QAPHELA: I-fl yimbonakalo eguqukayo. Mayisetyenziswe ngokudibeneyo kunye nejika elinamandla. Ivela kumava kunye novavanyo. Ixabiso lesalathiso esekwe kumthwalo ophezulu wokusebenza.

Umzekelo: Umzobo wePortal Crane

Indlela yokubala yendlela ephezulu iyacetyiswa ngolu hlobo lulandelayo:

Ngaphambi kokukhetha inkxaso ejikelezileyo, into yokhuseleko lwe-tictor ye-FS ekufuneka ithathelwe ingqalelo ukuba i-vist igqitywe, enokufumaneka kwiShedyuli 1. I-Portal Crane: I-FS = 1.45

Xa umthwalo ophezulu owomileyo owaziwayo, ifomula yokubala yomthwalo wayo imi ngolu hlobo lulandelayo:

1) Owona mthwalo uphakamileyo wenqanaba lesibhozo lomoya

I-Axial Force FA = q + a + o + g

I-Organnetion M = Q × LMAX + A × Amax + w × o × o - G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × G × g

2) nokuba ungakhathali phantsi komsebenzi, qwalasela umthwalo we-25% yovavanyo lovavanyo

I-Axial Force FA = 1.25 × Q + A + O + G

I-Organnetion M = 1.25 × Q × LMAX + A × Amax - o × o - G ×

Umzekelo: Umthwalo wokusebenza kunye nokudibanisa izibuko le-clamshell zaziwa ngolu hlobo lulandelayo:

Q = 260 KK LMAX = 23 m 1max = 23m

A = 75 i-75 Kn Amax = 11 m amax = 11m

O = 450 KN O = 0.75 m O = 0.75m

G = 900 KY G = 3 m g = 3m

W = 27 n r = 6.5 m1) r = 6.5m

Ubuninzi bomthwalo wamandla omoya kwinqanaba le-8

Fa = q + a + o + g

= 260 + 75 + 450 + 900

= 1685 n

M = Q × LMAX + A × Amax + w × × o - G × G × G × g

=260 × 23 + 75 × 11 + 27 ×6.5×450 ×0.75×900 × 3

= 3943 knm

2) Nokuba ungabinamsebenzi womoya, qwalasela umthwalo ophezulu wokusebenza kwe-25% yovavanyo lovavanyo

FA = 1.25 × Q + A + O + G

= 325 +75 +450 +900

= 1750kn

M = 1.25 × Q × LMAX + A × Amax - o × O X A - G × g × g

= 325 × 23 + 75 × 11 × 11 × 0.75 × 900 × 900

= 5566.3.3Km

3) Ubuninzi bomthwalo obungaphantsi kwetyala lomoya

FA = 1685 nn

M = q × lmax + a × amax - o × o - G × g

= 260 × 23 + 75 × 11 × 450 × 4,550 × 900 × 900 × 900 × 900 × 900 × 900

= 3767.5 KNM

Imeko yokuLawulwa 2 isetyenziswa njengoMthwalo wokuSebenza oBalo

Ngokutsho kweShedyuli 1, i-ratial crane (ibhakethi ye-Grab) kufuneka ixhaswe yimiqolo emithathu yenkxaso ye-roller-

Umthwalo omiselweyo weNkxaso-mali yeNkxaso-mali:

Fai '= 1750 KN × 1.45 = 2537.5 KY m m' = 5566.3.7.3. 8071.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.1.171.1.1 knum

Ubalo lokubala lweBolt ngu:

FA = 1750 Kn m = 5566.3 knm

Ngokutsho kokubala okungasentla iziphumo, ukukhetha ukubala okusesikweni kuphumela, ukukhetha ukubakho kwengqolowa kunokuzimisela ukukhetha iNkxaso ye-13 * .45.2000.002

Le nkcazo ingentla yindlela ebalwayoukubulala ukubulalaubungakanani. Ngokweziphumo zokubala, unokukhetha i-AILTukubulala ukubulalaUmzekelo kwiIkhathalogu yeMveliso. Ukuba awuyazi indlela yokubala, nceda ukhululeke ukunxibelelana nathi nge-imeyile. Siza kukunceda ngentliziyo iphela!