Structural Engineering - Science topic

Mohamed ElGawady Dear Dr El Gawady,

I hope this message finds you well. I am writing to express my interest in the PhD opportunity you mentioned. I hold a Master’s degree in Geotechnical Engineering and a Bachelor’s degree in Structural Engineering and Construction Management. My academic and professional background has provided me with strong expertise in structural design and analysis, as well as a deep interest in advancing innovative research in areas such as soil-structure interaction, structural analysis, numerical modeling and structural seismic analysis. During my academic journey, I gained substantial experience in numerical modeling, finite element analysis and some experimental techniques and I have consistently demonstrated my ability to work diligently and meet challenges head-on. I am particularly inspired by your work and am eager to contribute to and learn from your research. I have attached my CV, academic transcripts, published papers, seminar presentations, research plan and personal papers for your consideration. I would be delighted to provide additional materials, if needed. Please let me know if you would be available for a brief meeting or call to discuss this opportunity further.

Thank you for considering my application. I look forward to working under your guidance and contributing to your research group.

Best regards,

Omar Heshmat

Mobile: +201063801734

Email: omarheshmat49@gmail.com

o.heshmat@eng.zu.edu.eg

Research Topics

Physics Informed Neural Network

Selase A. K. Kpo Thank you!

Greetings Essam Atwan, thank you for your response; however, according to Chapter 7: Peripheral Buildings of the Federal Emergency Management Agency (FEMA) World Trade Center Building Performance Study there were actually 56 buildings that were damaged on 11 September 2001.I have included the reference below:https://web.archive.org/web/20050913033415/http://www.fema.gov/library/wtcstudy.shtmUnited States Federal Emergency Management Agency (FEMA): World Trade Center Building Performance Study: Data Collection, Preliminary Observations, and Recommendations: FEMA 403, May 2002 [Recovered with the Internet Archive: Wayback Machine]. Also archived at https://archive.vn/9D31r

Thank you, Dear Afyaa Raheem!

Does this work in Python?

Hi Mahdi Haghdoust

For Russian researchers in the field of structural engineering, there are several reputable international and Russian journals where they can consider submitting their papers. Here are some desirable journals that are well-regarded in the structural engineering field:

Define Specific Nodes:

First, make sure you have defined the specific nodes where you want to apply the ground acceleration time history data. You can do this during model creation or by editing the existing model.

Create the Ground Acceleration Function:

You should have the ground acceleration time history data in a format compatible with SAP2000. This could be data provided by real measurements or simulations. Then, in SAP2000, create a ground acceleration function using this data. You can do this by going to "Define" > "Function" > "Time History" in the main menu.

Assign the Ground Acceleration Function:

Once you have created the ground acceleration function, you need to assign it to the specific nodes where you want to apply it. To do this, select the respective nodes in the model view and assign the ground acceleration function in the properties window.

Define Support Restraints:

Since you mentioned having fixed support conditions around the exterior walls of the structure, make sure you have correctly defined these support restraints in SAP2000. This is important to accurately simulate the behavior of the structure under the influence of ground acceleration.

Analyze the Model:

After assigning the ground acceleration functions and defining the support restraints, proceed to analyze the model in SAP2000. During the analysis, the software will take into account the ground acceleration time history data at the specific nodes you have designated.

I recommend this article https://doi.org/10.1016/j.engstruct.2023.117332

When it comes to translation of numbers into diagrams, or charts, I use the chart function in Google sheets:

Select the cells to include in the graph

To create a flowchart, you can:

You can also use the Google Sheets API to create and update charts within spreadsheets.

You can also check out this video:

When it comes to actual drawings, I use Figma.

It is meant to design mock websites and apps, but itis a really powerful design tool that give you a lot of options and it pretty intuitive.

Figma is an all-in-one brainstorming and design tool for teams. It can be used for UI and UX design, online whiteboards, team collaboration, agile workflows, strategic planning, and mind mapping.

And by the way, your example diagram looks pretty good. I would certainly use it in a publication

Dear Mohsen Masoomzadeh ,

Artificial neural networks (ANNs) are machine learning algorithms inspired by the human brain.

ANNs consist of interconnected nodes called neurons, which learn from data to solve problems like image recognition and speech processing. During training, the connections between neurons’ weights are adjusted to minimize errors between the desired and actual output.

Regards,

Shafagat

Dear Mohamaed Ashraf

you working on high rise building but you choose 3floor and the height of each floor 11.5ft, so it is a low rise building(<60ft). you need to find wind pressure P = qh[ (GCpf ) – (GCpi)] (lb/ft2) (N/m2)

Dear Doctor

Go To

"Abstract

Many reports state how serious the problems associated with cracking in reinforced concrete (RC) structures worldwide. The cracking can cause damage and destruction to RC structures. The cracks are the damage to RC structures that require repair or replacement. Analysis of the damage level as early as possible on the RC structure cracks can reduce the greater impact and streamline the cost of repairing the concrete structure. Therefore, non-destructive testing (NDT) method is needed on the RC structure, namely: visual inspection technique. The image obtained from the visual inspection is then analyzed using image processing. After that, the concrete structure with cracks is tested for quality (compressive strength) using the rebound hammer technique with a rebound index. From the image processing and rebound index results, the damage from the cracks that occurred can be concluded so that the repairs become more effective and efficient."

