Cawv kab (structural mechanics) lub ntsiab lus thiab lub ntsiab

Yuav ua li cas los tsim kom tau ib tug kab ntawm lub hwj? Lub Khoos Loos Tsev Txhua yam yog raws li nyob rau hauv kinematic Lagrange txoj kev. Nws essence lies nyob rau hauv lub fact tias nyob rau hauv ib tug system uas yog nyob rau hauv ib qho ntawm lub equilibrium, lub resultant ntawm tag nrho cov rog nyob rau hauv lub me xaav yog pes tsawg.

Cov tseem ntawm txoj kev

Yuav kom tsim txoj kab ntawm lub hwj ntawm cov tshuaj tiv thaiv, dabtsi yog khoov caij, chais ya cov plaub quab yuam rau ib tug muab seem ntawm lub beam, siv tej theem zuj zus ntawm kev ua. Yuav pib, tshem tawm cov link. Nyob rau hauv tas li ntawd, lub huv kab ntawm lub hwj ntawm Internal kev los muab qhov yuav tsum tau rau siab. Raws li ib tug ntawm xws li manipulations muab system yog ib tug mechanism muaj ib tug degree ntawm txoj kev ywj pheej. Nyob rau hauv cov kev taw qhia qhov chaw uas tus sab hauv kev nyuaj siab yog ntshai muab me ntsis zog. Nws coj yuav tsum zoo ib yam li lub hauv dag zog yuam, tsuas nyob rau hauv rooj plaub no yuav tsum tau zoo ua hauj lwm.

piv txwv ntawm Siv

Nyob rau lub hauv paus ntawm taw kaw equilibrium kab zauv los ntawm nws cov kev txiav txim siab xam cawv kab, txhais tau lub yuav tsum tau kev quab yuam.

Xav txog cov piv txwv ntawm cov suav. Tsim kab transverse quab yuam influences nyob rau hauv ib co seem A. Nyob rau hauv thiaj li yuav tiv nrog no ua hauj lwm, nws yog tsim nyog los tsim ib tug muab xaav epure beams los ntawm ib tug muaj zog nyob rau hauv cov kev taw qhia ntawm cov qoob loo quab yuam.

Cov mis rau kev txiav txim lub dag zog

Siv cov kev faib kab cawv yog nqa tawm siv ib lub mis. Nws uake yam lub dag zog yuam, qhov ntau ntawm ib tug dag zog yuam uas ua rau lub beam, nrog rau cov cheeb tsam ntawm lub daim duab tsim los ntawm cov kab thiab cov axis ntawm tus daim duab nyob rau hauv load. Thiab kuj nrog ib tug qhia ntawm lub dabtsi yog khoov sij hawm ntawd thiab tangent line ntawm tej yam rog thiab hauv nruab nrab axis.

Yog hais tias cov kev taw qhia ntawm muab faib rau load thiab concentrated quab yuam coincide nrog cov kev taw qhia ntawm cov mobile unit quab yuam, lawv muaj ib tug zoo nqi.

Cov dabtsi yog khoov caij zoo nqi nyob rau hauv lub rooj plaub uas nws coincides nrog cov kev taw qhia ntawm clockwise. Tangent yog zoo ntawm lub kaum sab xis ntawm kev sib hloov ntawm tsawg tshaj li ib txoj cai kaum sab xis. Nyob rau hauv nqa tawm cov lus teb siv nrog lawv tej yam tshwm sim ordinate nqi thiab lub cheeb tsam ntawm lub hwj ntawm txoj kab. Lub Khoos Loos Tsev Txhua yam yog raws li ib tug tshwm txoj kev tsim kos duab.

txhais

Ntawm no qhov yooj yim cov ntsiab lus txhais uas yuav tsum tau ua qhov zoo drawings thiab suav. Cawv kab - ib tug kab uas txuas lub nrog quab yuam thiab xaav ntawm ib mobile rog.

Lub ordinates qhia cov kev hloov nyob rau hauv lub analyzed nrog rog tshwm hauv ib lub taw tes rau hauv lub beam thaum tsiv raws qhov ntev ntawm ib tug quab yuam. Lawv qhia tus variation nyob rau hauv txawv cov ntsiab lus ntawm qhov suav hais tias hauv kev rau siab muab cov kev siv ntawm ib tug sab nraud tsau load. Statistical siv variant raws li nyob rau hauv cov ntaub ntawv uas tshuav nyiaj li sib npaug.

