{"title":"The Estimation Method of Stress Distribution for Beam Structures Using the Terrestrial Laser Scanning","authors":"Sang Wook Park, Jun Su Park, Byung Kwan Oh, Yousok Kim, Hyo Seon Park","country":null,"institution":"","volume":103,"journal":"International Journal of Architectural and Environmental Engineering","pagesStart":847,"pagesEnd":851,"ISSN":"1307-6892","URL":"https:\/\/publications.waset.org\/pdf\/10001976","abstract":"This study suggests the estimation method of stress\r\ndistribution for the beam structures based on TLS (Terrestrial Laser\r\nScanning). The main components of method are the creation of the\r\nlattices of raw data from TLS to satisfy the suitable condition and\r\napplication of CSSI (Cubic Smoothing Spline Interpolation) for\r\nestimating stress distribution. Estimation of stress distribution for the\r\nstructural member or the whole structure is one of the important\r\nfactors for safety evaluation of the structure. Existing sensors which\r\ninclude ESG (Electric strain gauge) and LVDT (Linear Variable\r\nDifferential Transformer) can be categorized as contact type sensor\r\nwhich should be installed on the structural members and also there are\r\nvarious limitations such as the need of separate space where the\r\nnetwork cables are installed and the difficulty of access for sensor\r\ninstallation in real buildings. To overcome these problems inherent in\r\nthe contact type sensors, TLS system of LiDAR (light detection and\r\nranging), which can measure the displacement of a target in a long\r\nrange without the influence of surrounding environment and also get\r\nthe whole shape of the structure, has been applied to the field of\r\nstructural health monitoring. The important characteristic of TLS\r\nmeasuring is a formation of point clouds which has many points\r\nincluding the local coordinate. Point clouds are not linear distribution\r\nbut dispersed shape. Thus, to analyze point clouds, the interpolation is\r\nneeded vitally. Through formation of averaged lattices and CSSI for\r\nthe raw data, the method which can estimate the displacement of\r\nsimple beam was developed. Also, the developed method can be\r\nextended to calculate the strain and finally applicable to estimate a\r\nstress distribution of a structural member. To verify the validity of the\r\nmethod, the loading test on a simple beam was conducted and TLS\r\nmeasured it. Through a comparison of the estimated stress and\r\nreference stress, the validity of the method is confirmed.","references":null,"publisher":"World Academy of Science, Engineering and Technology","index":"Open Science Index 103, 2015"}