ENGINEERING.com Civil/Structural Engineering

Bending moments of a beam

Tom Mercer — Fri, 17 May 2013 21:17:47 GMT

A beam 10m long is suspended by two lifting points 2m from each end. I need to calculate the bending moment at the lifting points?
It has a UDL of 12kN/m and a self weight of 4kN/m.
Can some help with this and also describe the free body diagram?
Thanks

Online Civil Engineering Calculator

skahmad — Sat, 06 Apr 2013 07:18:36 GMT

Civil Engineering Calculator with many useful tools for analysis and design is available at http://civilengineer.webinfolist.com/cecalc.htm
This free all-in-one package is including Bending moment, shear force, slope & deflection, moment of inertia, Moment distribution, fixed beam, continuous beam, overhanging beam, reinforced concrete beam etc.

required levee top width calculator

jloup123 — Mon, 04 Mar 2013 06:01:59 GMT

In need of a quick calculator/spreadsheet for required levee top width to satisfy subdivision reviewer.
a simplified, dumbed down version would be perfect. this is not for the Mississippi River but for a very small berm that will seperate a rear lot ditch from an adjacent property.
The berm is 1 ft tall with 3:1 side slopes. I need to provide a calc to justify req'd top width today.

Ran a couple of non-productive google searches..
Thanks for any assistance, links or attachments that you can provide.

spontaneous pressure release and flow

nelsaolson — Sat, 02 Mar 2013 04:23:46 GMT

I have a 25 liter vessel with a 1" outlet and two 1/32" outlets. The gas formed upon combustion has a density of approximately 2.9 g/Liter at a temperature of 383 K and 3.2 Atmospheres pressure. If the pressure occurs spontaniously via internal combustion inside the vessel, how much of the gas goes out through the 1" outlet and how much through the 1/32" outlets in grams per second as the pressure falls from 3.2 Atmospheres to Atmosphereic pressure? Cp/Cv = gamma = 1.32 the viscosity of the gas at 1.013 bar and 0 °C is 0.00008 Poise; the Compressibility Factor (Z) at 1.013 bar and 15 °C is 0.9775. The Thermal conductivity at 1.013 bar and 0 °C is 13.99 mW/(m.K).

Calculation of Area Moment of Inertia and other geometrical properties of section

skahmad — Fri, 01 Feb 2013 00:10:47 GMT

Excellent online calculator for geometrical properties of sections is available at
http://civilengineer.webinfolist.com/str/micalc.htm
This is very useful to calculate centroid, area, moment of inertia, section modulus, radius of gyration etc. for plane sections either single of built-up

Calculator for deflection and slope of beams

skahmad — Tue, 11 Sep 2012 09:27:31 GMT

You can use online calculator for deflection and slope of beams
at http://civilengineer.webinfolist.com/str/sdcalc.htm

Moment Distribution Calculator

skahmad — Thu, 30 Aug 2012 00:54:40 GMT

Moment distribution calculator for solving indeterminate beams is now available at http://civilengineer.webinfolist.com/mdcalc.htm

civil engg

nilksam — Mon, 20 Aug 2012 10:33:01 GMT

I am a 2nd year student of civil engineering. I will finish my bachelor degree in next 2 years. I want to know can i do Master of Science in Mechanical Engineering. If possible,in which fileld i should do?

deflection on RC plane

Charles — Mon, 23 Jul 2012 06:50:24 GMT

6500mmx12000x1000mm thick reinforced concrete plinth with embedded I beam x2 supported by piles(875mm apart) beneath plinth; plinth is 20mm seal joint apart with surrounding area. area surround where I beam254x254x73kg/mUC deflection inside plinth=deflection also outside plinth AROUND the 20mm seal joint =5 arc second, why?what are the possibilities? Other places INSIDE plinth, deflection=0 or 1arc second ??; loading =20-30 tonne. Outside plinth less piles density.
Loading along I beam axis. How to prevent deflection? measurement taken from niveltronic 0.01mm/m, Can licensed surveyor confirm this? What are the possible solutions? aren't all readings the same?why is there variation on the same plane( plinth)???

Relationship between funicular polygon and bending moment diagram

MelissaPudding — Wed, 25 Apr 2012 20:12:29 GMT

Hello,
I'm a civil engineering student. I found this forum when trying to find some information about the relationship between funicular polygon and bending moment. I don't know if I'm allowed to ask academic questions here...
Well, I'm trying my luck ;p

I learned how to contruct a funicular polygon and bending moment diagrams in two different subjects and I realised how close looking the two are, so I wondered if there was a good explanation to relate the two.

