ISO 3443-2:1979 PDF

Name: ISO 3443-2:1979 — Tolerances for building — Part 2: Statistical basis for predicting fit between components having a normal distribution of sizes
SKU: ISO 3443-2:1979
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Tolerances for building — Part 2: Statistical basis for predicting fit between components having a normal distribution of sizes

Название (английский):

ISO 3443-2:1979

Tolerances for building — Part 2: Statistical basis for predicting fit between components having a normal distribution of sizes

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 5
Дата публикации:: 1 июля 1979 г.
Издание:: ISO IS 3443 edition 1 version 1
ICS:: 91.200

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Описание (английский):

Describes the fundamental characteristics of dimensional variability in building and of the particular case of combination of random unrelated variables. Sets out the need to relate dimensional variability to the limits imposed on joint widths by the need for satisfactory functioning. Applies to all forms of building construction that have predictable variability which follows a Gaussian distribution.

Abstract

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Стандарты, упомянутые в описании

Overview

ISO 3443-2:1979 - "Tolerances for building - Part 2: Statistical basis for predicting fit between components having a normal distribution of sizes" provides the statistical foundation for assessing dimensional variability in building construction. The standard addresses how normally (Gaussian) distributed component sizes combine to determine joint widths and the probability of satisfactory fit or misfit in assemblies. It applies where component variability is predictable and approximately Gaussian.

Key topics

Normal (Gaussian) distribution: Defines the use of the mean and standard deviation to describe size distributions and shows the familiar probability limits (≈68.27%, 95.45%, 99.73% for ±1, ±2, ±3σ).

Combination of independent random variables: Uses the root-sum-square rule - the standard deviation of combined variability equals the square root of the sum of the squares of individual standard deviations - to predict total dimensional variability in assemblies.

Fit and joint width prediction: Relates predicted dimensional variability to allowable joint width limits (clearance or joint clearance) and quantifies the probability of exceeding minimum or maximum joint limits (misfit).

Probability of failure and confidence limits: Explains how to compute probabilities that joint limits will be infringed and describes estimating population parameters from samples with confidence intervals (e.g., 95% confidence).

Sampling and calculation (Annex): Provides practical methods for random sampling, computing arithmetic mean and standard deviation from observations, and guidance on representativeness of small site samples (includes a worked example).

Applications

Predicting joint clearances and the risk of misfit when assembling prefabricated elements or site-built components.

Selecting appropriate work sizes and specifying tolerances so that jointing techniques can perform satisfactorily.

Designing quality-control and inspection procedures (sample sizes, confidence limits) for tolerances in building manufacture and erection.

Evaluating compatibility between components from different suppliers and ensuring functional performance of joints.

Related standards

ISO 3207 - Statistical interpretation of data (confidence limits, sample sizing)

ISO 3443-1 and ISO 4464 - Other parts of the series covering principles, vocabulary, identification and relationship of tolerances

ISO 3443-2:1979 is essential when tolerancing decisions must be grounded in statistical reality-helping practitioners translate measured variability into reliable predictions of fit, joint performance, and acceptable risk.

ISO 3443-2:1979 PDF

Abstract

Похожие стандарты

Overview

Key topics

Applications

Who uses this standard

Related standards

Технические детали

ISO 3207:1975/Add 1:1978

Statistical interpretation of data — Determination of a statistical tolerance interval — Addendum 1

ISO 3443-1:1979

Tolerances for building — Part 1: Basic principles for evaluation and specification

ISO 4464:1980

Tolerances for building — Relationship between the different types of deviations and tolerances used for spec…