TLS-FEM INTEGRATED STRUCTURAL DEFORMATION ANALYSIS ON THE BEAMLESS HALL AT NANJING, CHINA

Abstract. A method integrating terrestrial laser scanning (TLS) and finite element modelling (FEM) is proposed in this study. It aims at assessing the structural deformation of a historic brick-masonry building, the Beamless Hall at Linggu Temple in Nanjing, China. The building was composed of a series of vaults and arches, the largest among whom spans over 11m. TLS (Z+F Imager5010X) was used to collect 3D point cloud with high density. Point slices and geometric feature computation (verticality) were employed to detect geometric displacement quantitatively and intuitively. FEM-simulation was based on an ideal 3D model ignoring geometric anomalies. Results show that the Beamless Hall has inherent structural defect owing to its asymmetric layout along the transverse axis. Computing geometric feature of point cloud is fast and intuitive to detect and show geometric deviation. Inferred by FEM-simulated results and TLS-based deviation analysis, the building’s asymmetrical layout under self-weight is probably the main reason causing its structural deformation. Further developments include FEM based on as-built geometry, corrected materials parameters, and a comprehensive geometric deviation analysis.

Download Full-text

Network method for deformation analysis of three-dimensional point cloud with terrestrial laser scanning sensor

International Journal of Distributed Sensor Networks ◽

10.1177/1550147718814139 ◽

2018 ◽

Vol 14 (11) ◽

pp. 155014771881413 ◽

Cited By ~ 8

Author(s):

Xiangyang Xu ◽

Hao Yang

Keyword(s):

Point Cloud ◽

Laser Scanning ◽

Three Dimensional ◽

Terrestrial Laser Scanning ◽

Deformation Analysis ◽

Transverse Displacement ◽

Displacement Analysis ◽

Accuracy Measurement ◽

Network Method ◽

Displacement Information

The complexity of structural materials is increasing the importance of the technology for high accuracy measurement. How to obtain the displacement information of structural feature points accurately and efficiently is the key issue of deformation analysis. In this article, displacement analysis of a composite arched structure is investigated based on the terrestrial laser scanning technique. A new method based on the measured point cloud is proposed to analyze the displacement of surficial points, resulting in not only the displacement size but also the displacement direction. The innovation lies in extracting the displacement information with a network and remapped point cloud, which is called the network method. The displacement map obtained demonstrates that the transverse displacement in the experiment plays an important role in the safety of the structure, which could not be observed and obtained by the surface approximation method. Therefore, the panorama- and pointwise displacement analysis technologies contribute to ensure the safety of increasingly complex constructions.

Download Full-text

The Application and Research of Terrestrial 3D Laser Scanning Technology in Tunnel Survey

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.709.465 ◽

2014 ◽

Vol 709 ◽

pp. 465-468

Author(s):

Xian Quan Han ◽

Fei Qin ◽

Zhen Zhang ◽

Shang Yi Yang

Keyword(s):

Point Cloud ◽

Laser Scanning ◽

3D Model ◽

Analysis Procedure ◽

Surface Model ◽

Point Cloud Data ◽

3D Laser Scanning ◽

Cloud Data ◽

Experimental Application ◽

Tunnel Section

This paper examines the basic flow and processing of the terrestrial 3D Laser scanning technology in the tunnel survey. The use of the method is discussed, point cloud data which have been registered, cropped can be constructed to a complete tunnel surface model. An example is given to extract the tunnel section and calculate the excavation of the tunnel. Result of the experimental application of this analysis procedure is given to illustrate the proposed technique can be flexibly used according to the need based on its 3D model. The feasibility and advantages of terrestrial 3D laser scanning technology in tunnel survey is also considered.

Download Full-text

A FAST METHOD FOR MEASURING THE SIMILARITY BETWEEN 3D MODEL AND 3D POINT CLOUD

ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ◽

10.5194/isprs-archives-xli-b1-725-2016 ◽

2016 ◽

Vol XLI-B1 ◽

pp. 725-728

Author(s):

Zongliang Zhang ◽

Jonathan Li ◽

Xin Li ◽

Yangbin Lin ◽

Shanxin Zhang ◽

...

