elevator curtain

[rifatdagdelen27]

After defining the beam-free raft foundation and defining the foundation floor space between the elevator curtains, the lower level of the curtains is entered and data is entered into the program. We can close the tie beam in the open part of the elevator curtains (U-shaped curtain). After that, we can introduce the floor edge around the elevator and lay it on the lower level of the curtain. When we solve it, it is usually a negative raft result. Wouldn't it be enough just to create a floor space and lower the curtain? Good work...

 

[Godfrey]

Dear rifatdagdelen27, It is normal to get a negative result for the raft plate in the dimensions of the elevator bucket, which is defined to the bottom of the shaft for the elevator bucket foundation. Since there are extreme internal forces in the elevator bucket, of course, you cannot always meet these forces with a small-sized raft plate. You asked if we could just lower the elevator bucket curtains without identifying the plaque. If you do this, ideCAD defines a built-in foundation directly at the bottom of these curtains, because if it does not do this, the stiffness matrix will be singular, and it will push the system to mathematical insoluble. Well, if you ask if it is actually necessary, yes, it is necessary, because if the elevator curtains do not sit on a sufficiently rigid foundation, the degrees of freedom that must be retained on the foundation show free translation and rotation behavior, in other words, the curtains that you entrust the structural safety with lose their function. Good work...

 

[NYILMAZ]

I think that many mistakes are made in the design of elevator curtains and shafts. I see a lot of questions and problems come to the forum on this subject. I've been wanting to share something and open a discussion about this for a long time. I would like to take this opportunity to share my views below. I think that the contributions of those who want to add or remove something will lead me and other friends to the right path. Now I want to examine the foundation-elevator system designed in two different ways. If there is a curtain system that presses on the main raft foundation (picture 1), it is not correct for me to reduce it to a lower quota and define a foundation underneath and try to calculate it. Because in this case, the curtains, which are already connected to the main foundation, do not transmit the load down like electricity. In order for these curtains to transmit the load down, the main foundation must be broken through the green dots shown in the picture. In this system, the loads of the raft at the bottom of the well consist of the loads in the well (marked in green). In my opinion, there is no such burden. Because that area has nothing to do with the repair of the elevator, except that it allows people to enter. There may only be some pressure of the main raft foundation. Is such a figure wrong? No. However, the system inside the well (both the extension of the curtains and the foundation system) is a completely constructive structure. It does not need to be taken into account, but a drawing must be given in terms of manufacturing. In this method, the elevator curtains, which are generally very ineffective in the system, work more integrated with the structure and make a positive contribution to the structure. It has two important handicaps: First; High stresses arise due to the fact that the walls press on the very edge of the main foundation, and secondly, during the manufacture, under the junction point of the main foundation and the wall, the gap resulting from excavation cannot be filled to meet the superstructure stresses. Let's come to the second method; In this method, the elevator curtain system and its foundation are separated from the main foundation as they are. (picture 2) Here, all the loads of the curtains are naturally carried by the foundation below them. Is it wrong? No. This system is also correct. But as I mentioned above, the elevator curtains[/u][/b], which are generally very ineffective in the system anyway, work integrated with the structure and have minimal positive contribution to the structure, and have the risk of moving independently inside the building. There will be a tower of 15-20 m (for 5-6 storey buildings). The basic system of this tower; In terms of both thickness and width (blue lines), maybe it is wide enough to go under the main foundation system. Or it may be necessary to make a large tear in the main raft. I think that engineering foresight comes to the fore here, aside from calculations, books and programs. With love....

 

[Godfrey]

Good night everyone, If I am in favor of making the elevator shaft foundation as Nedim Bey shows in the 1st picture, but more rigid. For example, I always take the side walls and bottom plate of the well close to or equal to the main raft foundation (continuous foundation). Such elevator bucket curtains sit on a rigid pedestal. Therefore, as we accept in the calculations, the curtain foundations act as built-in. In addition, if the transition from lean concrete at the bottom of the well to lean concrete under the main raft foundation on the upper level is not made at an angle of 30 or 45 degrees, excessive stress concentrations occur in the step, which is the point that 95% misses. Good work...