walls west east south

5 Structural Engineering Calculation

5.3 Load assumptions

As we mentioned earlier we had to convert our area loads into line loads. In the following tables you can see the calculations. First the roof which we had to divide according to standards in several zones (column 1). Then we took the

given area load and multiplied it with bearing meters of the trusses and beams. To check if it is suitable we multiplied it again with length of the bearing systems. The same goes with the walls.

Pos. m kN/m kN Pos. m kN/m kN

Pos. m kN/m² kN/mPos. m kN/m² kN/m Pos. m kN/m² kN/m

Snow loads (we considered our roof as duopitch roof):

Calculations

Roof north south

5 Structural Engineering Calculation

5.3 Load assumptions

The same with the snow load.

Pos. kN/m m kNkN/m m m kN

Snow load Wind load

Analysis Sofistik:

After connecting all nodes and adding all loads correctly the model was exported to Sofistik and

afterwards analyzed. As you can see in the pictures the snow has a heavy impact on our beams whereas wind is not that decisive but beneficial.

5 Structural Engineering Calculation

5.3 Load assumptions

My N

Displacement of nodes

5 Structural Engineering Calculation

5.3 Load assumptions

To know the masses and equipment of the pro-ject we ussed the software iTWO for the bill of

quantities. Following our first excerpt from the 13.12.2017:

6 Bill of Quantities

After changing and adapting the project logically the masses also changed. Our final bill of quan-

tity from the 08.02.2018:

6 Bill of Quantities

Druckdatum: 08.02.2018 Seite: 1 von 1

Ausstattungsdefinition Projekt: 20180208 LV ZHS Boathouse Group K

1.10 Aushub 276,199 m³

2.10.10.10 Beton inkl. Bewehrung 276,199 m³

3.10 Holzwand Typ Holzrahmenbau 402,366 m²

4.10 Geschossdecke Holz 138,937 m²

5.10 Dachfläche Süd 288,049 m² 5.20 Dachfläche Nord 281,824 m²

6.10.10 Fenster 1-flüglig 12,000 St. 6.10.20 Fenster 2-flüglig (b=2,0m) 8,000 St. 6.10.30 Fenster 2-flüglig (b=3,0m) 5,000 St. 6.10.40 Dachfenster 5,000 St.

6.20.10 Türen Drehflügel 1-flüglig 4,000 St. 6.20.20 Türen Drehflügel 2-flüglig 1,000 St. 6.20.30 Tore 1,000 St.

7.10 Treppen 1,000 St.

8.10 Stützen (l=3,0m) 6,000 St. 8.20 Stützen (l=3,7m) 5,000 St. 8.30 Stützen (l=4,3m) 3,000 St. 8.40 Stützen (l=4,5m) 1,000 St. 8.50 Stützen (l=5,3m) 6,000 St. 8.60 Stützen (l=5,5m) 3,000 St. 8.70 Stützen (l=6,7m) 2,000 St. 8.80 Stützen (l=7,9m) 6,000 St.

9.10 Pfetten und Sparren (100x200) 103,000 St. 9.20 Pfetten und Sparren (60x140) 3,000 St.

10.10 Ober- und Untergurt 14,000 St. 10.20 Stege 119,000 St.

Schlüssel Bezeichnung Menge ME

1 Erdarbeiten

2 Stahlbetonarbeiten

2.10 Gründung

2.10.10 Bodenplatte

3 Wände

4 Decken

5 Dach

6 Fenster und Türen

6.10 Fenster

6.20 Türen

7 Treppen

8 Stützen

9 Pfetten und Sparren

10 Fachwerkbinder

At the beginning the collaboration was very good, everyone within the project fulfilled its tasks and the result was a clear concept presentation. In the mid part of the project we had several pro-blems (one member left, job duties) which were agreed in advance. Since the job duties were gone the remaining group worked as much as possible together to finish the project. As time

passed it was recognizable that the tasks and the workload for only two group members was quite a lot which meant we struggled a lot and tried to keep in time but in the final presentation it was conspicuously that the other groups had more manpower and could distribute more tasks and also work on architectural issues which we were not able to adress.

7 Results on Collaboration, Procedure, Problems

7.1 Collaboration

Software:

Several problems occured during the whole project with data exchange of the different soft-wares Revit, iTWO and Sofistik. Some of them could be solved, others remained and we either had to find solutions like exchange something or left them as they were since there was not enough time or too much workload.

Revit - Sofistik:• no area load on roof applicable, needed to

be converted into line loads• errors and warnings in Sofistik only with ele-

ment numbers and not really traceable• only two cross sections for timber structure

in Sofistik• contains no timber standards• no installation of extension for timber struc-

ture in CIP-Pool possible

Revit - iTWO:• cut out every wall – no connection between

columns and walls allowed• modeling of panorama windows as in Revit-

Tutorial not possible• no template for wood structures for bill of

quantities

General:

There were not only software problems but also we had to handle different general issues which probably also occur in real life so we have to ad-mit this was a good experience to learn from.• not really using the advantages of BIM soft-

ware like working at the same time on diffe-rent computers

• after our group was reduced we focused too much on architectural and design part

• time and schedule problems• communication and task problems

7 Results on Collaboration, Procedure, Problems

7.2 Problems

The first model was just a crafted sketch from our former Architect on which we worked to-gether and tried to bring in our ideas, as well as structural and energetic issues. The next step was to transfer this anologue draft into a digi-tal one in Revit. Here several problems e.g. the structure appeared and we had to change the original concept step by step. 1. A big subject was the skylight. Our origi-

nal windows were too small so we had to change the size. Therefore it was necessa-ry to change the whole roof, the walls in the

first floor were removed and we changed to bigger windows.

2. Another issue were the beams supporting the roof. Since our first predictions were too small we had to change them to trusses.

3. The facade we constructed at the beginning had a problem with connectivity of walls and columns which means that although all should be aligned you still could see the dif-ferent types.

4. The roof on the east got a sail shape

8 Project Progress

Following the different stages of our model:

1. Analogue model for the concept presentation

2. Digital model for the interim presentation

8 Project Progress

3. Digital model for the final presentation

8 Project Progress

3. Digital model for the final presentation

8 Project Progress

Impressum

Andreas Fehrenbach Sebastian Schrönghamer