Cat On A Hot Tin Roof Analysis Act 1

[Jeremias Resendez]

Iam trying and failing to generate a shadow study within an office layout that shows the solar gain from the perimeter glazing. I have taken the section plane to 1000mm from Level 01 FFl and now the light comes in from the top (Although the roof layer is switched on and the roof is visible when the section plane is not active.)

Does this still work ?

in older version of SU i successfully got transparent .png file onto face and hid edges, this cast a shadow. Now when i try it transparent .PNG appears orange.

Any changes to way materials work between SU 8 and 2018 ?

still have problems with this one, Im still getting a transparent orange look no matter what colour i pick , with tranparent .png texture enabled.

anyone want to share transparent .png with me? (photoshop sometimes is telling me it cannot save image due to image being empty ) cheers

Here I just made a square in photoshop ( uncheck lock button) and made asmall pixel line selection and filled it with black, inverted and deleted everything else so its all transparent except for line. Save as a png.

Yes it could be 100% transparent, I think the idea of having some solid entity in there was to make it obvious/tangible that which was transparent, but you are right in that it could be a blank .png image (non-image).

Hi,

I ran the Heating and Cooling Loads Calculation on my project and noticed that in the report my calculated roof area is 0

and for that same reason im not gaining any heat from it which seems odd to me, I checked the analitycal surefaces and

instead of a roof i have air gaps is there anyway to fix this?

Attached some screenshots

I'd appreciate any insight you can provide.

Hello, dear, open a section view of the last floor, make all space subcategories visible and make sure, that the upper side of your space is higher, than your roof. Revit will recognize roof boundary automatically.

Excuse me I have the same issue but I couldn't understand your answer completely, I created the view but dont see what to do next. I know it is an old post I hope you can still answer me. I am working with Revit 2019.

Hello, this can be done:

1) manually:

create a space-schedule.

Add to this schedule parameters such as "Space name", "Level" (this helps you to identify the desired space) and "Upper limit". Now you have a table with all model spaces and "Upper limit" will be in a separate column. Also, you can group all spaces by level - for example, you will have one row for all spaces located on the last level (if you have only solid flat roof).

2) using Dynamo:

collect all spaces, filter needed, change "Upper limit" parameter. Not sure, that you can open different Revit-files via Dynamo to make changes in different models and save these changes.

3) using Revit-API:

I guess, in this case, you need a programmer, sorry. Here you will have an add-in, which opens revit-files, changes spaces, saves...

It is working well automatically. So now the pipeline is I open a Revit file, I put spaces automatically with the button, then spaces are changed automatically with Dynamo, then I do the heating and cooling report with the button.

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In this article, we will explore the definition, function, and various types of roof rafters, including their unique features and applications. We will also discuss different materials used for rafters, such as wood, steel, and cold-formed steel, along with practical tips for rafter design and analysis.

In any structural design project, the importance of roof rafters cannot be overstated. Rafters play a crucial role in supporting the roof, distributing its weight evenly, and ensuring the overall stability and integrity of the structure. They are essential components that provide strength and support to the roof system.

The primary function of rafters is to transfer the weight of the roof to the walls or other load-bearing elements of the structure. By distributing the load evenly, rafters ensure that the structure remains stable and can withstand various external forces, such as wind and snow loads.

Common rafters are the main load-bearing members in a roof system. They extend from the ridge to the wall plate and are typically evenly spaced along the roof's length. Common rafters form the basic framework upon which other types of rafters are installed.

Hip rafters are diagonal members that connect the corners of a roof to the ridge. They provide support and stability to the roof's hips (external angles formed by the intersection of two roof surfaces). Hip rafters are commonly used in hipped roofs and are essential for distributing the load from the roof to the walls.

Valley rafters are inclined members that run along the internal angles formed by the intersection of two roof surfaces. They join the ridge to the eaves and help support the weight of the roof in these critical areas.

Portal frame rafters are structural members within a portal frame system. It serves as the primary load-bearing element that spans between columns, providing support to the roof as well as lateral stability. They are crucial components in constructing portal frame buildings, which are widely used in commercial, industrial, and agricultural applications.

They are commonly made of dimensional lumber or engineered wood products. Wood rafters are suitable for most residential and light commercial applications and are often preferred for their aesthetic appeal.

They are lightweight yet strong, making them suitable for both residential and light commercial projects. Cold-formed steel rafters are particularly advantageous when longer spans or unique roof designs are necessary.

The two most common types of residential roof frames using rafters are the ridge beam system and the collar tie system. The former refers to inclined rafters extending from a ridge beam to the wall plates. The latter consists of inclined rafters extending from a ridge board to the wall plates and tied together by a collar tie beam.

A ridge beam is a structural element that performs a load-bearing function in addition to its role as a connecting point for the upper ends of the rafters. Unlike a ridge board, a ridge beam is designed to support the weight of the roof and transfer it to the supporting walls and columns.

The process of assessing and evaluating the behavior and performance of a structure under various loads and conditions starts with a simple free-body diagram. Figure 5 shows the ridge beam represented by a pinned support and the walls or beams represented by roller support.

Determine the different loads that the rafter will be subjected to, including dead loads (weight of the roof materials), live loads, snow loads, and any other applicable loads, such as wind loads. Consult the local building codes or relevant standards to obtain the design loads specific to your location.

Combine the different loads using appropriate load combinations specified in the building codes or standards. Load combinations consider various load scenarios to ensure that the rafter is designed to withstand the most critical conditions.

Perform a structural analysis of the rafter to determine the internal forces and moments it will experience under the applied loads. This analysis involves calculating the bending moments, shear forces, and axial forces along the length of the rafter. Consider the span, roof slope, and any additional design constraints.

Evaluate the deflection limits for the rafter to ensure it meets the required serviceability criteria. Calculate the deflections considering both immediate and long-term effects, including creep and shrinkage of wood. If necessary, modify the rafter size or incorporate additional supports to limit deflections.

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