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.
534
questions
0
votes
0
answers
19
views
Will a rectifier based on air gap and flexible foil work?
The white line is a flexible conducting foil suspended on the metal wire. I think the external DC circuit will induce a charge on the flexible part and the other charges move to ground. The charged ...
- 96
0
votes
1
answer
149
views
Mechanism and static determinacy
I was doing exam question and am confused as to how to determine if the structure is a mechanism or not.
Say that j = number of joints, r = total number of reactions, b = number of bars.
For both (a) ...
CommunityBot
- 1
0
votes
1
answer
174
views
how can i find Spectral Acceleration (Sa(T1; 5%))?
I want to do incremental dynamic analysis (IDA) for my project and for hunt and fill algorithm i need the 5% damped Spectral Acceleration at the structure’s first-mode period (Sa(T1; 5%)) . Can i find ...
CommunityBot
- 1
1
vote
2
answers
1k
views
Bending of an L-shaped beam
First post so bear with me:
I am designing a frame for a press, which needs to be able to withstand 250 N. I am planning to make the frame an L-shaped beam, turned around. With a side view, it will ...
CommunityBot
- 1
0
votes
0
answers
11
views
Fixed End Moment for a point load at edge span
Usually, i solved this kind problems by divide into 3 span, AB, BC, CD
Then, using Fixed End Moment and Cross Methode to find the Moment
But, i cant find Fixed End Moment for the point load at the ...
- 1
0
votes
1
answer
31
views
Superposition of cylinder stress and normal stress
I need to calculate the principal stresses for the given cylinder with thick walls inside filled with gas shown on this picture:
I used the Lamé equations, namely:
$$\sigma_{x} = p\cdot\frac{r_{1}^2}{...
- 897
0
votes
1
answer
33
views
How to find Tensile Modulus of a layer of Plain Woven GFRP with GSM of Fabric given
I need to Input "E" the tensile modulus for analysis of a composite layer made from Plain Woven E-Glass Epoxy composite material.
I know the GSM (g/m^2) of fabric is 106.
Using GSM =106, ...
CommunityBot
- 1
0
votes
1
answer
147
views
Calculations of Retaining Wall
If I have to find the maximum bending moment of this retaining wall, is the maximum bending moment located at the toe? If not, where is the location of the maximum bending? In order to find the ...
CommunityBot
- 1
0
votes
2
answers
83
views
Calculate bending moment on cantilevered I beam
I am not an engineer, and the maths that I have seen on other forum posts is beyond me.
I am trying to calculate the load that can be supported by a cantilevered Ibeam.
The data is as follows:
Width: ...
CommunityBot
- 1
1
vote
4
answers
1k
views
Tension cable underneath rafter tie?
I just bought a new property with a large garage and I'm curious about the roof structure. The roof structure is supported entirely on the front/rear walls using rafter and collar ties. The rear wall ...
CommunityBot
- 1
0
votes
1
answer
30
views
Building Below-Grade Octagonal Room - Does this roof provide enough support for wet soil?
Building a small room below grade. Walls/Floor will be grouted stacked stone (apx. Rip-rap size, 2"-8" diameters). Roof design is intended to be set and grouted in on top of stone wall. Soil ...
CommunityBot
- 1
0
votes
1
answer
49
views
Advice on building an aquarium stand
I'm building a kitchen/bar in my unused basement area, and want to incorporate my 180 gallon saltwater aquarium into the design.
Before I decide on a design, I wanted to ask for advice/opinions on ...
CommunityBot
- 1
0
votes
1
answer
33
views
Aluminium tubing strength - size/thickness v length for supporting its own weight
I want to make a simple fruit picker for a tall fig tree. Most of the fruit is lost as it drops when ripe and explodes on impact with the ground below. That or the birds get to it before we do!
So ...
CommunityBot
- 1
0
votes
1
answer
215
views
Bending of a cantilever beam
How is the bending of a cantilever beam negative when, some of the statics methods say otherwise, assuming I am applying them correctly?
When I used the singularity functions method, I obtained a ...
CommunityBot
- 1
0
votes
1
answer
30
views
Predicting breaking force of beam per length based on one testing
I've made a plywood carbon sheet and tested its breaking force, for a 200mm long, 50mm wide, 16mm thick it was 100kg +-
I was wondering if it's enough to help me predict what will be the breaking ...
- 21.6k
1
vote
1
answer
170
views
Modal Response Spectrum analysis
Is "Modal Response Spectrum Analysis" the same as response spectrum analysis? How about modal superposition analysis? This is the same or different? Or all are same?
