Material properties of historical masonry of the Frauenkirche and the masonry guideline for reconstruction

Pohle, F.; Jäger, Wolfram

doi:10.1016/s0950-0618(03)00062-x

Cited by 15 publications

(2 citation statements)

References 1 publication

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“…The church was bombed during World War II and was completely destroyed. The rubble was collected, after which the fragments were identified manually by hundreds of architects and the appearance was redesigned using computer graphics Pohle and Jager (2003); Collins et al (1993).…”

Section: Frauenkirche Dresdenmentioning

confidence: 99%

ISHIGAKI Retrieval System Using 3D Shape Matching and Combinatorial Optimization

et al. 2022

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In April 2016, a massive earthquake with a magnitude of 7.3 struck Kumamoto region, Japan, causing major devastation. One of the structures that were damaged in Kumamoto was Kumamoto Castle, a cultural asset of great significance in Japan. The stone retaining wall “ishigaki” that formed the foundation of the castle collapsed, and the superstructure was destroyed. The number of stones is estimated to be more than 70,000, and restoration work is anticipated to take more than 20 years. Since each of the stones is an important cultural asset, the broken stone structure needed to be restored to its original state in order not to lose its cultural value forever. In addition, the fallen stones need to be returned to their original positions in the ishigakis. In similar cases, non-automatic visual verification was used. However, for Kumamoto Castle, this would have been impossible because a large number of stones were displaced as a result of the collapse. The purpose of this project is to provide support for the restoration work by matching the stones that fell down after the collapse with those before the collapse using information technology, such as computer vision and optimization technologies. Specifically, we captured photographic images of the stones before and after the collapse to match them. The technical contributions of this study are as follows: (a) To estimate the scale and surface orientation of the stones, we exploit 3D model construction from the images. (b) To solve the jigsaw-puzzle-like problem of reassembling the stone fragments, we exploit the combination of a customized iterative closest point (ICP) algorithm for shape position matching and an assignment algorithm to find the best pairs of stones before and after the collapse by using the matching degree obtained from ICP. Here, only the 2D shape of the stones before the collapse can be used due to the small number of photos available. In contrast, a detailed 3D shape can be obtained from the stones after their collapse. We matched these asymmetric data in 2D and 3D to enable a comprehensive reconstruction. (c) We developed a user-friendly graphical user interface system that was used by actual masons without special knowledge. The developed system was used to match the ishigaki of a turret, Iidamaru. As a result, we succeeded in identifying 337 stones, or approximately 90% of the 370 images. These results are expected to be useful for and were used as a blueprint during actual restoration work.

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Section: Frauenkirche Dresdenmentioning

confidence: 99%

ISHIGAKI Retrieval System Using 3D Shape Matching and Combinatorial Optimization

et al. 2022

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“…Zbog toga se trebala obaviti odgovarajuća korekcija. U literaturi su opisana brojna nerazorna ispitivanja provedena na raznim povijesnim zidanim građevinama [25][26][27][28]. Iako bi se dobiveni parametri čvrstoće mogli uspoređivati s tim studijama i zatim tumačiti, teško je generalizirati kada se radi o povijesnim građevinama, jer se svaka od njih odlikuje specifičnim karakteristikama.…”

Section: Određivanje Parametara čVrstoće Zidovaunclassified

Istraživanje mehaničkih svojstava ziđa povijesnih zidanih građevina

Lakušić¹

2015

JCE

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Istraživanje mehaničkih svojstava ziđa povijesnih zidanih građevina U ovom se radu određuju mehanička svojstava ziđa povijesne palače Beylerbeyi. Primijenjen je posredan postupak jer vlasnik nije dopustio uobičajena ispitivanja. Na početku je određena mineraloška struktura prvobitno ugrađenog morta. Kasnije su pripremljeni i u laboratoriju ispitani uzorci morta i ziđa. Dobivena mehanička svojstva korigirana su dinamičkom identifikacijom da bi se odredio stvaran modul elastičnosti ziđa. U tu je svrhu obavljena analiza okolnih vibracija te je za palaču izrađen i podešen model konačnih elemenata. Na kraju su korigirani parametri čvrstoće ziđa. Investigation of mechanical properties of masonry in historic buildingsMechanical properties of masonry from the historic Beylerbeyi Palace are analyzed in the paper. The indirect procedure was used as the owner did not allow usual testing. The mineralogical structure of the original mortar was initially determined. This was followed by preparation and laboratory testing of mortar and masonry samples. Mechanical properties obtained were corrected through dynamic identification so as to determine the real modulus of elasticity of the masonry. To this aim, an ambient vibration survey was performed, and the finite-element model of the palace was constructed and tuned. Finally, the strength parameters of the masonry were corrected.

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Time-Dependent Deformations of Lime-Based Mortars and Masonry Specimens Prepared with Them

Papayianni,

Berberidou

2023

RILEM Bookseries

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Material properties of historical masonry of the Frauenkirche and the masonry guideline for reconstruction

Cited by 15 publications

References 1 publication

ISHIGAKI Retrieval System Using 3D Shape Matching and Combinatorial Optimization

ISHIGAKI Retrieval System Using 3D Shape Matching and Combinatorial Optimization

Istraživanje mehaničkih svojstava ziđa povijesnih zidanih građevina

Time-Dependent Deformations of Lime-Based Mortars and Masonry Specimens Prepared with Them

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