Keyword(s):

Surface Area ◽

Point Cloud ◽

Laser Scanning ◽

3D Model ◽

Average Distance ◽

Synthetic Data ◽

Fast Method ◽

3D Point Cloud ◽

Partial Similarity ◽

Distance Weighted

This paper proposes a fast method for measuring the partial Similarity between 3D Model and 3D point Cloud (SimMC). It is crucial to measure SimMC for many point cloud-related applications such as 3D object retrieval and inverse procedural modelling. In our proposed method, the surface area of model and the Distance from Model to point Cloud (DistMC) are exploited as measurements to calculate SimMC. Here, DistMC is defined as the weighted distance of the distances between points sampled from model and point cloud. Similarly, Distance from point Cloud to Model (DistCM) is defined as the average distance of the distances between points in point cloud and model. In order to reduce huge computational burdens brought by calculation of DistCM in some traditional methods, we define SimMC as the ratio of weighted surface area of model to DistMC. Compared to those traditional SimMC measuring methods that are only able to measure global similarity, our method is capable of measuring partial similarity by employing distance-weighted strategy. Moreover, our method is able to be faster than other partial similarity assessment methods. We demonstrate the superiority of our method both on synthetic data and laser scanning data.

Download Full-text

3D COMPARISON TOWARDS A COMPREHENSIVE ANALYSIS OF A BUILDING IN CULTURAL HERITAGE

ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ◽

10.5194/isprs-archives-xlii-2-1061-2018 ◽

2018 ◽

Vol XLII-2 ◽

pp. 1061-1066 ◽

Cited By ~ 1

Author(s):

I. Selvaggi ◽

M. Dellapasqua ◽

F. Franci ◽

A. Spangher ◽

D. Visintini ◽

...

Keyword(s):

Cultural Heritage ◽

Point Cloud ◽

Laser Scanning ◽

Three Dimensional ◽

Deformation Analysis ◽

Point Cloud Data ◽

Cloud Data ◽

Site Restoration ◽

Close Range ◽

Remote Sensing Techniques

Terrestrial remote sensing techniques, including both Terrestrial Laser Scanning (TLS) and Close-Range Photogrammetry (CRP), have been recently used in multiple applications and projects with particular reference to the documentation/inspection of a wide variety of Cultural Heritage structures. The high density of TLS point cloud data allows to perform structure survey in an unprecedented level of detail, providing a direct solution for the digital three-dimensional modelling, the site restoration and the analysis of the structural conditions. Textural information provided by CRP can be used for the photorealistic representation of the surveyed structure. With respect to many studies, the combination of TLS and CRP techniques produces the best results for Cultural Heritage documentation purposes. Moreover, TLS and CRP point cloud data have been proved to be useful in the field of deformation analysis and structural health monitoring. They can be the input data for the Finite Element Method (FEM), providing some prior knowledge concerning the material and the boundary conditions such as constraints and loading. The paper investigates the capabilities and advantages of TLS and CRP data integration for the three-dimensional modelling compared to a simplified geometric reconstruction. This work presents some results concerning the Baptistery of Aquileia in Italy, characterized by an octagonal plan and walls composed by masonry stones with good texture.

Download Full-text

ANALYSIS OF POSSIBILITIES OF LOW-COST PHOTOGRAMMETRY FOR INTERIOR MAPPING

ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ◽

10.5194/isprs-archives-xlii-5-w3-27-2019 ◽

2019 ◽

Vol XLII-5/W3 ◽

pp. 27-31

Author(s):

A. Dlesk ◽

K. Vach ◽

P. Holubec

Keyword(s):

