Questions tagged [structural-engineering]

Questions related to the integrity, design requirements, or analysis of structures.

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How to calculate the height of the supporting structure of an arch and the thickness of an arch in relation to its span

Please refer to the attached image. We know that if an arch is X unit wide then the supporting walls should not be less than X/4 unit width for the structural stability. I would like to understand ...
Sarbbottam's user avatar
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Find stresses involved and calculate magnitudes

I am new to mechanical design.What all forces and moments act on the hinge plate in following figure?How to find magnitude of stresses induced on the supports? Note: The spring is an expansion spring ...
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Free body diagram problem: Linkage w/ magnets and friction hinge

I am a bit stumped on a IRL problem, which i simplified in the diagram below: There are left and right beams (gray) linked together by a friction hinge. The bottom beam (black) is connected to the ...
Philip C's user avatar
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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 ...
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Buckling length of continuous steel H columns in multi story buildings

I have seen that steel columns in multiple story buildings span multiple stories, in that case how do you calculate the buckling length for the column? do you take the whole column's height, or just ...
Yafet Bouchagra's user avatar
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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 ...
moong's user avatar
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Could a miniaturised, lightweight Direct Air Capture (DAC) capability for CO2 be incorporated into industrial air conditioning units?

Rather than focus on the daunting task of upscaling demonstration plants on the lines of Climeworks to the extent necessary to remove the gigatonnes of CO2 scientists deem necessary should we not ...
Edward Hogan's user avatar
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1976 Baltimore bridge collision with cargo ship

Of course no bridge would survive impact with a very heavy tonnage vessel moving horizontally and knocking out support piers as the bridge structural design is based on vertical gravity dead load / ...
Narasimham's user avatar
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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 ...
Flash_Steel's user avatar
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How does a church built from stones survive 70 years under water?

Following the recent news about the Sau reservoir in Spain, the draught revealed an 11-century stone church which has been under water for 70 years since 1962 when the reservoir was built. How is it ...
Honza Zidek's user avatar
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Combined shear stress due to shear force and torsion

Let's assume I have a rotating shaft supported with bearings at both ends. This shaft is exposed to a point load (by means of another bearing) at some point and a torque. I want to calculate shear ...
Enes's user avatar
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DLC wear resistance

I read that a thickness of one micrometer of DLC coating (which, if I understood correctly, shows similar properties to diamond), increases the lifespan of an item plated with it from a week to more ...
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I'm Missing Something on Problem 3 in Section A5.4 of Bruhn's Analysis and Design of Airplane Structures

I've been working through the 1943 edition of Bruhn's Analysis and Design of Airplane Structures. I found an archive.org pdf version of the 1948 edition that includes answers to select problems, as ...
brandonman's user avatar
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$𝛕_{xz}$ in the flanges of T and I Sections

When we have a T or I section under a shear force $V_y$ I usually must account for a horizontal shear force across the section's Z axis ($𝛕_{xz}$). I understand why a transverse shearing force would ...
PeterRiceGOAT's user avatar
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What does "dc" stand for in this Positive Bending Moment for Plastic resistance of a composite concrete slab formula?

I'm designing a building with a composite slab with profile sheeting and steel structure, while trying to test the resistance of the composite slab in "composite phase" to bending moment I ...
Yafet Bouchagra's user avatar
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Is it OK to separate fire and structural analyses when analyzing a fire induced building collapse?

This is from NIST NCSTAR 1-6 It seems to me there are problems with this approach. The heat distribution depends on fire spread and ventilation paths, which in turn depend on the shape of tjr ...
Abdullah is not an Amalekite's user avatar
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Conflicting steel strength Vs temperature graphs, NIST NCSTAR vs Engineering Toolbox

This graph is from NIST NCSTAR 1-6C And this graph is from the Engineering Toolbox. As you can see, neither the NIST yield or tensile curves match with the ET structural steel curve. Why? And which ...
Abdullah is not an Amalekite's user avatar
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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. ...
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What is the shear force at point B? Is it +P or -P or zero? I am not able to find any source that gives the right information

I am not able to understand here that what should be the value of Shear force at point B. It seems to be a discontinous point, as there is point load there, but can we say about the exact value of ...
Suryakant Thakur's user avatar
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Counterweight requirement and platform design for motorised speaker stand stability

I recently bought my dream speakers (Dutch & Dutch 8c), but at the cost of having to preserve a minimalist interior for the sake of household peace. To that effect, I plan to construct motorised ...
talalalal's user avatar
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Ando dots or holes in concrete walls

I am making a concrete poured wall with holes where the bars to support the wood frame remain. Question is with plywood supporting frame what is the greatest distance between bars that will still ...
Wayne Silverstein's user avatar
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Does the magnitude or range of interaction of a force affect which layer dominates the mechanical response of a multilayered structure?

Suppose I have a two-layered material, with a stiff and thin outer layer (high E) and a soft (low E) and thick inner layer. Intuitively, it feels like the effect of short-ranged forces (e.g., van der ...
SNIreaPER's user avatar
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How is the number of memebers in a truss calculated?

In a fully connected truss (each node connected to all other nodes), the number of members (bars) is equal to $n(n−1)/2$ where $n$ is the number of nodes. I don't understand the derivation of this ...
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Contradiction in Convolution Solution

In this question, I solved the convolution for triangular pulse and the solution was Now take k = 1, m = 1 , And as R = Ku/P0, R = So, for t<td u(t) is a function of t and for t>td its a ...
Eshita Phatangare's user avatar
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Some questions about linear rail systems

there are many linear rail system configurations. Some with only one lead/ball screw in the middle and a moving platform with wheels aligning outside/inside/on top of one/two framing rail(s). Others ...
lovedrinking's user avatar
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How much of a QR code needs to be covered to be unreadable?

