Method of Joints - Analysis of Trusses (🇵🇭 Tagalog 🇵🇭)

In this video let us discuss one of the common methods of analyzing truss structures - the method of joints. In this method, we apply the equilibrium conditions for translation in each joint in order to get the member forces.
#EngrLeir #EngineeringMechanics #Trusses
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Contents
0:00 Introduction
0:47 Steps in Method of Joints
2:48 Example
2:57 Calculate Reaction Forces
5:32 Free-Body Diagrams of Joints
7:15 How to start picking a joint
8:26 FBD of joint A
11:10 FBD of joint C
12:38 FBD of joint B
14:32 Considerations for symmetry
15:50 FBD of joint D
16:45 Member forces
17:39 Outro
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I will be uploading a new video each week and welcome suggestions for new topics. Please leave a comment or question below and I will do my best to address it. Thanks for watching!
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Hi, I'm EngrLeir, a Civil Engineer. This is a channel about Engineering. I want to share my knowledge to others. In this channel, I try to solve engineering problems in a step-by-step manner with focus on concepts rather than formulas.
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#EngrLeir #Engineering #TagalogTutorials #CEBoardExam

[@engrjame]

Hello po, paano po malalaman kapag sin or cos na yung gagamitin?

[@angelomariano2429]

vertical = cos
horizpntal= sin

[@engrleir]

It’s a common misconception na pag x cosine tapos pag y sine. Mas tama na cosine ung adjacent tapos sine pag opposite the given angle. For example nakadikit ung angle sa vertical, ibig sabihin ung component adjacent sakanya (ung vertical component) makukuha mo using cosine.

[@kennethrevilla4163]

SOH-CAH-TOA

[@luigiso7214]

Dito din ako nalilito buti nalang naitanong mo

[@luigiso7214]

@@engrleir thank you for the answer. Dito po talaga kasi ako nalilito kasi akala ko palagi cosine yung x-component. Kaya nacoconfuse ako pag sine yung ginagamit.

[@omizrafael6693]

Thank you po! This is so helpful! We need more tagalog engineering tutorials online in this very time.

[@neerwilyam4070]

thank you sir! i clearly understand. you explained it very well

[@ralphtanagras5041]

Maraming salamat sir! Naintindihan ko yung mga hindi ko naiintindihan before lalo na sa tamang application ng sine at cosine sa horizontal and vertical components (which is yung adjacent ang cosine at opp yung sine) at nagbigay kaalaman at kaliwanagan lalo sa pag aaral ko ng statics ngayong sem. Thank you so much po sir! God bless you po!

[@thepepperman3482]

Tapos ko na tong lesson na to last school year pero binabalikan ko pa rin upang matuto ako, pangarap ko kasing maging structural engineer and I think it is an essential thing na magrasp ko as I go forward sa aking journey. Salamat po dito Engr. God bless you po.

[@luigiso7214]

Thank you Engr. Laking tulong po to lalo na ngayong structural theory subject namin

[@chrisjaneldevilla8653]

Nice!!! Ganitong tutorial yung matagal ko nang hinahanap! QUALITYYYYY

[@sanny2970]

sir baka may idea ka kung pano nakuha ung -110 at -50 ??

[@haniahm.pamanay4871]

very well explained. thank you sir.

[@njiebullecer]

Ang galing magturooo! Thankyou po Sir!

[@riennaestrella8735]

so helpful. THANK YOU SO MUCH!!

[@elamparomelrochellb.1030]

thank you po! nalinawan ako, ready na ko sa quiz namin mamaya

[@charlesenricosalinas5368]

MAs maganda makinig dito, marami talaga akong natutunan :D

[@venicemolomolo7264]

Engr. pwede Kang mag upload lecture ng design. Magaling ka mag discuss engr. Thank you gid. Keep safe always 🤗

[@m.narcissus1209]

Salamat engr, parang mas deserve mo pa yung tuition ko

[@venicemolomolo7264]

Thank you engr. ❤️

[@lunarscythe1397]

Thank you po sir s lecture....

[@enablendacaderao7692]

thank you for this video sir, sakto sa review para sa mech :)

[@engrleir]

Thanks din for watching! 😄

[@pablotatsabong8325]

nice explanation.thanks

[@lailaniduga5193]

Pano po naging -50 yung fbd-fbe? Paano din po nakuha yung FBD na -80 tsaka FBE -30?

[@hanscastro49]

Currently studying this lesson sa may statics of rigid bodies po. Thank you so much sir! New subscriber here!

[@engrleir]

Thank you!

[@princesskhatrinedeguzman7993]

Thankyou Engr!

