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A guide to modeling a Concrete Structure in SkyCiv Structural 3D Analysis and Design software


In this article we will demonstrate a step-by-step guide of how to model concrete structure, ノードなどのトピックをカバー, 会員, プレート, プレートと材料のメッシュ. Since we have a large number of users designing concrete structures, we thought it might be a good idea to go through a start-to-finish example of how to model a simple concrete frame, with a few slabs and a cantilever balcony. We will mainly cover the modeling aspects and not so much the actual design. The above sample structure is built is SkyCiv構造3Danalysis and design software that is fully accessed through your web browser.

サンプルモデル: concrete-structure-sample-docs.s3d

model a concrete building

Watch the Tutorial Video:

ステップ 1: Define the nodes and members

How you define your nodes is usually based on preference. Some users swear by the 他のいくつかの例は (またはノードを Excel から直接コピーする), whereas some users, 私のような, prefer to use the inbuilt modelling functions of the software. この場合, I will define my nodes and members using the ペンツール and a few of the right click functions. 覚えて: you don’t have to use the pen tool here, you can simply enter the nodes of the structure through the left field and join them by click and dragging using the crosshair.

Use the pen tool to outline the general shape of the structure:

Start by modelling the outline of the structure. We’re going to build a simple 8 バツ 5.5 x 20m. As this structure doesn’t have any complex members, it would be easy to use the pen tool to model out the structure:

model a concrete building

You can also use the pen tool to snap from a midpoint, so you don’t need to manually calculate these positions. This is useful when building our cantilever:

model a concrete building

Assign different sections:

Since we’re going to have 3 セクション: (1) concrete columns, (2) cross beams and (3) outer beams, we should start defining the different section IDs. The way I like to do this, is using the CTRL + Click drag function (drag to the right to highlight anything in contact with the selection box). これをする, I will turn my crosshair back on (つまり. turn off the pen tool), then select the sections I want to change, then click members to multi-edit a batch of elements:

model a concrete building

Add multiple beams:

今、追加したい 10 ビーム, spaced 2m apart along the top beams. これを手動でモデル化できます, but a faster way would be to use the duplicate functionality to copy across a single beam – これははるかに高速です. 複製にはすべての属性が含まれます (セクション ID, オフセットなど…). Here are the steps of how to use this operation. Start by using inclusive selecting (NS + 左にドラッグ) 複製したいモデルの部分を分離するには. これにより、ボックス内にあるもののみが選択されます, 複製したいメンバーとノードを簡単に分離できるようにする:

model a concrete building

model a concrete building

強調表示された要素を右クリックした後, and selecting the duplicate オプション, 次のポップアップが表示されます. Here you will enter the direction and number of repetitions to add:

model a concrete building

model a concrete building


To add supports, 別のショートカットを使用しますが、Ctrl キーを押しながらマウスをクリックしてドラッグし、包括的選択ボックスを実装します。. ここから、ノード ID ボックスをクリックするだけで、選択したすべてのノードを含めることができます。:

model a concrete building

ステップ 2: Assign Sections and Material Data

We now want to define the sections and their materials. We need to define what their cross sections are so that the software can understand the material strength and geometric properties of our beams and columns. This is required information for the software to calculate results such as deflection and stresses as they define what the member’s E (ヤング率) そして私 (慣性モーメント) among other sectional properties. この場合, we will apply 3 sections to represent the three sections we defined in our previous step.

Our beams will be a custom shape, so that we can add and design the reinforcement of these sections in the SkyCiv 一般セクションデザイナー.

model a concrete building

We will also add a concrete column by adding a circular shape of 600mm and changing the default material from Structural Steel to Concrete. We can add a custom material by clicking the ‘+’ SkyCiv素材データベースに署名して開く. In our example we are just going to use the standard concrete material provided by default, but you can change these properties at anytime under 材料 in the main UI.

model a concrete building

ステップ 3: Add Plates (コンクリートスラブ)

We can add plates a number of different ways. 以来 SkyCiv Plates are not limited by the number of nodes, we could enter the entire plate in one go, then use the Quadrilateral Meshing feature to automatically mesh the entire plate. This is helpful if you have curved or irregular plates. 私たちの場合には, the structure is fairly regular so we can build three rectangular plates like so:

model a concrete building

We then hold CTRL and multi select all three plates, so we can mesh them all at once. This is really important as it tells the software we want the plates to be connected by common nodes.

model a concrete building

model a concrete building

Inspecting our Mesh:

Inspecting our Mesh we can see a few important things:

  1. There are nodes along the members. Since the members are 継続的 so they will automatically pick up and connect to any intermediate nodes. This ensures our plate is connected to the members correctly.
  2. The plates are joined by common nodes

model a concrete building

注意: Even though there some inconsistencies in the mesh (the 3rd plate mesh, is inconsistent with the first two), this is a first iteration of the design, we only really need to see if the strength of the members is met. We can improve on this later by re-meshing our plates (right click – メッシュ), to make the mesh more consistent across the third plate.

Edit materials, thickness and offset of our plates:

個人的に, I like to use the 3dレンダラー to review and edit certain parts of the model. It helps me ensure the model dimensions are built correctly (for instance a really thin section will be very obvious). Take our plates for instance; after opening the 3D Renderer I realised I forgot to adjust the thickness of the plate from the default value:

model a concrete building

ここから, I assigned the 3 plates with a 200mm thickness, changed the material to コンクリート and also offset the plate by -140mm (this will shift up the plate as the local axis of the plate is Z down):

model a concrete building

We can also see this by turning on Wireframe mode and selecting the elements that you’re looking to edit (in this case I CTRL + clicked the internal plate and the two outer beam members):

model a concrete building

There you have it, you can then assign some loads or apply a self weight and hit 解決する to run your analysis.

Further Concrete Design and Analysis:

RC Beam and Column Design

To further the design of this structure, users can design the columns and beams as per ACI 318, なので 3600, CSA A23 そして ユーロコード 2 for Reinforced Concrete Design. Click here to learn more about how to get started designing your concrete beams and columns in Structural 3D.


The foundations of this building can also be designed as per ACI 318, なので 3600 concrete design standards with SkyCiv’s built-in 基礎設計ソフトウェア.


Custom beams and column shapes can be designed using the SkyCiv General Designer. Input your loads from the above analysis into the GSD to get the moment capacity and utility ratios of any custom members you might be designing:


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