Questions tagged [structural-analysis]

Structural analysis is the determination of the effects of loads on physical structures and their components. Structures subject to this type of analysis include all that must withstand loads, such as buildings, bridges, vehicles, furniture, soil strata, prostheses and biological tissue.

Filter by
Sorted by
Tagged with
2
votes
2answers
64 views

Why conduct experiment for load distribution within three triangulated structural frameworks when you can calculate theoretically

So we are doing this project on conducting an experiment to investigate the Statical Equilibrium of Plane Frameworks. Why do we need to conduct such experiments when we can easily calculate by hand ...
-1
votes
2answers
99 views

How dangerous are these new rail guns on the U.S. Navy ships?

I was reading an article on them, and I thought should these become the main weapons of the ship then a single EMP could disarm them. Then that brought up the questions: Are EMP s still just sci-fi? ...
1
vote
0answers
342 views

Maximum slope of the road for a car pulling a trailer

I have a five meter long, 2.40 meter wide, 200 kg portable catamaran I've built at home. To transport, I bought a semi-finished trailer, just the running chassis; and built the upper structure, namely ...
-2
votes
1answer
53 views

HELP Please! Depth of member

What is meant by "depth of member" and what is the formula of it? Can I use it in moment of inertia formula? How to use the given information to answer the question? and Thank you.
1
vote
1answer
296 views

Internal load in cremona diagram

Suppose we have the following truss-like structure, with a load of 1N on the middle joint and two reactions on the bottom joints. If I try to analyze this using a Cremona diagram, I run into the ...
-1
votes
1answer
478 views

Beam-to-Column-Stiffness ratio

This parameter defines the structural behavior, defining shear or flexure behavior of the structure. How do I use this parameter to define the stiffness matrix of the structure to perform dynamic ...
1
vote
2answers
115 views

Increasing the stiffnes of a structure by adding stiffener, but at the same time reducing main surface thickness

Let's say I'm designing a table surface which has to be stiff, rigid, but at the same time, not too heavy. It is rectangular in shape and ratio of length:width is quite large. It is only supported on ...
1
vote
0answers
477 views

How can I use the bending stiffness of corrugated cardboard to determine maximum stacking heights of pallets loaded with glass bottles?

I am doing a project at the moment which involves improving the packaging operation at work. Right now I am looking at ways to improve packaging selection based on engineering principles, rather than ...
3
votes
0answers
208 views

How to integrate ∫vᵢ(uᵢ² + vᵢ²)dA in calculating monosymmetry index of an angle?

I saw this question asking about calculating monosymmetry index of an unequal angle. What I need is a formula to calculate $\int v_i{(u_i}^2 + {v_i}^2)\text{d}A$, given the depth $d$, breadth $b$ and ...
0
votes
1answer
219 views

What lining design holds better for a tunnel? Spiral lining or cylindrical lining?

Hy everyone :) I don't know much about structural engineering, maybe spiral lining and cylindrical lining are not the proper ...
2
votes
0answers
51 views

Affect of Cast in Pipes in a 1m thick Raft Slab on shear

I am designing a 1m thick raft slab and the drainage guys have thrown in 100mm diameter cast in pipes all over the raft. See Attached images 1 & 2. Wondering how this will affect the shear in the ...
0
votes
1answer
228 views

Advice for designing internal structure of glider wing

I am interested in designing a scale model semi-monocoque wing for a glider. I've done some research on the framework and internal structure. I have found out about the spars, ribs and stringers and I ...
-1
votes
2answers
249 views

How are single tube bicycles prevented from collapsing?

From time to time I come across bicycles with a particular geometry (or rather a lack of). Most of them have no seat and a single tube which simply connects wheels and has the bottom bracket (if that ...
1
vote
2answers
371 views

How to analyse a beam considering P-delta effect?

I want to do some analysis of an axially loaded simply supported beam considering P-delta effect. I set up a non-linear load case and apply axial load to it. Subsequent analysis of live load and dead ...
2
votes
1answer
319 views

How to calculate bending of shell

I'm an electrical engineer, so please bear with me :). I came across this situation and I tried to find some equations to solve it, but all I could find was some Finite Element Theory, and I was ...
2
votes
2answers
4k views

What is the bending moment formula for continuously supported beam of equal span?