[@ryzhamaeescote5795]

Huhu thank you so much for this, we have a quiz tomorrow and I've been rlly havin a hard time understanding indians huehue. Rooting for ypur success! 💖💖💖

[@engrleir]

Glad I could help!

[@justinebarruga9513]

cool explanation ;-) I understand everything

[@engrleir]

Glad it helped!

[@kentdelacruz1868]

Galing!

[@kennethjamero4075]

lab it! tnx sir

[@vabybaby9682]

Thank you sir!!!

[@RoboArtCo]

More tutorials pls!!

[@clarisserafols9585]

Our Statics teacher recommended this. And you never failed her. Thank you!

[@engrleir]

Thanks for watching!

[@cristianespiritu8924]

@@engrleir pano po nakuha ung fbd=-80kn fbe=-30 kn di ko po magets e thank you po

[@angelbalajadia18]

@@cristianespiritu8924 2 eqn 2 unknows. caltech lang

[@jovanmagtoto1682]

salamat sir :)

[@KrugYT_]

salamat po, ang pogi ng boses ugh

[@Jeybiii_]

ty Sir!!!!!

[@alicitobalongoy2294]

Heaven sent!

[@enginearKrishy]

New subscriber here! Thank you so much engr!

[@engrleir]

Thanks for subbing!

[@yuukiozawa7262]

idol labyu thank u

[@arthjasonflores8910]

thankyou po

[@engrleir]

Welcome!

[@alyssapabilona6637]

Pano po ba naging -110? Di ko makuha sa calcu ko eh

[@arnnmac7692]

hello po Sir, sana po masagot tong tanong ko. ang compression or tensile po ba sa isang joint for example sa joint A is tensile at compression din po ba sa joint B?

[@dianacapistrano1964]

Thank youuuu po hahahahahaha

[@justinemaesalud7381]

Salamat po

[@bananajoe5385]

sir sa joint b sa pagkuha ng summation forces, bakit po yung value ng cosine at sine ay magparehas? thank you po!

[@makristaamada-yo2uy]

question lang po. if - po yung result ng reaction kasi counterclockwise po assumption, ifofollow pa rin po yung - na sign kapag nag-sum na sa point A? thank you po

[@honeygraceongayo922]

Pwede po bang show solution to other symmetries, kasi di ko po makuha kasi makuha alternate signs po yung lumalabas sa solutions ko though same po yung value alternate sign nga lang, saan po ba ako nag kamali sa solutions ko?

[@thepookiepoookie1808]

Hi sir! How did you come up with these results, po using the two equations, I don't know the process.

[@tadashifukato3758]

Sir may tanong po, pwede po sir gamitin yung positive 110 kn instead sa negative?

[@easymoney7344]

Sir sana magawan mo ng video lahat ng topics sa mechanics😭 salamat po💓 naka 1.5 po ako sa mechanics 1 ko po💓 salamat sa mga video nyo sana matulungan nyo naman ako sa mechanics 2 ko😭

[@robbiemoisesbao1198]

hi po sir do you have a video topic about deadloads and liveloads?

[@superjulyhann418]

16:14 I'm a bit confused with the method you used in getting the summation of forces y (vertical). You use cos, instead of sin. Could you please elaborate how you do the summation of forces? It'll be big help to me right now. Nice lectures you have there!

[@engrleir]

It’s a common misconception na pag x cosine tapos pag y sine. Mas tama na cosine ung adjacent tapos sine pag opposite the given angle. For example nakadikit ung angle sa vertical, ibig sabihin ung component adjacent sakanya (ung vertical component) makukuha mo using cosine.

[@archrishreybarredoompoy6356]

Sir paano malalaman ang mga angles wala naman sa given?

[@emanuelmuegue9966]

Hello po, paano niyo po nakuha yung sa banda dito sa 10:00 pag kinocompute ko po kasi iba po ang lumalabas. Thank you po sa pag sagot

[@cristianespiritu8924]

@engrleir pano po nakuha ung fbd=-80kn fbe=-30 kn

[@arjayn.caballero2362]

Hello sir. Im new here. Ask lang po pano po naging 30 degree yong sa joint A. Respect❤

[@SeekPim]

Hello Po, Nahihirapan Po Ako intindihin kung ano dapat inang Gawin mag moment or summation of forces? Pwede Po pa explain, Thank you very much

[@joshuacabungcalnepomuceno7944]

May chance po bang magkaroon 0 kN like sa F_BD? 😅May sinosolve po kasi ako katulad ng example niyo

[@shasvlogs9768]

hi pano nakuha yun -110?

[@jhaqui_s3654]

Paano po yung sa pagkuha ng forces sa member BD and BE, de ko po nagets seonsaengnim (sir) 😊

[@guzmanjohnemmanuel825]

Goodafternoon sir nalilito po ako kung paano naging negative 110 sa 9:08

[@youtubeskrt349]

Same po

[@joeffreyvalenzuela5099]

Sir pano po nagakasin sa summation of force x? Sa FAB?