Please modify the material properties especially the Elastic Modulus, as the difference is in the elastic region. Increase the elastic modulus and then try. There may be some other factors as well such as meshing. Please do the mesh independence study as well.

Yes, it is possible to model 2D frames with properties equivalent to those of 3D frames and still achieve accurate results, especially if the buildings you are studying are symmetrical and lack torsion or disarray complexities. This approach can save you a significant amount of time. To perform this task in ETABS, you can follow these steps: 1. Open your ETABS software and create a new model. 2. Define the properties of the materials you will be using in your analysis, such as concrete or steel. 3. Create the 2D frame elements by drawing them on the plan view of your building. Make sure to accurately represent the geometry and connectivity of the 3D moment frames. 4. Assign appropriate section properties to each frame element based on the properties of the corresponding 3D moment frame members. 5. Apply loads to your model, such as dead loads, live loads, or any other relevant loads. 6. Define boundary conditions for your model, including supports and restraints. 7. Run the analysis in ETABS using appropriate analysis settings and methods (e.g., static or dynamic analysis). 8. Review and interpret the results obtained from the analysis, such as member forces, displacements, reactions, etc. It is important to note that while modeling 2D frames can save time, it may not capture all aspects of behavior compared to a full 3D analysis. Therefore, it is recommended to validate your results by comparing them with known benchmarks or conducting additional checks if necessary. If you need further assistance with specific steps or features in ETABS during this process, feel free to ask for more help.

Hello, you can first find some universities and supervisors, and then contact them to seek opportunities to do your Ph.D work. I think they will help you a lot for your application. Good luck to U.

Adjunto una imagen que podría ayudar a tu interrogante:

Can you obtain M-Curv for different angles like(45degree) of a rectangular column ? If you have a openseespy code as an example can you share ?

Hussam Ali Mohammed This link is not working.

Arturo Alexander Sanchez Sipion : Thank you for your reply. :)

I am looking for ways to extract PMM ratio for 3D, which is already computed/generated by ETABS. Your excel has points plotted on 2D surface of either P-M2 or P-M3. Of course, we can write write a code to generate 3D surface of demand of column and then plot P-M2-M3 for computing ratio.

I have the same problem related to cable dynamics, can anyone explain it ?

Use TCP/IP communication.

Dear Muhammad Ashar Ul Aleem,

Considering the long term trends in construction, climate change etc. then I would suggest the following research topic on civil engineering issues with the impact of water: Analysis of technological determinants, new construction technologies enabling the creation of autonomous intakes for drinking water (or other water with water treatment facilities) at residential, institutional, industrial buildings, etc. The importance of this topic will increase in the future due to the increasing frequency and severity of droughts and heatwaves in various regions of the world. On the other hand, newly built apartment blocks, housing estates, apartment buildings, office buildings, factory halls, etc. should be built to withstand floods, violent storms and gales. Such weather anomalies and other effects of climate change, including the progressive process of global warming are likely to become more frequent in the future, over the next decades and well into the current 21st century. In addition, various other environmental issues can be taken into account as part of this type of construction, with the aim of taking greater account of local environmental factors right from the design stage of a building project. Consideration can also be given to the use of natural, renewable energy-producing building materials, green building materials enabling the construction of energy-independent, zero-emission, zero-energy houses, etc. Also, the inclusion in the building design of the installation of an in-house power plant for electricity and independent heat sources is an important issue in the context of the current energy crisis and the future climate crisis. In this way, through the use of green building technologies and eco-innovations in building materials, combined with the issue of the various categories of safety related to water and weather anomalies, new houses can be built as safe in many respects and in accordance with the sustainability goals, according to the formula of sustainable green building. Therefore, increasing security in terms of the availability of drinking water and anti-crisis security associated with increasingly frequent climatic disasters is becoming particularly important and will continue to grow in importance in the future. In view of the above, if you are looking for a forward-looking and developmental topic for your scientific work, I have just given an example of such a topic.

Best regards,

Dariusz Prokopowicz

Here is the latest published Modelling Guide for Timber Structures developed by more than 100 global experts: https://web.fpinnovations.ca/modelling/. Chaper 4.1 discusses the constitute models for wood-based products and key modelling considerations, and Chaper 4.3 discusses how to simulate the lumber-, veneer-, and strand-based wood products.

Here they present a cost depending on the core material. Consider inflation and that's it.

