22 Duøng 3 maët caét ngang Xaùc ñònh caùc thaønh phaàn noäi löïc Q y vaø M x

# 22 duøng 3 maët caét ngang xaùc ñònh caùc

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4.2.2. Duøng 3 maët caét ngang: Xaùc ñònh caùc thaønh phaàn noäi löïc Q y vaø M x : - Maët caét trong ñoaïn AB (hình 4.7): ) a z 0 ( 1 Ñieàu kieän caân baèng A0 1 : 0 z . N M M 0 N Q F 1 A 1 x 01 A 1 y y (1.13) 0 z . qa z . N M 0 qa N Q 1 1 A 1 x A 1 y (1.14) -Maët caét trong ñoaïn BC: ) a 3 z a ( 2 Ñieàu kieän caân baèng ñoaïn A0 2 (hình 4.8): 2 2 2 2 02 2 2 0 0 2 ( ) ( ) . y y A x A F Q q z a N q z a M M N z (1.15) 2 qa z . qa 2 z 2 q M qa 2 qz Q 2 2 2 2 2 x 2 2 y (1.16) - Maët caét trong ñoaïn CD (hình 4.9): ) a 4 z a 3 ( 3 Ñieàu kieän caân baèng ñoaïn A0 3 : 0 z . N ) a 2 z ( qa 2 M M 0 N qa 2 Q F 3 A 3 3 x 03 A 3 y y (1.17) 2 3 3 x 3 y qa 4 z . qa M 0 qa Q (1.18) Töø (4.14), (4.16), (4.18) ta veõ ñöôïc hai bieåu ñoà noäi löïc (hình 4.10): A 1 0 1 z z y qa N A 1 x M 1 y Q Hình 1.7 A B q 2 z a z y A N 2 x M 2 y Q 2 0 Hình 1.8 A B C q a 2 a 3 z z y A N y 3 x M 3 y Q 3 0 Hình 1. 9

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Giaùo Trình CÔ CHÖÔNG 1: KHAÙI NIEÄM CÔ BAÛN VEÀ CÔ HOÏC VAÄT RAÉN BIEÁN DAÏNG 68 TS. Vuõ Coâng Hoøa z qa N D A D B C q a 2 a a y qa N A a 2 qa 2 2 3 qa Hình 1.10 M x qa qa E Q y
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