statik noaniq ramalarni kuchlar usulida hisoblash

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13-амалиёт statik noaniq ramalarni kuchlar usulida hisoblash misol. 19.1-rasm, a da berilgan statik noaniq rama tashqi yuklar ta’siriga kuchlar usuli bilan hisoblansin. echish. 1. ramani statik noaniqlik darajasi aniqlash. berilgan ramani statik noaniqlik darajasi (19.1) va (19.2) formulaga asosan aniqlanadi. ; . demak, rama ikki marta statik noaniq, ya’ni u ikkita ortiqcha bog‘lanishga ega. 2. ramani asosiy sistemasi tanlash. ramaning 2 ta ortiqcha bog‘lanishini noma’lum zo‘riqishlar x1 va x2 bilan belgilab, asosiy sistema tanlaymiz (19.1-rasm, b). 2. kuchlar usulining kanonik tenglamalar sistemasi yozish. kuchlar usuli kanonik tenglamalar sistemasini yozamiz: ; . 3. birlik va tashqi yuk eguvchi moment epyuralarini chizish. kanonik tenglama koeffitsientlarini va ozod hadlarini aniqlash uchun alohida-alohida va kuchlardan birlik epyuralarni va tashqi yukdan mr epyurani chizamiz (19.2-rasm, a, b, v). 4. kanonik tenglama koeffitsientlarini va ozod hadlarini aniqlash. bu epyuralardan foydalanib, tenglamadagi birlik ko‘chishlar va ozod hadlarning vereщagin usuli yordamida aniqlaymiz. ; ; . 5. kanonik tenglama …

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tiramiz. 8. mx epyurani tekshirish. mx epyurani tekshirish statik va deformatsion tekshirishlardan iborat bo‘ladi. a) statik tekshirish. bu tekshirishda s tugunni qirqib muvozanat shartini qaraymiz (19.3-rasm, v). ; 3,6-3,6=0. b) deformatsion tekshirish. bu tekshirishda birlik epyuralar yig‘indisi ms (13.2-rasm, g) yakuniy mx epyuraga ko‘paytiriladi. natija nolga teng bo‘lishi kerak. . demak, yakuniy mx epyura to‘g‘ri hisoblangan. 10. ko‘ngdalang kuch epyurasini chizish. mx epyuradan foydalanib qx epyurani quramiz (19.4-rasm, a). bu erda ramaning har bir sterjenini oddiy balka deb qaraymiz. qx epyura quyidagi formula yordamida hisoblanadi. bu erda - oddiy balkadagi ko‘ngdalang kuch; - oddiy balkaning o‘ng uchidagi eguvchi moment; - oddiy balkaning chap uchidagi eguvchi moment; - oddiy balkaning uzunligi. св sterjendagi ko‘ngdalang kuchni aniklaymiz. bu erda tashqi yuk ta’siri kilganligi uchun uni hisobga olinadi. mx epyuradagi s va v kesimlardagi eguvchi momentlarni oddiy balkaning с va в tayanchlariga qo‘yamiz. ushbu balkada agar x=0 bo‘lsa qc=3,6 kn; x=6 bo‘lsa qv=-2,4 …

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) а) 0 2 2 22 1 21 = d + + × р х х d d 1 1 = х 1 2 = х 2 1 м , м å ò = × × + × × × = = ei ei ei dx ei м 144 6 4 6 2 1 6 3 2 2 6 6 1 2 1 11 d 18 18 18 1 9 . 2 - расм а) б) 6 6 1 1 = х м 1 м 2 4 1 2 = х 6 6 м s 10 в) 4,5 м р 6 г) 1 2 = х 1 1 = х 10 мs 18 6 6 18 г) 18 мр 4,5 � embed equation.3 �� 4 19.2-расм м2 6 в) 6 6 м1 � embed equation.3 �� б) а) _1018178209.unknown _1018178229.unknown å ò = × × = × = = ei …

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/2=3 кн х rв0=q(/2=3кн 2.4 3.6 � embed equation.3 �� с мс=3.6 q=1кнм мв=0 в (=6 rс0=q(/2=3кн _1018178417.unknown 2 4 2 3 3 = - × = - = ш k n x qx qe q cb - = - = 3 2 0 = - + = e m m q q c b cb cb 0 x x - = + + - = 6 , 3 6 6 , 3 0 3 kh м 88 , 2 2 4 , 2 4 , 2 4 , 2 2 4 , 2 4 , 2 2 0 6 max = - × = × - × = q r m x 0 m . 0 = ac q

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13-амалиёт statik noaniq ramalarni kuchlar usulida hisoblash misol. 19.1-rasm, a da berilgan statik noaniq rama tashqi yuklar ta’siriga kuchlar usuli bilan hisoblansin. echish. 1. ramani statik noaniqlik darajasi aniqlash. berilgan ramani statik noaniqlik darajasi (19.1) va (19.2) formulaga asosan aniqlanadi. ; . demak, rama ikki marta statik noaniq, ya’ni u ikkita ortiqcha bog‘lanishga ega. 2. ramani asosiy sistemasi tanlash. ramaning 2 ta ortiqcha bog‘lanishini noma’lum zo‘riqishlar x1 va x2 bilan belgilab, asosiy sistema tanlaymiz (19.1-rasm, b). 2. kuchlar usulining kanonik tenglamalar sistemasi yozish. kuchlar usuli kanonik tenglamalar sistemasini yozamiz: ; . 3. birlik va tashqi yuk eguvchi moment epyuralarini chizish. kanonik tenglama koeffitsientlarini va ozod hadlarini aniqlash uc...

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