裝配式高強鋼筋鋼纖維混凝土框架節點抗震性能試驗研究

張健新 丁傳林 戎賢 楊洪渭

摘 要： 為研究裝配式高強鋼筋鋼纖維混凝土框架節點的抗震性能，對2個預制裝配式混凝土節點試件和1個現澆普通混凝土節點試件進行低周往復荷載試驗，對比分析裝配式混凝土節點試件的破壞特征、滯回特性和耗能能力等抗震性能指標。結果表明：節點核心區加入工字鋼的裝配式高強鋼筋鋼纖維混凝土梁柱中節點試件發生梁端彎曲破壞，滿足“強柱弱梁”的抗震設計要求;普通現澆節點和采用鋼板焊接端板連接的節點均發生節點核心區剪切破壞，而裝配式混凝土節點核心區破壞程度較輕;在節點核心區及后澆區加入鋼纖維能減少裂縫寬度，延緩裂縫傳播，減輕核心區混凝土剝落程度，改善節點破壞形態;預制裝配式混凝土梁柱節點試件的極限荷載、滯回性能和耗能能力均得到提高，剛度退化得到減緩，從而改善預制混凝土框架節點的抗震性能。

關鍵詞： 裝配式框架節點;高強鋼筋;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：2096-6717（2020）02-0157-08

Experimental research on seismic behavior of the prefabricated frame joints with high strength reinforcement and steel fiber concrete

Zhang Jianxin， Ding Chuanlin， Rong Xian， Yang Hongwei

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

Abstract：? In order to study the seismic performance of the prefabricated frame joints with high strength reinforcement and steel fiber concrete， two precast concrete joints and one cast-in-situ concrete joint were conducted under low cyclic reversed load test， the failure characteristic， hysteretic behavior and energy dissipation were analyzed.The results show that the prefabricated beam-column interior joints with high strength reinforcement and steel fiber concrete， which the H-steel was adopted in joint core area， present bending failure of beam end， which meets the seismic design principle of “strong column and weak beam”.The cast-in-situ concrete joint and the joint connected by the steel plate welded end plates occur shear failure in the joint core zone， while the failure mode of prefabricated joint significantly improves.The use of steel fiber in core area and assembly segment can reduce the crack width and propagation， lighten concrete protection spalling and improve the damage pattern of joints.The ultimate load， hysteretic performance and energy dissipation capacity in the prefabricated beam-column joints are improved， the stiffness degradation is retarded and the seismic performance of prefabricated joints are improved.

Keywords： prefabricated frame joints; high strength reinforcement; steel fiber concrete; seismic behavior

預制裝配式混凝土構件是指在工廠中制造并在建筑工地裝配成整體構件的混凝土產品。與傳統的現澆混凝土結構相比，預制混凝土結構具有生產效率高、構件加工精度高、節能環保、施工進度快、經濟效益高等優點[1-2]。但是，預制裝配式混凝土剛度、整體性以及抗震性能差，大量研究表明，梁柱節點是影響預制結構抗震性能的關鍵因素[3-5]。為此，學者們對不同節點連接類型的預制裝配式混凝土結構進行了研究。……