第十章動荷載ppt課件

1、 第十章第十章 動載荷動載荷(Dynamic loading)stddKPaxmmPaxmmPaPaagPagPmaNstF)(1(NdAgxPgaF AgxPF NststdNstdNdd KAFKAF stdd KxmmPAg xmmAgAa agPP NdF無加速度時的無加速度時的受力情況受力情況有加速度時的有加速度時的受力情況受力情況gaKFKFd1NstdNd stddK xmmAg AaAg agPP PNdFNstFlxmnaxaqstqG)1()(stNdgaAgxxqqFG )1 (NddgagxAFAaqG stmaxddmax KgaK 1dAgqstrO rO rO q

2、d2)2)(1(22dDADAq 2n2 Da OqdyFd d d(d )2Dq FNdFNd2)2)(1(22dDADAq 2 dsin4 sin)d2(220220ddDADADqF 4222dNdDAFF 422NddDAF Fdoqdy d FNdFNd422ddDAF 2dv)d2(d Dq2Dv 2vd FGlO22nGFmaRmlG/g AFGd/ ( )2GFGlAg R0R1ld mmx葉葉根根頂頂部部轉轉軸軸)211()(0lxAxAd( )dmA )(02n RaR0R1ld mmx葉葉根根頂頂部部轉轉軸軸20d() dFmR 20() ( )dAR FNxdFxmmR

3、0R1ld mmx葉葉根根頂頂部部轉轉軸軸dFF 20() ( )dlxAR lxxARF )d()(N0 02 2dFFNxxmmR0R1ld mmx葉葉根根頂頂部部轉轉軸軸4330202NmaxlRlAF 11()()200Nmax051134FvRRgARR RRl011vR dPFNxxmmR0R1ld mmx葉葉根根頂頂部部)()d(NxEAdxFlx N0d( )lxFlxEA x 22031132(ln2)(ln2) 42183lllRE 111222+=+ddTVVTVVe ee e(1/2)=DdddVPe eddstddstddstPK PKK vhhPTmvvg22112

4、2 VmghPh110dV 20T ddVmgP2 212dddVP hd2P1PhvPF2g2 dd d d d stFP dd stFP 2 d d d st1()22PP hvP g+=hd11d122d2+=+TVVTVVdV0)2(222stdstdgvh)/211 (2)/48(42222stststststdgvhgvhstddK stdgvhK/21122d st2/112hvgK+=+=Dh22dstst2/1111hvgvKg+=+=+h0vvghg20d st2K =11 vghg20d st2K =11 ddstddstddstPK PKK Vd1Vd211d122d2+=+TVVTVV2/2/2ddmvP=DddstPPD=Dvg2d stK = hlAPBd FdAB d st211hK EAPlstdsthPKA d st211 APsthIEaP3 34 43 3 st 3 32 23 31 11 12 21 11 1aPhIEhK st d WaPaPhIEK)(maxstdmaxd3 32 23 31 11 1 PPaPaPPaPa313cPawEI=（ ）BACPwc1BCPBAPa22BPaEIq q=EIPaEIPaaEIPaawwBcc34333221EIPawB232