CommunityBot
- 1
0
votes
1
answer
42
views
Buckling of supported pillar
I am wondering how the "buckling number" of a timber column is altered by having a vertical element attached to it. Blue is the roof, green a concrete wall and black is the timber column and ...
CommunityBot
- 1
0
votes
1
answer
74
views
Why is the unit load facing upwards? Flexibility/Force Method
I used the flexibility method to solve questions like this, so I know you have to have a primary and secondary structure. My primary structure looks like this:
So if I apply my virtual load, I got ...
CommunityBot
- 1
0
votes
1
answer
34
views
How to determine the resistance provided by cement mortar?
I am attaching a steel rail and post guardrail to the coping of an existing parapet. The actions produced by the guardrail on the coping incur at point A as shown below.
However, how do I find out if ...
CommunityBot
- 1
1
vote
0
answers
89
views
What material performs best in this situation?
Take a long, thin rod, say .25 mm in diameter and 200 mm in length.
Filling these fixed dimensions, what kinds of materials could the rod be made of such that it minimizes how much the rod bends under ...
- 11
7
votes
4
answers
6k
views
What is the maximum angle of a shelf angled brace?
So suppose I want to make a single shelf protruding from a wall and to place a heavy object on it (Figure 1). A shelf like this would fail (assuming no internal mounting that penetrates into the wall)....
CommunityBot
- 1
0
votes
2
answers
149
views
Analysis of Machine Frames With Cut Outs
I have a structure that is used to support two shafts which are carrying relatively high loads. It is composed of two columns and a "shaft supporting block" in the centre (almost acting as a beam). ...
CommunityBot
- 1
0
votes
1
answer
132
views
Boundary conditions for a cantilevered Timoshenko Beam
I am trying to find out the boundary conditions for above given Timoshenko beam. The boundary conditions that I have derived are
$x_1 = 0$
$$ \overline{u}_2^L = 0 $$
$$ \phi_3^L = 0 $$
$x_1 = \...
CommunityBot
- 1
0
votes
3
answers
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 ...
CommunityBot
- 1
0
votes
1
answer
23
views
Overweight construction equipment for weight restricted plaza
We have to use our equipment on a elevated plaza that has a weight restriction of 2,400 lbs. per sq. ft. Each tire (4 total) carries a weight of 10,050 lbs. (1/4 of the gross weight of machine 40,200 ...
CommunityBot
- 1
0
votes
2
answers
172
views
General formula for shear force and bending moment
How do you find the general equations for shear force and bending moment?
For example, in this question, UDL = $w = 5.4knm$ and $L = 8.6$:
How do you find the constants of unknown from integration?
CommunityBot
- 1
0
votes
1
answer
158
views
Linear Motion Stage with Offset Loading Problem
I'm currently developing a linear motion system which will have to withstand a large offset load (see image below). There will be two rails, each with a carriage on, which will be connected by a beam/...
CommunityBot
- 1
1
vote
2
answers
79
views
Why is there a negative sign in case of moments caused by longitudinal stresses?
I came across the following relations in the plate theory. I, however, don’t understand the reason for the negative signs in Mx and My. There is, however, no negative sign in Mxy. I am guessing, this ...
CommunityBot
- 1
0
votes
1
answer
26
views
Dlubal Rfem Seismic Analysis
I’m learning Dlubal Rfem recently and I have a problem about seismic analysis. When Equivalent Lateral Load is bigger than Modal base shear;for example on Sap2000 we scale modal base shear and we make ...
CommunityBot
- 1
1
vote
3
answers
267
views
What does negative shear stress mean $\tau \:=\:\frac{VQ}{It\:}$?
$\tau \:=\:\frac{VQ}{It\:}$
My confusion lies within $Q$ term. $Q = yA$ where $A$ is the cross-sectional area of the segment that is connected to the beam at the juncture where the shear flow is ...
CommunityBot
- 1
0
votes
1
answer
248
views
Stress concentrations around rivets in compression
The stress concetration factor for an unfilled hole is around 3, but it decreases when a rivet is present. What factor can we expect for a hole with a rivet in it in compression?
CommunityBot
- 1
0
votes
1
answer
168
views
stress/shear analysis of components
I am working on analyzing a few problems, but have not really come across this type of stress concentration problem. Does anyone know where I can study the analysis of this situation?
Pressing ball ...
CommunityBot
- 1
1
vote
1
answer
53
views
Building a land bridge across the Bering Strait
Would building a land bridge across the Bering Strait be more cost effective then building an actual bridge or tunnel? Much like how the Chinese build artificial islands in the South China Sea.
- 9,527
1
vote
3
answers
415
views
Honeycomb structures vs shear stress
Honeycomb structures are made of top and bottom shells and honeycomb geometry at core. In terms of bending load, maximun normal strains take place on top and bottom hence, sheet parts can support them ...
