Cable Tais Loads
Cable tais loads yog categorized rau hauv static loads, dynamic loads, thiab ntxiv loads.
Static load yog hais txog cov khoom thauj los ntawm cov cables ntsia hauv lub tais -tshwj xeeb yog lawv hom, ntau, thiab qhov hnyav ntawm ib chav tsev ntev (raws li txoj kab uas hla sab nraud)-tabulated raws li txoj kab sib txawv.
Dynamic load yog hais txog qhov hnyav ntawm kev tsim kho lossis kev saib xyuas cov neeg ua haujlwm thaum lub sijhawm teeb tsa thiab kev saib xyuas ntawm lub tais cable. Rau lub teeb yuag cable tais, dynamic loads feem ntau tsis xam; uas yog, cov neeg ua haujlwm tsis raug tso cai los sawv lossis taug kev ntawm cov tais. Yog tias yuav tsum tau sawv ntawm lub tais, qhov ncua ntawm kev txhawb nqa yuav tsum raug txo kom tsim nyog. Kev thauj khoom ntxiv tsuas yog siv rau kev teeb tsa sab nraum zoov thiab muaj cov khoom thauj los ntawm cov dej khov, daus, cua, thiab hluav taws xob hluav taws xob; cov no nyob ntawm cov huab cua hauv cheeb tsam thiab qhov xwm txheej ntawm cov hluav taws xob hluav taws xob, thiab yuav tsum raug xam raws li cov xwm txheej tshwj xeeb thaum lub sijhawm tsim qauv.
Cov kauj ruam rau xaiv Cable tais
(1) Txiav txim siab lub tais dav, tus naj npawb ntawm cov tiers, kev txhawb nqa hom thiab qhov sib nrug, thiab kev faib cov cables hla ntau qib.
(2) Xam cov load uniformly faib (kN / m²) rau cov cables ntawm txhua qib thiab ua ntej xaiv lub tais qauv thiab specifications.
(3) Txheeb xyuas qhov muaj zog ntawm lub tais raws li qhov siab tshaj plaws ntawm tag nrho cov kab hluav taws xob faib tawm. Daim ntawv pov thawj yog raws li nram no:
Q_service=q1 + q2
Qhov twg: q1=Uniformly faib cable load (kiv tus nqi siab tshaj plaws ntawm tag nrho cov tiers) (kN/m²); qhov no sawv cev rau lub load rau ntawm lub tais, ntaiv, los yog trough;
q2=Sib npaug sib npaug ntawm cov khoom thauj uas sawv cev rau qhov hnyav ntawm cov neeg ua haujlwm thaum lub sijhawm teeb tsa lossis kho (kN / m²); rau kev suav ntawm q2, qhov hnyav ntawm tus neeg feem ntau xav tias yog p=90 kg. Muab xam raws li cov xwm txheej ntawm qhov sib npaug siab tshaj plaws khoov lub sijhawm:
Qhov twg: P=load ntawm ib tug neeg (kg)
l=qhov sib nrug ntawm cov ntsiab lus txhawb nqa (siv tus nqi siab tshaj yog tias qhov sib txawv tsis sib npaug) (m)
q2=sib npaug sib npaug faib load rau ib tus neeg (kg/m)
Raws li tus qauv cable tais, cov lus qhia tshwj xeeb, thiab kev txhawb nqa qhov sib txawv ua ntej tau txiav txim siab saum toj no, sab laj nrog cov chaw tsim khoom catalog thiab rov txheeb xyuas qhov sib nrug thiab cov qauv kom txog thaum cov khoom yuav tsum tau ua.
(4) Deflection
Tsis muaj cov cai qhia meej txog kev txiav txim siab ntawm qhov muaj nuj nqis deflection; Txawm li cas los xij, hauv cov cheeb tsam uas muaj cov khoom hnyav, nws yog qhov tsim nyog kom txo qis deflection - uas txhais tau tias muaj kev nce ntxiv hauv kev siv steel. Yog li, yog tias cov hlau qhov siab tshaj plaws tso cai rau kev siv tag nrho thiab kev ruaj ntseg txaus, nws feem ntau tsim nyog los teeb tsa qhov sib piv ntawm qhov siab tshaj plaws deflection rau ncua (txhawb qhov sib nrug) ntawm 1/250 thiab 1/150.
