RC構架含開口填充磚牆之側力位移曲線預測

Abstract

過去的實驗研究表示，填充磚牆具有顯著的側向強度，而這一貢獻在結構耐震評估中常被保守地忽略。本研究提出了一種新的側力位移曲線公式，整合了先前的研究成果，適用於各種填充磚牆配置：包括四面圍束、三面圍束，以及開口牆（含補強與未補強）。研究採用曲線疊加法來獲得填充磚牆的整體側力位移曲線。結果顯示，先砌填充磚牆與後砌填充磚牆在強度和勁度方面存在顯著差異。雖然本文提出的側力位移曲線總體上能很好地預測填充磚牆試體的行為，但部分試體（尤其是後砌填充磚牆試體）的強度被高估了。本研究建議改進強度公式，以考慮後砌填充磚牆不同的破壞路徑，尤其是在負向側力作用下或側力先作用於磚牆時。

Past experimental studies have demonstrated that brick infill walls possess significant lateral strength, a contribution often conservatively neglected in seismic evaluation. This study proposes new formulations for lateral load-deflection curves, integrating findings from previous research, applicable to various brick infill configurations: four-sided confined, three-sided confined, and walls with openings (with and without retrofit). The method of curves superposition is used to obtain the overall lateral load-deflection curves for brick infill walls. The results reveal a notable difference in strength and stiffness between pre-laid and post-laid brick infill walls. While the proposed lateral load-deflection curve generally predicts the behavior of the brick infill specimens well, strengths of some specimens, particularly post-laid brick infill specimens are found to be overestimated. This study recommends refining the strength formulations to account for the distinct failure mechanisms observed in post-laid brick infill, particularly under negative loading conditions or when the load strikes the brick wall first.