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I hope this forum can help me to understand physical background / interpretation of this option to model damping in Abaqus/Standard: I tried to search the manuals for explanation of how is this implemented and how (or even if) to use this in practical applications for modelling civil structures.

I am new to Ansys (I am reasonably experienced in Abaqus and general FEA) and I am still trying to find my around the manuals. I am interested in Mode Superposition Analysis. The manual (section 3.9.6.3 Mode Selection Based on the Mode Coefficients) talks about modes selection based on...

A colleague of mine is designing a deep beam using S&T method. The beam also experiences some minor axis bending and he asked me how to deal with the biaxial bending. My initial thought is to make sure not to claim same reinforcement bars twice, but apart from that I could not think of anything...

All, we are considering using Fiber Reinforced Concrete in one of our designs. It has not much structural demand on it, but is an odd shape and we need to control cracking. We will, however, need to anchor equipment and potentially some steelwork into it using either cast in or post installed...

All, I am not sure if this is the right forum. I came across this proposal and I question myself: 'Is this really the best way forward?'. Link

I am going through this manual(ASCE 136) to get some understanding of the turbine foundation design. One of the recommendations (3.3.1.6) for an elevated space-frame pedestal foundation is that the total weight of concrete is 3.5 times the machine weight. I am guessing that this is to do with...

Hello forum, I need to look into a case of a steel beam (box cross section) falling on top of a reinforced concrete wall. I am considering two cases: (i) the beam falling freely and (ii) the beam swinging about one of its ends (please see attached for an explanation). The wall in question has...

As a modification of the existing steel structure, parts of it will need to be encased in new concrete walls / slabs. The steel structure has been treated with intumescent paint to provide fire required protection. The modification does not require composite action of the existing steel and the...

I hope there are LS-DYNA experts in this forum. I have come across an FE model which includes a MAT_003 material model for steel. The material is defined using (amongst other parameters) SIGY and ETAN. SIGY is, as I expected, specified equal to a material yield strength, but ETAN is given as...

Considering neoprene bearings of a rectangular / square shape on plan - does its shear stiffness depend on the direction of the applied horizontal load? I did quite a lot of internet research but could not find any information so any pointers would be greatly appreciated. I am not designing /...

http://splash247.com/dramatic-jebel-ali-crane-collapse-caught-on-video/

Hello, I am considering using headed reinforcement bars to anchor bars which are subject to compression. ACI 318, Clause 12.6.3 explicitly rules out use of headed bars in compression, with an explanation that there are no data available to confirm their effectiveness. I am curious to understand...

We are designing a reinforced concrete building on a foundation raft with a reasonably flat bottom surface. A damp proof membrane it so be provided between the foundation and the subgrade soil. There is no indication regarding a coefficient of friction which can be mobilised at this interface to...

I have found a thread regarding the pin conected componets: http://www.eng-tips.com/viewthread.cfm?qid=131763 which gives me almost all the information I need. I am assessing a similar component (existing) and the geometry of the connected pieces does not comply with Table 3.9 of EC3 (BS EN...

Hi, we are doing a response spectrum analysis of a concrete structure modelled with shells (plates) and beams, fixed base. The fundamental horizontal natural frequencies are calcualted in the range where the spectral acceleration is at peak (80% of the mass). However, when we do a response...

Hi, I have recently come across designs of column base plates with shear keys into the concrete foundation made of structural sections (H section or similar) welded to the underside of the base plate. Generally, the checks have involved bending of the section loaded with an assumed contact...

Hello, I have been struggling with this for some time and I can only conclude that some of my basic assumptions are wrong. We need to provide a steel liner (3-5mm thick steel plates) to a single room in a large reinforced concrete structure (~1m thick concrete). The steel liner plates will be...

Hello, we were asked to look into using barites concrete for some shielding walls. I am a bit concerned abut its shrinkage and thermal properties, but cannot find any reference regarding how does it comapre with 'normal' concrete. I would appreciate any information in this respect. Thanks in...

I would like to understand what is a common practice in the US (please note that the design I am working on is not in the US). We need to design a building supporting the crane and there are two possibilities: 1) Crane is going to be used only for a few years during installation of eqipment...

I am not an experienced STAAD user. We have developed a small model do calculate natural frequencies and carry out response spectrum analysis. I am trying to print out most significant mode shapes, but when I print them out some of the deformed shape is curtailed because of inappropriate...