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By three-dimension brick elements I suppose you mean 8-node bricks. These elements cannot represent properly bending. Technically speaking, much of the potential energy is consumed by spurious modes. In addition, if the beam that you are modeling is very slender you could have a phenomenon...

http://feshortcourse.com/ is a good one

That publication presnts how to calculate the force in the holddowns only. I need the forces on the horizontal straps located at the boundary of the window.

I have to design the (seismic) strengthening of a wood stud wall. The wall is 11’x 8’ with an opening at the center of 3’ x 4’. I don’t know how to compute the tension forces on the reinforcing straps located at top and bottom of the opening. The total shear force is 3000lbs

I have to design the (seismic) strengthening of a wood stud wall. The wall is 11’x 8’ with an opening at the center of 3’ x 4’. I don’t know how to compute the tension forces on the reinforcing straps located at top and bottom of the opening. The total shear force is 3000lbs.

Thanks Lcubed. I appreciate your help

I am designing the roller wheels for a bulkhead. By geometrical limitations the resultant hertz stress is 294 ksi. I am using Cast steel of fy=115 ksi. So the ratio is hertz/fy=2.6. Where could I find an allowable Hertz stress (static loads)? Hertz stress= ??? x fy

Solid Elements with 6 dof per node hasn't been very succesful numerically. Although they are very useful in some applications where you require to combine with shells (delamination problem), or when are combined and beam elements (modeling of bridges). Formulation of elements with rotational...

If you have a near triaxial state of stresses s1~s2~s3, it is not safe to use the Von Mises stress.

I think the basic idea is as follows. 1) The grade is G6.3 according to ISO 1940 2) The max speed is 650 RPM 3) with 1) and 2) I can enter to the graph and compute the Maximum permissible residual unbalance eper 4) U is eper times the weight of the pump 5) Solve My"+Ky=UQ2 Sin(Qt) M and K are...

Actually I am trying to compute the displacements of the beam/slab supporting the pump. So to solve Mx''+K x' = mrQ2 Sin(Qt) I need m and r. Thanks guys for your help.

I am trying to calculate the vibration induced by a water pump that works at 600 rmp. How can I estimate the unbalanced mass?

recentgrad: SAP-2000 if you want to perform complex seismic analysis of buildings and bridges. STAAD have some theoretical deficiencies for plates. GT STRUDL does not report nodal rotations. CMFG

Roadmanpd: Sap2000 is by far a better program than STAAD or GTStrudl. Specially for seismic design. Not to mention the superior Graphic User Interface. SAP2000 is the commercial version of SAP a research programa developed at UC Berkeley. CMFG

Drej: I am no specifically looking for that element (SOLID73), which I also heard that performed very badly, but any solid element that permits using shells, beams, and solids all together. CMFG

CORUS: Some solid elements do have 6 dofs like Solid73 implemented by ANSYS. I am looking for the shape funtions of this element. CMFG

Does anybody know a paper or location in the web where I could find the formulation for a FEM solid element with 6 dof per node? Thanks, CMFG

baker12: I wouldn't buy any of them. MDX graphic interface is really terrible. It use simple rod elements but they call them "finite elements". For programs like this, Aeronautical Engineers call us “low tech engineers”. Stick to a real engineering program: SAP2000 or GTStrudl. CMFG

meher634: There are several things that could be happening. - Boundary conditions in your FEM model. Some times boundaries cannot be assumed either as fully clamped nor as simply supported. - Finite Element used. Solids or shell elements? Shear locking is very common in thin plates modeled...

ToohTaah: You have zero slope in the engineering stress-strain curve. For nonlinear analysis, you should give the true stress-strain curve, in that curve you won't have zero slope. e_true=ln(1 + e_engineering) CMFG