Definition and application of notional loads (Notional Loads) in ITBS
As mentioned in paragraph 10-2-7-1-5, it is necessary to apply 0.002 coefficient gravity loads for the anchor reinforcement method at the level of each floor in order to allow implementation errors. These loads are applied in the two main directions of the structure separately and only in the combination of gravity loads and in the absence of side loads. But how to define and apply this burden? For this purpose, before analyzing the structure, we must define these loads by referring to the Define/Static Load Case section. In this case, the following points can be mentioned:
1- Imaginary loads must be defined as Notional.
2- Notional type load mode should be defined twice as many gravity load modes. That is, for each gravity load mode, two Notional load modes must be defined. One of these two modes is for the lateral load in the main X direction and the other is for applying the lateral load in the Y direction. For example, if we have two dead load states and one live load state as a gravity load, we must define 6 Notional load states with different and arbitrary names.
3- There are two ways to apply notional load to the structure. The first method is to manually apply loads to the structure. In this case, when defining the load in the fourth column under the name Auto Lateral Load, select and apply the None option. After defining the load mode, the amount of Notional loads must be calculated during loading, like other loads, with manual calculations and applied laterally at the floor level and preferably at the center of mass to the structure.
The second method, which seems to be more logical and convenient, is to select the Auto option in the Auto Lateral Load column and then click on the Modify Lateral Load button so that a new page appears as shown below and the necessary settings are made there.
On this page, in the Base Load Case section, the corresponding gravity load case is selected.
In the Load Ratio section, enter the number 0.002 (according to the regulation of clause 10-2-7-1-5, part 2) or any other desired number. (This number is by default in the program)
In the Notional Load Direction section, to apply the load, choose from two options Global X and Global Y. You can see the images of how to apply the notional load in ITBS in the following.
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This post is written by radinbg