Is there a standard chart in Eurocode for the maximum and minimum bending moment in uniformly loaded beam for indeterminate structures where we can use directly? Many textbooks give different ...
2
votes
1answer
145 views

How to calculate the lateral bending capacity of a laced strut?

The vertical bending capacity of a twin UB laced strut can be calculated by $M_c = p_y \cdot 2Z_x$. Where $Z_x$ is the section modulus of a single UB section about its major axis. For lateral bending ...
3
votes
2answers
204 views

Is it possible to apply different boundary conditions on the same model for different load cases?

Instead of creating multiple bridge models with different boundary conditions for differential settlement, and combining the forces output manually in Excel, is it possible to specify different ...
3
votes
1answer
392 views

Should sum of all joint reactions be zero when nodal displacement is applied?

I created a structural model of a laced strut using plate elements. To study second order effects of bow imperfection, I applied a joint displacement of 20 mm in a SAP 2000 v18 model. When the ...
3
votes
2answers
315 views

How to deal with rotation of an element in theory of elasticity?

As you know in linear theory of elasticity equations for strains are given as (according to picture): But what will be if an element will just rotate (strain equation is on the picture): Intuitively ...
0
votes
1answer
279 views

Mat foundation Reinforcement with 3 layers

I have a mat foundation that is 3 m thick (44 story building), I know how to design the upper layer and bottom layer but since at the top layer the reinforcement is too dense I want to make a third ...
3
votes
3answers
5k views

Building Uplift due to water pressure

I have a building that is 7 story height (which 5 stories are basement floors which means they are underground) My water level is at 1.5 m from the surface. the stories have typical rectangular shape ...
4
votes
2answers
4k views

How to calculate principal moment of inertia of an unequal angle?

Is there a formula to calculate the moment of inertia of an unequal angle? I am not talking about x or y direction but the maximum and minimum moment of inertia about its rotated axes (usually ...
2
votes
1answer
80 views

Is it necessary to consider temperature effect on waling?

Many text book literature on braced excavation mention the necessity to consider additional load due to temperature effect on struts. But nothing is mentioned about waling. Why is this so? Wouldn't ...
1
vote
0answers
248 views

What are the general consideration for tendon profile in a post tension slab?

How the tendon profile is calculated for banded-distributed disposition? In the following figure why is the tendons profile one in the top fiber and the second in the bottom fiber? If the location is ...
0
votes
0answers
36 views

Which case is used to check Drift and P-delta for a building subject to seismic forces?

Which case is used to check the drift and P-delta for a building according to ASCE ? Static lateral force procedure (with a period Comparing T the real fundamental period with CuTa) Static lateral ...
1
vote
1answer
2k views

How the connection is between a Hollow core slab and an embedded beam?

If I have a rectangular embedded beam in a slab supporting hollow core slab how is the connection and detailing between these two elements ? (any sketch would help) If the beam parallel to the hollow ...
1
vote
1answer
2k views

How is the detailing of the intersection between two RC beams perpendicular to each other?

In the below picture I want to design B4 and B6 but I am not sure which one does support the other and how the detailing of the area of intersection between these two beams? Is it better that B6 ...
1
vote
0answers
237 views

How to calculate monosymmetry index of an unequal angle? [closed]

I saw some formula involving integration. Is there a straightforward formula to calculate this instead given b, d, t and alpha angle between x-x and u-u axis?
1
vote
1answer
148 views

What is the thickness criteria to consider a beam with changing thickness Continuous?

I have a beam as shown below that have a span having 60 cm in thickness and the other spans 30 cm do I consider this beam as continuous or does the changing in thickness affect that ? if there is ...
2
votes
0answers
635 views

how to release specific degree of freedom in ANSYS Workbench?

I'm designing a truss which has 9 elements in ANSYS Workbench. since it is a truss, all of the elements are truss elements and can not tolerate momentum. I used <...
2
votes
1answer
79 views

is a cylindrical pylon just as sturdy as a cubical one of the same volume?

I'm wondering if the structural integrity of a solid cylindrical pylon is just as sturdy as a cubical one of the same volume given that they're both the same height.
1
vote
0answers
597 views

What is the minimum diameter for vertical bars in a column according to ACI?

What is the minimum for vertical bars in a column according to ACI and I am looking for a particular condition where diameter must be greater than 0.625 in. (when using S-concrete for column design it ...
2
votes
1answer
3k views

Do we need to check punching shear when a drop beam is connecting columns?

