ASCE SEI 76-23 PDF下载

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ASCE/SEI 76-23 pdf download
《建筑物和其他结构不成比例倒塌潜在性缓解标准》(ASCE/SEI 76-23)pdf下载

该规范核心聚焦建筑物及其他结构的不成比例倒塌风险防控,为新建与既有结构应对燃气爆炸、车辆撞击、失控火灾等非预期异常事件,预防局部失效扩大为整体或大面积倒塌提供系统性技术指引,是制定结构抗倒塌设计方案、评估既有结构抗倒塌能力的权威依据,也是美国首部针对该领域的国家级建筑标准。

规范明确了不成比例倒塌缓解的核心实施流程,包括风险评估与规避(识别潜在威胁源及结构脆弱点)、性能目标设定(确保局部失效不引发连锁崩溃)、结构分析(涵盖强度、延性、变形能力及坚固性验算,避免超出极限状态)、设计与施工管控(材料选型、构造细节优化)、资格测试等关键环节,通过量化与定性结合的评估方法,判定结构在非预期荷载下的抗倒塌短板。在技术路径方面,提供特定于威胁(如针对爆炸、撞击等明确风险)与非特定于威胁(通用抗倒塌设计)两类方法,并明确直接设计(针对性强化关键构件)与间接设计(提升结构整体冗余度)两种核心思路,同时采用基于性能的设计框架,不强制规定构件具体参数,而是设定抗倒塌性能目标,赋予工程师灵活制定解决方案的自主权。

此外,规范充分考虑结构类型差异(覆盖ASCE 7《建筑物和其他结构的最小设计荷载和相关标准》所涉全部结构)、服役阶段(新建与既有结构差异化要求)及实际应用场景,在防控设计中平衡安全性与经济性,避免过度设计造成资源浪费,也防止防护不足引发安全事故。其技术内容与建筑荷载、结构设计等相关标准协同衔接,既保障结构在非预期异常事件下的稳定性,也为建筑规范制定、合同文件编制提供强制性技术依据,助力提升建筑物与基础设施的抗灾韧性,减少因局部失效导致的重大人员伤亡与财产损失。

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