标准规范下载简介

7 Externalcornerprofil

The external corner profile of a square or rectangular hollow section shall be measured according to 7.7.2 or 7.7.3 at the discretion of the manufacturer. 7.7.2The corner arc shall be measured with a radius gauge.

7.7.3The distance between the intersection of the flat side and the corner arc and the interse projections of the flat sides to the corner (C and C, in Figure 4) shall be measured.

DB34／T 3324-2019 建设工程声像信息服务规范utside corner profile of square or rectangular hollow

against the surface. At the opposite end of the hollow section the difference in height of the two lower corners from the horizontal surface (see Figure 5) shallbe determined

e5Twistofsquareorrectangularhollowsections

7.8.3 The twist shallbe measured with a spirit level and micrometer gauge (screw). The refereno the spirit level shall be the distance between the intersection of the fiat sides and the corner Figure 6). The twist Vis the difference between the values V, (see Figure 6) measured at each hollowsection

.0.3 The twist shall be measured with a spirit level and micrometer gauge (screw). The reference length of the spirit level shall be the distance between the intersection of the flat sides and the corner arcs (see Figure 6). The twist V is the difference between the values V, (see Figure 6) measured at each end of the hollowsection

7.9Straightness

7.9Straightness

The deviation from straightness (e) of the total length of a hollow section shall be measured at the poin maximum departure of the hollow section from a straight line connecting its two ends, as shown in Figur where L is the manufacturer's delivered length. The percentage deviation from straightness shall be calcula asfollows

from a straight line length L of 1 m, shall be not more than 3 mm

The nominal sectional properties of hollow sections within the scope of this part of EN 10219 and manufactured to the dimensional tolerances of this standard, required for the purposes of structural design, shall be calculated in accordance with Annex B. The sectional properties for a limited range of standard sizes of coldformed hollow sections are given in Table C.1 for circular sections, Table C.2 for square sections and Table C.3 for rectangular sections. These sectional properties were calculated from the formulae given in Annex B.

enominal sectional properties of hollow sections within the scope of this part of EN 10219 and nufactured to the dimensional tolerances of this standard, required for the purposes of structural design, allbecalculated inaccordancewithAnnexB. e sectional properties for a limited range of standard sizes of cold formed hollow sections are given in Table for circular sections, Table C.2 for square sections and Table C.3 for rectangular sections. These ctional properties were calculated from the formulae given in Annex B.

A.1 General

AnnexA (informative)

Additionaltolerancesforpilingtube

A.2Outof roundness tolerance

TableA.1 Maximumpermittedvaiues Dimensions inmm

A.3Accidentaleccentricity tolerance

accidental eccentricity ea should satisfy thecondition

eccentricity es,ma

A.4Dimpletolerance

The depth of initial dimples in the tube wall w。 is measured, in both the meridontal and circumferential directions, using a measurement gauge, see Figure A.3, of length Ig where: a)meridontally and circumferentially lg= 4/rT b)across welds lg = 25 T but l, ≤ 500 mm The gauge used for meridontal measurements should be straight but that used for measurements in the circumferentialdirection should havea radius of curvature rwhere 2

Dimensions in mm

B.1 General

Annex B (normative)

aeforthecalculationofsectionalprop

Iables C.1, C.2 and C.3 of this standard give nominal sectional properties for a limited range of sizes of cold formed hollow sections.The nominal sectional properties of holiow sections supplied to the requirements of this standard shall be calculated using the formulae given below. NOTE The designation of the sections' major axis (y) and its minor axis (zz) align with the axis designation used for structural design in the structural Eurocodes. This is a change from previous axis desionations

bles C.1, C.2 and C.3 of this standard give nominal sectional properties for a limited range of sizes of cold med hollow sections. The nominal sectional properties of holiow sections supplied to the requirements of s standard shall be calculated using theformulae given below. TE The designation of the sections' major axis (y) and its minor axis (zz) align with the axis designation used for uctural design in the structural Eurocodes. This is a change from previous axis designations

B.2 Circular hollow sections

Ine sectional properties for circular hollow sections in Table C.1 are calculated using the formulae given below.

B.3Rectangular,orsquare,hollowsections

pupericial area per metre lengtr

Mass per unit length Second moment of area

(cm) (cm")

K=2A. h R=o+r 2

DBJ／T15-168-2019 广东省建筑节能管理信息数据元Sectionalpropertiesforalimitedrangeofstandardsizes

able Nominaldime sections (see Figure C.1)

Figure C.2Square hollow section

mensions and sectional properties of a limited range sections (see Figure C.3)

Bibliography

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BSI is theindependent national body responsibleforpreparing British Standards.It presents the UK view on standards in Europe and at the international level.It is incorporatedbyRoyalCharter.