I can feel it's kind of the same as the polygon represents the forces in order for the structure to be in equilibrum and the bending diagram represents how the structure bend in order to stay in equilibrum (is that right ?)

Someone also told me yesterday that the slope of the funicular polygon has something to do with the shear force. I think it's because of the fact that the derivative of the bending moment is the shear force but I'm not sure why.

Thank you in advance for your help and sorry for my bad english.

Bending Moment Calculator online

skahmad — Tue, 19 Jun 2012 11:08:25 GMT

Excellent bending moment calculator is available at http://civilengineer.webinfolist.com/mech/bmcalc.htm
to easily calculate shear force and bending moment due to different types of loading

joint strength

engrkabir08 — Fri, 15 Jun 2012 05:54:32 GMT

I'm writing from Bangladesh, in my country people constructed their building using two types of concrete at the same structure. They casted column with normal weight concrete (using stone chips fc' = 4000 psi) and beams & slab with light weight concrete (using brick chips fc' = 2500 psi)to minimize construction cost. My question is, what about the beam-column joint strngth.If the beam-column joint acts as a part of the column, then can it servibe or not as it is casted with a concrete with fc' = 2500 psi but the column was designed with a load capacity fc' = 4000 psi.

Response Modification Coefficient R

IvanK — Tue, 22 May 2012 10:15:07 GMT

What is the Response Modification Coefficient R for wood structures that are diagonally braced with wood members (building on columns like braced deck structure - not cantilevered columns- just x-braced)? Nothing from ASCE 7-05 fits to this common framing practice

NV65 Wind speed

stp_nwc — Sat, 19 May 2012 07:09:23 GMT

Could anybody can tell me please? that
1. Basic pressure velocity of french standard NV65 is determine by
q = V^2/1.63
where q = velocity pressure (N/m^2)
V = Basic wind speed (m/s) @ 10m above ground

2 How this code NV65 measure the wind speed? eg. 3s-gust, fastest mile, or 10min-avg, 10min hour

Thank you

Substituting 8.625 OD pipe for x IBeam, possible?

PhilWebb — Tue, 24 Apr 2012 10:36:20 GMT

Building a Batting cage for my sons and one system calls for 4 corners of 8.625 x 1/4(?) structural steel pipe with 3/16th cables strung between these corners to hang the netting. Foot print is 72'x14' rectangle.

I was curious if IBeams could be used instead of the pipe and if so, how would I determine the size?

The pipe will be vertical and is planted 4.5 ft into concrete and sticks out of the ground 11.5 ft

I'm looking to save money on purchasing these pipes if possible by using Ibeam.
Is there info on "deflection" for this pipe to see what would be adequate with Ibeam to see if it even would be possible to save money?
If this is not the correct place to ask this question please let me know.
Thanks

Basement egress window lintel

jcdarrin — Fri, 13 Apr 2012 08:43:57 GMT

I am putting an egress window in a below-grade basement with an 8" poured foundation. Do I need to cut the foundation to the top and add a lintel, or will a 10" deep section of the foundation concrete be sufficient as the support above the window? It is a load-bearing wall, and I expect there is re-bar, but I don't know.

lightening holes

wayne@nb — Wed, 28 Mar 2012 11:26:04 GMT

How much will 3/4 " holes on 2" centres drilled in all sides of 2" square tube(.120 wall) reduce the strength of said tube.

pile and pier foundation.

coselinn — Fri, 23 Mar 2012 19:55:39 GMT

Hi,everybody.I am a civil engineering student.I am now studying about the pile and pier foundations at the class.As my country haven't developed in education,I studied about these foundations only in the book.I haven't done in practice.So,please explain me more about these footings and show me with the pictures if you can.Thank you!!!

Concrete Header in section question

amit10980 — Mon, 06 Feb 2012 09:40:00 GMT

I've taken out a concrete patio that didn't fully cover the floor joists.

I'm going to pour a concrete header as a water barrier and as a termite barrier. Of course a new patio could poured against the header at a later time.

The concrete header will be about 4" thick and about 16" high and working up from what might be called the brick ledge. I would like to pour the concrete header in four sections and so I am thinking about 1/8" thick 316 stainless steel plates perpendicular
into the header to make the sections.

Would the plates be better longitudinally into the header making a concrete seam (of new pour against prevous pour) or
perpendicular into the header with the plate as the seam ?

Software for topology optimization of trusses

zoranbd — Tue, 31 Jan 2012 07:41:53 GMT

Hi.
Are there any software packages available that can do topology optimization of truss structures?
Thank You.