Meeting 4/29/2015

Mark Odorizzi, Daniel Synoski, John Vargo                                                                                    

4/29/2015

Group 42 Section 940

Week 5, Meeting 10

Objectives
Present plan, elevation, and section

Determine the schedule for the next five weeks

Begin applying structural theory to the shelter

Procedure

The meeting started with greetings a confirmation of the what we did sheet, and other general administrational proceedings. We told Dr. Mitchell that we will no longer be creating a 3D model of the shelter and will not be doing an environmental report separate from the final report.

Dr. Mitchell had a few suggestions for the drawings. For the section, Dr. Mitchell suggested that the interior rear facing benches be taken out and said that in true section, the piers need to extend into the ground and have footing to spread the compressive force into the soil. This needs to be drawn in the section. In plan, Dr. Mitchell told the group to fillet the sidewalk corners to open the space up and to add another bench on the exterior on the side of the walkway. The discussion also included the debate between multiple paths and only one. The decision made was that one path would provide the most open and practical benefits to the original purpose of choosing the garden site; getting bus patrons off of the sidewalk.

The next portion of the meeting was determining what the group should see at the end of the next five weeks. Dr. Mitchell gave the group a list of things to think about. For materials, think about the following criteria: strength, aesthetics, lifespan, and cost (operation and initial). There are electrical requirements that are outside the scope of the project, but the costs of digging and operating are important. The stormwater needs to go somewhere. There are two options, direct the water to the PISB cistern and create our own cistern. Both have costs and design constraints of their own. Below the surface there is at least eight feet of urban fill with a compressive strength of 1000 lb/sf. This is what our footing will be resting on.

The rest of the meeting was about the beginnings of structural analysis. There are two types of loads that will cause problems; dead and transient loads. Dead loads are simple loads due to the structure itself. Transient loads include gravity loads of snow and horizontal loads of wind. For these it is best to calculate for the worst possible scenario. None of the calculations will be done solving for buckling. This means we will add a safety factor that wouldn’t otherwise be necessary. The first step to structural analysis is identifying loads. The structure has a roof weight, vertical snow loads and lateral wind loads.

Obstacles

The meeting ran smoothly, there are no obstacles to report

Progress Against Schedule

The structural design is not finished because of the issues of water management and subsurface design. This unforeseen topic will be accounted for in future proceedings. The CAD drawings must also be updated in the future. The group is not behind, however, in the wholistic schedule.

Goals for Next Meeting

Calculate the gravity loads and lateral loads on all sides

Begin final report draft

Continue studies on structural analysis.

Meeting 4/22/2015

Mark Odorizzi, Daniel Synoski, John Vargo                                                                                    

4/22/2015

Group 42 Section 940

Week 4, Meeting 8

Objectives
Check constraints list with Dr. Mitchell

Discuss future steps in design

Learn more about load bearing calculations

Procedure

The meeting began with basic administrative proceedings including greetings and the what we did checklist. Dr. Mitchell made a correction to the units of the load making them 25 lb/sq instead of just 25 lb.

The next step was to go through the design ideas that the group put together in the previous meeting. First we discussed the doodles of potential floor plans and path designs as discussed last meeting. Dr. Mitchell suggest that the group consider more regarding the roof design. There needs to be a gutter and a splash block to avoid soil erosion from the gutter. Another thing to think about is lighting and structure material. How does the light get into the shelter? What is the roof made of? Is it the same material as the walls? Finally, on the design topic, Dr. Mitchell raised the question of subsurface structure. The piers need to extend into the ground and have a footing to spread the compression force into the soil (soil has a compressive strength of 1000 lb/sf) and the wind loads have to hit a supported beam.

This brought the discussion to a strength of materials lecture. Dr. Mitchell provided the equation σs  = M / I where σs is the maximum stress of a material, M is the moment, and I is the moment of inertia  of the shape. The purpose of the lecture was to get a basic understanding of the theory and expand on it outside of this meeting.

Obstacles

There are more components to the structural analysis than the group had anticipated and the design does not solve for all of the problems originally stated (i.e. rain gutter, water management, etc…). The group foresees struggles regarding calculations.

Progress Against Schedule

The group is on target in terms of the projected schedule. The structural analysis and design may take a few more weeks than scheduled due to inappropriate knowledge of the difficulties.

Goals for Next Meeting

Update design

Continue research on structural analysis