CFRP筋轉(zhuǎn)換梁框支剪力墻抗震性能試驗的數(shù)值模擬仿真方法

吳世娟+江世永+陶帥+李雪陽

摘 要：對3榀CFRP筋轉(zhuǎn)換梁框支剪力墻進行了低周往復(fù)荷載試驗，并與1榀全鋼筋轉(zhuǎn)換梁框支剪力墻對比，分析了其破壞模式、受力特征和滯回特征等抗震性能。通過OpenSees分析平臺，選取基于剛度法理論的非線性梁柱單元，并結(jié)合零長度轉(zhuǎn)動彈簧單元，建立了合理考慮縱筋粘結(jié)滑移的CFRP筋轉(zhuǎn)換梁框支剪力墻數(shù)值分析模型。結(jié)果表明：考慮了縱筋粘結(jié)滑移的數(shù)值模型能較好地模擬CFRP筋轉(zhuǎn)換梁框支剪力墻在低周往復(fù)荷載作用下滯回曲線的捏縮特性，對試件屈服荷載和極限承載力也有較好的模擬精度。

關(guān)鍵詞：CFRP筋；框支剪力墻；抗震性能；粘結(jié)滑移

中圖分類號：TU375

文獻標(biāo)志碼：A 文章編號：1674-4764（2017）05-0016-07

Abstract：Three specimens of frame supported shear wall with CFRP bars in transfer beam were tested under low cyclic loading， comparing to one with steel bars. And the failure modes， stress characteristics and hysteretic characteristics were analyzed. The nonlinear beam column elements based on stiffness method and zero length rotational spring element were selected through the OpenSees analysis platform. A numerical analysis model was established to analyze the frame supported shear wall， reasonably considerating bond slip of longitudinal reinforcement， and the simulation results were compared with the experimental. The results showed that the numerical model considering the bond slip of longitudinal reinforcement， can well simulate pinch characteristics of hysteresis curve of frame supported shear wall under cyclic loads. Besides， the yield load and ultimate load also had preferable simulation accuracy.

Keywords：carbon fiber reinforced plastic（CFRP） bar； frame-supportedm shear wall； seismic performance； bond-slip

近年來，纖維增強塑料筋（fiber rein- forced plastic，簡稱FRP筋）因具有強度高、耐腐蝕等優(yōu)點而日益成為土木工程界的研究熱點之一。普通鋼筋往往由于混凝土抗裂性差而發(fā)生銹蝕，尤其是暴露在侵蝕環(huán)境下的鋼筋混凝土結(jié)構(gòu)，進而影響到結(jié)構(gòu)的安全性和耐久性[1]，因此，F(xiàn)RP筋成為了鋼筋的理想代替品。但FRP是一種線彈性材料，沒有屈服臺階，使得利用這種筋材的構(gòu)件存在脆性破壞等可能，從而影響結(jié)構(gòu)的抗震性能[2-3]。

隨著現(xiàn)代高層建筑的發(fā)展，轉(zhuǎn)換層結(jié)構(gòu)已廣泛應(yīng)用于實際工程中。如今，對普通鋼筋混凝土轉(zhuǎn)換梁的抗震性能已進行了大量的試驗研究和理論分析，例如祁勇等[4-5]、吳進進[6]以軸壓比、肢厚比、加腋高度等為參數(shù)，研究了框支短肢剪力墻結(jié)構(gòu)的破壞過程和耗能能力等抗震性能。……