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Dynamic Characteristics of 2-storied Conventional Wooden Houses with Eccentricity before and after Seismic Enhancement

2层传统偏心木屋抗震加固前后动力特性

基本信息

批准号：
15560510
负责人：
IMAOKA Katsuya
金额：
$ 2.37万
依托单位：
Toyota National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560510/
关键词：
Seismic Enhancement Wooden House Conventional Wooden House Oscillating Experiment Natural Frequency Damping Factor Roof Type Outer Wall Type 摩擦ダンパー付プレート偏心距離水平加振実験耐震診断

项目摘要

In this research there are two purposes, the 1st searching for the dynamic characteristics (natural frequency, natural mode shape, damping factor, etc.) of the 2 storied conventional wooden houses using the oscillating experiment, it classifying the roof and outer wall of the house, and evaluating for the relation with the wall area index of the first floor. The 2nd is evaluating for the effect of the seismic enhancement using oscillating experiment before and after enhancement.In two years, the oscillating experiment was carried out before and after enhancement about the 72 wooden houses built by 1981 and the following knowledge was acquired.(1) When the 2 storied conventional wooden house classifies a roof into four types, "a very heavy roof", "Japanese roof tile and clay", "Japanese roof tile only", and "light roofs, such as a slate,", and classifies an outer wall into three types of "wall clay", "siding board", and "mortar", the positive proportionality relation are found between the natural frequency and the wall area index of the first floor.(2) The natural frequency is so low that a roof is heavy at the same value of the wall area index.(3) When the wooden house is classified into the outer wall, the natural frequency of "mortar" type is higher than that of "wall clay" and "siding board" type.(4) When the earthquake resisting wall of the first floor is repaired or established newly, the natural frequency of the house becomes high.(5) When the earthquake resisting metal plate with a friction damper is attached to fix the column with the beam, the amplitude of the house becomes small and the damping factor increases.

本研究有两个目的，一是利用振动实验寻找两层传统木屋的动力特性（固有频率、固有振型、阻尼系数等），对房屋的屋顶和外墙进行分类，并评估与一层墙体面积指数的关系。第二个是通过增强前后的振动实验来评估抗震增强的效果。在两年内，对 1981 年建造的 72 栋木屋进行了增强前后的振动实验，并获得了以下知识。 (1) 当 2 层传统木屋将屋顶分为四种类型时，“非常重的屋顶”、“日本瓦和粘土”、“日本屋顶” 将外墙分为“墙体粘土”、“壁板”、“砂浆”三种，其固有频率与首层墙体面积指数成正比关系。(2)在墙体面积指数相同的情况下，固有频率较低，导致屋顶较重。(3)当木屋划分为外墙时，其固有频率为 “砂浆”型高于“墙粘土”和“墙板”型。（4）当首层抗震墙修缮或新建时，房屋的固有频率变高。（5）当附有摩擦阻尼器的抗震金属板与梁固定柱时，房屋的振幅变小，阻尼系数增大。