應用於鋼筋混凝土建築物之純壓雙核心自復位斜撐發展與驗證

Abstract

近年來為改善鋼筋混凝土框構架之耐震性能，鋼斜撐補強廣泛應用在補強工法中，然而受限於鋼筋混凝土拉壓性能的差異，且鋼斜撐會發展顯著軸力，易使相鄰鋼筋混凝土構件承受複雜且不利之載重條件，則將逐步削減鋼斜撐原先設計性能。本研究透過改良鍾秉庭(2014)交錨型雙核心自復位斜撐，研發新型純壓雙核心自復位斜撐，使其擁有只受軸壓力的特性，並且保有雙核心自復位斜撐之零殘餘變形自復位能力以及斜撐的變形能力為傳統自復位斜撐的兩倍，能有效降低對拉力構件的線彈性變形量需求。本研究透過純壓雙核心自復位斜撐之力學行為，提出遲滯迴圈預測公式，並且利用有限元素分析(ABAQUS)加以驗證，接著進一步探討純壓雙核心自復位斜撐之預力大小、鋼筋號數、鋼筋長度參數研究，最後於國家地震工程研究中心進行一組實尺寸純壓雙核心自復位斜撐試驗(3.9 m長)，成功證明純壓雙核心自復位斜撐力學行為，且整體斜撐之實驗行為亦符合理論分析預測以及有限元素分析結果。

In recent years, in order to improve the ability of earthquake-resisting in reinforced concrete frame structure , steel brace is widely used in retrofit method.However, because of the concrete weak behavior under tension and high tension in steel brace , it casuses complex load and unfavorable condition between steel brace and reinforced concrete member.Also,the origin design performace will gradually reduced.In this study,we develop a new self-centering brace called compression only dual-core self-centering brace (C-SCB) , which only demonstrates compression mechanics behavior and preserve original self-centering ability through modifying conventional dual-core self-centering brace (SCB) proposed by chou and chung (2014).In this study, a proposed mechanics behavior formula of C-SCB has been verified by ABAQUS infinite element anlysis and test program.In order to understand the influence of different parameter such as pretension force 、rebar area and rebar length in C-SCB ,mechamics behavior formula has also been demonstrated in parameter study.The C-SCB(3.9meter) full scale test program was done in NCREE and successfully validate its kinematics and cyclic performance.