ko‘p oraliqli statik aniq balkalarni doimiy yuklar ta’siriga hisoblash

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4 - amaliy mashg‘ulotlar mavzu: ko‘p oraliqli statik aniq balkalarni doimiy yuklar ta’siriga hisoblash ko‘zg‘almas tashqi yuklar ta’sirida bo‘lgan ko‘p oraliqli sharnirli balkalarni hisoblashni quyidagi misolda ko‘ramiz. misol. 3.1-rasm, a da tasvirlangan qo‘zg‘almas tashqi yuklar ta’siridagi ko‘p oraliqli sharnirli balka uchun eguvchi moment va ko‘ndalang kuch epyuralari analitik usuda chizilsing. echish: 1. ko‘p oraliqli statik aniq balkani kinematik tahlil qilish. berilgan balkani kinematik tahlil qilish uchun, avvalo quyidagi formula yordamida balkadagi sharnirlar sonini aniqlaymiz: ш = сt –3 = 6 – 3 = 3. ko‘p oraliqli balkada 3 ta sharnir mavjud bo‘lib, ular sharnirlarni joylashtirish qoidasiga muvofiq joylashtirilgan. demak, ko‘p oraliqli sharnirli balka geometrik o‘zgarmas bo‘lib, statik aniq ekan. 2. ko‘p oraliqli balkaning qavatli tarhi tuzish. balka elementlarining o‘zaro bog‘lanishi qavatlar tarhi 3.1-rasm, b da ko‘rsatilgan bo‘lib, unda asosiy, yordamchi va osma balkalar belgilab ko‘rsatilgan. 3. balka sterjenlari kesimlaridagi ichki zo‘riqishlarni aniqlash va ularni tekshirish. 1) yuqorida ko‘rsatib o‘tganimizdek hisoblash …
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radi. maksimal eguvchi momentning qiymatini aniqlash uchun eguvchi moment tenglamasidan x bo‘yicha bir marta hosila olamiz va uni, yoki ko‘ndalang kuch tenglamasini nolga tenglaymiz, chunki juravskiy teoremasiga binoan . = 0.5 - x1 = 0, bundan = 0,5 m. demak, maksimal eguvchi momentning qiymati balkaning chap tayanchidan 0,5 m masofadagi kesimda hosil bo‘ladi va uning qiymati quyidagicha aniqlanadi: ikkinchi oraliq : ; agar = 0 bo‘lsa, = 0; = 2 m bo‘lsa, = -10 knm. topilgan qiymatlar asosida mx va qx epyuralarini chizamiz (4.1-rasm, g). 3) asosiy aвш1 balkani hisoblash. bu balka ш1 sharniriga tayangan ш1ш2 osma balkaning ta’sirini rш1 reaksiya (teskari yo‘naltirib) orqali almashtirib, ra va rв tayanch reaksiyalarini aniqlaymiz va mx va qx epyuralarini chizamiz (4.1-rasm, d). tekshirish: birinchi oraliq () uchun mx va qx uchun tenglamalarini tuzib, ularning ordinatalarini aniqlaymiz: agar = 0 bo‘lsa, = 0; = 2 m bo‘lsa, = 2 knm. ikkinchi oraliq (): agar …
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) va ko‘ndalang kuch () epyuralarini quramiz. bu epyuralar 4.1-rasm, h va i da ko‘rsatilgan. oleobject3.bin oleobject57.bin image40.wmf oleobject58.bin oleobject59.bin oleobject60.bin image41.wmf oleobject61.bin image42.wmf oleobject62.bin image43.wmf image4.wmf oleobject63.bin image44.wmf oleobject64.bin image45.wmf oleobject65.bin image46.wmf oleobject66.bin oleobject67.bin oleobject68.bin image47.wmf oleobject4.bin oleobject69.bin image48.wmf oleobject70.bin image49.wmf oleobject71.bin image50.wmf oleobject72.bin image51.wmf oleobject73.bin oleobject74.bin image5.wmf oleobject75.bin image52.wmf oleobject76.bin image53.wmf oleobject77.bin image54.wmf oleobject78.bin image55.wmf oleobject79.bin image56.wmf oleobject5.bin oleobject80.bin oleobject81.bin oleobject82.bin image57.wmf oleobject83.bin image58.wmf oleobject84.bin image59.wmf oleobject85.bin image60.wmf image6.wmf oleobject86.bin image61.wmf oleobject87.bin oleobject88.bin oleobject89.bin