How much of a QR code has to be physically covered up to not be readable by a scanner? I'm aware that QR code has max. 30% error correction, so 30% minimum coverage should do it? It also has 3 ...
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Calculating the maximum force on a large cantilevered round steel bar that is used to support a tree house

Hi all and thanks for this page. I have constructed a large treehouse across two trees. The main support is provided by passing a very large 57mm dia high tensile steel bolt through each tree. Each ...
D McC's user avatar
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How do I find the pitch for the fly press?

To solve the problem first I need to find the pitch of the screw to find the shearing stress, is the stroke 45 degrees per 5.75mm or 90 degrees per 5.75 mm?
Youssef Mohamed's user avatar
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Is overpressure really an appropriate criteria for blast damage?

So, I went on Nukemap, and they gave me the following values for blast effects. 1 psi (7 kPa): windows break 5 psi (34 kPa): most residential buildings collapse These numbers are way too high. 1 psi ...
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How did gothic church architects/builders properly scale up their models to full size churches?

In this video the author explains how ancient church builders used models to determine the proper shape and order of installation of architectural elements in gothic churches. From the little I know, ...
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Are there structural (or code) reasons for choosing longer or shorter beam spans (besides bending moments, and ignoring cosmetics)?

When selecting the length of beams for a bridge, the better approach is to choose multiple full-length beams. Unless there is a compelling reason, one would not choose multiple shorter spans. An ...
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Can someone help explain the difference between strength and stiffness?

I just can't seem to get it through my head and I don't understand the difference. As far as I can understand, strength is a materials resistance to permanent fracture while stiffness would be ...
JohnBremer300's user avatar
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Belt conveyor roller spring

I wanted to know if anyone could help in this area. I want to create an inclined conveyor belt where, when a cargo box reaches the top of the conveyor belt, the rollers sequentially move down (maybe ...
ramine khadem's user avatar
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Mass Brick Settling Causing Excess Load On Center Beam

I live in a 115+ YO building and recently had my kitchen remodelled. During this the subfloor was replaced (old 1x6s in bad shape). I noticed a significant bow in the joists with the central steel ...
Michael33's user avatar
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what are the compression forces in a strut if the strut is fixed

i am trying to match an experiment i have done and i dont know how to compute the force in the strut in terms of F given these boundary conditions. i have attempted to use fixed end moment equations ...
user45419's user avatar
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Setting direction vectors for Lines in ANSYS APDL

I am using beam elements to mesh lines with "pre-meshed" shell areas. Problem is that the ANSYS sets Line Direction vectors on its own. This results in Cross sections assignment flipped from ...
Rehan Khan's user avatar
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Antenna Design Problem

I'm designing a 10'L x 10'W x 200'H end fed with a capacitance hat, that extends 4' out. The base will be chain cradle support. Here's what it might mean. The base of the tower is 1' off the ground. ...
Ben Madison's user avatar
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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 ...
Anh Vu Nguyen's user avatar
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Strength of aluminium plate

I need to make a new outboard engine mounting plate, as I have just purchased and larger HP engine. My current plate is made of 12mm thick aluminium plate. I am having problems buying a cut to size ...
Doops's user avatar
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Input of dynamic load in SAP 2000

I wish to know how dynamic load that is specified in an external file (load vs time) can be applied to a structure modelled in SAP 2000
user29793's user avatar
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Question in Reinforced Design Course - One Way Slab ACI code

Establish the thickness of the floor slab shown of figure below (for section 2B1- 2B2-2B1) for a service live load of 4.8 kN/m2 . Use f'c = 25 MPa, fy = 400 MPa, and ACI code. Show all your step-by-...
Mohammed ALabdrabalnbi's user avatar
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Shear Force in Inclined Beam

Suppose I have an inclined beam with a UDL applied vertically downwards, will the shear force act normal to the beam, or vertically?
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Please see image and calculate for combined stress and deformation

This image is from an assignment I am struggling with this question. help would be much appreciated The cross section of the I-beams truss structure is 0.0031771m². The forces from left to right are, ...
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2D frame analysis by open-source Lua code

There are great apps for 2D frame analysis like the one mentioned here: https://engineering.stackexchange.com/a/50967/15178 I'm just wondering if anyone knows an open-source Lua code for 2D frame ...
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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,...
CrazyFox01's user avatar
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Does yield point of steel depend on thickness?

I have two different plates of different thickness and I need to calculate yield point. Does yield point of steel plate changes with changing of plate thickness?
Akshay Wagdole's user avatar
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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" ...
TheSpareBoot's user avatar
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Why does/doesn't this structure qualify as a truss/frame?

I am learning about the basics of truss analysis in mechanics. As part of this, I learnt that a truss/frame is composed of at least 3 members, its joints are pinned and that any loading is applied at ...
Guest3301's user avatar
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Using a stainless steel 304 flat plate 1x1/8"as a crossbar - Weight capacity

I am building a vehicle roof platform. The roof has 2 40mm T slot bars running along the length spaced 48" apart. They can handle static load of 700lbs I am wondering what is the max safe load ...
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Rigid frame deflection and material selection

I'm building a frame that will receive a point load mid span (likely it won't be but want to design for worse case). The frame is 1.5 x 0.095 square tubing, and it will be skinned with 14ga on one ...
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