Skip to main content

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
0 votes
1 answer
45 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, ...
0 votes
1 answer
304 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 ...
0 votes
2 answers
64 views

Finding zero-force members of truss system

My instructor gave the below example for identifying zero force members in truss. The members marked with the green zeros are the zero-force members, according to his solutions. I cannot understand ...
0 votes
2 answers
169 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: ...
1 vote
4 answers
2k 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 ...
0 votes
1 answer
55 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 ...
0 votes
1 answer
76 views

How would I do stress analysis on a fuselage like this?

This is a frame for an RC plane that I have designed using balsa wood and prefabricated carbon fiber flat bars. It will have a balsa wood skin on the outside, but I have yet to figure out how to ...
0 votes
3 answers
53 views

Is there any standard procedure or guideline to solve complex asymmetrical trusses such as saw tooth type of truss used for polyhouse construction?

I want to solve for the dead load,live load as well as wind load for a saw tooth type of truss, which is asymmetrical in nature....generally used for the construction of greenhouse. I also want to ...
-1 votes
2 answers
7k views

How to derive fixed-end moment of a beam?

Here is my attempt but I am not getting the right answer. Can someone tell me what I am doing wrong?
0 votes
1 answer
59 views

Calculation of Drone Fuselage Natural Frequencies

I'm looking to do a frequency analysis of a fixed-wing drone. The goal is to calculate the first few natural frequencies of the fuselage to verify there is no resonance with the wing structural/...
0 votes
2 answers
2k views

Deflection Equation of a Stepped Beam

Help out a college student. How do you derive the deflection equation y(x) of the shown stepped cantilever beam in the figure? Each segment has a unique Young's modulus and moment of inertia. The ...
0 votes
0 answers
35 views

How to calculate the material and thickness I need for a certain force on it?

I am trying to figure out how to design how thick a material has to be so that the bar shown in picture 1 stays intact when a user is running on it. Background: The project is a treadmill and the user ...
0 votes
1 answer
49 views

Wind Pressure on Chimney

I have this question that I am trying to solve. I cannot put diagram up to show problem because it is over file size limit of 2 MegaBytes, but I will explain problem as best as I can. A brick chimney ...
0 votes
1 answer
41 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 ...
0 votes
1 answer
164 views

Calculating the plastic section modulus, Z, of an arc of a circle

I am trying to find a simplified formula for determining the plastic section modulus, Z, of an arc of a circle. In my case, I have a 20" diameter 0.375" thick pipe and I am cutting a 6" ...
0 votes
1 answer
373 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 ...
3 votes
4 answers
5k views

Is it possible to convert uniform loads to point loads?

I want to perform a structural analysis on a portal frame using a finite element solver to get a displacements and reactions for a load. The software library only accepts loads applied to node, not to ...
1 vote
1 answer
251 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?
0 votes
1 answer
73 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 ...
0 votes
1 answer
150 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 ...
1 vote
1 answer
51 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 ...
1 vote
1 answer
49 views

Pumping water from under concrete slab basement

I have this situation, and wanted someone's opinion. Info: Concrete foundation basement, slab floor Weeping tiles and a sump pump is present / operational The house is near a pond. Grading is alright,...
0 votes
3 answers
167 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). ...
0 votes
0 answers
19 views

Case studies in Carbon Fiber composite tubes to verify FEA

Whenever I build a model of something new, I like to have some analytical results that I can compare with my model so I can reassure myself the model is correct. I have some resources that show me ...
0 votes
1 answer
194 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 = \...
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 ...
0 votes
1 answer
32 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 ...
0 votes
1 answer
57 views

Beam deflection for FEA model validation

I'm trying to validate an FE model that I'm using by comparing to a simplified analytical solution to the problem. The part I'm analyzing is a lug that is constrained on one end and has a point load ...
0 votes
2 answers
465 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?
0 votes
1 answer
247 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/...
1 vote
2 answers
146 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 ...
0 votes
1 answer
37 views

Why do we include the fixed-end moment when calculating the bending moment at another point on the beam?

When we calculate the bending moment in a beam with a fixed end using the the method of cuts (determining the moment at a point $x$ by making a cut at that point in the beam) we usually include the ...
2 votes
4 answers
371 views

Bending moment calculation

Considering all the variables are the same, how to rank these connections from highest to lowest bending moment?
0 votes
1 answer
102 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 ...
0 votes
3 answers
86 views

Economical difference with high-pressure vessel design pressures for fixed volume

Suppose space is not an issue and I need a fixed volume of compressed air (for storage), say 1m³. Is it more economical to manufacture a thick-walled vessel but with a smaller volume or a thin-walled ...
0 votes
0 answers
17 views

I have a question about INISTATE Code (Analyzing a curved plate)

I'm studying welding-induced residual stresses for curved steel plates. So, I need to use the INISTATE code taking initial stresses. This is the picture that I want to analyze. I divided a curved ...
0 votes
1 answer
61 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 ...
0 votes
1 answer
28 views

Unexpected inconsistency in modelling of load propagation in Icosahedron struts

My intent is to build a program dedicated to analysis of geodesic structures. My proof-of-concept spreadsheet is intended to help me clarify the interactions at each node, so that when I approach the ...
0 votes
1 answer
496 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?
1 vote
2 answers
61 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 ...
0 votes
1 answer
187 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 ...
0 votes
0 answers
15 views

Analyzing shear stress of plate

I would like to conduct a nonlinear analysis to obtain the stress-strain curve of a plate subjected to shear force, as depicted in the figure below. However, I am encountering difficulties in setting ...
0 votes
1 answer
50 views

Analysing Bending in a Linkage Member

Context: I'm designing a linkage mechanism as part of a university robotics design project. From previous analysis, I have determined the forces and torques applied to each member at all points in ...
1 vote
3 answers
623 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 ...
1 vote
2 answers
34 views

Structure's equlibrium state

The state problem of a structure at equilibrium is generally expressed as: $K(x) ~u = F(x)$ where $K$ is the stiffness matrix, $u$ is the displacement vector, $F$ is the force vector, and $x$ is the ...
0 votes
0 answers
51 views

How accurate is axisymmetric beam theory for modeling plate bending?

I often have to do a quick estimate of circular plate deflection and max stress under simple loading scenarios – uniform distributed pressure, central point load, line load, distributed annular ...
-1 votes
1 answer
26 views

Find the internal bending moment, Mc

A 7meter,m, long cantilever beam whose weight per meter is 19Newton, N, carries a load that varies uniformly from 43N/m, (Newton/meter), at the inbuilt side, point A, to 0 at the free end, point B. ...
0 votes
2 answers
11k views

What is a Velocity, Pseudovelocity, Acceleration, Pseudoacceleration response spectrum?

I would like to know what is a velocity response spectrum, PseduoVelocity Response spectrum, and how they are different from one another? Could you also do the same for acceleration and ...
1 vote
2 answers
110 views

Determining the suitability of a timber joint in a given situation

There seems to be a lot of information around calculating the forces exerted on a structure. When joining wood, once the structural analysis is done, how is the performance limit of a certain type of ...
0 votes
3 answers
2k 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 ...

1
2 3 4 5
12