纖維強化塑膠與活性粉混凝土複合梁力學行為

Abstract

FRP在橋梁工程的應用已日趨重要，而FRP在國內工程的使用只有結構物的修補與補強等輔助功能，無法在建築設施中扮演主要的角色，著實浪費了FRP優異的特性。因此本論文利用FRP與活性粉混凝土在力學上的優點，將兩者予以複合，以橋面板的單位板帶－矩形梁作為主要試驗構件，探討FRP－活性粉混凝土複合梁力學性質，期待日後能對國內FRP－混凝土複合橋面板結構之發展能有所裨益。 本實驗包含三部份： （1) 基本材料性質試驗：包括FRP拉伸試驗、FRP抗彎試驗、活性粉混凝土抗壓試驗。 （2）三點單向靜態彎曲試驗：探討各梁之間破壞模式、極限荷載以及力量－變位關係。 （3）FRP與活性粉混凝土界面複合情形：探討FRP－活性粉混凝土複合梁變形行為與兩者之間的滑移量。 由（2）和（3）的結果，便可得知在表面塗覆環氧樹脂否對FRP與活性粉混凝土複合後的力學性質有所助益。 實驗結果顯示，在FRP與活性粉混凝土界面使用環氧樹脂後： （1）破壞模式從類似延性破壞轉變成類似脆性破壞 。 （2）大幅度提升極限荷載以及其他力學性質，同時降低了變位量。 （3）改善了FRP－活性粉混凝土複合梁變形及滑移情況。

FRP is more and more important on the application of bridge engineering day by day,yet FRP only have auxiliary capability like structure repair and strengthening in the use of internal engineering.FRP can’t play an important role in the construction structure and really waste the excellent properties of it.Therefore,the thesis will make use of advantages of FRP and RPC in mechanics and combine them.We regard the units of deck－rectangular beam as the main testing component.Then we discuss the mechanical behavior of FRP-RPC composite beam and hope it can help the development of FRP-RPC composite deck in our country in the future. The experiment include three parts： （1）Basic material property experiment：Standard test methods for tensile properties of fiber reinforced plastics；Standard test methods for flexural properties of fiber reinforced plastics；Standard test methods for compressive properties of reactive powder concrete. （2）The three point bending flexural test：we discuss failure mode、 ultimate load and load-deflection curve between each beam. （3）The interface composite situation between FRP and RPC：we discuss composite behavior of FRP-RPC composite beam and slippage between FRP and RPC. With the result of（2）and（3）,we can know apply epoxy to FRP whether it can help the mechanical property of FRP-RPC composite beam. After using epoxy on the interface of FRP and RPC,the results of experiment display： （1）Failure mode change from similar ductility destruction to similar brittleness destruction. （2）It enhance ultimate load and other mechanical property by a large margin ,also reduce displacement of the neutral axis at the same time. （3）It improve transformation and slippage of FRP-RPC composite beam.