Civil Engineering

Civil Engineering

  • Mohamed Darwish added an answer:
    1
    Can anyone refer me to papers regarding recyclling construction and household waste to high quality sand?

    I'm interested in the topic of manufactured sand.

    Mohamed Darwish

    Search for a paper coauthored by Farah Eltawil and Mohamed Abouzeid and another one published by Farahat and Ezzeldin

  • Sohaib Al Ani added an answer:
    5
    What are the main Characteristics of Construction Projects ?

    I have gone over many resources to figure out the clear picture about features and Characteristics of construction projects but still I believe the materials that presenting the topic inadequate

    Sohaib Al Ani

    Hello Janaka,

    I believe that what you mentioned are more related to construction project specifications, rather than to construction project characteristics , characteristics like every project is unique , construction projects are fragmented , and have temporary organizations ...etc , you can extend the subject to the construction industry comparing with other industries.

  • William F. Hansen added an answer:
    2
    What are the main problems in arid regions hydrology?

    Let's try to make an updated challenges list for arid regions hydrology

    William F. Hansen

    I have visited, but not worked in truly arid areas, so my views are slanted to what I have read, seen on trips, learned.  Lack of rain = poor plant cover = poor root density = maybe poor infiltration = high potential for  non-wettable soils; and in areas with short term, intense rain, high runoff, potential for flash flood, severe channel erosion or gullying, limited riparian areas, limited habitat for life, just a few species that are adapted to the harsh conditions.  Soil development is limited.  If there is grazing, food is so scarce that overgrazing may be a problem.  Streams are typically dry, loosing streams with little or no groundwater access.  Permanrnt water holes with good watEr are in high demand, and potentially easily polluted.  ET demand is vey high, so plants and animals may have mechanisms to retain water, respond quickly to rain for reproduction and may almost go dormant.  Poisonous species cannot afford to loose prey, so they may be extra poisonous.  Organic accumulation on soils is generally limited, favors barrens of exposed soils.  Erosion can actually be higher in some arid areas than areas with ample rain.  Water for human uses, would typically be limited.  Water, where it is found is the most important thing for life and development, so planning or allocating its use is important --whoever controls the water, likely controls everything else.  It takes well adapted individuals and species to survive and flourish in the harshness.  However, I once heard a story of using soil scallops (rounded pits) to plant trees, capture rain for each plant that eventually grew to forest with flowing streams, etc.  plant recovery with native species may help reverse some of the issues so the areas are better able to support life.  Water capturing and storage may help too.  Natural recovery is limited.  If recovery is possible, there will be times such as drier periods, when everyone must sacrifice to help benefit and maintain the recovery, converting desert or barrens to vegetated or forested lands.  Analyzing options and  potential for recovery, conservation and careful management are very important considerations.  For those who try to convert them, the chance of failure may be high and depend on a high degree of commitment.

  • Alessandro Zanarini added an answer:
    7
    Does anyone know public open large datasets with data collected from sensors like accelerometer?

    Does anyone know public open large datasets with data collected from sensors mainly those from accelerometer used in structural health monitoring that we can use in research projects?

    Alessandro Zanarini

    Have a look at http://www.openmodal.com/ , may be you can get involved in this project, contributing yourself to an open algorithm development.

  • Francesca Guidolin added an answer:
    7
    Are there any structural benefits of constructing double shell domes?

    I am working on Iranian Domes. There are many double-shell domes in Iran. I know that making double-shell dome helps heat insulation, but I wonder if there is any structural benefit of making double-shell dome. Could you provide some reference? 

    Francesca Guidolin

    Dear Soudabeh Pashaei,

    an interesting historical reference could be the Brunelleschi Dome in Florence. Here there is a funny and simple video in which you can find out how it works! https://www.youtube.com/watch?v=_IOPlGPQPuM

    Best regards!

  • D. V. Minko added an answer:
    5
    How to remove the glass from a alumina crucible?

    Hello, I am preparing a germanate glass, which is being melted in a alumina crucible (1300ºC). However, after the cooling I am having problems to remove the glass from the crucible. Seems that both materials are bonded. Do you recommend some spray, or any kind of material that could be used as a layer, and so could make easier the removal of the glass from the crucible? Or any other choice to make the glass removable.