Ob variants ntawm qhov kev siv ntawm

Cov kev siv ntawm lub hwj kab nyob rau hauv lub beams thiab cov dabtsi yog khoov caij yog tau nyob rau hauv ob tus neeg. Force yuav positioned nyob rau txoj cai los yog sab laug nrog rau kev hwm mus siv seem. Thaum koj tawm hauv lub qhov chaw ntawm lub seem rog nyob rau hauv cov lus teb yuav xaiv rog uas yuav ua txoj cai. Thaum nws txoj cai kev txiav txim ntawm yog suav tias yog sab laug-tis rog.

multi-ncua beam

Cov txuas hniav, piv txwv li, lub koom haum pab beams yog siv rau cov kis ntawm ib tug sab nraud load rau tus kabmob feem ntawm tag nrho lub tsev qauv. Lub ntsiab beam yog hu ua ib tug uas yog cov cab kuj puag. Xav txog tus ntoo khaub lig beams, uas yog nyob rau hauv lub ntsiab cai kaum.

Koom haum pab (ib leeg-ncua) beam yog hu ua, uas yog txuas rau lwm load. Xws li ib tug hloov lwm lub tsev xaiv mus rau lub ntsiab beam load xam tau tias yog node. Vaj Huam Sib Luag yog lub cheeb tsam nyob nruab nrab ntawm ob tug nyob ze qhov chaw. Thiab lawv yog sawv cev raws li cov ntsiab lus tseem ceeb axis, uas haum rau tus ntoo khaub lig kab teeb.

nta

Yuav ua li cas yog txoj kab ntawm lub hwj? Lub ntsiab txhais ntawm no lub sij hawm nyob rau hauv lub beam txuam nrog lub teeb uas qhia tau hais tias cov kev hloov ntawm lub analyzed yam thaum tsiv tsev quab yuam nyob rau hauv lub beam. Nws muaj peev xwm ua raws li ib tug shear quab yuam, dabtsi yog khoov caij, txhawb cov tshuaj tiv thaiv. Tej ordinate cawv kab qhia tau hais tias qhov luaj li cas ntawm cov analyzed yam nyob rau hauv lub taw tes nyob rau hauv lub sij hawm thaum fais fab yog nyob rau nws. Yuav ua li cas los tsim kom tau cov kab ntawm lub hwj ntawm lub beam? Raws li ib tug tshwm txoj kev rau kev npaj ntawm statistical sib npaug. Piv txwv li, rau ib tug yooj yim beam ntawm lub ob pivot kabmob, yus muaj los ntawm ib tug dag zog yuam uas tsiv beam. Yog hais tias peb xaiv ib tug tej yam deb ntawm uas nws ua hauj lwm, nws yog ua tau los mus tsim txoj kab ntawm lub hwj ntawm cov tshuaj tiv thaiv, yuav ua rau cov kab zauv moments tsim ob point teeb.

Ces, ib tug nkhaus ntawm lub sab quab yuam ntawm tej yam, rau lub hom phiaj no, lub ordinate kab ntawm lub hwj nyob rau hauv lub seem.

cinematic txoj kev uas yuav

Yuav raws li nyob rau hauv lub taw ntawm txoj kab ntawm lub hwj yog ua tau. Piv txwv li cov zajlus yuav muaj nyob rau hauv tus neeg mob qhov twg ib tug nqaj xwm tsis muaj cov nyiaj them yug uas lub mechanism yuav txav mus nyob rau hauv ib tug zoo kev taw qhia.

Yuav kom tsim txoj kab ntawm lub hwj tej dabtsi yog khoov caij yuav tsum muab kos rau hauv cov uas twb muaj lawm seem pob khawm. Nyob rau hauv cov ntaub ntawv no, lub resulting mechanism yog rotated los ntawm ib chav tsev lub nyob rau hauv lub zoo kev taw qhia.

