## Gridshell: Form Finding

GRIDSHELL STUDY: F² GRID ITERATIONS

When considering the behavior of our gridshell structure we focused on specific variables: anchors, spacing, and height. Through the use of Rhino and supplemented by Grasshopper we were able to visualize the effects of number of anchors, changes in spacing, and changes in height and their effects on the structure’s behavior.

GRIDSHELL STUDY: F² GRID ITERATION #1

In iteration #1 we used a 30’ x 30’ grid that is unevenly spaced. We experimented with 2 anchor points. In the 3D model you can see the form it creates is an open ended structure from two sides.

GRIDSHELL STUDY: F² GRID ITERATION #2

In iteration #2 we used a 30’ x 30’ grid that is unevenly spaced. Although the process of the spacing is unlike the previous grid because the spacing of the lines remain closer together where the 2 anchor points happen and wider as it moves to the corner where there is an absent anchor point.

GRIDSHELL STUDY: F² GRID ITERATION #3

In iteration #3 we used a 30’ x 30’ grid that is evenly spaced creating a rectangular shape rather than the traditional square grid. We experimented with 4 anchor points. In the 3D model you can see the form it creates is an open ended structure from two sides.

GRIDSHELL STUDY: F² PROPOSED GRID

From our iterations, we chose to pursue a gridshell that was constructed using an irregular pattern and three anchor points on a 30’ X 30’ grid. From the iterations we admired this pattern overall.

GRIDSHELL STUDY: F² PROPOSED GRID/DIGITAL MODELS

GRIDSHELL STUDY: F² PROPOSED GRID/VIDEO EXPLORATION

You can see a video of how the structure was formed here.

http://www.screencast.com/t/y1CN9wzjp0

GRIDSHELL STUDY: F² FINAL MODEL

GRIDSHELL STUDY: GRIDSHELL CONNECTIONS

In order to understand the actual behavior of a gridshell built to exact dimensions, we first needed to construct a study model. The study model provides a wealth of information. From the model, we can detect areas working well and poorly under tension and compression. Because our model is at a smaller scale we used 1/8” rivets. By studying this model and the rivet connections we are able to monitor its behavior. Therefore, we can research connection methods that will perform at an optimal level for the build.

PNEUS:  WEEK #1

During the early phase of our exploration we studied pneumatic structures. We began by studying basic geometric shapes: circle, square, rectangle, diamond, pentagon, hexagon, rhombus, and triangle.

PNEUS: WEEK #2

During our Week #1 Exploration, we focused on the recreation of pneumatic structures based on basic geometric shapes. From these studies we explored the circle. From the circle, we explored the construction of a dome, a torus, and later an articulated ribbed torus as shown below. Plastic panels define the framework for the structure. Durable frameworks ensure that the piece is structurally sound.

PNEUS: PNUEMATIC STRUCTURE

We sought to construct an amorphic shape that was both aesthetically pleasing, an enjoyable space to experience, large enough for a group of people and freestanding? We explored stitching patterns. After testing our pneumatic inflatable, we conclude that stitching is crucial for the pneumatic structure to remain upright.  We learned from these studies that tight seams are important for a structure that is free from cavities and depressions. These seam studies became our foundation for understanding gridshell structures and areas that were prone to sagging.  After this build, we wanted to research changes in texture, color, and size and their effects on experience. Our amorphic structure held very well under pressure. It was enjoyable to those who partook in this social experiment. People really enjoyed crawling inside the inflatable and frolicking inside away from the outside world.

GRIDSHELL STUDY: SKIN EXPLORATIONS

We explored different skins and techniques: inflatables, weaving, canvas panels, and metal panels.

GRIDSHELL STUDY: CANVAS INSTALLATIONS

Canvas is a material that we chose to use for our skin exploration on our final model. We studied other skins and their advantages and disadvantages. We chose to use canvas because it has a fine finish. It can create alluring designs. It comes in many colors and it’s durable and weather resistant.

GRIDSHELL STUDY: PROJECT ESTIMATES

We collected quotes for the material from hardware stores in San Antonio. We were inclined to use White Pine because it has fewer knots. It has clean cuts and it is durable lumber. Canvas ranges in price based off of the grade. Higher millimeters within the grade are more expensive but, the advantage of  higher grades is that they have a better water resistance.

White Pine (MG Quote)

\$5.36 (1×4-12’) x 108 (4 Layers) = \$2,315.52

Outdoor Canvas

20’x 30’= \$500- \$900