CE Board Exam Review: The Conjugate Beam - Best Beam Deflection Method?

[@sofiaabegalealabado7090]

ang aesthetic ng viddd ang ganda panoorin!!

[@civl112]

Can you do a more complicated example and show that this is still better than direct integration

[@johnpauloreyes596]

During my board exam review last year favorite ko talaga tong deflection method na to...

[@ralphanthonymallillin2712]

Madami po ba ganyan lumabas deflection sa board exam?

[@johnpauloreyes596]

Nung time ko parang wala? , Sa board exam naman wala namang snasabi kung anong method gagamitin, kung saan ka lang comfortable at kung ano master mo yun gamitin mo.

[@ralphanthonymallillin2712]

@@johnpauloreyes596 i mean po ung deflection po sir haha..mag tatake pa kc ako ng board haha..bago graduate pko

[@johnpauloreyes596]

Sa time kasi namin alam ko wala e, karamihan design

[@ramilalinjr.5421]

@@johnpauloreyes596 ano po yung design sir? 3rd year here and di pa namin nadaanan yang design.

[@hiel2290]

Kippap Education: I solved it again and got 10.99 mm deflection. Double check mo if you got: Reaction ng beam: 22.5 upwards at point A 20 upwards at point B Areas ng MDP Triangles: 101.25, 90, -22.5 Spandrel: -16.875 Reaction ng conjugate beam: 77.625 downwards at point A Moment at point D: 142.875 Question: Sir, base po sa computation ninyo how did you solve the spandrel po? Kasi iba po yung na compute ko, which is 1/4(3)(-15)=-11.25 base po sa formula ng area ng 3rd degree spandrel.

[@KippapEducation]

Ang height ng spandrel is not -15. You can get that using the final value ng isang triangular load (-wL^2/6) = -22.5

[@hiel2290]

Thank you po. Na solve ko na rin yung problem. 👍👍

[@baynosjerrymiaf.4607]

paano po nakuha ang 77.625? I got 82.6875 po sa Reaction at point A

[@jeromecagnayo8353]

Nice video sir! Sa tingin ko lang po sir mas madali si 3ME sa problem na yan hehe.. kung master lang mga 3 moment factors sktch lang ng horizontal line from the point of interest sa elastic curve parallel sa original beam then mapapansin na equal si h_A and h_B then kunin lang yung moment sa point na yun then equate haha 😀 pero may mga case na madali, meron rin matagal haha decide nalang kung ano mas less time consuming 😁

[@KippapEducation]

Jerz ;3 sige try ko rin isolve gamit 3ME haha let’s see kung ano mas madali :))

[@markrius_]

Thank You po, its help me a lot lalo pa’t online class kami. 🙌🏻

[@shunkreuz5485]

BRO CAN WE HELP EACH OTHER ADD ME ON FB SWEDEN BILOLO ALVAREZ

[@jaeronabug9923]

Thank you po, nakakapgreview kahit nanonood lang hehe

[@KippapEducation]

Jaeron Abug hahaha welcome! Good luck if magboboards ka man hahaha

[@jaeronabug9923]

@@KippapEducation yes po, kung di po sana dahil sa covid Grad na po ng June and review po for nov. 2020, Thank you at napansin nyo hehehe

[@noehareta1424]

Very helpful po. Thank u God bless🤗

[@airamaybantugan4960]

Hello po, bakit positive moment po yung 18KN.m? Possible answer po ba ay dahil nasa right side ng fixed support at positive effect yung moment sa beam?

[@christianlouieursua2967]

Kasi yung effect po ng moment sa beam ay concave upward or naka smile

[@airamaybantugan4960]

ahh, okay po. thankss po

[@countonme-cetutorial5802]

Ang galing niyo po Engr!

[@KippapEducation]

Eduard Joseph Dela Cruz thank you :))

[@leoleo8061]

sir bakit po positive yung moment nyo na 18 kahit counterclockwise

[@KippapEducation]

Counterclockwise moment is positive

[@leoleo8061]

@@KippapEducation ok but its more about the bending of the beam than the rotation right

[@KippapEducation]

Leo Leo sa case na ito kasi the counterclockwise moment is at the right of the reference section. And may mga sign conventions yan kung positive ba or negative ang moment diagram by parts niya. Counterclockwise moments located at the right of the reference section is positive. You can confirm my answer by watching my 3 moment equation and AMM video, all of them gave the same answer as this one.

