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they are rotary rigs. for the loads i have tower load 750kN (168.6kips) and 3600kN (809.3kips) hook load. I distributed them linearly on 4 line supports. as these foundations will be used in different sites, i need to assign maximum allowable stress on soil, so that the geotechnical engineer...

because the client wants to reuse them. now, the client makes them cast in place, and when he finishes he needs to demolish foundations.

i was assigned with a project to design a precast foundation for a drilling rig. the tower of the rig, the hook load is supported by a truss substructure which lies on concrete foundation. because i need to design it precast, i am constraint by dimensions (not to exceed the foundation weight...

and i have a question regarding the angle between the struts and ties. I found different values of min and max angles. some say min should be 25 and some 45. COuld you tell what is the angle you use? what angle i should use for this problem?

why do you think the soil contribution is negligible? the bearing capacity of the soil is around 25-30 ton/m2. so the horizontal reaction of soil would be around 175-210 tons. So if taking it into account my strut and tie model is shown in the picture...

which moment are you talking about (1200 m.tonf) around what point? you don't consider the weight of the foundation? if i understood you right, you take the moment aroudn the point where the force R is applied ( by the force of 774t*1.6m), am i right? the weight of the foundation is 223ton times...

i don't understand why you think it's unstable! it's a real life example. i just need to understand how the applied force is distributed inside the block, taking into account soil and left beam support.

Ok, first of all. calm down =) on the left of the picture the reaction force R is shown. Which is reaction force coming from a T beam. The T beam is not shown on the picture, but represented as R force. The concept is to decrease some of the 1080 to the left by soil friction and bearing...

ok, all the units are cm. the width of the foundation is 4m. The forces are in short tons. the force on the left is the stabilizing force( it will be a T beam). Which i think will depend on how much pressure the soil can take. it's not a homework. Thank you for your help!

the geometry is fixed. i can't change it. i didn't get why it's a bad geometry, could you explain better? vertical loading is the weight of concrete.

Hi to all, could someone help me with the strut and tie model. I need to design a big foundation. I attach the picture of the problem. thank you.

Yes, it was the support definition. I tried the pinned-roller support and it gave results like from hand calculations. Another questions. The beam will be supported on RC column( there's a neoprene plate between them). So, how do i model this kind of support? I get it should be something...

Hello, I have a problem with designing precast concrete beam of boomerang shape. If you are not familiar with the shape, i attach the picture of it. The problem is finding moment diagram. Solving by hand, i get max moment at the mid section as for normal beam. However, i tried to model the beam...