Guerrero, H. et al.(2017) ‘Evaluation of the economic benefits of using Buckling-Restrained Braces in hospital structures located in very soft soils’, Engineering Structures, 136, pp. 406–419. doi: 10.1016/j.engstruct.2017.01.038.

Dear Raheel,

For your GFRP part, the Hashin Damage in Abaqus (both initiation and evolution) can be used only with Continuum Shell elements (and not the 3D Stress/C3D8R elements). You need to create a new Section with category of Shell and Type of Homogeneous or Composite. Then you need to replace this newly created section with your existent GFRP Section for your RHS Part. Next, you need to change your Element Type (in Mesh Module), for your RHS part only, to Continuum Shell/SC8R (you can find it in the Family list in the Element Type window).

I hop this helps!

Based on the picture, the case in my opinion is relatively easy. From the existing data you can control the shear stability, rolling stability and bearing capacity stability, and what is important is the ability of the material as a retaining wall. If you have doubts about the gravel in front of the retaining wall then in the design it is neglected so that the construction is safer but rather wasteful.

Short answer: I don't know.

Longer answer: There is potential for designs to be more physics or performance based than they have been in the past because there are less restrictions to fabricating buildings. The mathematics of optimization and solution of inverse problems is well established. The problem is that classical building doctrine is based on lots of experience, most of which is not encoded into the conclusions. To be superior, PBSD will have to optimize along several axes simultaneously, and the designer will have to capture all failure modes. I suspect there will be some (more) spectacular failures before the new design doctrine is established.

I will be starting a project soon on improving aerostructures using additive manufacturing and meta-materials, so I hope to be better informed in a year or so, but for now, I don't really know.

Study the Petronas twin tower connections and you will understand the concept of connecting towers with dampers.

Dear Shuraik Kader,

In view of the increasing risk of an energy and climate crisis, eco-innovation-based, green building technologies will be developed in the future to build homes that are significantly more energy-efficient and resistant to the negative effects of climate change. Consequently, the future will mainly develop pro-environmental, energy-efficient sustainable construction. Perhaps it will also be environmentally neutral construction based solely on natural building materials.

Best regards,

Dariusz

Damages in the structures are the result of distress due to bending, shear, bond, torsion, fatigue or any such action. The resulting phenomenon will be cracks and deformation which may become so significant that the stricture may not be serviceable. collapse in the structure is with large deformation which may not be recoverable. In fact in limit state design a structure will reach a collapse stage when it will have plastic hinges equal to its indeterminacy plus one that is becomes collapse mechanism (due to static mechanism or kinematic mechanism).

dear Abolfazl Najafi thanks a lot for this suggestion

i think there is a lack time between opensees anb matlab run time it means when tcl try to write text file, matlab needs to read more data in text file and give error

after all i think working with python and openseespy library is the best choice for this goal.

wish you best

Thank you very much, I'm going to check them out

Dear Muhammad Ichsan

Nice and important question and nice answers. As a maybe late comment (probably you already do not need the answer), there is legalized comment on the integration step in the seismic standard of New Zealand; see the references below:

[1] NZS 1170.5 Supp 1. Structural Design Actions - Part 5: Earthquake Actions. Standards New-Zealand, New Zealand, 2004.

[2] NZS 1170. Structural Design Actions, Part 5: Earthquake Actions-New Zealand. New Zealand, 2004.

according to which the digitization step of the earthquake acceleration is an upper-bound of the time integration step. Still, there are techniques and methods suggested for using integration steps larger than the earthquakes steps. I have recently presented a review on one of them, where you can also see explanations about the others. The reference, also attached, is

A. Soroushian. A technique for time integration with steps larger than the excitation steps: Review of the past addressing the existing challenges and a perspective of the future. In Proceedings of 8th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COMPDYN2021), Athens, Greece, June 28-30, 2021.

In any way, as also implied in the response of dear Iolanda-Gabriela Craifaleanu , according to reference such as the Structural Dynamics book of Clough and Penzien 1993 and even main references from numerical solution of initial value problems, for the sake of responses sufficient accuracy, the time integration analysis need to be repeated with smaller steps once or by times . . . .

OK. many sincere thanks for your kind attention, and best wishes for all of the people in this question group especially regarding health and happiness . . . . . .

Dear Mahdi,

Greetings.

Buc-Wen is usually being used to model base-isolated systems. The model has been employed for so long, indicating its high accuracy in predicting the nonlinear behavior of such systems. However, the issue is that such a model requires solving differential equations (numerically) to estimate the modeling parameters, which sometimes requires rigorous efforts.

There is an alternative to that material. The algebraic material existing in OpenSees (https://opensees.github.io/OpenSeesDocumentation/user/manual/material/uniaxialMaterials/HystereticPoly.html) is a new type of material that brilliantly overcome such a shortcoming and matches to existing experimental tests.