    PS: I need the entire sheet of glass, not broken pieces.

    D. V. Minko

    Try lubricant graphite or MoS2

  • Tatjana Rukavina added an answer:
    8
    How can i find a valid relationship between international roughness index(IRI) and pavement condition index(PCI)?

    I'm looking for a valid and accurate relationship 

    but i don't know witch relationship is better.
    power models or regression?

    + 1 more attachment

    Tatjana Rukavina

    Dear Hossein,

    i send you link to interesting text which deals with correlation between IRI and PCI. /http://d92016.eos-intl.net/eLibSQL14_D92016_Documents/2014-03_IRI-PCI%20Final%20Report.pdf). Another interesting text is final report of COST354 action but it does not use PCI as a parameter with which you can estimate a condition of road.

    All the best, Tanja

  • Nils Wagner added an answer:
    4
    How can I model a concentrated load in ABAQUS that varies in both time and position?

    Hello everybody,

    my problem is that I want to use a rectangular signal and apply it to multiple nodes in my model. The nodes are all on the surface that is modeled with conventional shell elements. 

    I modeled the signal and I am able to apply it to one node of the model which works perfectly fine. 

    The issue I am having is that the same impulse has to be applied to another node, lets say after 8 nano seconds and to another node after 8 more nano seconds, and so forth, respectively.

    I am thankful you for any suggestions!

    Nils Wagner

    You might be interested in

    https://www.researchgate.net/publication/279771744_the_moving_force_problem_revisited

    https://www.researchgate.net/publication/271324781_THE_MOVING_FORCE_PROBLEM_REVISITED

    + 1 more attachment

  • Ng'ang'a Kibe added an answer:
    2
    I am having some difficulties in importing boreholes data into Groundwater Vistas. My boreholes are in UTM format. how do I add them to GW vistas?

    The boreholes are in UTM and I dont know how to import them. Also when I import a shapefile to GW vistas, it does not come to same position as my grid. Kindly help.

    Ng'ang'a Kibe

    Thanks, I will try and get back to you

  • Md. Parvez Islam added an answer:
    1
    Where can I find tutorials (preferably video) about the nnstart toolbox in MATLAB? or is there any dedicated forum?

    I want to forecast time series data using the nnstart toolbox in MATLAB. I have a few confusions regarding some of the options that i found while running the program like what would be the proper algorithm for my particular case and some others. Can someone please suggest me a book or webpage where can i find explanations regarding these topics?

    Md. Parvez Islam

    Please try the following links:

    http://es.mathworks.com/matlabcentral/answers/?s_cid=nr2ans&term=product%3A%22Neural+Network+Toolbox%22

  • Ariadne Tsambani added an answer:
    1
    How to incrase the granular size of inorganic powder?

    How to incraese the size of the inorganic powder so that it will  chokeing  will not  occur in the coloumn test?

    Plz suggest.. 

    With Regards,

    Manish RANJAN

    Ariadne Tsambani

    Good Morning.Please find attach the following. Regards Ariadne Tsambani

  • Ponkumar Ilango added an answer:
    4
    Whether the sulphur free lignin can be used for clay soil stabilisation?

    civil engineers

    Ponkumar Ilango

    Dear Jayashree Jayakumar,

    Biochar is to increase the fertility of the soils to get agriculture Productivity,This can be used.

    But In Soil load Bearing Capacity will not increase .


    Is lignin a waste product from paper manufacturing industry? Can it be used for soil stabilization? - ResearchGate. Available from: https://www.researchgate.net/post/Is_lignin_a_waste_product_from_paper_manufacturing_industry_Can_it_be_used_for_soil_stabilization [accessed Feb 7, 2016].

  • Khaled Ghaedi added an answer:
    3
    Bond slip in abaqus?

    Hello everybody, I'm trying to model bond slip between frp and concrete in abaqus. I try it with interaction. Can anybody tell me how to define knn kss and ktt? my maximum shear stress is 8,59 with displacement of 0,001. So I thought ktt=kss=8590. But this doesn't work.

    Khaled Ghaedi

    Hi Laura Bauer
    I will send you the data

    Best Lucks

  • George Papazafeiropoulos added an answer:
    3
    Abaqus shell element

    Dear Researchers,

    I would be grateful if someone could tell me how to assign a S9R5 element to a shell plate in Abaqus software and thank you beforehand !