If we have a series of columns as shown in the picture below and to reduce deflection of the slab between two columns that are 11.7 m apart we placed a drop beam 30 x 100 cm (the slab is 35 cm thick) ...
2
votes
1answer
1k views

At What height do we splice vertical bars in Columns and Shear walls?

At what height do we splice the vertical bars in columns and shear walls is it at the middle of the element or at the bottom ( Slab level) and why ?
2
votes
1answer
641 views

round vs hexagon [closed]

I want to make a durable lightweight container that maintains it's shape, I am aware that a hexagon shape has the best compression ratio, but does that translate into a stronger more robust structure? ...
2
votes
1answer
1k views

What is the difference between Ordinary reinforced concrete shear walls and special reinforced concrete shear walls?

In ASCE 7-10 Table 12.2-1 two types of shear walls can be used ordinary reinforced concrete shear walls and special reinforced concrete shear walls what is it the difference between these walls ? (...
4
votes
3answers
115k views

How to determine fixed end moment in beam?

Why the Fixed End Moment (FEM) for BC is 3PL / 16? It's clear in the first figure that that when one end is fixed, while the another end is pinned, then the fixed end moment is 3PL /16 ... But for ...
0
votes
3answers
2k views

why fixed end moment in beam confusion

I don't understand the fixed end moment AE and also fixed end moment EA ? shouldn't they be the same ? For the fixed moment AE / fixed moment EA , shouldn't it = -10(2) +5(2) = -10 , for fixed end ...
3
votes
1answer
546 views

Do we need to use cracked section in Fundamental period calculation for a building?

When using modal analysis to determine the building period do we need to use the stiffness modifiers (or in another word use the cracked section) to calculate the building period ? Can Anyone refer to ...
3
votes
1answer
968 views

What is the stiffness modifiers for a prestressed slab?

According to ACI the stiffness modifier for moment of inertia for flat plate and flat slabs is 0.25 (ACI318/318R-02 10.11.1) to mitigate for the cracked section. But in a prestressed slab (post-...
2
votes
1answer
93 views

Expressing Derivative of Cable Tension Component

I am looking at Hibbeler's section on a `Cable Subjected to a Distributed Load' in Engineering Mechanics - Statics, Ed13, as shown in the attached images. I am getting stuck deriving equation (7-7). ...
1
vote
1answer
759 views

fixed end moment

In the book (photo 1 ) , it's stated at the left span, the fixed end moment is clockwise , while on the right span , the fixed end moment is anticlockwise . But , accroding to wiki (photo2) , it's ...
1
vote
0answers
24 views

Is it possible that a considerably thicker portion of slab would decrease the moment capacity of a raft slab

If I Design this slab as a flat 1500mm thick slab throughout ignoring the step will the design be conservative. I'm worried the extra stiffness created by the step, will attract the moment into the ...
1
vote
1answer
45 views

Load conversion for geotech problem

This is a basic question but for some reason it has me stumped. I am modeling a continuous load on a soil layer on a commercial FEA package. This is a plane strain problem where the layer is modelled ...
0
votes
1answer
40 views

Validation of Lightweight Chassis (measuring deflection of structures/strain gauging)

How can we validate the structural integrity of a small lightweight chassis manufactured from 6063-T6 aluminium that has been welded and then heat treated (back to t6 condition)? A simple FEA model ...
0
votes
1answer
89 views

Relation Between Distributed Load and Shear

I saw the following extract from Hibbeler's 'Mechanical Engineering - Statics, 13th Ed'; The general result $\frac{dV}{dx} = w(x)$ seems to rely on the shear forces at the interface acting in ...
2
votes
1answer
465 views

Reaction force on a beam

I have the following problem most of which I have calculated but have a difficulty with the beam under angle. The angle is 56,30 degress. I just cannot figure out how the forces there are acting - the ...
0
votes
2answers
1k views

Can Dynamic Base shear be greater than Static Base shear?

I just modeled a High-rise building of 43 stories with an area of 700 square meter, Using ETABS as a software to model the building I got the Static and Dynamic Base Shear as the image below, my ...
7
votes
1answer
3k views

Principle of Virtual Work vs Castigliano's (Second) Theorem

I had a look online and into some literature however I did not seem to find a good comparison for the two different methods. They are both used for determining displacements and slopes (rotation by ...

1
5 6
7
8 9