The related resources are:

1-

2-

There is also a MATLAB program (ParIde) developed by the authors that can help you estimate the modeling parameters. The model is numerically accurate since I have tested it against multiple loading protocols.

BR.

Solution development based on proven technologies.

What are these proof-values: Reliability, ROI, TCO, ease of use.

How to check what's best: Monitoring, Predictive Measurement and Analytics, etc.

Invariably the loading on one storey building roof with access is only `1.5 to 2 kN/m2 . and this is uni-formally distributed load. But if you pile up load in a small area more than the failure load of slab with concentrated load then the failure is imminent. this failure load can be calculated using yield line theory or by Hillerborg Strip method.

If you have this kind of loading then keep your props intact before you finish roof top work

probably hydrogen evolution. as you're using a lot of current, the cathode is probably more negative than -1100mV so water is breaking down.

Hello,

First, you need to know what your damage initiation criterion is? After completing your job, select the damage initiation criterion from the Field Output dialog box. Check the frames and legend. Find out when the first point value is greater than one. You can read the time from the step time. To find the point location, select the Contour from the options menu, then go to the Limits tab, and toggle on the Show location to observe the location of the point.

Also, you can refer to this link: https://caeassistant.com/product/abaqus-for-beginners-structural-engineers-in-the-field-of-civil-engineering/

The main foundations of the finite element method (FEM) are based on a purely mathematical theory using matrix notations and partial differential equations that can be applied, so it is an approximation method for engineering problems, all connected through simulation.

Please, see the following helpful link:

I could solve the same problem by increasing the global seed size in Mesh Module, i.e. 20 to 22 (error: Element X (IDCOUP3P with Y nodes and Z dofs) requires more than 2GB of memory for storage.).

Check herein

You might find the answer in this link

Also check please the following good link: https://www.studentsmeet.org/structural-engineering-phd-thesis-topics-to-consider/

This problem is relatively easily solved by the variational method. I can give you consultation.

Greetings,

You can also consider this:

In the ABAQUS program, you need to select one hysteresis models which have similarities to your experimental curve.

Bio-mixes for concrete mixes, plant-based admixtures.

Your interpretation is correct. The lateral loading due to wind and the moments due to rotating blades result in the problem.

Painting it black or some other material that absorbs light energy.

Kindly work on materials like concrete, engineered timber and vibration induced cracks modelling.

That depends on the loading both axially and laterally but in most cases it should be more than 450 mm.

This is a good question.

This is a good question.

This is a good question.

Research Topics

📷

Student Research

Attaching Light Rail to a Floating Bridge

Researchers: Master’s student Kristina Tsvetanova, alumni Travis Thonstad and Matthew Sisley

Sustainable Earthquake Resilient Buildings

Researchers: Sarah Wichman, master’s student

Please find the paper in the attachment

This is due to the angle of friction of concrete.It is 45 degree . Hence it id d.

Hi Almahdi Mohamed Araba ,

Have you found out how to model cohesive element (COH2D) to apply interaction between a reinforcing bar as Wire and Concrete in 2D-FE? Am looking for the same.

Best Regard,

Naveen.

Rightly pointed by Dr. Nanda. You search the topic as per your interest and go on reading all published work in that area. Definitely you will find the research gap what ever may be the topic.

For JONSWAP, please check:

https://www.researchgate.net/publication/339272195_Development_of_submarine_cable_hydrodynamic_loads_calculation_program_using_MATLAB

For simple PM, please check pages 6 to 8:

Dear Kunal . ,

You can use steel fibres or rubber strips and so on to increase the tensile strength of concrete.

Hi Mahmoud Alhalaby,

Sir, is it possible to ask for your model. I am currently modeling it in Abaqus, but having some problems with the interactions.

Here's my email (benjamin.rabangiii@yahoo.com) if it is okay.

In my opinion, ETABS and SAP2000 are good for structural analysis and design and ABAQUS is a good software for research.

Can anyone tell me how to solve this error Message in ANSYS apdl?

Question

When I perform current solution of my model it shows following message

" The current solution may have been produced using different model or boundary condition data than is currently stored. POST1 result may be erroneous unless you a new solution using the stored data."

thanks

Thanks a lot, Dear Armin Huß

All of which have been created for a reason. It is up to you what you want to calculate? If you want to work in a finite element area, ABAQUS is a good choice. To analyze and design high-rise buildings under lateral loads, ETABS is great, and also, if you are looking for a 2D pushover analysis, SAP2000 and in case of 3D pushover analysis, PERFORM-3D are proper choices.

I also worked at chimneys on ANSYS.

This is for braced frame,

Thanks

Because a Part of the unbalanced moment is transmitted by punching shear.

Are you modeling a linear problem or a nonlinear one? Section designer may not consider reinforcement correctly in nonlinear analysis.