基于性能的耐久性损伤RC构件时变抗震设计方法研究

Performance-based time-varying aseismic design method for durability damaged RC members

采用基于性能的抗震设计方法,考虑典型耐久性环境的影响,以及时变地震作用,探讨基于性能的耐久性损伤钢筋混凝土构件时变抗震设计方法。通过构件变形能力进行量化处理,建立了使用年限内典型耐久性环境下,构件破损指标、相对受压区高度、配箍特征值及曲率延性的量化关系式。对耐久性退化钢筋混凝土构件抗震设计时,应根据使用年限及耐久性环境,通过性能目标来调整构件设计要求,建议对规范配箍特征值、最小配筋率及相对界限受压区高度等抗震设计指标进行调整。以一般大气环境为例,给出了典型耐久性环境下,构件抗震设计时的最小配筋率和最小配箍率调整系数,以及不同抗震等级下的相对受压区高度在不同设计使用年限内的限值要求。

Applying the performance-based aseismic design method,considering influences of typical durability environment and time-varying earthquake action,the performance-based time-varying aseismic design method for durability damaged RC members was explored. Through quantified processing of panels ' deformation ability,under the typical durability environment within the design working life,the quantified relation expressions among panels' damage indexes,relative height of compression zone,stirrup characteristic value and curvature ductility were established. In RC member aseismic durability design,the design demands were adjusted to meet performance objective requirements according to the durability environment and design working life. So,the aseismic design indexes,such as,stirrup characteristic value,minimum reinforcement ratio and relative height of compression zone were adjusted. Their adjusting coefficients for different design working lifes under the common atmosphere environment were given.