防灾减灾工程学报2024，Vol.44Issue(3)：605-615,11.DOI:10.13409/j.cnki.jdpme.20221218001
UHPC增强短搭接RC构件承载力可靠度分析与加固建议
Reliability Analysis of Load Capacity of UHPC-Reinforced Short Lap-Spliced RC Components and Strengthening Recommendation
摘要
Abstract
This paper investigates the failure modes and load-bearing characteristics of Ultra-High Per-formance Concrete(UHPC)reinforced short lap-spliced RC components.The reinforcement mecha-nism of UHPC was firstly demonstrated,and a design space was established,incorporating key pa-rameters such as live-to-dead load ratio,lap-spliced coefficient m,UHPC strength,concrete strength,rebar type,and the bending moment effect ratio and axial force effect ratio considering hori-zontal seismic action.A performance function for analyzing the load-carrying reliability of RC compo-nents was established.The Monte Carlo method was applied to calculate reliability indices for critical parameter combinations within the design space,followed by a sensitivity analysis of key parameters and fitting of calculation results into zones.The results showed that among the key parameters in the design space,the lap-spliced coefficient,effect ratio,reinforcement ratio,rebar type and UHPC strength significantly influenced the reliability index.UHPC demonstrated excellent load-enhancing ca-pabilities and the ability to alter failure modes.Reliability indices of beam and column yield increased by 109.6％and 12.9％,respectively,with lap-spliced coefficients at yield of 0.58 and 0.57 respective-ly.For flexural RC beams(compression bending columns),when m＞0.67(0.65),the failure mode was steel reinforcement yielding,and UHPC reinforcement was recommended.When 0.50(0.49)＜m≤0.67(0.65),the failure mode was either reinforcement yielding or bond failure,so UHPC rein-forcement should be carefully employed.When m≤0.50(0.49),bond failure was likely,thus UHPC reinforcement was not recommended.关键词
短搭接/UHPC加固/可靠度/Monte Carlo法/承载力Key words
short lap-splice/UHPC reinforcement/reliability/Monte Carlo method/load-carrying capacity分类
建筑与水利引用本文复制引用
马高,马忍..UHPC增强短搭接RC构件承载力可靠度分析与加固建议[J].防灾减灾工程学报,2024,44(3):605-615,11.基金项目
国家自然科学基金项目(52278498)、湖湘青年英才计划项目(2021RC3041)资助 （52278498）
