桔木成因分析

Cause Analysis of Hanegi

桔木是一种典型的日本木结构古建筑构件。这篇论文从力学角度分析了设置于法起寺三重塔的桔木。唐代木结构建筑有两大典型特征:平缓的屋面和深远的出檐。当唐代的技术传入日本后,因为环境的不同而产生了新的问题。为了解决这些问题,日本先人们创造了双层屋面和桔木技术。桔木的主要功能是承担屋面荷载,并将这些荷载向下传递,与此同时将椽子从承担屋面荷载的重任中解脱出来。这是日本先人对中国技术巧妙的改进,在此过程中日本先人对中国技术的态度是尊崇而不盲从。

Hanegi is a structural timber typical for traditional Japanese architecture.This paper analyzes the hanegi installed in the pagoda at Hokiji from a structural perspective.The gentle sloped roof and the deep projecting eaves are two remarkable features of wooden buildings of the Chinese Tang dynasty.When those features were introduced to Japan,problems arose due to the different environment.To solve those problems,the Japanese builders created a double-layer roof and used hanegi.The main function of hanegi is to bear the weight of the roof and transmit the load downward,preventing the rafters from bearing load.This is an indigenous Japanese modification of technology from mainland China:Japanese were inspired by technology from China but not dependent on it.