When detecting the large objects by infrared thermal method, it is difficult to get a whole panoramic picture. So it needs to stitch some infrared thermography. Image mosaic includes 4 steps, feature detection, feature registration, image transformation and image fusion. This paper studies about an infrared thermograph mosaic algorithm based on the feature point detection and registration, and realizes it in MATLAB.
"six two building" in ocean university of china has been used over 90 years, which can not meet the requirements for earthquake resistance protection. In order to ensure its safe use, at the same time keeping the original building style, this paper proposes the seismic appraisal method after field detection, structure calculation and appraisal regulation check. Then this paper presents corresponding strengthening suggestion. It can be used for reference in other similar old building.
Based on the existing research results, this paper has primarily researched on numerical simulation analysis of a wall-beam joint in complex stress situation in a shear wall structure, in terms of structural deformation, crack of concrete, stress-strain condition of reinforced concrete, bond-slip state of concrete of the joint. The mature finite element analysis software ANSYS is selected as a platform and the parametric design language APDL is used as the foundation. Analyze the deformation of the joint; the cracks and the development status; the strain and stress of the joint and the bond-slip condition between steel bars and concrete. Some problems existing in the results at such joint calculated by commonly-used structure design software PKPM were found to need extra attention and then the paper put forward some feasible solutions.
This paper has primarily studied stress-lag effect for reinforced components by using the finite element method. The mature finite element analysis software ANSYS is selected as the calculation tool and the research object is a brick wall of reinforcing concrete splint. The concrete splints bear most horizontal seismic shear force for the stiffness of the new surface course is high. When seismic action occurs, the concrete splints may be broken before the brick walls. After compared the results of ANSYS and PKPM, the actual bearing capacity value of the concrete splints is smaller than the calculation results of the reinforcement design method by current codes for ignoring the influence of stress-lag effect.
In recent years, Infrared thermal imaging technology has been widely used in the detection of construction quality relied on its distinguishing features of non-destruction, non-contact and low cost. But, there are many problems in practice, such as it is difficult to quantify the detection results and determine the best testing time. Aimed to several issues of the infrared-thermography method on detecting the defects of external wall, this paper discusses the determination of the optimum time and puts forward a method which can decide the defects quantitatively; it is the method of temperature rise rate.
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