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Theodosian墙在其长寿中遭受了许多局部破坏，通常是由于强烈的地震事件，随后进行了重建。关于1999年科贾埃利地震，本文举例说明了一种程序，用于了解这一宏伟遗产的其中一个塔（第19座）所遭受的破坏，该塔刚刚在大规模维护和保护的框架内进行了部分重建整个历史防御系统的程序。考虑局部地震场放大作用，计算了塔上的地震作用，并考虑了动态土-结构相互作用，对砖石塔的地震行为进行了分析。根据可用的知识水平，塔的地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。在两种情况下，柔顺模型和固定基础模型之间的比较都可以识别土壤结构相互作用（SSI）的有害影响。此外，动态线性分析可以检测地震引起的触发破坏的作用机制。