工程力学3静力学平衡问题ppt课件
《工程力学3静力学平衡问题ppt课件》由会员分享，可在线阅读，更多相关《工程力学3静力学平衡问题ppt课件（137页珍藏版）》请在装配图网上搜索。
1、TSINGHUA UNIVERSITY 范钦珊教育教学工作室 FAN Qin-Shans Education&Teaching Studio 返回总目录返回总目录TSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITY 整体平衡，局部必然平衡整体平衡，局部必然平衡TSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYCFR2FR1TSINGHUA UNIVERSITYFP1FP2FP3M1q(x)xFP6FP5FP4dxM2FP1FP2FP
2、3M1q(x)xTSINGHUA UNIVERSITYFP1FP2FP3M1q(x)xFP6FP5FP4dxM2dxq(x)FQ(x)M(x)TSINGHUA UNIVERSITYTSINGHUA UNIVERSITY返回总目录返回总目录TSINGHUA UNIVERSITY前往前往TSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYR10FFnii 10FnOOiiMMTSINGHUA UNIVERSITYRRR000 xixyiyzizFFFFFF000FFFOxOxiOyOyiOzOziM
3、MMMMMTSINGHUA UNIVERSITY0zF 00FFxyMM0FzM0FOMTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITY 0FAM0 xF0yFTSINGHUA UNIVERSITY 0FAM0sin2TWQlFxFlFBQWQPT2sin2FlxFllFxFFB0 xF0cosTBAxFF23cos302QWQWFxlFllFxFFAx0yF0sinTPQBAyFFFF2QWFFlxlFAyTSINGHUA UNIVERSITYQWQW
4、T2sin2FlxFllFxFFBQWQWQWT22sin302sin22FFFFllFlFFBTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITY0 xF0AxF0yF0PFqlFAyqlFAy2 0FAM02PMlFlqlMA225qlMATSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYFPTSINGHUA UNIVERSITYFPFAyFAxFBCTSINGHUA UNIVERSITYF
5、PFAyFAxFBCP2 2BCFFTSINGHUA UNIVERSITYFPFAyFAxFBCTSINGHUA UNIVERSITYFPFAyFAxFBCTSINGHUA UNIVERSITYM=FP lTSINGHUA UNIVERSITYFAxFByFBxFAyM=FP lFByFBxFCxFCyM=FP lTSINGHUA UNIVERSITYFAxFByFBxFAy考察考察ABDABD杆杆 的平衡的平衡 MB(F)=0 :MA(F)=0 :FBy=0FAy=0Fx=0 :FBx+FAx=0 FBx=-FAxTSINGHUA UNIVERSITYM=FP lFByFBxFCxFCy考察
6、考察BCBC杆杆 的平衡的平衡Fx=0 :FBx-FCx=0 FCx=FBx=FBxFy=0 :FBy-FCy=0 FCy=FBy =FBy=0 MB(F)=0 :FCx l+M=0FCx=FBx=-FPTSINGHUA UNIVERSITYM=FP lFPM=FP lFPFPFPTSINGHUA UNIVERSITYFAxFAyFAxFAyM=FP lM=FP lTSINGHUA UNIVERSITYFPTSINGHUA UNIVERSITYFPFCyFAFCxTSINGHUA UNIVERSITYFPFCyFAFCx ME(F)=0 :MA(F)=0 :MC(F)=0 :FCx l-FP
7、2l=0-FA l-FP 2l=0-FCy 2l-FA l=0ETSINGHUA UNIVERSITYM=FP lTSINGHUA UNIVERSITYM=FP lFAFCTSINGHUA UNIVERSITYM=FP lFAFC MC(F)=0 :FA=FC=FPFAl+M=0TSINGHUA UNIVERSITY前往前往TSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSIN
8、GHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITY FPTSINGHUA UNIVERSITYFDEFByFBxTSINGHUA UNIVERSITY FP FPFPTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITY0 xF0AxFTSINGHUA U
9、NIVERSITYTSINGHUA UNIVERSITY0FBMR202ClFlMqlR24CMqlFlTSINGHUA UNIVERSITY 0yFR20AyCFqlF 0AMR2240ACMqllMFlR24CMqlFllMqlFAy247MqlMA23TSINGHUA UNIVERSITYTSINGHUA UNIVERSITY前往前往TSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVER
10、SITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYFF max=fs FNFFd；FF max；TSINGHUA UNIVERSITYNsmaxFfFmax0FF TSINGHUA UNIVERSITYTSINGHUA UN
11、IVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYmaxFF maxFF TSINGHUA UNIVERSITYWP0sin30cos300 xFFFF F153.6 N TSINGHUA UNIVERSITY213.2NN106620Nsmax.FfFmaxFF NWP0cos30sin300yFFFFFN1066 N WP0sin30cos300 xFFFF F153.6 N TSINGHUA UNIVERSITYTSINGHUA UNIVERSITY0cos30sin300PminWmaxFFFFx0sin30cos300PninWNFFFFyN
12、smaxFfFTSINGHUA UNIVERSITYTSINGHUA UNIVERSITY 0sincos201N1，lFlWMBAF00NWFFAy00NBAxFFFTSINGHUA UNIVERSITY 0sincos201N1，lFlWMBAF00NWFFAy00NBAxFFF11N2sincosWFBWNFFA1Ncot2WFFBATSINGHUA UNIVERSITY 0sincos20N，lFlWMBAF00NWFFAy00NBAxFFFAAFfFNsTSINGHUA UNIVERSITYN0cossin02FABlMWFl ，00NWFFAy00NBAxFFFAAFfFNss2a
13、rccotfs2arccotfTSINGHUA UNIVERSITY前往前往TSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYWyW xWTSINGHUA UNIVERSITYWyW x坡度很小时，刚性块不滑动坡度很小时，刚性块不滑动TSINGHUA UNIVERSIT
14、YWyW x坡度增加到一定数值以后，刚性块滑动坡度增加到一定数值以后，刚性块滑动TSINGHUA UNIVERSITYWyW x坡度增加到一定数值时，刚性块处于临界状态坡度增加到一定数值时，刚性块处于临界状态TSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYTSINGHUA UNIVERSITYCBAllFPFAFBTSINGHUA UNIVERSITYCBAllFPFAFBTSINGHUA UNIVERSITY返回总目录返回总目录前往前往
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