    Best wishes,

    Smail.

    George Papazafeiropoulos

    This is not possible using Abaqus/CAE. You have to edit the input file (*.inp, where * is the name of the file) and modify accordingly the element definition. The element(s) is/are defined with the *Element option. You can contact me for further details.

    Hope this helps,

    George

  • Shouhong Wu added an answer:
    5
    How can I calculate critical shear stress for erosion and deposition?

    For given cohesive or non-cohesive sediment size, how to calculate critical shear stresses for bed erosion and deposition?

    Shouhong Wu

    William, Francois,  and Erwan,

    thanks for the help.

    Shouhong

  • Brian Metrovich added an answer:
    2
    Does anyone know how to calculate the stress intensity factor of 3D penny-shaped internal crack under uniaxial compression?

    Does anyone know how to calculate the stress intensity factor of 3D penny-shaped internal crack under uniaxial compression? If possible, please recommend some references or classical books which describe how to solve such kind of problem. Thx

    The specific information of this problem is show in the attached picture.

    Brian Metrovich

    You can probably use superposition of a couple of load cases found for circular cracks in "The stress analysis of cracks handbook" by Tada, Paris and Irwin.  These are found in section 24 of the handbook.  The solutions are for various crack orientations with respect to normal and shear stresses.  You should be able to obtain reasonable estimates for your case.  Just be careful in your work, since the stress intensity disappears in elastic solutions when the crack tip is closed.  Extend the model to a slight ellipse might be more useful in understanding where the peak K and crack growth actually occur.  The finite boundary effects will need to be approximated in your solution.

  • Douglas D. Gransberg added an answer:
    1
    Does anybody know if there is a correlation between the SRT (skid resistance tester) and the PFT (portable friction tester)? Are there any researches?

    SRT = british pendulum

    Douglas D. Gransberg

    I don't know of any correlations, but if you search the work done by Tom Yeager at NASA Wallops Island pavement lab, you might get lucky.

    Cheers, doug

  • Waldemar Koczkodaj added an answer:
    1
    What's the best Expert Systems Shell in the universal market today? Exsys or VP-Exper or CLIPS or what...?
    To be used mainly in Civil Engineering applications
    Waldemar Koczkodaj

    CLIPS was developed and used by NASA. It is free but ExSys (costs $$$ :) may be easier to use.

    A very good question. I have upvoted it (by hitting once only the little green ^ arrow :)

    Speaking about Arrow (the Nobelist):

    http://cs.laurentian.ca/wkoczkodaj/p/ArrowReadsParadox.pdf

    So, Arrow is good for me :)

  • Joaquin Marti added an answer:
    2
    How to find the damped frequencies of the building?

    I am a civil engineering student and I am studying on how the frequencies of building are affected by different damping ratio. Is there any way I can find the damped frequencies of different modes?

    I have performed the ritz modal analysis in ETABS to find out the natural mode frequencies before but I don't know how to input the damping ratio to the modal case. May someone teach me the correct way to analyze the damped frequencies of building in ETABS?

    Joaquin Marti

    The influence of damping ratio on frequency is rather small and I am not sure you should bother: even a 10% damping ratio modifies the frequency by only 0.5%.

  • Tariq Ahmed Ibn Mohammed Asif asked a question:
    New
    How to design an external and internal Reinforced Concrete beam column joint using Indian Standards (IS) code?
  • Jeevan Kumar Ban asked a question:
    New
    How can I execute breach model using NWS-BREACH?

    I already have application file.

  • Ibrahim Metwally added an answer:
    4
    How I can get fibre concrete modelled using Ansys workbench?

    Hi All,

    I am trying to model fibre cement mortar reinforced with wire mesh using Ansys workbench. The failure surface for a triaxial failure should be defined by using the in the library available properties for nonlinear concrete. To avoid convergence related issues in the nonlinear calculation a multilinear isotropic stress–strain curve is used (from flexural test data? Should I take compression test data?). The Elastic modulus and Poisson ratio of the mortar were determined due to lab tests. Now to model the fibre effect in the mortar the crack interface shear transfer coefficient βt for open cracks is to be 0.3 (but have problems to apply this value in Ansys workbench). My model is not calculating nonlinear behaviour and I am really confused. Question: * am I working in the correct way? 

