复合筋增强UHPC预制节段拼装桥墩抗震性能研究

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中图分类号：TU2 文献标志码：A

Seismic performance of hybrid-reinforced UHPC precast segmental bridge piers

LI Zhangpeng，DONG Chao，LI Mingshuo，WANG Yuhang，LI Yue （School of Civil Engineering，North China University of Technology，Beijing 1O0144，China）

Abstract： To enhance the seismic performance of coastal precast segmental bridge piers，this study proposes a hybrid-reinforced ultra-high performance concrete （UHPC）segmental bridge pier system incorporating stainless steel barsand glass fiber reinforced plastic（GFRP）tendons.Numerical simulations investigate theefctsof UHPC compressive strength，stainless steel reinforcement ratio，and initial GFRP prestress on structural behavior.Results demonstrate that：（1） Increasing UHPC compressive strength from 10O MPa to 160 MPa elevates load -bearing capacity by 19.6% ，though marginal enhancement diminishes beyond 130MPa （2）Raising reinforcement ratio from 0.8% to 1.6% boosts cumulative energy dissipation by 72% ，confirming seismic resistance optimization within this range.（3） Higher initial GFRP prestress enhances self-centering capability but inhibits the rocking mechanism when exceeding thresholds.The optimal design is determined as 130MPa UHPC， 1.2% stainless steel reinforcement ratio，and 50% ultimate strength GFRP prestress.

Key Words：precast segmental bridge pier； UHPC； stainless steel bar; GFRP tendon；seismic performance

预制节段拼装桥墩凭借模块化施工和环保优势，在连续梁桥中应用广泛。（剩余10026字）