## Abstract

A relationship between reliability indexes (β) and design points was calculated on limit states of structural bending members, second floor beam, third roof rafter and roof purlin. Effect on β of methods, by which parameters of empirical distributions were estimated, was investigated. Estimation methods were method of maximum likelihood, method of moments, least squares by linear model, least squares by non-linear model and Foschi's method. Empirical distributions were Normal, Log-normal, 2P Weibull and 3P Weibull distribution. And also design point of each member was compared to material strength and 5th percentile value with 75% confidence level (R_{0.05}) determined by a non-parametric method. The results are as follows: (1) The empirical distributions rather than estimation methods affected design points. (2) Values of design points calculated from four empirical distributions were almost the same when β is less than about 1.0 in case of 100% data fitting and when β is less than about 2.5 in case of lower 15% data fitting. (3) Design points of strength on the ultimate limit state were under R_{0.05} for species whose strength have a large variation. On the other hand they were about R_{0.05} for species whose strength have a small variation. (4) Design points of Young's modulus on serviceability limit state were a little under mean for all species except Sugi and were almost the same as recommended values by Architectural Institute of Japan.

Original language | English |
---|---|

Pages (from-to) | 32-36 |

Number of pages | 5 |

Journal | Mokuzai Gakkaishi/Journal of the Japan Wood Research Society |

Volume | 46 |

Issue number | 1 |

Publication status | Published - 2000 |

Externally published | Yes |

## Keywords

- Bending strength
- Design point
- Limit state design
- Reliability index

## ASJC Scopus subject areas

- Chemical Engineering(all)