Interrelation of Geometry, Daylighting andStructure in Perforated Screen Walls

Niloufar EMAMI, Peter VON BUELOW

University of Michigan2000 Bonisteel Blv, Ann Arbor, MI

nemami@umich.edu

Outline• 1- Introduction

• 2- Persian Patterns

• 3- Shading Screens

• 4- Configuration processing

• 5- Daylighting performance

• 6- Structural performance

• 7- ParaGen

1- Introduction

Architecture

Daylightingperformance

Structuralperformance

Quantitative Assessment Qualitative Assessment

Visual aspects

Design Aesthetics

•Objective of this study

•Goal of this research

•Methods

2- Persian Patterns

Jamé Mosque of Yazd Jamé Mosque of Isfahan, Ostad Ivan

Family of geometric patterns

Family of geometric patterns Grids as the invisible structure of patterns

3- Shading screens

The shading screens, “Shobāk”, in Jame Moque ofIsfahan

Shanāsheel, TaheriHouse, Bushehr, Iran

Shanāsheel ,Deyri House, Bushehr,Iran

A house in Basreh, Iraq

Case study: Masdar City

Case Study: Al Bahr Towers

4- Configuration Processing

Configuration Processing

Geometric parameters

Parameter Symbol Constant/variable

Acceptable interval

Width of the screen W Constant 500 cm

Height of the screen H Constant 500 cm

Depth of the screen D Variable [5-35 centimeter] step5cm

Hexagonal grid radius Grid Constant 35

Diamond diagonal dimensions Diamond Constant 35 * 61

Division Distance (the distance fromattraction point is divided by thisvalue)

Div. Dist. Variable [1-110] step 1

Radius of the wall’s curvature R Constant 4819 cm

Center location of the subtractedcurve

Center Variable in y axisVariable in z axis

[0- 36] step 1[0- 500] step 1

Architectural Applications

Phase 1 of study: Design of Experiments

5- Daylighting Performance

Location Date Time Materials Sky-types Settingparameters

Phoenix,AZ

September21st 2014(used for point intime visualization)

solar noon(12:21 pm)

Generic Floor (20)Generic interior walls (50)High reflectance ceiling (90)Outside ground (20)Glazing single pane (88)Outside Facade (35)

Clear sky withsun

ab 2,ad 1000,as 20, ar 300

Diva for RhinoSettings

Section of the office space

Daylighting Results

Daylighting Results

6- Structural Performance

Structural Results

7- Phase 2 of study: ParaGen

A selection of randomly generated solutions used to initiate the search

PARAGENForm Generation

Evaluation

SQL storage and website

Geometry (3dm)

Writes the datafromgrasshopper toexcel file

Generates valuesSystematically, randomly, or bybreeding

New parameters for geometry

Reads the data from excel andcontrols parameters ingrasshopper

Performance valuesUploaddata

Parallel point diagram of the parameters andthe performance values

A display of solutions taken from SQL database

Available performance values of each case

Mean Daylight Autonomy versus perforation ratio

Mean Daylight Autonomy versus Weight

Conclusion• The study contributes to the design of screen walls, in order to control

daylighting and to provide shading for the buildings.• multi-objective performance evaluation of a screen wall, inspired by

Persian geometric patterns.• The perforation ratio of each module can differ to accommodate the

unique daylighting needs of a specific space.• The depth and curvature of the wall can vary depending on the

required structural behavior, which ultimately affects the weight of thewall

• The modules of the screen wall can be stacked on top of each other toshield a multi-story building, which expands the boundaries of itsapplication.

• Designers can bring variety to the design of screen walls, not only withvarying geometrical perforations, but also with altering the curvature

Thanks for your attention!