جسر العارضة اللوحية

جسر العارضة اللوحية

جسر العارضة اللوحية، هو جسر مسنود على عارضتين لوحيتين أو أكثر.[1]

نظرة عامة

في جسر العارضة اللوحية، تكون العوارض اللوحية عادةً عبارة عن ألواح معدنية على شكل حرف آي «I» منفصلة، والتي تلحم، أو تربط بالبراغي والسملّات كما في الجسور القديمة لتشكل اللوح المعدني. في بعض الحالات، قد تُشكّل العوارض اللوحية على شكل Z بدلا من شكل I. بني أول جسر عوارض من الحديد المطاوع الأنبوبي عام 1846-1847 على يد جيمس ميلهولاند في سكة حديد بالتيمور وأوهايو.[2]

PlateGirderBridgeUType
جسر العارضة اللوحية بشكل نصف دائري

تعد جسور العوارض اللوحية مناسبةً للبحور الصغيرة إلى المتوسطة، وقد تستخدم في السكك الحديدية، والطرق السريعة، أو غيرها من طرق المرور. عادة ما تكون نوعية الجسور هذه مسبقة الصنع، ويحدد طولها استنادًا إلى وسيلة النقل المستخدمة لنقلها من المصنع إلى موقع التركيب.[2]

بشكل عام، لا يقل عمق العارضة عن 1/15 من طول البحر، وبالنسبة لقدرة التحمل عند وزن معين، فإن العمق الذي يبلغ نحو 1/12 من طول البحر، يقلل من وزن العارضة. تكون الضغوط على الشفة بالقرب من مركز البحر أكبر من تلك الموجودة في نهايتها، لذلك فإنه غالبًا ما تعزز لوحتي الشفة العلوية والسفلية في وسط البحر. تمنع عناصر التقوية الوترة من الانبعاج تحت ضغط القص.[3]

المراجع

  1. ^ Hirol، Isami (2008). Plate-Girder Construction. BiblioBazaar. ISBN:9780554888026.
  2. ^ ا ب Henry Grattan Tyrrell, History of Bridge Engineering, Williams, Chicago, 1911; page 195. نسخة محفوظة 30 أبريل 2020 على موقع واي باك مشين.
  3. ^ The Building Trades Handbook, 3rd Ed., International Textbook Company, Scranton, 1914, pages 106-107.
أيقونة بذرة

هذه بذرة مقالة عن جسر بحاجة للتوسيع. فضلًا شارك في تحريرها.

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