ABSTRACT

The Theodosian walls of Constantinople have suffered many partial destructions in their long-lasting life, often because of strong seismic events, undergoing subsequent reconstructions. With reference to the 1999 Kocaeli earthquake, the article illustrates a procedure implemented to understand the damages suffered by one of the towers (tower 19) of this magnificent piece of heritage, that had just been partially reconstructed in the framework of a large manutention and preservation program of the whole historic defensive system. The seismic action on the tower was calculated considering local seismic site amplification, and the seismic behaviour of the masonry tower was analysed taking into account dynamic soil-structure interaction. Based on the available level of knowledge, the seismic demand of the tower is first evaluated by the classical modal response analysis and then by a linear time domain approach. Under both situations, the comparison between the compliant and the fixed base models allowed to recognize the detrimental effect of Soil Structure Interaction (SSI). Furthermore, the dynamic linear analysis allowed to detect the mechanism of earthquake induced triggering damage into the masonry panels.

摘要

君士坦丁堡的狄奥多西城墙在其长期的寿命中遭受了许多部分破坏，通常是由于强烈的地震事件，随后进行了重建。参考 1999 年科贾埃利地震，文章阐述了一个程序，以了解这座宏伟遗产的其中一座塔（19 号塔）遭受的损害，该遗产刚刚在大型维护和保护的框架内进行了部分重建整个历史防御体系的计划。计算了考虑局部地震场地放大的塔的地震作用，并分析了考虑动态土-结构相互作用的砌体塔的地震行为。根据现有的知识水平，塔的抗震需求首先通过经典的模态响应分析进行评估，然后通过线性时域方法进行评估。在这两种情况下，兼容和固定基础模型之间的比较允许识别土壤结构相互作用 (SSI) 的不利影响。此外，动态线性分析允许检测地震诱发的砌体面板破坏的机制。