CommunityBot
- 1
0
votes
3
answers
789
views
What's the best shape (solid of revolution) for a cantilever beam to carry a point load at the free end?
How should you change the diameter/radius (while keeping constant overall volume) of the cross-section along the length of a round cantilever beam so that you minimise deflection with concentrated ...
CommunityBot
- 1
0
votes
1
answer
124
views
Is it possible to convert a structure with a .stl file to a solid structure in Abaqus?
I have a .stl file of a structure and I want to use this file to do a simulation in Abaqus. I need my part to be solid but I don't have any .stp or .iges file of the sructure. So, I imported my .stl ...
CommunityBot
- 1
0
votes
2
answers
56
views
Structural Question Regarding Moving a Post
We have a post in our living/dining room that is inconveniently placed that we would like to move a few feet. One structural engineer briefly glanced at it and said that we could move it, but I am ...
CommunityBot
- 1
0
votes
1
answer
43
views
In Column Bucking strength of 24' 3"x3" Hollow Aluminum Tube with .125" Wall thickness
I am designing a Gin Pole to lift a 500# load. The pole will be hollow Aluminum tube 24'x3"x3" and .125" wall thickness pinned at both ends. The pole will be at a 45 degree with the ...
CommunityBot
- 1
3
votes
4
answers
241
views
Bending moment calculation
Considering all the variables are the same, how to rank these connections from highest to lowest bending moment?
CommunityBot
- 1
1
vote
1
answer
46
views
Will my brick veneer wall sustain the additional load of natural thin veneer stone, wire mesh, and plaster placed on top?
I have a (full, not thin) brick veneer wall on the front of my house. It is tied into the plywood (covered with paper) via wall ties and screws. I am wondering if I can apply plaster and wire mesh as ...
CommunityBot
- 1
1
vote
4
answers
239
views
Calculating the reactions and using method of joints
Determine the vertical displacement of joint C of the steel truss. The cross-sectional area of each member is A = 400 mm2 and Est = 200 GPa.
I think I know how to calculate the displacement using the ...
CommunityBot
- 1
0
votes
1
answer
47
views
Units of measurement for structural analysis
FEA engine
I'm using CCX finite elements analysis engine along with its pre- and post-processor CGX:
http://www.dhondt.de/index.html
https://github.com/calculix
Example
I'm looking at one example here ...
- 24k
1
vote
1
answer
878
views
Distribution of Forces into 3D Bolt Group
I'm trying to create an Excel spreadsheet that takes a 3D bolt group with x y and z coordinates, applied loading, and determines the distribution of forces into each bolt based on weighting by the ...
CommunityBot
- 1
0
votes
2
answers
110
views
Stress and Displacement of Cantilever Plate with a Uniform Load
Does any one happen to know of any resources that describe the stress and displacement of a uniformly distributed load in the direction perpendicular to the length direction of a plate analytically? I ...
CommunityBot
- 1
0
votes
0
answers
17
views
How to determine the flexibility coefficent of this six member truss using the unit-load method?
I'm studying the Flexibility method described in the book "Matrix analysis of framed structures" by James M. Gere but I'm having a hard time understanding one of the examples. I'm stuck at ...
- 15
0
votes
3
answers
203
views
Best support for a granite table top?: Flat bar 316L Stainless Steel or equal box section or unequal box section
Project is outdoor granite topped table. Table legs are two isosceles trapezoids crossed together at 90 degrees, with the legs having an internal angle of 80 degrees, made from 100 x 100 x 4mm 316L ...
CommunityBot
- 1
0
votes
1
answer
34
views
Analysis of a Beam under Non-static Case
I am interested in the distribution of the beam in nonstatic cases.
Typically we discuss the stress, and moment distribution when a beam is in a static case.
However, I am interested in this ...
CommunityBot
- 1
0
votes
1
answer
46
views
How much force is acting on the screws I used?
Years ago I built a vertical rack to store long lengths of wood. The rack was built using 2x4" pine scrap. Imagine a typical wall assembly with a single top and bottom "plate" (2x4) ...
CommunityBot
- 1
0
votes
0
answers
20
views
Designing a footing to accommodate changing applied moment under ULS constraints
I am currently working on a system that will calculate the reaction distribution $p(x)$ across a footing with an applied load $P$ and applied moment $M$. There is one case that has me stumped: when ...
0
votes
0
answers
43
views
Finding the bending moment diagram for an indeterminate continuous beam
In a recent lecture, we had the following example of an indeterminate continuous beam where we must find the redundant support reaction at $A$:
This was found by removing the support at $A$, and then ...
- 328