[@daylejanzendayao1255]

Sir bakit po cos ang ginamit sa joint D e Y-axis yun ?

[@origenesjerome4051]

Update po kita pag pasado ako sa exam namin🥳

[@witwiw8395]

nakapasa kaba pre?

[@ruilesdreamtuneg.2768]

sir bakit di nyo po ginamit yung 50 kn sa member DE?

[@ryzhamaeescote5795]

Pano po maidentify kung ano gagamiting sign?

[@NATHALIELOUISETAN]

why is it positive FAC + 95.263 wherein in my calculator it is negative 95.263?

[@andraedelacruz2862]

wala po ba kayong review sessions hehehehe

[@charmenecarino1928]

Galing niyo magturo, sir. Sana sa inyo ko nalang binayad tuition ko. :))) New subscriber here po!

[@charlievitor7598]

Hahahahahha

[@tenten_ibarra]

anong app po gamit niyo sa pagdrawing

[@romeladianneretita9781]

Hello po panu naman po malaman if tan yung gagamitin?

[@knkymary7642]

pano po naging Fabsin30°+55?

[@albhycaber9567]

Hi good evening sir, I hope you get to reply to this question ASAP. In the FBD for Joint B, how did you get the angles, did you just assume it? or is there a proper analysis as to why those where the angles you used. Thank you.

[@albhycaber9567]

Ay joke, na gets ko na po.

[@_ane_ssa]

​@@albhycaber9567Care to share explanation po, Thank you!

[@antoniojr.concepcion8834]

sa joint B. bakit Fbd-Fbe= -50?

[@jonathantabangay5606]

❤️💚

[@christianjohnllorito2851]

Sir bakit naging 95. 263 po yung sa FCE sir?

[@camillepabalate1604]

Pano po siya i set up sa calcu

[@Pain-di3hy]

Sir nakuha ko pong elimination method kaso calcu. Ngayon pag indentify nya if fbd ba ang value na lumabas or fbe.Yung value ng X ko po sir ay -30 ay y ay -80. So nahirapan ako san sila na belong sa FBD OR FBE ba.

[@asal4642]

Pano po ang solve sa calcu para makuha ang -30 at -80?

[@joeriencanedo7343]

kung ganito mag lecture Instructor namin mas maiintindihan ko pa...hindi yung nag le-lecture na from the book yung terms

[@engrleir]

Thanks for watching!

[@kyangtutorials]

Paano makuha ang angle Sir halimbawa yunh 30° po

[@jessamaevillafranca2875]

Hi po sana naman may explanation kung pano nyo po na get yung value of BD and BE which is yung -80KN and -30KN. Sagot nalang po kasi agad yung binigay nyo hehe.

[@al-ghazyc.indanan1160]

paano po idol pag walang angle yung given problem?

[@kebkeb4587]

Sir, 2 questions: pwede po bang laging assumption ko ay clockwise positive? as in sa lahat ng problems po.
Paano po malalaman kung saan nakaturo ang horizontal force ng hinge support pag gagawa ng FBD before solving the problem?

[@engrleir]

1. Yes pwede. Basta consistent.
2. Iaasume mo xa. Pag negative nakuha mo ibig sabihin lang nun baliktad ung una mong assumption.

[@kebkeb4587]

@@engrleir very helpful sir! Maraming salamat!

[@ProfCharltonAcademy]

very nice lecture Engr. ano po pang software gamit ninyo using digital pad po..salamat po

[@engrleir]

Windows journal po

[@kjurat7196]

Sa una po, paanopo naging 55KN yon?

[@remercortes9945]

Fbd - Fbe = 50 Eq 2
tama po ba Engr o FBd -Fbe = 80 Eq 2?

[@charltoninao3565]

thanks sir s aclear explanation..
ano po palg software ginagamit niyo sa pagsusulat,..

[@engrleir]

Windows journal po

[@charltoninao3565]

@@engrleir thanks sir

[@usmanph5740]

baket po naging 60° ung sa fbd

[@lazotheodorea.9068]

bat -85 po lumalabas sakin sa eq. 2?

[@celeste-yk5lo]

san po galing yung -110 sa 8:25

[@aeriankylea.arguelles223]

papano po naging 110 kn?

[@josephinezanoriaaguilar8898]

Sir paanO niyO kinuha ang degree?

[@ericsoncorbilla7855]

sir, im a bit confuse on how you solve the force bd and be, can u pls explain it to me more? appreciate your videos😇

[@ericsoncorbilla7855]

up

[@archrishreybarredoompoy6356]

Sama here. Anyone who know how they come up with equation 1 and equation 2?