Point Cloud ◽

Laser Scanning ◽

3D Model ◽

Low Cost ◽

Digital Camera ◽

3D Modelling ◽

Light Conditions ◽

Advantages And Disadvantages ◽

Lower Light ◽

High Level

Abstract. This paper shows the possibilities of using low-cost photogrammetry for interior mapping as a tool to gather fast and accurate data for 3D modelling and BIM. To create a 3D model of a building interior with a high level of detail requires techniques such as laser scanning and photogrammetry. In the case of photogrammetry, it is possible to use standard cameras and SfM software to create an accurate point cloud which can be used for 3D modelling and then for BIM. The images captured indoor are often captured under lower light conditions. Using different exposure during capturing of images of building interior was tested. Frequent plain walls of a building interior cause that the images are usually lack of any features and their photogrammetric processing is getting much more difficult. In some cases, results of photogrammetric processing are poor and inaccurate. In this paper, an experiment of creating a 3D model of a building interior using photogrammetric processing of images was carried out. For this experiment digital camera with two different lenses (16 mm lens and fisheye lens) was used. For photogrammetric processing were chosen different software. All the results were compared to each other and to the laser scanning data of the interior. At the end of the paper, the discussion of the advantages and disadvantages of the shown method has been made.

Download Full-text

Design and Rapid Prototyping of S-Shape Push-Ups Frame Based on Laser Scanning

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.752-753.1401 ◽

2015 ◽

Vol 752-753 ◽

pp. 1401-1405 ◽

Cited By ~ 1

Author(s):

Hong Jun Ni ◽

Qing Qing Chen ◽

Yi Pei ◽

Yi Lv ◽

Xing Xing Wang

Keyword(s):

Rapid Prototyping ◽

Point Cloud ◽

Laser Scanning ◽

3D Model ◽

Laser Scanner ◽

Point Cloud Data ◽

Model Design ◽

Cloud Data ◽

Frame Model ◽

Business Efficiency

Model design and rapid prototyping are utilized to manufacture push-ups frame. Point cloud data can be obtained by scanning parts with hand-held laser scanner, and imported into the Imageware to process. The varied points are removed, the missing points are repaired, and then the 3D model is designed through the Pro/E. Finally, the frame model is completed by rapid prototyping printers. The manufacturing period is shorten through the way of putting two technologies in the field of manufacturing together, the production requirements are met, and the business efficiency is improved.

Download Full-text

LONG LINE CLIFF TOPOGRAPHY MEASUREMENT BY USING STRUCTURE FROM MOTION ALGORITHM IN PHOTOGRAMMETRY

ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ◽

10.5194/isprs-archives-xlii-2-w13-5-2019 ◽

2019 ◽

Vol XLII-2/W13 ◽

pp. 5-12

Author(s):

C. Altuntas

Keyword(s):

Structure From Motion ◽

Point Cloud ◽

Laser Scanning ◽

3D Model ◽

Measurement Techniques ◽

High Accuracy ◽

Aerial Laser Scanning ◽

The Earth ◽

Long Line ◽

Dense Point

Abstract. The topography of cliffs and steep slopes must be measured to acquire additional information for landscaping, visualizing changes and taking precautions against natural hazards. The Earth topography has been measured predominantly with photogrammetry, terrestrial/aerial laser scanning or other traditional measurement techniques. The stereo photogrammetry necessitates greater effort to obtain a three-dimensional (3D) model of the imaged surface. Meanwhile, terrestrial or aerial laser scanning can collect high-density measurements of spatial data in a short time. However, the costs of implementing laser scanning instruments are very high. Furthermore, conventional measurement techniques that use total stations require immense effort to collect complete 3D measurements of cliffs. On the other hand, dense image based point cloud using multi-view photogrammetry based on structure from motion (SfM) algorithm is much more effective than the others for measuring the Earth topography. In this study, the cliff topography of an old quarry located in the state of Selcuklu of Konya Province in Turkey was measured by multi-view photogrammetry. The cliff has a continuous length of approximately 600 metres and a height of 25 metres in some places. The 3D model of the cliff was generated with the image based dense point cloud of multi-view photogrammetry. Then 3D dense point cloud model was registered into a local georeference system by using control points (CPs). Because of the long line measurement area, number and localization of the CPs is very important for achieving a high-accuracy to registration into georeferenced system. The registration accuracies were evaluated for different number and distribution of the CPs with the residuals on the check points (ChPs). The high accuracy registration was acquired with uniform distributed 3 and 8 CPs as the residuals of 24.08&thinsp;cm and 23.03&thinsp;cm on the ChPs respectively. The results indicated that 3D measurement of long line cliffs can be performed using multi-view photogrammetry, and the registration should be made with the uniform distributed CPs. In addition, a texture-mapped 3D model and orthophoto images of the cliff surfaces were created for detailed visualization.