Constructing ib tug kab nyob rau hauv lub transverse tej yam quab yuam tau nyob rau inset nyob rau hauv lub swb seem thiab cov widening ntawm lub beam los ntawm ib tug nyob rau hauv lub zoo kev taw qhia.

Koj siv tau ib tug cinematic txoj kev los tsim ib txoj kab ntawm dabtsi yog khoov lub sij hawm ntawd thiab shear quab yuam nyob rau hauv lub cantilever beam. Nyob rau hauv view ntawm lub sab laug ntawm immobility nyob rau hauv ib tug zoo xws li cov zog ntawm tus nqaj yog suav tias yog tsuas yog rau cov sab xis nyob rau hauv lub zoo kev taw qhia. Vim tus ntawm cov kab raws li cov mis, koj yuav tau xam tej dag zog.

Suav txoj kev cinematic

Nyob rau hauv cov lus teb ntawm lub kinematic txoj kev siv ib tug qauv uas koom lub xov tooj ntawm cov nyiaj them yug rods, lub xov tooj ntawm spans, lub hinges, cov neeg kawm ntawv txoj kev ywj pheej ntawm cov neeg ua hauj lwm. Thaum hloov rau cov tsis muab qhov tseem ceeb rau tus xov tooj ntawm degrees ntawm txoj kev ywj pheej yuav ua ncaj rau zero, neeg ua hauj lwm yuav txiav txim cov lus. Yog hais tias qhov no daim duab yuav ua tau tsis zoo, cov lus tsis yooj yim sua ua hauj lwm, nrog rau cov zoo nqi ntawm cov degrees ntawm txoj kev ywj pheej yog ua geometric siv.

Nyob rau hauv thiaj li yuav ua rau nws yooj yim mus ua suav, muaj ib tug lub tswv yim ntshiab txog cov yam ntxwv ntawm disk ua hauj lwm nyob rau hauv ib tug ntau-beam tsev Pem Teb tswvyim.

Rau qhov kev hloov no mus rau lub pob khawm-tsau txhawb tag nrho cov thawj hinges yog muaj nyob rau hauv lub beam.

ntau ntau yam kab teeb

Nws lam xav ntau hom multi-ncua kab teeb. Cov tseem ntawm cov thawj hom yog tias nyob rau hauv tag nrho cov spans, tsuas yog cov thawj, siv pob khawm-rooj noj kev txhawb zog. Yog hais tias es tsis txhob siv hinges them nyiaj yug, yuav tsum tsim nyob rau ntawm ib beam, nyob rau hauv uas txhua yuav cia siab rau ib tug console nyob ze sawv.

Rau qhov thib ob hom yog yus interlace spans, uas muaj ob tug pivotally-rooj noj kev txhawb, ib tug ntsua kev tsis txhawb zog. Nyob rau hauv cov ntaub ntawv no, zaj dabneeg-Circuit Court nyob rau hauv central console beams raws li nyob rau hauv kab teeb paste.

Tsis tas li ntawd, muaj xws li kab teeb, uas yog raws li nyob rau hauv lub ob yav dhau los hom. Yuav kom paub meej statistical Definability beams inserts, nqa ib tug kab rov tav kev twb kev txuas ntawm cov nyiaj them yug rau hauv txoj cai uas nyob ib sab beam. Hauv pem teb pem teb nyob rau hauv ib chav hauv tswvyim yuav muab xa mus rau lub ntsiab beam thiab theem nrab beams yog siv rau lub sab sauv plag tsev.

Dluab nrog hwj chim yam

Siv theem kos duab yuav ua tau siv daim duab rau ib beam ntawm pem teb sab sauv thiab rau sab xaus constructs. Tom qab ua tiav lub tsev yuav faiv fab tso lub internal yam rau pem teb sab sauv, nws yog tsim nyog los hloov tag nrho cov tseem ceeb nyob rau cov tshuaj tiv thaiv ntawm kev txhawb pab rau cov kev coj rov qab ntawm lub dag zog yuam, thiab ces muab lawv nyob rau hauv Scheme ib pem teb mus rau lub sab pem teb. Nyob rau hauv qhov kev siv nyob saud yog kos duab predetermined load rog.

