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The anchor rebar column-foundation connection (SAC) has been proposed for the concrete filled steel tube (CFST) column. To enhance the load transfer between the steel tube and concrete, shear hoop rings or perfobond strips (PBLs) could be used, forming the SAC-H and SAC-P, respectively. Anchor rebars could be directly welded onto the surface of steel tube (SAC-W) to transfer the axial load. To date, experimental studies have been conducted to investigate the seismic performance of the four novel types of column-foundation connections. To facilitate the application of the proposed connections, design methods are explored and proposed in this paper. A test database is assembled first, followed by the development of the finite element model (FEM). On the basis of a parametric study, design methods for the sectional strength and elastic stiffness are proposed.

Capturing the three-dimensional (3D) shape of the burden surface of a blast furnace (BF) in real-time with high accuracy is crucial for improving gas flow distribution, optimizing coke operation, and stabilizing BF operation. However, it is difficult to perform 3D shape measurement of the burden surface in real-time during the ironmaking process because of the high-temperature, high-dust, and lightless enclosed environment inside the BF. To solve this problem, a real-time 3D measurement system is developed in this study by combining an industrial endoscope with a virtual multi-head camera array 3D reconstruction method. First, images of the original burden surface are captured using a purpose-built industrial endoscope. Second, a novel micro-pixel luminance polarization method is proposed and applied to compensate for the heavy noise in the backlit images due to high dust levels and poor light in the enclosed environment. Third, to extract depth information, a multifeature-based depth key frame classifier is designed to filter out images with high levels of clarity and displacement. Finally, a 3D shape burden surface reconstruction method based on a virtual multi-head camera array is proposed for capturing the real-time 3D shape of the burden surface in an operational BF. The results of an industrial experiment illustrate that the proposed method can measure the 3D shape of the entire burden surface and provide reliable burden surface shape information for BF control.

Low-carbon development is a new method of human ecologic civilization and is an important countermeasure to cope with global climate change. With the rapid development of information technology, how to support low-carbon development by information technology is a meaningful subject to study. This paper put forth the conception of internet of energy-saving and emission-reduction (IE&E) and its framework, key technologies. IE&E is new application in the area of energy-saving and emission-reduction based on internet and internet of things. IE&E is a new internet system which has special function and structure compared with internet and internet of things, as it integrates information flow, material flow, energy flow and notion flow. Its purpose is for energy-saving and emission-reduction by information technology, and it will be used for the government decision-making and enterprise' energy-saving and emission-reduction. The framework of IE&E includes perception layer technology, network layer technology, application layer technology and common technology. The key technologies of IE&E are the dynamic monitoring technology and spatial information technology. At the end of this article, countermeasures to promote the development of regional low-carbon with IE&E are set forth.