Poltidega ühendus
(1) struktuur tavaline polt ühendus
1, Vorm Ja Spetsifikatsioonid Of Tavalised poldid
tavaline vorm of the teras struktuur on a suur kuusnurkne pea tüüp, ja selle kood on tähistatud by the letter M with the nominal and diameter (mm). M18, M20, M22 and M24 are commonly used in engineering. Vastavalt to international standards, poldid on unified with bolt performance grades, such as "4.6", "8,8" and so on. The number before the decimal point näitab the lowest tensile of the bolt material, such as "4" for 40}0N/mm2 and "8" for 800N/mm2. The number after the decimal point (0.6, 0.8) näitab the yield ratio of the bolt material, that is, the ratio of the yield point to the lowest tensile strength.
Vastavalt to töötlemine täpsus of poldid, tavalised poldid on jagatud A, B, C kolm tase.
Class A and B bolts (refined bolts) are made of 8.8 grade steel and are turned by machine tools. The surface is smooth, the size is accurate, and Class I holes are used (that is, the bolt holes are drilled or redrilled on the assembled members, the hole walls are smooth and the holes are accurate). Because of its high processing precision, close contact with the hole wall, its connection deformation is small, good mechanical performance, can be used to withstand large shear and tension connection. However, manufacturing and installation are more laborious and costly, so they are less used in steel structures.
Klass C poldid (karedad poldid) on valmistatud 4,6 või 4,8 klass teras, töötlemine, suurus on mitte täpne piisavalt, ja ainult klass II augud on nõutav (see on, polt augud on augud augud sisse a üksik osa at a aeg või puuritud ilma a puur die. Üld ava on 1~2mm suurem kui polt varras läbimõõt). In the transfer shear force, the connection deformatsioon is large, but the performance of the transfer tension is good, the operation does not need special equipment, and the cost is low. It is commonly used in polt ühendused under tensile forces and in secondary shear connections in structures under static load or indirect dynamic loads.
2% 2C tavaline polt ühendus paigutus
(2) stress omadused tavaline polt ühendus
1. Nihe polt ühendus
2% 2C pinge polt ühendus
3, tõmbetugevus nihe polt ühendus
(3) Stress omadused kõrge tugevusega poldid
Kõrge tugevus polt ühendus saab olla jagatud hõõrdumine tüüp ja rõhk tüüp vastavalt to disain ja jõud nõuded. millal hõõrdumine tüüp ühendus on allutatud to nihke, väline nihke jõud jõuab maksimaalne võimalik hõõrdumine takistus vahel plaadid. millal suhteline libisemine toimub vahel plaadid, see on arvestatakse et ühendus on ebaõnnestunud ja on kahjustatud. Kui the pressure type connection is shear, the hõõrdumine on allowed to be over and the relative slip between the plates occur, and then the external force can continue to increase, and the final failure of the screw shear or the hole wall pressure that occur after is the the limit state.