Tom qab kawm tiav ntawm kev tsim kho ntawm lub hwj chim kos duab nrog yam tseem ceeb nqa statistical check tag multispan girder. Thaum kuaj tau tus mob yuav tsum tau txaus siab, raws li uas tus sum ntawm tag nrho cov tshuaj thiab cov kev pab txhawb qhov muab rog yog pes tsawg. Nws tseem ceeb heev rau kev tsom xam raws li differential dependences rau tus neeg seem ntawm lub beam siv.

Nyob rau hauv lub teeb, uas qhia tus variation ntawm lub sab hauv them nyiaj yug los ib lub hwj chim zoo tshaj nyob rau hauv ib tug kev tshuaj tiv thaiv (predetermined) seem ntawm lub tsev, ib tug muaj nuj nqi ntawm lub qhov chaw nyob ntawm lub cargo-tsiv nyhuv hu ua kab. Lawv yuav siv los tsim ib tug statistical kab zauv.

Yuav kom txiav txim nrog hwj chim tshaj xam tshua txhawb rau tej yam kab ntawm lub hwj siv graphical duab kos tau tshwm.

xam ntsiab lus

Nyob rau hauv ib tug broad kev txiav txim zoo yam ntxwv mechanics ntshai li science uas tseem ua hauj lwm nrog txoj kev loj hlob ntawm txoj kev xam thiab pov thawj ntawm lug tej ntsiab cai thiab lug rau stability, lub dag lub zog thiab mob heev. Tsaug rau qhov zoo thiab timeliness ntawm cov nyiaj them rau lub dag lub zog yuav tau lees tias muaj kev ruaj ntseg ntawm qhov kev siv ntawm tej vaj tse, lawv tag nrho kuj mus nrog thiab lwm cov rog.

Mus cuag tej yam tshwm sim siv ib tug ua ke ntawm kev khwv nyiaj txiag thiab durability.

Cov lus teb rau stability cia cov cim ntawm lub tseem ceeb heev ntsuas ntawm lwm influences los xyuas kom meej qhov muaj kev ruaj ntseg ntawm tshuav nyiaj li cas muab tus duab thiab txoj hauj lwm nyob rau hauv lub deformed lub xeev.

Nruj suav yog kom paub tias txawv hom variants (precipitate deflections, deeg) vim mus rau tag nrho cov lag luam uas yog cais lug, yam ntxwv zog kev hem thawj tshwm sim.

Nyob rau hauv kev txiav txim kom tsis txhob muaj kev xwm txheej, nws yog ib qho tseem ceeb mus nqa tawm xws li suav, tsom xam cov indicators muab txwv qhov tseem ceeb.

Tam sim no, siv cov kws kho tsheb siv ib tug lossis loj ntau yam ntawm txhim khu kev qha txoj kev ntawm suav uas nws tau raug detailed tshuaj ntsuam txog ntawm qhov kev siv thiab engineering xyaum.

Muab kev Modernization thiab kev loj hlob ntawm kev tsim kho kev lag luam, nrog rau nws cov theoretical lub hauv paus, peb yuav tham txog txoj kev siv cov tshiab txhim khu kev qha thiab zoo txoj kev los tsim kom tau drawings.

Nyob rau hauv lub vos kev txiav txim zoo ntawm cov yam ntxwv mechanics txuam nrog rau theoretical suav ntawm rods, ib daim hlab, uas tsim qauv. Raws li ib tug puag rau ntxwv mechanics yog cov yuav tsum muaj physics, lej, kev sim kev tshawb fawb.

Payment schemes, uas yog siv nyob rau hauv cov yam ntxwv mechanics pob zeb, pob zeb ua, ntoo, hlau lug, yuav tsis txhob to taub thaum lub sij hawm qhov kev siv ntawm cov vaj tse cov lug. Tsuas yog nrog txoj cai ntawm pre-ua drawings nws yog ua tau los tham txog txoj kev ruaj ntseg thiab kev cia siab ntawm lug tsim. Cov kev siv ntawm lub hwj kab nyob rau hauv lub beams yog heev loj heev thiab lub luag hauj lwm txiav txim, vim hais tias cov neeg ntawm qhov kev txiav txim nyob ntawm tib neeg lub neej.