You can neglect openings with a certain area in the building model calculation. This function can be activated in the global settings of the building stories. A warning message appears saying that the openings have been neglected.
![KB 001885 | Assessment of Story Drift under Seismic Loads According to ASCE 7-22 and the Building Model](/en/webimage/051645/3995306/im1.png?mw=512&hash=b8237709c4f30213fac51d86d32a42bddde72f03)
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![Building Model Add-on](/en/webimage/028467/3231624/1_en.png?mw=512&hash=fd421b3f2c85d04e163841c3e5995f948391dd20)
![Building Model Add-on](/en/webimage/025224/3154703/25224.png?mw=512&hash=f09d0c9ec35b2fb8547a76f0261b3b14941fdba3)
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When modeling floors, the "Semi-rigid diaphragm" option is available for slabs.
In principle, this modeling option selects the same approach as for the "Rigid Diaphragm" floor modeling. In contrast to the rigid diaphragm, no nodal coupling is carried out from the center of gravity to each FE node. In this way, the flexibility of the ceiling can be taken into account.
![Feature 002825 | Shear Walls and Deep Beams Consisting of Members](/en/webimage/050709/3925056/50709.png?mw=512&hash=8e57b70946dcc367584aee1ee2d82b3efafa652f)
When generating shear walls and deep beams, you can assign not only surfaces and cells, but also members.
![Feature 002818 | Neglecting Openings](/en/webimage/050330/3880440/1.png?mw=512&hash=9d7f6c198b6d4ae6ee8f2fa8bca75f85579e14c9)
You can neglect openings with a certain area in the building model calculation. This function can be activated in the global settings of the building stories. A warning message appears saying that the openings have been neglected.
![Feature 002632 | Floor Analysis as Detached 2D Structures](/en/webimage/041070/3545124/2023-06-22_15-36-36.png?mw=512&hash=1e094ee30f4d2d0a9c93f2cd5f456c9ba5c2afe0)
The building model is calculated in two phases:
- Global 3D calculation of the global model, where the slabs are modeled as a rigid plane (diaphragm) or as a bending plate
- Local 2D calculation of the individual floors
After the calculation, the results of the columns and walls from the 3D calculation and the results of the slabs from the 2D calculation are combined in a single model. This means that there is no need to switch between the 3D model and the individual 2D models of the slabs. The user only works with one model, saves valuable time, and avoids possible errors in the manual data exchange between the 3D model and the individual 2D ceiling models.
The vertical surfaces in the model can be divided into shear walls and opening lintels. The program automatically generates internal result members from these wall objects, so they can be designed as members according to any standard in the Concrete Design add-on.