Abstract
摘要:921地震發生後,國內許多日式木構造古蹟與歷史建築均受到不同程度損壞,在幾種主要震害損壞類型中以接頭型破壞最為常見。然而由於過去缺乏木接頭力學相關之科學性研究,以致於造成對木接頭耐震修復補強束手無策,雖然國內近年來投入相當的經費進行古蹟與歷史建築的修復保存工作,但是這些修復補強後的古蹟與歷史建築,是否能達到耐久與耐震的效果引發許多質疑。本計畫預定進行的三年期間,第一年度從94年8月1日至95年7月31日,題目為日式古蹟及歷史建築單一接頭力學性質測試與理論驗證,研究初步為針對台灣本土日式建築最常見的七種接頭進行資料收集,收集其基本的斷面尺寸以及材料特性資料,然後進行單一接頭試體規劃並藉由試驗來究明單一接頭其抗拉、抗彎、抗剪等之力學行為,然後以有限元素方法與力學分析軟體進行其力學行為的數值模擬,待建立基本台灣本土日式古蹟及歷史建築單一接頭的資料庫後,第二年從95年8月1日至96年7月31日,研究則是日式古蹟及歷史建築木構架接頭力學性質測試與理論驗證,這階段的研究重點為進行木構架接頭力學行為的探討,由於大部分的接頭皆為半剛性,且其行為又具有非線性、非彈性的特性,因此更增加了模擬
Abstract: After the 921 earthquake, a lot of the historical buildings in Taiwan were seriously damaged because of the failure of timber joints. Due to the few research results of mechanical behavior of timber frame joints in the past, the anti-seismic restoration of timber frame joints was to feel quite helpless. Although the government spent much man power and a lot of money for restoration of historical buildings, the durability and anti-seismic effects were quite questionable.
The research projects will start on 2005 and end on 2007. In the first year, the title is Experimental test and theoretical verification of timber joint on Japanese historical buildings. We will collect the common 7 types of timber joints to understand the cross sections and material properties, then we will fabricate models of timber joints and tension, shear and bending properties of timber joints will be investigated for better understanding the mechanical behavior of timber joints. After understanding the mechanical behavior of timber joints, we will verify the mechanical behavior by using FEM (Finite element Method) and theoretical method to simulate and establish the data base of timber joints.
In the second year, the title is Experimental test and theoretical verification of timber frame on Japanese historical buildings. In this year, we will investigate the mechanical behavior of timber frame connections. It is difficult to analyze the mechanical behavior of timber frame connections because most of the connections are semi-rigid joint and the mechanical behavior of joints is nonlinear and inelastic. In order to overcome these problems, we will try to use both theory analysis and experimental tests to investigate the mechanical behavior of timber frame connections and establish a serious of analytic models for timber frame connections. We also hope, the established models could predict the mechanical behavior of timber frame connections when the structure system is bearing force. The mechanical behavior of timber frame connections is very important for structure analysis. In this year, cyclic loading tests will be adopted to investigate full scale timber frame for better understanding the mechanical behavior. After that, we will use both theory analysis and experimental results to derive stiffness mechanical formula that will be used for the structure analysis.
In the third year, the title is Experimental test and theoretical verification of seismic retrofitted timber frame on Japanese historical buildings. The main purpose of this year is to investigate the seismic retrofitting possibilities for timber frame joints by using CFRP sheets and metal plates on Japanese historical buildings. We will use both theory analysis and numerical simulation to investigate the mechanical formula of stiffness that could be as a basis for the restoration of our historical buildings.
Keyword(s)
古蹟與歷史建築
木接頭
修復
Historical buildings
Timber joint
Restoration