Cov txheej txheem feem ntau uas yuav raug khoov lub sijhawm yog cov nqaj, uasyuav khoov thaum thauj khoom ntawm txhua qhov chaw raws nws qhov ntev. Kev ua tsis tiav tuaj yeem tshwm sim vim yog khoov thaum lub zog tensile exerted los ntawm lub zog sib npaug los yog ntau tshaj qhov kawg ntawm lub zog (los yog kev ntxhov siab) ntawm lub caij.
Dab tsi ua rau lub sijhawm khoov hauv kab teeb?
Nyob rau hauv cov khoom siv kho tshuab, bending moment yog cov tshuaj tiv thaiv tshwm sim hauv cov txheej txheem thaum muaj kev quab yuam sab nraud lossis moment yog siv rau lub caij, ua rau lub ntsiab lus khoov. … Lwm yam beams tuaj yeem muaj ob qho kawg; Yog li ntawd txhua qhov kawg kev txhawb nqa muaj ob qho tib si bending moments thiab shear reaction loads.
Vim li cas lub beam khoov?
Khob ntawm kab. Kev khoov ntshiab uas pom hauv daim duab tuaj yeem yog tsim los ntawm kev siv plaub lub zog rau lub nqaj, ob ntawm kev coj rov qab ntawm txhua qhov kawg. Qhov kev teeb tsa no yog hu ua 'plaub taw tes dabtsi yog khoov' thiab ua rau lub sijhawm khoov zoo ib yam dhau ntawm qhov nruab nrab ntawm lub nqaj raws li qhia hauv (b) rov qab.
Dab tsi yog siv daim duab khoov lub sijhawm?
Shear thiab dabtsi yog khoov lub sijhawm daim duab kos yog cov cuab yeej tshuaj ntsuam siv ua ke nrog kev txheeb xyuas cov qauv los pab ua cov qauv tsim los ntawm kev txiav txim siab tus nqi ntawm lub zog shear thiab khoov lub sijhawm ntawm qhov taw qhia ntawm cov qauv tsim xws li beam.
Yuav ua li cas yog dabtsi yog khoov lub sij hawm ntawm ib seem ntawm ib tug beam?
Kev khoovmoments yog tsim los ntawm transverse loads siv rau kab teeb. … Lub sijhawm khoov ua haujlwm ntawm ib ntu ntawm lub nqaj, vim yog siv lub zog hloov pauv, yog muab los ntawm cov khoom siv quab yuam thiab nws qhov kev ncua deb ntawm ntu ntawd. Nws thiaj li muaj units ntawm N m.
