{"id":18368,"date":"2022-03-01T12:00:59","date_gmt":"2022-03-01T11:00:59","guid":{"rendered":"https:\/\/strusoft.com\/?p=18368"},"modified":"2024-05-16T17:46:42","modified_gmt":"2024-05-16T15:46:42","slug":"bojknackning-av-betong-vilken-metod-ar-bast","status":"publish","type":"post","link":"https:\/\/strusoft.com\/sv\/blog\/blog-sv-2\/bojknackning-av-betong-vilken-metod-ar-bast\/","title":{"rendered":"B\u00f6jkn\u00e4ckning av betong. Vilken metod \u00e4r b\u00e4st?"},"content":{"rendered":"

I ett tidigare Tips & Trix har de tre metoderna f\u00f6r att ber\u00e4kna b\u00f6jkn\u00e4ckning av betong enligt EC2 beskrivits, se magasinet Reaktion fr\u00e5n februari 2020. Den Generella metoden enligt EC2 5.8.6 och de f\u00f6renklade metoderna Styvhetsmetoden 5.8.7 och Kr\u00f6kningsmetoden 5.8.8.<\/p>\n

Fr\u00e5gor forts\u00e4tter att komma in till v\u00e5r support g\u00e4llande vilken metod som b\u00f6r anv\u00e4ndas och om olika metoder kan kombineras n\u00e4r det g\u00e4ller instabilitet i olika riktningar varf\u00f6r det kan vara p\u00e5 sin plats med ytterligare en betraktelse \u00f6ver \u00e4mnet.<\/p>\n

Vilken metod som skall anv\u00e4ndas \u00e4r givetvis upp till anv\u00e4ndaren. Alla tre metoderna \u00e4r till\u00e5tna enligt det svenska annexet. Den Generella metoden f\u00e5r ses som den mest avancerade. D\u00e4r g\u00f6rs en verklig 2:a ordningens analys samtidigt som en icke-linj\u00e4r ber\u00e4kning utf\u00f6rs \u00f6ver hur styvheten p\u00e5verkas av betongens uppsprickning. De tv\u00e5 \u00f6vriga metoderna \u00e4r f\u00f6renklade metoder d\u00e4r ett 2:a ordningens moment ber\u00e4knas med formler som kalibrerats fram med hj\u00e4lp av den Generella metoden.<\/p>\n

Som n\u00e4mndes tidigare kan man f\u00e5 ganska olika resultat beroende p\u00e5 det aktuella exemplet. Styvhetsmetoden \u00e4r tex mycket beroende av andelen armering s\u00e5 vid en liten armeringsprocent kan betydligt l\u00e4gre kapacitet erh\u00e5llas f\u00f6r den metoden j\u00e4mf\u00f6rt med \u00f6vriga men om armeringen \u00f6kas kommer resultatet f\u00f6r den metoden oftast i niv\u00e5 med \u00f6vriga. Det \u00e4r viktigt att \u00e4ven ta h\u00e4nsyn till det effektiva kryptalet och ofta har detta n\u00e5got st\u00f6rre inverkan p\u00e5 Styvhets- och den Generella metoden \u00e4n Kr\u00f6kningsmetoden.<\/p>\n

N\u00e4r det g\u00e4ller WIN-Statik s\u00e5 kan tv\u00e5 program hantera b\u00f6jkn\u00e4ckning av betong, Concrete Column och Frame Analysis. Med Concrete Column kan ber\u00e4kningar enligt de b\u00e5da f\u00f6renklade metoderna utf\u00f6ras medan Frame Analysis kan hantera alla tre.<\/p>\n

Ex: F\u00f6r att belysa hur det kan se ut studerar vi en betongpelare 700×700 mm med l\u00e4ngden 12m.<\/p>\n

\"tips<\/p>\n

Armeringsinneh\u00e5llet \u00e4r 12 st\u00e4nger med diameter 16 mm dvs 2413 mm2 eller 0.492%.<\/p>\n

Om styvhetsmetoden v\u00e4lj erh\u00e5lls kapaciteten 4865 kN.<\/p>\n

\"tips<\/p>\n

Om ist\u00e4llet kr\u00f6kningsmetoden anv\u00e4nds erh\u00e5lls kapaciteten 13250 kN.<\/p>\n

\"tips<\/p>\n

Om slutligen den generella metoden anv\u00e4nds i planet s\u00e5 blir kapaciteten 9265 kN. Ut ur planet m\u00e5ste en av de f\u00f6renklade metoderna anv\u00e4ndas, i detta fall Styvhetsmetoden.<\/p>\n

\"tips<\/p>\n

\"tips<\/p>\n

Om effektiva kryptalet \u00f6kas till 2.0 h\u00e4nder f\u00f6ljande:<\/p>\n

Kapaciteten f\u00f6r Styvhetsmetoden minskar till 3750 kN dvs med 23%. F\u00f6r Kr\u00f6kningsmetoden g\u00e4ller 12500 kN en minskning med 5.3% och slutligen Generella metoden ger 7835 kN en minskning 15.4%.<\/p>\n

Vi g\u00e5r tillbaka till effektiva kryptalet 1.2 och \u00f6kar armeringen kraftigt till 44 st\u00e4nger med diameter 25 mm dvs 21600 mm2 eller 4.4%.<\/p>\n

\"tips<\/p>\n

Styvhetsmetoden ger nu 17880 kN en \u00f6kning med 367 % fr\u00e5n ursprungsv\u00e4rdet 4865 kN. Kr\u00f6kningsmetoden ger 19900 kN en \u00f6kning med ca 50% allts\u00e5 fortfarande n\u00e5got gynnsammare \u00e4n Styvhetsmetoden men nu \u00e4r skillnaden bara ca 10%. I det h\u00e4r fallet ger Generella metoden l\u00e4gst kapacitet 15415 kN en \u00f6kning med ca 63 %.<\/p>\n

De olika metoderna kan allts\u00e5 sl\u00e5 ganska olika och i det h\u00e4r fallet var det Kr\u00f6kningsmetoden som var mest gynnsam men det beh\u00f6ver inte alltid vara s\u00e5. D\u00e4remot \u00e4r det v\u00e5r erfarenhet att vid l\u00e5g armeringsprocent \u00e4r normalt Styvhetsmetoden den mest ogynnsamma och att det effektiva kryptalet oftast p\u00e5verkar Styvhetsmetoden och den Generella metoden n\u00e5got mer.<\/p>\n

Det \u00e4r ocks\u00e5 v\u00e5r erfarenhet att flest ber\u00e4kningar g\u00f6rs med 2ordningens analys vilket inneb\u00e4r den Generella metoden i planet och sedan Styvhets- eller Kr\u00f6kningsmetoden efter anv\u00e4ndarens val ut ur planet.<\/p>\n<\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":12,"featured_media":18236,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[301,353],"tags":[],"class_list":["post-18368","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog-sv-2","category-win-statik-sv-2"],"acf":[],"yoast_head":"\nB\u00f6jkn\u00e4ckning av betong. 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