[@joshuadavidromero2623]

@@KippapEducation so pagdating ba sa left side, clockwise naman ang positive?

[@KippapEducation]

@@joshuadavidromero2623 yup baliktad naman siya

[@kayeabaygar5370]

THANK YOU SIR...very helpful po talaga..

[@sherylbua946]

bat sa transformed beam mo sa left side roller wala ka nilagay reactions sa right side lang yung 154

[@KippapEducation]

May reaction din ang roller. I didn’t write it lang kasi hindi siya kailangan to solve the problem kasi left side lang ang i-aanalyze

[@martinalessandroragasa1819]

Engr. thoughts on double integration method for beam deflection?

[@KippapEducation]

Easiest to learn pero pinakamatagal i-perform. Not recommended to be used sa board exam :)

[@RandomStories0218]

Sir pwede nyo ba isolve yan gamit ang DIM?

[@joshuamagno6575]

kung saan lang po ba hinahanap deflection dun po mag cut pwede po ba yun??? thanks po in advance

[@sherylbua946]

what if yung hinahanap na slope at deflection ay wala sa gitna at nasa pinaka dulo na point?? how to cut it and what moment areas are we going to use?? kase if sa point C like the example sa gitna ang cut what if the question is find the slope and deflection at point B

[@KippapEducation]

You can use any technique to get the shear and moment at any point in the transformed beam. Pwedeng equilibrium equations and not just cutting. Since simply supported ang beam and walang external moment sa support, zero ang deflection sa B. If shear naman, it’s just 154.72/EI

[@jasonnuval9717]

Thank you engineer! Paano or ano mas madaling gamitin pag deflection sa trusses? Thank you

[@KippapEducation]

I recommend virtual work method sa trusses haha

[@jasonnuval9717]

Thank you Engineer. Looking forward sa next upload! RC or Steel siguro hehe. God bless engineer!

[@appleaterrado5313]

may video po kayo ng superposition method?

[@ralphanthonymallillin2712]

Bakit po ndi niya na ginagawa ung oag multiply ng area sa rectangle or triangle dun sa Shear or Moment???

[@arieljudegarcia]

may mga kahinaan conjugate eh mas safe ako sa area moment. although sakin lang to depende din sa tao

[@KippapEducation]

Yup depende sa preference! Second favorite ko ang AMM though!

[@KippapEducation]

Pero for the sake of discussion, can you share kung anong nakita mong weakness ng conjugate?

[@orbital16]

Sir ask lang bale let say yung unit ba ng term na 198(4) is 198Kn.m^2(4m)? Bale ano po unit ng Rb..sorry😁

[@KippapEducation]

Ang units ng Rb ay kNm^3. If you divide it by EI (which has a unit of kNm^2), you would get a unit of m, which is the deflection of the beam at that point.

[@orbital16]

@@KippapEducation salamuch po..

[@orbital16]

@@KippapEducation sir tanong lang po ulit, nalilito po kasi ako sa consistency ng unit. At 8:40 V+48+72=154.72 Di po ba yung 48 at 72 has a unit of Kn.m^2 then yung 154.72 naman is Kn.m^3? Nacancel po ba yung m? Thanks po.

[@KippapEducation]

@@orbital16 wait correction sa inexplain ko haha ang MOMENT sa conjugate beam ang may unit na kNm^3. Ang shear sa conjugate beam has a unit of kNm^2. That's why pag dinivide mo yun ng EI, you would get a unitless quantity na slope.

[@orbital16]

@@KippapEducation Oks lang po haha. Bale po yung equation sa shear na V+48+72=154.72 Which is V=34.72. So yung 48 at 72, Kn.m^2 unit nila. Paano po yung Rb na 154.72 di po ba Kn.m^3 yun? Hahaha sorry po naguguluhan lang ako if paano mag-arrive sa Kn.m^2 since yung isa is Kn.m^3. Ganyan din sa book na gamit ko hahahaha

[@jesterclydedonato8950]

engr may i ask, dun po sa may moment sa conjugate beam diba sa rectangular load po is 72(4)(2+6) kasi yung distance ng rectangular hanggang dun sa A

[@KippapEducation]

72 is the area of the rectangle na. Ang expanded equation is 18(4)(2+6)

[@simplemathguy]

Yung sa direction ng slope po pano po yun? With respect to the horizontal po yan diba? Initial position to deflection position ba sir? Like if unform load sa simple beam, sa left part is clockwise and sa right ay counterclockwise?

