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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.

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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 ...
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3 answers
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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 ...
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2 answers
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Iterative Method through FEM

Due to reasons, I can not fully describe the process explicitly so I will be using substitutes to represent the variables. Nomenclature: x - an independent variable y - another independent variable Fz ...
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When something undergoes angular acceleration (like a bar) how does the distribution of forces look along the bar?

This is something kind of explained with propellers and turbine blades but I'd love some good explanations. Thank you!
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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 ...
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Torsion - Circular vs Non-circular shafts

The book I'm referring to says that a shaft with a circular cross-section in pure torsion will have its cross-sections flat during the loading. The cross sections won't deform; they will rotate. It ...
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1 answer
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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) ...
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Design forces for a home built trailer structure (tiny home or camper)?

I am going to purchase a steel trailer frame, and then I want to build a camper on top of that. This will be full height teardrop which is likely wood framed but I am also considering aluminum framing....
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Force Required To Stop A Freely Rotating Wheel With Attached Falling Object With A Spring

I have a wheel with a diameter of 2m and a weight of 67kg. The wheel has a radius of gyration of 0.82m. From this wheel a weight of 35kg is suspended. The weight will fall for 10m and accelerate the ...
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Wind Pressure on Chimney

I have this question that I am trying to solve. I will explain problem as best as I can. A brick chimney has parallel sides and a height of 18m. It has a square sectional plan with dimensions of 2....
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1 answer
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How can I find Spectral Acceleration (Sa(T1; 5%))?

I want to do incremental dynamic analysis (IDA) for my project, and for the hunt and fill algorithm, I need the 5% damped Spectral Acceleration at the structure’s first-mode period (Sa(T1; 5%)). Can I ...
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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) ...
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Need to find beam deflection of a steel tube

So I have a square tube of 40mm, 3mm wall thickness with a length of 1 meter. Both ends are fixed 25mm inwards. Load is 3kg centerpoint. Steel is SJ235. I need to know the deflection of this beam. ...
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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). ...
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Names for 3d tensile structure

A naive natural language description might be 'pole supported by tent-like 3d wire net' for the depicted playground climbing arrangement made of rope with a pole in the center. Is there a more precise ...
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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, ...
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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 ...
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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 ...
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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: ...
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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 ...
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1 answer
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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 ...
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1 answer
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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 ...
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2 answers
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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?
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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/...
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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 ...
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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 ...
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1 answer
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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 ...
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1 answer
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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" ...
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1 answer
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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 ...
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3 answers
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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 ...
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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?
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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 ...
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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 ...
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1 answer
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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
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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,...
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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 ...
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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 = \...
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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 ...
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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 ...
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1 answer
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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 ...
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2 answers
482 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?
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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/...
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2 answers
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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 ...
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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 ...
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4 answers
378 views

Bending moment calculation

Considering all the variables are the same, how to rank these connections from highest to lowest bending moment?
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...

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