ABSTRACT

Damage surveys following to the Central Italy 2016 seismic swarm have shown that retrofitting or strengthening interventions on masonry buildings may result in unexpected seismic behaviour, which may be defined as hybrid. In fact, the insertion within the masonry of single parts aimed at activating the box-like behaviour can worsen the overall response like a vulnerability added to a building’s intrinsic ones. Existing procedures for post-earthquake visual assessment do not permit the definition of the behaviour of altered masonry buildings (substitution of horizontal structures, concrete curbs, injections, etc.). The article proposes a completion of the ‘knowledge path’ of an existing survey form adding a new part specifically dedicated to structural interventions. On-site data collection is performed by a digital survey form written in Google Forms. The analysis phase takes advantage of the features available in a Geographical Information System (GIS). The application of this survey form to about one hundred buildings in Castelsantangelo sul Nera (Macerata district, Central Italy) hit by the Oct. 26 and 30, 2016 quakes also helped to define the vulnerability classes for buildings with structural interventions. Empirical results show that either poor execution or conception of interventions can lead to the highest vulnerability classes.

摘要

2016 年意大利中部地震群之后的损害调查表明，对砖石建筑进行改造或加强干预可能会导致意外的地震行为，这可能被定义为混合地震。事实上，在砌体中插入旨在激活盒状行为的单个部件可能会使整体反应恶化，就像建筑物固有的脆弱性增加一样。现有的震后目视评估程序不允许定义改变的砖石建筑物的行为（替代水平结构、混凝土路缘石、注入等）。本文建议完成现有调查表的“知识路径”，增加一个专门用于结构干预的新部分。现场数据收集由用 Google 表单编写的数字调查表执行。分析阶段利用地理信息系统 (GIS) 中可用的功能。将此调查表应用于受 2016 年 10 月 26 日至 30 日地震袭击的 Castelsantangelo sul Nera（意大利中部马切拉塔区）的大约 100 座建筑物，也有助于确定具有结构干预措施的建筑物的脆弱性等级。实证结果表明，无论是执行不力还是干预措施的概念都可能导致最高的漏洞等级。2016 年的地震还有助于确定具有结构干预措施的建筑物的脆弱性等级。实证结果表明，无论是执行不力还是干预措施的概念都可能导致最高的漏洞等级。2016 年的地震还有助于确定具有结构干预措施的建筑物的脆弱性等级。实证结果表明，无论是执行不力还是干预措施的概念都可能导致最高的漏洞等级。