Point of contraflexure feem ntau tshwm sim hauv overhanging beams.
Dab tsi yog qhov taw qhia ntawm kev sib cav?
A point of contraflexure yog a point where the curvature of beam change sign. Nws yog qee zaum raug xa mus rau qhov taw tes ntawm inflexion thiab yuav tshwm sim tom qab tshwm sim ntawm qhov taw tes, lossis cov ntsiab lus, ntawm kab teeb uas B. M. yog zero.
Yuav ua li cas yog tus nqi ntawm cov ntsiab lus ntawm contraflexure?
Ib qho taw qhia ntawm lub sijhawm khoov hloov nws cov cim los ntawm qhov zoo mus rau qhov tsis zoo thiab rov ua dua. Cov ntsiab lus no yog hu ua point of contraflexure. Lub sijhawm no, tus nqi khoov lub sijhawm yog zero (0).
Dab tsi yog qhov taw qhia ntawm qhov tsis sib haum xeeb hauv lub zog ntawm cov khoom?
Nyob rau hauv cov khoom siv kho tshuab, ib qho taw tes raws ib kab nyob rau hauv ib qho kev thauj khoom sab nraud yog lub npe hu ua qhov taw qhia ntawm qhov tsis sib xws yog lub sijhawm khoov txog qhov taw tes sib npaug zero … Tsis tas li ntawd, ib qho txaus ntawm qhov kev txhawb zog yuav tsum txuas ntxiv mus dhau qhov kev tsis sib haum xeeb txhawm rau txhim kho daim ntawv cog lus muaj zog thiab pab txhawb kev hloov lub zog shear.
Puas muaj pes tsawg lub ntsiab lus ntawm contraflexure tuaj yeem muaj nyob rau hauv ib sab overhanging beam raug rau downward acting loads xwb?
peb pom muaj 3 contra flexure cov ntsiab lus.
