Timber roof structures have a strong influence on the behaviour of masonry buildings during earthquakes. In a seismic event, they may link walls and favour the development of a positive global response or they may suffer damage that can extend to masonry elements. From the perspective of risk mitigation, basic criteria and procedures for assessing the seismic vulnerability of timber roof structures are needed. After extended research, the main factors determining seismic vulnerability in such structures were identified. The steps of an assessment procedure developed within the research programme are discussed in this paper. The procedure comprises initial visual inspection for collecting data and information on the main parameters that are significant in seismic conditions, and their subsequent classification according to a grading system. Structural criticalities are thus identified, which may possibly be reduced. In the applications and case studies performed so far, the procedure has proven useful for focusing attention on the seismic qualification of timber structures that were originally conceived with regard to vertical loads.

中文翻译：

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木屋面结构的地震脆弱性评估：标准和程序

木屋面结构对砌体建筑物在地震中的行为有很大影响。在地震事件中，它们可能会连接墙壁并促进积极的全球响应的发展，或者它们可能会遭受可扩展到砌体元素的损坏。从风险缓解的角度来看，需要评估木屋面结构抗震脆弱性的基本标准和程序。经过深入研究，确定了决定此类结构地震脆弱性的主要因素。本文讨论了在研究计划中制定的评估程序的步骤。该程序包括最初的目视检查，用于收集在地震条件下重要的主要参数的数据和信息，然后根据分级系统对它们进行分类。因此，确定了可能会减少的结构临界点。在迄今为止进行的应用和案例研究中，该程序已被证明有助于将注意力集中在木结构的抗震鉴定上，这些木结构最初是针对垂直荷载而设想的。