GB/T 32076.2-2015High-strength structural bolting assemblies for preloading—Part 2: Suitability for preloading (English PDF)

1 Scope

GB/T 32076 provisions of this part of the pre-load of high-strength structural bolting connections made (hereinafter referred to as bolted connections made) technical requirements and test

Test methods, to ensure that the metal structure bolted connection of the sub preload adaptability.

Preload provides adaptive test methods checked bolted connection of the sub features, to ensure that meet the requirements of the method according to tighten the relevant provisions of

Preload and adequate safety factor to prevent the ultra-twist or break.

This section applies to industrial and civil construction, bridge, tower mast structure, boiler steel structure, lifting machinery and other steel structures preload connection

The high strength bolts.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein

Member. For undated references, the latest edition (including any amendments) applies to this document.

GB/T 32076.1 preload of high strength bolted connection structure Vice - Part 1. General requirements

GB/T 32076.3 preload high-strength structural bolting connection deputy Part 3. HR type hexagon bolts and nuts deputy

GB/T 32076.4 preload high-strength structural bolting connection deputy Part 4. HV type hexagon bolts and nuts deputy

GB/T 32076.5 preload of high strength bolted connection structure Vice - Part 5. Plain washers

GB/T 32076.6 preload of high strength connection of the sub section 6 bolted structure. chamfered flat washer

GB/T 32076.7 preload of high strength bolted connection structure Vice - Part 7. M39 ~ M64 hexagon bolts and nuts even

Then deputy

3 Terms and Definitions

Terms and definitions GB/T 32076.1 defined apply to this document.

Code and Unit 4

Elongation A machined specimen,%;

As, Nominal thread nominal stress area, mm2;

d Nominal thread diameter, mm;

Fb test bolt axial force, kN;

Fbi single bolt axial force value (and the nut is rotated, torque or bolt elongation related), kN;

Fbm Fbi mean value, kN;

Fbimax test, the maximum axial force of the bolt reaches a value, kN;

Fp predetermined preload value is 0.7RmAs, kN;

Nominal tensile strength Rm, MPa;

k coefficient of torque;

Single value ki torque coefficient;