Abstract
In recent years, the earthen ruins’ cultural relics have aroused people’s extensive attention, and the protection of them is more and more urgent. The aim of the paper is to present the essential results of an ongoing research on a reinforced rammed earthen wall in the Suoyang ancient city (Guazhou, China). A variety of methods to combining aerial survey, dynamic test, and numerical model is provided with the purpose of estimating the structural characteristics of the ancient rammed wall. An aerial geometric survey based on high-resolution images made by unmanned aerial vehicle (UAV) has been approached to acquiring a 3D model. An ambient vibration test has been adopted by using vibration pick-ups. The experimental data were dealt with the operational modal analysis (OMA) followed by comparing with the numerical results delivered by the model. Meanwhile, the results showed the maximum displacements and corresponding positions of the structure under the three modes by the finite element model (FEM).
Highlights
Shock and Vibration e experimental work depicted in the paper followed an elementary investigation on a reinforcement rammed wall located in the Suoyang ancient city (Guazhou, China), under which actual conditions indicated that it has been strengthened and in order to avoid the loss of an ancient cultural architecture (Figure 1)
Results and Discussion e experimental results in term of natural frequencies and related modes have summarized in the previous section. e numerical modelling of masonry structure has been investigated by many researchers [25, 26]
The simplified numerical model was determined by the aerial survey carried out by direct method. e parameters with the material properties were gained from reference [28]
Summary
With the development of UAV technology, it is widely used in field investigations, especially in dangerous or inaccessible places [20]. Based on the high-resolution images provided by UAV technology, the size of the wall and the structural characteristics of the site provide the optimal case study for conducting architectural and geometric measurements. Plotting the range of the flight on the remote controller, the target level of accuracy depended on the flight altitude, and as such, we must adjust the flight height. E flight was carried out using a Phantom 4 manufactured by DJI, which flew at an altitude of 80 m. Reducing the height can improve the accuracy, but it would greatly increase the cost of image processing. Us, we need to take the height into account for processing costs. E flight range is the continuous walls in the east of Suoyang ancient city, and the object to be studied in the paper is a part. Data Processing and Analysis e dynamic characterization with reference to natural frequencies and corresponding modes has carried out the OMA using vibration response action under conditions by virtue of classical measurements
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