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Turkish Hello, in the Earthquake Code it says that the 30% contribution of the earthquake in the other vertical direction should be taken into account for combinations with earthquakes (Article: 2.7.5). So the seismic combinations are 1.0G + 1.0Q + 1.0Ex + 0.3Ey 1.0G + 1.0Q + 1.0Ey + 0.3Ex and even 0.9G + 1 ,0Ex + 0.3Ey 0.9G + 1.0Ey + 0.3Ex Does the program take this into account? It seems that it does not receive when writing combinations in reports. ---------------------------------------------------------------- ---------------------------------------------------------------- ----------------- There are also expressions and combinations in the combinations for earth thrust as follows. 1.4G+1.6Q+1.6HX1 ±HX1, HX2 : X direction earth thrust 1.4G+1.6Q+1.6HY1 ±HY1, HY2 : Y direction earth thrust 0.9G+1.6HX1 0.9G+1.6HY1 Now, here are two questions there is. 1- The so-called soil thrust does not affect the structure separately from x and y directions. In whichever direction there is soil, they all affect and load the structure at the same time. Loading it separately by dividing it into aspects such as earthquakes can sometimes lead to negative and sometimes positive situations, and it is not true to reality. It is necessary to make a distinction to define the charges, this is understandable, but they must all act together in the solution or combination. So it should be like this 1.4G+1.6Q+1.6H (Hx and Hy together) 2- There are also ±HX1 and ±HY1 expressions. These are perceived as the effect of the soil from opposite directions, ±. Is it possible for the soil thrust to act in the opposite direction? Of course not possible, then what do these ± expressions mean? Good work.
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- Thread starter dabanlio
- Start date
(Item 2.7.5) The addition of 30% of the earthquake force coming from the other direction is not considered through combinations, but through the "raw results-design results" infrastructure available in the program. (If you look at the difference between the raw results and the design results in the element results, you can see the augmentation mentioned). In addition, in reinforced concrete reports, a note is written next to the element to which the relevant article is applied. As for the soil effect, the soil loads entered from the floor parameters are only combined as +, as you wrote in the last version. (Combination as ± is available in older versions and has been changed in the latest version). In addition, this facility is a method of defining soil thrust for compatibility with version 5 of the program and works with a horizontal load logic (like earthquake load) to be applied to the basement rigid diaphragm. In the new versions, it is possible to define the soil load more realistically (for example, only as a lateral load on the perimeter walls) and with the combinations you want, with the added element-based load effect and combination possibilities. In this way, you can define the soil load as the load acting on the building at once (a single H load), or even in the structures sitting on the land with different levels, you can only affect the elements at the back of the building as a variable load.