[@mgdellamas6345]

Try to subtract eqn. 1 and eqn.2😊

[@angelbalajadia18]

@@archrishreybarredoompoy6356 shift solve lang. let x = Fbd .. input x(cos30)-(-110)(cos30)=0 same procedure sa Fbe

[@kwanangelenejoye.5385]

Paano po nakuha ang mga angle?

[@lei3736]

hello question lang po. pano po nagiging cosine yung ginagamit kahit nag susumation forces of y
sana masagut nyo thanks!

[@mintchoco247]

cos = adj/hyp
sin = opp/hyp
I'll try to explain pa rin po kahit super late na haha. Sub hypotenuse to the force na hinahanap.
For example @point A, Force AB, may components siya na Fx at Fy.
Pag nagsum of Fx, FABcos30° ang gagamitin because adj yung Fx component ng AB.
cosØ = adj/hyp
sub given--> cos30 = Fx/FAB
Cross multiply; Fx = FABcos30
For Fy, sin because opposite yung Fy component. SinØ = opp/hyp
; sin30 = Fy/FAB
Fy = FABsin30°
Try po balikan yung Components of Resultant Force system sa statics of rigid bodies if nalilito pa rin. Fighting!

[@dominicgranada8528]

Sir correction lang po i think in joint b, the second equation should be equals to -80. If im not mistaken but still, you arrived at the right answer

[@josephinezanoriaaguilar8898]

-50 bro kasi divided by 2 both side to make the 1/2 as 1 and Multiply the -30 by 2 and the result is -60 and subtract the 110 which is 50 then transpose the 50, that's why it's -50. Sana makatulonG bro 😉

[@dominicgranada8528]

@@josephinezanoriaaguilar8898 ohhhh thanks bro

[@sapongenronaldomarttb.5501]

@@josephinezanoriaaguilar8898 you mean -30 ÷½ =-60?

[@archrishreybarredoompoy6356]

@@josephinezanoriaaguilar8898 sa equation 1 po paano po naging ganyan ang sagot?

[@akiredapyaYT]

Paano po nakuha ung 110? Iba lumalabas sa calcu eh..

[@andresmarkangelog.4184]

paano po nalalaman kung ano yung degree of angle ng bawat forces pag hindi given sa diagram?

[@dharrensablan3415]

up! sa po ay masagot

[@chrisjaneldevilla8653]

SIR! CENTROID PLEASE!!! PAKITA KO SA MGA KAKLASE KO, MAAAPRECIATE NILA TO!!!!

[@jewelleliannechua328]

How did you get the 60 degrees in joint B?

[@johnllasaf2095]

Same question. Alam niyo na po ba?

[@roland3819]

@@johnllasaf2095 alternate angles

[@archrishreybarredoompoy6356]

Paano pala malaman ang mga angles?

[@mintchoco247]

All triangles have interior angles that add up to 180º. As in matic po na 180° total ng angles loob. Right triangle is 90°, while 30° is given. 180 - 90 - 30 = 60°

[@eugeneerbon6881]

ask ko lang po pano makuha yung 30 degree? as if yung ibang mga problem walang nakaindicate kung ilang degrees

[@Sawshi_]

Sa ibang problem distance and height yung given walang angle

[@amirodinsolaiman8855]

Boss, sa pag solve mo ng Joint B, paano mo nakuha yung (√3/2) mo, saan yan siya nanggaling?

[@tadashifukato3758]

Cos(30) pag na input mo siya sa calcu magiging √3/2

[@christophercabanbanalvarad2241]

how did you get the angle of the respective forces in 12:44

[@jaysonarban7446]

hey same question

[@archrishreybarredoompoy6356]

Same question

[@ediroselendo1536]

Hello po. Sa 16:10, bakit po summation of forces sa y naging positive po yung downward? Thanks po

[@witwiw8395]

Assuming positive downward po siya sir, may plus sign sa katabi ng summation so meaning lahat downward ay positive.

[@pickthea9197]

Hello po paano po nakuha yung -50 sa Equation2? Please pa-answer naman po huhu tinry ko na po lahat pero 80 po yung nakukuha kong answer.

[@kookycrow9930]

Simplify mo multiply mo 2 sa Buong equation 2

[@enderlaurenceecuador76]

Pa help po. Sa 4:56 mins. Paano naging 55kN yung sagot😭 pls help

[@gezergeuelarenas7186]

12:51 Hello po, bakit po sine yung ginamit dun sa Fab? Medyo nalito lang po

[@kaziemarieong9953]

Sin=opp/hyp, ang opposite sa angle is yung horizontal line or x