# 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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### 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, ...
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 ...
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 ...
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
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 ...
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 ...
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 ...
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 ...
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?
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/...
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 ...
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 ...
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 ...
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 ...
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" ...
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 ...
5k views

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
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?
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 ...
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
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
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,...
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). ...
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 ...
194 views

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 ...
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. ...
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