HRB600鋼筋鋼纖維混凝土梁柱邊節(jié)點抗震性能試驗研究

張健新 張標 丁傳林

摘要：為減小配置HRB600鋼筋梁柱邊節(jié)點的梁筋粘結(jié)退化，設(shè)計鋼纖維整體增強或局部增強的梁柱邊節(jié)點，進行兩個配置HRB600/HRB400鋼筋混凝土梁柱邊節(jié)點和2個配置HRB600高強鋼筋的鋼纖維整體增強或局部增強的混凝土梁柱邊節(jié)點的低周往復荷載試驗，得到試件的破壞形態(tài)和滯回曲線，對比分析邊節(jié)點的耗能能力、延性性能、核心區(qū)剪切變形和梁筋粘結(jié)退化。結(jié)果表明：往復荷載下HRB600鋼筋混凝土節(jié)點具有較高的承載能力、耗能能力和延性性能，但HRB600鋼筋與普通混凝土粘結(jié)退化過快;鋼纖維整體增強或局部增強混凝土的措施可以減緩HRB600梁筋粘結(jié)退化，改善邊節(jié)點的破壞形態(tài)，減小核心區(qū)的剪切變形，提高耗能能力;鋼纖維整體增強的梁柱邊節(jié)點具有更高的延性性能和耗能能力，其HRB600梁筋粘結(jié)退化更為緩慢。

關(guān)鍵詞：梁柱邊節(jié)點;HRB600鋼筋;鋼纖維混凝土;抗震性能

中圖分類號：TU375.4 文獻標志碼：A 文章編號：20966717（2020）04010508

收稿日期：20191014

基金項目：河北省自然科學基金（E2018202290、E2019202064）;河北省高層次人才資助項目（B2017003003）

作者簡介：張健新（1986 ），女，博士，主要從事結(jié)構(gòu)抗震研究，Email： zhangjianxin505@126.com。

Received：20191014

Foundation items：Natural Science Foundation of Hebei Province （No. E2018202290，E2019202064）; HighLevel Talents Project of Hebei Province （B2017003003）

Author brief：Zhang Jianxin （1986 ）， PhD， main research interest： structure seismic， Email： zhangjianxin505@126.com.

Experimental analysis on seismic behavior of steel fiber concrete beamcolumn exterior joints with HRB600 reinforcement bars

Zhang Jianxin， Zhang Biao， Ding Chuanlin

（School of Civil and Transportation Engineering， Hebei University of Technology， Tianjin 300401， P.R. China）

Abstract： In order to reduce the bond degradation of beam reinforcement bars in beamcolumn exterior joints with HRB600 reinforcement bars， the beamcolumn exterior joints with overall or local steel fiber concrete were designed. The lowcycle loading tests were carried out on two ordinary concrete beamcolumn exterior joint with HRB600/HRB400 reinforcement bars， and two steel fiber concrete beamcolumn exterior joints with overall or local steel fiber concrete and HRB600 reinforcement bars. The failure modes， hysteresis curves， energy dissipation， ductility， shear deformation in the core zone and bond degradation of beam reinforcement bars were analyzed. The research results showed that the joints with HRB600 reinforcement bars exhibited higher bearing capacity， energy dissipation capacity and ductility under lowcycle loading， but the bond degradation between HRB600 reinforcement bar and ordinary concrete degraded too quickly. The exterior joint reinforced by overall or local steel fiber concrete exhibited slower bond degradation of HRB600 beam reinforcement bars， slighter failure mode， smaller shear deformation in the joint core area， and larger energy dissipation capacity. The beamcolumn exterior joint with overall steel fiber concrete had higher ductility and energy dissipation capacity compared with the beamcolumn exterior joint with local steel fiber concrete， and the bond degradation of HRB600 beam bars was slower.

Keywords：exterior beamcolumn joint; HRB600 reinforcement bars; steel fiber concrete; seismic behavior

隨著高性能結(jié)構(gòu)的發(fā)展，普通鋼筋混凝土結(jié)構(gòu)已經(jīng)很難滿足現(xiàn)代化結(jié)構(gòu)的要求，許多學者關(guān)注高強鋼筋高性能混凝土結(jié)構(gòu)的研究[12]。作為混凝土結(jié)構(gòu)關(guān)鍵部位的梁柱節(jié)點，其抗震需求較高，因此，需要配置足夠數(shù)量的鋼筋，由此導致節(jié)點區(qū)域鋼筋密集。特別是梁柱邊節(jié)點，梁縱筋在節(jié)點區(qū)域彎折錨固致使節(jié)點區(qū)域鋼筋密集，澆筑混凝土容易擁堵而不容易密實[34]。……