    Cheers

    Ibrahim Metwally

    you can model RC & fibers separately  

  • Charbel Chapana added an answer:
    3
    How can I obtain cross-section forces and moments?

    Hello everyone,

    I am trying to obtain the history of cross-section forces (forces and bending moments) from a 3D-Shell Model.

    Anyone can give me some suggestion? What should I do to take out cross section forces?

    Thanks in advance.

    Charbel Chapana

    Ali:

    What software you used in your model?

    Anyways, a shell model must be defined for bending moments, so you must fix the conditions of your model in bending forces or forces that causes bending. The results be adquired usually in "stresses results" or in a "abstract results".

    If you need some rapid results, you can use a membrane model. This model have a few DoF, so the time of calculation reduced dramatically, but the results can be mostly the average stresses.

    Best Regards.

  • Serge V. Shil’ko added an answer:
    1
    How to study slip and interface effects of steel confined composite beams under flexure?

    please give the details for experimental set up....

    Serge V. Shil’ko

    Evidently, for the realistic answer on your question, we need in additional information about joint under consideration. Then specialists can help you in methods and setup for the tribological study. All the best, Serge  

  • Lyazid Bouhala added an answer:
    2
    How does XFEM work with two part instances?

    Dear all,

    I have to model three point beam bending test on asphalt concrete beam with geosynthetic interface layer at 2/3rd depth from the top(using abaqus 6.12-3). I have modeled three parts separately i.e.. asphalt, geosynthetic material and cohesive elements(to define interface). When I give the crack region for XFEM crack, there is an error showing that crack region should contain only one instance. Can someone suggest me how to move further in this problem.. Suggestion would be really helpful. Thanks in advance.

    Regards

    Prashanthi

    Lyazid Bouhala

    May be the crack in multi layered materials is not supported. Try to use a small crack region in order to reach one part of the beam only.

  • Divya Brahmavrathan added an answer:
    4
    What are short period structures and long period structures?

    In order to calculate the ductility factor, is it necessary to classify the structure as long/short period structures  per existing literatures? If so, coud anyone please explain how to find if the structure is of short/long period?

    Divya Brahmavrathan

    Thank you Mr. Mohamed Darwish , Mr. George and Miss. Tanya for your answers. 

  • Mohsen Asadi added an answer:
    11
    Does anyone have a suggestion for an open-source FEM-DEM coupling software?

    I Need it for Multi scale modeling.

    Mohsen Asadi

    In the name of god

    Hi Mohammad

    As I understood you are working to model an embankment. coupling DEM with FEM is a good choice to reduce computation cost in modeling of large dimensions. I have worked on Yade ,a discrete element method software. It is capable to link with Escript to combine DEM with FEM. Linux OS is required to run Yade.  More information could be found in:

    https://yade-dem.org/doc/

    https://yade-dem.org/doc/FEMxDEM.html

    Best regards

  • Meera s prasad added an answer:
    5
    Is this Fiber reinforced cementitious matrix available in India and where?

    sir,

    what are experimental requirements while doing this?(flexural strength of concrete using FRCM?

    Meera s prasad

    k sir

  • Wilmar Dario Fernandez-Gomez added an answer:
    6
    Tests needed for determining the viscoelasticity parameters in ABAQUS?

    Hello all, 

    I am new to ABAQUS and I am trying to determine which tests will be needed for determining the viscoelasticity parameters of an adhesive for ABAQUS models.

    I was thinking about tensile testing but viscoelasticty in ABAQUS seems slightly complicated and I am not really sure what I have to do.

    Any suggestions, ideas or papers that deal with the issue?

    Thank you in advance,

    Ioannis

    Wilmar Dario Fernandez-Gomez

    Hello Ioannis. I aggre with all comment of our colleagues. In addition I recommend this paper just in case that you do not have analyze yet. Here you can obtain Prony series parameters for LINEAR Viscoelastic models.

    "Application of Linear Viscoleastic Differential Cosntitutive equation in Abaqus"  Kong and Yuang 2010

    Best regards

    Wilmar

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