Download Full-text

POINT CLOUD DERIVED FROMVIDEO FRAMES: ACCURACY ASSESSMENT IN RELATION TO TERRESTRIAL LASER SCANNINGAND DIGITAL CAMERA DATA

ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ◽

10.5194/isprs-archives-xlii-2-w3-217-2017 ◽

2017 ◽

Vol XLII-2/W3 ◽

pp. 217-223 ◽

Cited By ~ 2

Author(s):

P. Delis ◽

M. Zacharek ◽

D. Wierzbicki ◽

A. Grochala

Keyword(s):

Data Storage ◽

Point Cloud ◽

Laser Scanning ◽

3D Model ◽

Accuracy Assessment ◽

Point Clouds ◽

Histogram Equalization ◽

Video Data ◽

Video Frame ◽

Video Frames

The use of image sequences in the form of video frames recorded on data storage is very useful in especially when working with large and complex structures. Two cameras were used in this study: Sony NEX-5N (for the test object) and Sony NEX-VG10 E (for the historic building). In both cases, a Sony α f&thinsp;=&thinsp;16&thinsp;mm fixed focus wide-angle lens was used. Single frames with sufficient overlap were selected from the video sequence using an equation for automatic frame selection. In order to improve the quality of the generated point clouds, each video frame underwent histogram equalization and image sharpening. Point clouds were generated from the video frames using the SGM-like image matching algorithm. The accuracy assessment was based on two reference point clouds: the first from terrestrial laser scanning and the second generated based on images acquired using a high resolution camera, the NIKON D800. The performed research has shown, that highest accuracies are obtained for point clouds generated from video frames, for which a high pass filtration and histogram equalization had been performed. Studies have shown that to obtain a point cloud density comparable to TLS, an overlap between subsequent video frames must be 85&thinsp;% or more. Based on the point cloud generated from video data, a parametric 3D model can be generated. This type of the 3D model can be used in HBIM construction.

Download Full-text

GENERATION AND COMPARISON OF TLS AND SFM BASED 3D MODELS OF SOLID SHAPES IN HYDROMECHANIC RESEARCH

ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences ◽

10.5194/isprs-archives-xli-b5-925-2016 ◽

2016 ◽

Vol XLI-B5 ◽

pp. 925-929

Author(s):

R. Zhang ◽

D. Schneider ◽

B. Strauß

Keyword(s):

Point Cloud ◽

Laser Scanning ◽

3D Model ◽

Accuracy Assessment ◽

3D Models ◽

3D Point Cloud ◽

Synthetic Material ◽

Qualitative Comparison ◽

Software Packages ◽

Main Influence

The aim of a current study at the Institute of Hydraulic Engineering and Technical Hydromechanics at TU Dresden is to develop a new injection method for quick and economic sealing of dikes or dike bodies, based on a new synthetic material. To validate the technique, an artificial part of a sand dike was built in an experimental hall. The synthetic material was injected, which afterwards spreads in the inside of the dike. After the material was fully solidified, the surrounding sand was removed with an excavator. In this paper, two methods, which applied terrestrial laser scanning (TLS) and structure from motion (SfM) respectively, for the acquisition of a 3D point cloud of the remaining shapes are described and compared. Combining with advanced software packages, a triangulated 3D model was generated and subsequently the volume of vertical sections of the shape were calculated. As the calculation of the volume revealed differences between the TLS and the SfM 3D model, a thorough qualitative comparison of the two models will be presented as well as a detailed accuracy assessment. The main influence of the accuracy is caused by generalisation in case of gaps due to occlusions in the 3D point cloud. Therefore, improvements for the data acquisition with TLS and SfM for such kind of objects are suggested in the paper.

Download Full-text