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Dear all, I have a rigid body and tried to include its mass into my modelling. I ran gravity load for the whole model (simple beam made of C3D8R). For Rigid body which is connected to the beam by surface-to-surface contact, I defined point mass using Interaction < Special <Point mass of 200 kg...

Dear Bridge engs, I am comparing the various methods used in the practice for calculation of live load distribution factor (LLDF) for various load effects. Please share your approach and the limitation if any that you faced. Also, if someone has S-over equations, I'd be grateful to share it...

Hi all, I have some truck axle loading modelled as patch load as shown below to load a bridge. For interaction property, I used Tangential Behaviour which is affecting the results significantly. I know that there would be some friction in reality when the vehicle tyre is on bridge (stationary...

Hi all, Can someone explain to me what's the application of using load factors when safety increased or decreased. How we can determine if the dead load increases/decreases safety? Besides, what 'site specific measurements' implies? Cheers, Shoot for the Moon, even if U miss, U still...

Hi all, I defined different straight nodal sets to get their coordinates in space using Field output 'COORD'. When I choose Report <Field output to export the coordinates, I have no option to choose the node set; what happens is that all defined node sets come as one file and I have to manually...

Hi all, which resources I can refer to for up to date statistical parameters (mean, COV,...) of bridge structures for various load (LL,DL) and resistances models (R) . I need it for carrying out some reliability analysis. Shoot for the Moon, even if U miss, U still land among Stars!

Hi all, When I run Abaqus command for "abaqus j=name of input file interactive", I do not get any details of analysis and I only can see the start and end of analysis. Is there any way to see the details of analysis (like normal CAE) in terms of time increment, step number, and etc? This way I...

Hi, Is there any idealized stress-strain curve in AS code for steel and prestressed tendons? I know that the values of yield and ultimate strength with corresponding Modulus are provided, but what about the strain at each corresponding stress? For instance, in EC the curve below is given with...

I want to simulated the ultimate load failure pattern of a simply supported reinforced cocnrete beam to have validated Abaqus model. I have all the material data and carried out static load cases finely and verified the model accuracy. Now I want to simulate the loading as that of experiment...

Hi all, Recently I've been involved in assessment of bridges, but I found it takes some time to get familiar with the whole concept. Appreciate if anyone answer the below questions shortly/detailed: 1-when the weight of reinforcement is considered as dead load for assessment? Since when we...

Hi all, I need some references for deflection limits of aluminum members like RHS, SHS, so on. (Like those given in AS3600 L/250 ....) I looked up for AS/NZS 1664.1 but nothing addresses on that matter. Any suggestion would be great [2thumbsup] CHeers, Shoot for the Moon, even if U miss, U...

Hi mates, Is there anyway to carry out POA (nonlinear static analysis) in SAP2000 for shell elements? I know the procedure for frame elements but what about for case of shell elements such as slab of bridge. For example, if I want to load to failure the bridge deck that is made of shell...

Hi all, I've been looking around to find a way in SAP2000 to include the effect of existing reinforcement in the analysis (NOT design). This is what stated by CSI: "How is flexural mild reinforcement added into a bridge model? Answer: In CSiBridge, users may add mild reinforcement through the...

Hi there, Any idea how CSI calculates effective yield stress and effective tensile stress? I couldn't find any documentation for it. Cheers, Shoot for the Moon, even if U miss, U still land among Stars!

Hi there, I need some guidance on applying accidental load (load of railway track on substructural component). I have found the relevant requirements as per Design Code, but since I am rookie at such type of loading, I am not sure how to apply it. Any brief explanation/worked...

Hi all, Can someone explain to me how live load distribution factors can be obtained using refined analysis (like grillage/FE) and simple beam analysis? I would like to compare the LLDF obtained in such manner with that of AASHTO specifications (only for my own understanding!). Any illustrative...

Bridge experts, Any suggestion on computer software for modelling existing reinforcement of bridges? I mean to accurately model the rebar and then assess the bridge using its designed reinforcement. There are heaps of structural software with capabilities of derailed reinforcement modelling...

Hi all, For two signals (one with double values and other with complex values), I obtained corresponding auto and cross spectral densities. When I plot the output (attached figure), cross spectral density is shown in negative region. I know I can take absolute of output, but I would like to...

To consider only material nonlinearity in SAP2000: -what would be the mass source for subsequent load cases after nonlinear dead load as initial case? Two options are available, default mass source and from previous load case. -how to find the point in which materials enters plastic state and...

Hi all, I would like to get forum user's viewpoint about the following cases: -In case of wall-type pier (width >4m) in bridge structures, is it safe practice to consider it as series of separate columns for modelling? Or gross cross section must be used as a single element? _If there's a...