[@orbital16]

Sir tanong lang po ulit🙈. Ano po yung formula sa pagkuha ng magnitude if yung spandrel is 2° due to rectangular load? I mean ano po yung equivalent ng -wL^2/6 kung yung spandrel is 2nd°..salamat

[@KippapEducation]

You can check sa 2:12. Ang formula is -wL^2/2

[@kalmado8149]

Dba 3rd degree gamit mo?

[@luisgabrielcabico9389]

Ano po ang prefer niyong method if maximum deflection po ang hinahanap?

[@rofl4597]

Paano po kung hindi constant yung moment of inertia? applicable pa rin po ba yung moment diagram by parts?

[@KippapEducation]

Hindi na siya applicable

[@darwinhowelldeguzman2571]

Hello po! Paano po mag-determine ng reference points?

[@KippapEducation]

Pwedeng kahit saan pero mas madali makakasolve if yung reference point ay nasa dulo ng distributed loads or yung highest point ng triangular load.

[@darwinhowelldeguzman2571]

​​@@KippapEducation thank you po sirr!

[@akprimo3452]

Sir asan po yung video nyo na area moment method hege

[@KippapEducation]

It’s here! kzbin.info/www/bejne/aGq6YmeumJyLlbM

[@akprimo3452]

Thank youuu sir ☺️☺️☺️☺️

[@jonathananniban6440]

Sir more examples Po sana about conjugate beam method

[@rainylee2627]

Sir tanong ko Lang po pano po ba makuha yung Rb na part, bakit po 198(4) and so on??? 🙏🙏🙏

[@KippapEducation]

It's Area*Moment arm. Compute muna ang area ng bawat shape then measure the distance of their centroid sa point A.

[@rainylee2627]

@@KippapEducation thank you po

[@jasperbilbao7105]

I can't solve the example you've given at the end of your video 😫

[@KippapEducation]

I solved it again and got 10.99 mm deflection. Double check mo if you got: Reaction ng beam: 22.5 upwards at point A 20 upwards at point B Areas ng MDP Triangles: 101.25, 90, -22.5 Spandrel: -16.875 Reaction ng conjugate beam: 77.625 downwards at point A Moment at point D: 142.875

[@jasperbilbao7105]

Thank you po

[@jasperbilbao7105]

Nakaradian mode ang calculator ko po kaya ang liliit nang mga answer. Thank you po. 🤗

[@ophighlightsx351]

@@KippapEducation Question po sir. what point po ginamit nyong reference point?

[@KippapEducation]

jerick econar point D

[@johnalexanderbello-mp4xi]

sir pwede po mas paexplain kung san nakuha mga minultiply sa value nung kinukuha yung reaction sa B

[@annepunzalan4652]

Sir tanong ko lang po. What if nataon sa reference point eh may moment po doon?

[@KippapEducation]

It will not be included (kasi walang length ang rectangle). Na-incorporate na ang effect ng moment sa reactions ng beam.

[@annepunzalan4652]

Thank you po☺️

[@theemotionalcanvas32]

Thanks Engr 😘

[@mixhaelcastro]

Bakit po 18 po ang height pero dun sa moment by parts negative na yung h?

[@meyaczarina9418]

hindi ko po makuha ang slope ng inyong exercise. 0.3049 degrees po nalabas sa akin

[@Engr2025]

sir,pano po pla na convert sa 25,000 KN.m2

[@KippapEducation]

E = 200GPa = 200,000,000 kPa I = 125,000,000 mm^4 = 0.000125 m^4 EI = 200,000,000 * 0.000125 = 25,000 kNm^2

[@Engr2025]

@@KippapEducation thank you sir, pwd po ba nexttime gawa ka rin video about force and flexibility method applying to indeterminate strutures : )

[@macapanasmapearlerica753]

Bakit po yung Rb naging -154.72 pano po sya kinuha plsss pasagot

[@junnotactaquin6572]

Crush ko na si Engineer hehehehe

[@bidongboding2890]

Hope to see example ng mga 3rd degree pataas indeterminate beams

[@PedroNoCealing]

English + no English = this video.

