On strain of wooden houses measured by strain meter and criterion for earthquake-proof

Abstract

This article is to descrive how and what sort of strain and vibration come to pass when static force be given to wooden house and also to survey the state of proper vibration in order to study on relation between them and to establish the criterion for earthquake-proof of wooden houses. Principal results obtained are as follows: (1) There exists relation between strain Δx and ratio of moment of force k as follows: [Figure omitted] (2) The close relation exists between c and criterion for earthquake-proof. That is, the bigger the value of c, the higher grade of criterion for earthquake-proof. (3) The close relation exists between period T and grade of criterion. That is, the smaller the value of T, the higher grade of criterion. (i) In A-grade of criterion the value of T is less than 0.3 sec. (ii) In B-grade it is between 0.3 to 0.45 sec. (iii) In C-grade it is more than 0.45 sec. (4) The smaller the value of damping ratio ʋ, the higher grade of criterion. And there exists between c, T and ν as follows: [Figure omitted] Value of a seems to have no directly relation to the criterion but the term of solid friction ρ. That is, the bigger the value of ρ, the bigger the value of α.