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معماری-عمران - تیرها ( تنش مجاز خمشی 4)

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پایان نامه | پروژه | مقاله | ترجمه | کارآفرینی | دانلود تحقیق آماده پایان نامه | پروژه | مقاله | ترجمه | کارآفرینی | دانلود تحقیق آماده پایان نامه | پروژه | مقاله | ترجمه | کارآفرینی | دانلود تحقیق آماده
چهارشنبه 26 اسفند 1388-02:57 ب.ظ




مطالب گفته شده تا كنون در مورد تیر با مقطع I  شكل بود.اگر مقطع تیر ما به صورت قوطی شكل بود باید شرط فشرده بودن ان توسط جدول كنترل فشردگی مقاطع كنترل گردد.اگر مقطع فشرده بود تنش مجاز خمشی حول هر 2 محور به مقدار 0.66*FY و اگر مقطع فشرده نبود تنش مجاز خمشی حول هر 2 محور به مقدار 0.6*FY خواهد بود.


اگر مقطع شما از 2 ناودانی به هم جوش شده {بدون فاصله} به صورت پیوسته تشكیل شده بود می توانید این مقطع را به صورت قوطی كنترل نمایید.


اصولا سعی كنید دهانه ها را حداكثر به 7 متر محدود كنید.اگر مقطع تیری برای دهانه ای ضعیف بود حتما بررسی كنید كه با پلیت تقویتی در محل های مورد نیاز{با توجه به دیاگرام ممان تیر} به چه هزینه ای خواهید رسید  وبا افزایش نمره تیر اهن به چه هزینه ای...چونكه تفاوت یك مهندس سازه با یك معمار تجربی در عملكرد اقتصادی انهاست.


حداكثر خیز مجاز تیرها را به 240/1 دهانه {بار مرده و زنده} محدود كنید.


اصولا در تیر ها برش حاكم بر طراحی نیست ولی با این حال با رابطه 0.4*FY كنترل می گردد وفقط جان تیر اهن در مقابله با برش كار می كند . بای تیر اهن نیز به تحمل خمش می پرذازد.


در درس پنجم به حل یك مثال كاربردی از تیرها  می پردازیم.




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تاریخ آخرین ویرایش:- -


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دوشنبه 20 خرداد 1398 11:58 ق.ظ
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