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Seismic Reliability of Code-Conforming Italian Buildings

机译：符合规范的意大利建筑的抗震可靠性

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摘要

This paper presents and discusses some research results related to the seismic failure risk of standard, residential and industrial, buildings designed for damage, and life-safety according to the Italian seismic code, which is somewhat similar to Eurocode 8. The five considered structural typologies are as follows: masonry, cast-in-place reinforced concrete, precast reinforced concrete, steel, and base-isolated buildings. The archetype structures have been designed according to standard practice at three sites, representative of the seismic hazard across the country. Seismic risk is defined here as the annual rate of earthquakes able to cause structural failure in terms of usability-preventing damage and global collapse. For each structure, the failure rates have been evaluated in the framework of performance-based earthquake engineering, that is, via integration of site's probabilistic hazard and structural fragility. The former has been computed consistently with the official hazard model for Italy that is also used to define design actions in the code. The latter has been addressed via nonlinear dynamic analysis of three-dimensional numerical structural models. Results indicate that, generally, design procedures are such that seismic structural reliability tends to decrease with increasing seismic hazard of the building site, despite the homogeneous return period of exceedance of the design seismic ground-motion.
机译：本文介绍并讨论了根据意大利地震法规（类似于欧洲法规8）与标准，住宅和工业，为损坏而设计的建筑物以及生命安全相关的地震破坏风险的一些研究结果。五种被认为是结构类型如下：砖石，现浇钢筋混凝土，预制钢筋混凝土，钢和基础隔离建筑物。原型结构是根据标准实践在三个地点设计的，代表了全国的地震灾害。此处，地震风险是指在防止可用性受损和全球性崩溃方面能够引起结构性破坏的年地震率。对于每个结构，已经在基于性能的地震工程框架中评估了失效率，即通过综合现场的概率危险和结构脆弱性来进行评估。前者的计算方法与意大利官方的危害模型一致，后者也用于定义法规中的设计措施。后者已通过三维数值结构模型的非线性动力学分析得到解决。结果表明，总体而言，尽管超过了设计地震地面运动的均匀返回期，但设计程序通常仍会随着建筑工地地震危险的增加而降低地震结构的可靠性。

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