[@markfajardo3620]

master ask lang po ako question sorry po kung di related sa video. ask lang po sana ako kung anong topic ang pede sa linear regression na related sa civil. and kung pede po sana any advice na mga examples po. salamat po

[@KippapEducation]

Gumamit ako ng linear regression sa economics: straight line depreciation. You can watch an example kung paano ko yun ginamit sa video ko about Casio fx-82EX :)

[@markfajardo3620]

@@KippapEducation napanuod ko nga po un. ano pa po pedeng gamiting variables na correlated? gagawa po kase kami ng papers about dun kahit po sana tips or advice lang

[@KippapEducation]

@@markfajardo3620 sa straight line depreciation, linear ang correlation ng price ng phone and time. Habang tumatagal, bumababa ang price ng phone.

[@markfajardo3620]

@@KippapEducation un po sanang related sa civil? salamat po

[@KippapEducation]

@@markfajardo3620 linear din ang correlation ng flexural stress ng structural member subjected to bending sa distance ng point from the neutral axis

[@russelllloydsantos3329]

salanat po engr

[@dmdomingo1034]

Sir, what if ang hahanapin po ay location at magnitude of maximum deflection sa example po ninyo using conjugate beam? salamat po..

[@KippapEducation]

Good question haha! 1. Cut the beam and consider mo lang left side niya. 2. Make an equation of both the triangular load and spandrel load with respect to x. 3. Find the value of x where shear is equal to zero (kasi that means slope = 0, max deflection) 4. Solve for the moment at that distance and divide by EI to get the magnitude of deflection. Ang nakuha kong sagot is max deflection is 17 mm at x = 5.173 m from the left end. Post ko sa page yung solution soon!

[@hariffjacobmadrasa4735]

Reference line ko po kuya is sa reaction A po pera bakit 20.4mm nakukuha ko deflection sa D

[@cooletskerubin2762]

Galing mag explain

[@KippapEducation]

john joseph dela cruz thank you :D

[@rdeluna03]

Sir, if I may ask how to locate the maximum deflection?

[@lyriqs6410]

up

[@Kay-Dex]

For maximum deflection, cut po kayo ng segment, then set the shear as 0 (Maximum Moment can be found sa 0 shear, and sa method po na ito, ung moment = deflection). Once naka set po kayo ng shear as 0, find x using Summation of Forces vertical. Pag nakuha niyo na ung x, mag moment na kayo kung san kayo nag cut. Ung makukuhang Moment using the x = Max Deflection.

[@donnamaecagantas2979]

Good day sir yung area sa spandrel po A= BH/4, sinubukan po namin pero - 6 yung lumabas na answer, bakit po naging -36 yung answer?

[@KippapEducation]

6*(-24)/4 = -36

[@donnamaecagantas2979]

Bali po dalawa po yung binigay ngo na possible na formula. Sabi nyo po pwede yung bh/4 pero iba po yung lumabas..

[@KippapEducation]

@@donnamaecagantas2979 ang height na gagamitin niyo ay hindi yung height ng triangular load. Ang height ng spandrel ay -24. Base = 6 Height = -24 Area = b*h/4 = 6 * -24/4 = -36

[@leosalonggat6579]

Salamat po

[@albreicht7779]

i luv u po

[@hazelhopenanca3205]

mas madali double integration method,

[@KippapEducation]

Yup mas madali pero 1. Sobrang tagal niya gawin. 2-3x yung magagamit mong oras sa DIM. 2. Prone to errors ang DIM. Isang mali lang sa pag-iintegrate mali na agad ang solution.

[@knightplayer7360]

sabagay., pero kapag sanay kana, pwede mo ng, diritso sa deflection ang equation mo, na parang formula lang, at basic integration lng din naman,, pero depende narin yun sa tao idol saan kompurtable., salamat po

[@ralphanthonymallillin2712]

Bkit po di na cya minumultiply as triangle at rectangle dun sa forces at moment??