image62.wmf oleobject90.bin image63.wmf oleobject91.bin image64.wmf oleobject6.bin oleobject92.bin image65.wmf oleobject93.bin image66.wmf oleobject94.bin oleobject95.bin oleobject96.bin image67.wmf oleobject97.bin image68.wmf image7.wmf oleobject98.bin image69.wmf oleobject99.bin image70.wmf oleobject100.bin image71.wmf oleobject101.bin oleobject102.bin oleobject103.bin image72.wmf oleobject7.bin oleobject104.bin image73.wmf oleobject105.bin oleobject106.bin oleobject107.bin image74.wmf oleobject108.bin image75.wmf oleobject109.bin image8.wmf oleobject8.bin image9.wmf oleobject9.bin image10.wmf oleobject10.bin image11.wmf oleobject11.bin oleobject12.bin oleobject13.bin oleobject14.bin oleobject15.bin image12.wmf oleobject16.bin oleobject17.bin image13.wmf oleobject18.bin image14.wmf oleobject19.bin image15.wmf oleobject20.bin image16.wmf oleobject21.bin image17.wmf oleobject22.bin image18.wmf oleobject23.bin image19.wmf oleobject24.bin image20.wmf oleobject25.bin image1.wmf oleobject26.bin oleobject27.bin oleobject28.bin
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oleobject29.bin oleobject30.bin oleobject31.bin oleobject32.bin image21.wmf oleobject33.bin oleobject34.bin oleobject1.bin oleobject35.bin image22.wmf oleobject36.bin image23.wmf oleobject37.bin image24.wmf oleobject38.bin image25.wmf oleobject39.bin image26.wmf image2.wmf oleobject40.bin image27.wmf oleobject41.bin oleobject42.bin oleobject43.bin image28.wmf oleobject44.bin image29.wmf oleobject45.bin image30.wmf oleobject2.bin oleobject46.bin image31.wmf oleobject47.bin image32.wmf oleobject48.bin image33.wmf oleobject49.bin image34.wmf oleobject50.bin image35.wmf image3.wmf oleobject51.bin oleobject52.bin oleobject53.bin image36.wmf oleobject54.bin image37.wmf oleobject55.bin image38.wmf oleobject56.bin image39.wmf 2 x м o s ma b . as . b . d а) p 1 =8 kn м=20 knm c в а e h f g q 1 = 2 kn / m q 2 = 1 kn / m p 2 =5 kn 2 2 3 4 3 2 2 2 5 2 3 .1 - rasm. yor . b . а а в as . b . c d e f g h r c =4 kn r d = 4 kn q 2 = 1 kn / m p 2 =5 kn r g =0, …
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d e f = - - = = × + + × - × = å å = - - + = - - + = . 0 5 , 0 4 75 , 3 75 , 0 g d f e r r r r у x q м х 2 0 1 £ £ ; 4 1 1 1 x х r м d x × - = × - = . 4 1 kn r q d x - = - = 1 x 1 x m м х 2 0 2 £ £ . 25 , 3 8 75 , 0 4 8 ) 2 ( 2 2 2 2 2 2 x х x х r x r м e d x - - = + - - = × + + - = кn r r q e d x 25 , 3 75 …

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4 - amaliy mashg‘ulotlar mavzu: ko‘p oraliqli statik aniq balkalarni doimiy yuklar ta’siriga hisoblash ko‘zg‘almas tashqi yuklar ta’sirida bo‘lgan ko‘p oraliqli sharnirli balkalarni hisoblashni quyidagi misolda ko‘ramiz. misol. 3.1-rasm, a da tasvirlangan qo‘zg‘almas tashqi yuklar ta’siridagi ko‘p oraliqli sharnirli balka uchun eguvchi moment va ko‘ndalang kuch epyuralari analitik usuda chizilsing. echish: 1. ko‘p oraliqli statik aniq balkani kinematik tahlil qilish. berilgan balkani kinematik tahlil qilish uchun, avvalo quyidagi formula yordamida balkadagi sharnirlar sonini aniqlaymiz: ш = сt –3 = 6 – 3 = 3. ko‘p oraliqli balkada 3 ta sharnir mavjud bo‘lib, ular sharnirlarni joylashtirish qoidasiga muvofiq joylashtirilgan. demak, ko‘p oraliqli sharnirli balka geometrik o‘zgarmas bo‘lib, s...

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