ANSI-AISC 342-22 PDF下载

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ANSI/AISC 342-22《既有钢结构建筑抗震评定与加固规定》PDF下载
2022年9月发布,替代2018版,与AISC 360-22、AISC 341-22并行使用,专门解决**既有钢结构**在地震作用下的**安全评定与韧性加固**问题。规范适用于所有抗震设计类别(SDC A~F)的既有钢框架、支撑框架、组合框架及筒体结构,核心亮点包括:

1. 首次系统给出**“既有建筑抗震目标性能等级”**(Immediate Occupancy、Life Safety、Collapse Prevention)与**对应层间位移角限值**,可直接对接ASCE 41-23的线性/非线性分析路径;
2. 新增**“钢板-混凝土组合剪力墙”**(SC-SPW)与**屈曲约束支撑(BRB)**的**既有体系加固设计公式**,解决老旧钢框架刚度不足、延性缺乏的痛点;
3. 升级**“现场材料强度推定”**条款:允许采用**无损硬度法+钻芯法**综合确定钢材实际屈服强度,减少大规模取样对既有建筑运营的干扰;
4. 细化**“焊接加固”**与**“高强螺栓替换”**施工顺序:要求**先卸载、后加固、再回载**的三阶段控制,避免二次应力集中,确保加固节点在后续地震中形成可控塑性铰;
5. 引入**火灾后钢结构抗震评定附录**:结合AISC 360-22附录4,给出**临界温度折减系数**与**剩余延性评估方法**,为灾后快速复产提供量化依据。

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