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Liu Y.,Changan University | Zheng H.,China Northwest Building Design Research Institute Co Ltd
Advanced Materials Research | Year: 2013

Steel frame filled with steel-concrete composite deep beam was suggested to meet middle rigidity demand between steel frame and steel frame-shear wall structure. Two quasi-static tests on steel frame filled with composite deep beam and one test on moment steel frame were conducted to demonstrate the effectiveness. The composite deep beam can supply suitable stiffness to the moment frame to form desired lateral resisting system and realize gradually changing of the stiffness from steel frame to steel frame-shear wall structure. The interactive analysis was adopted to calculate the distribution parameter of the shear force and moment between the composite deep beam and steel frame as reference for the design of the structure. The results give an effective method to assure lateral stiffness of the structure as well as provide suitable earthquake-resistant capability and dissipate seismic energy capacity by choosing the span-to-depth ratio of the composite deep beams. The outside reinforced concrete plate can restrain the buckling of the steel plate and make full use of the steel. © (2013) Trans Tech Publications, Switzerland. Source


Jiang L.,Nanjing Southeast University | Jiang L.,Changan University | Zheng H.,Changan University | Liu Y.,China Northwest Building Design Research Institute Co Ltd | Yuan X.,Changan University
International Journal of Steel Structures | Year: 2014

Steel frame and shear wall infill steel frame are two commonly lateral load resisting systems used in building structures. To realize the modulation of initial stiffness of steel structures, make it easily assembled and removed and prevent plastic hinges developing in the frame columns and collapse of all structure, a new anti-seismic infill wall system, composite steel plate deep beam (CDB), is introduced. The system uses steel plate deep beam with a precast reinforced concrete panel attached one side. This paper describes the experimental work related to the tests of CDB under cyclic loads. The experimental results of one pure steel frame (PF) and two composite steel plate deep beam infill steel frame (CDBF) with different span-height ratio are summarized and discussed, the hysteretic loops were obtained. Based on the test results, effects of the CDB on the load capacity, ductility, hysteretic property and energy-dissipation of the pure steel frame were analyzed. The results show that the CDB enhances the initial stiffness and load capacity by a large margin, and the hysteretic loops are replete and the skeleton curves have apparent stage of plastic flow, the ductility and energy dissipation capacity of the test specimens are enhanced. Lastly, regression analysis based on the tests data, and restoring force model can apply to elastoplastic response analysis of the CDBF systems. Therefore, the deep beam can be used as the first defense line of earthquake-resistance, and the steel frame can be used as the second. © 2014, Korean Society of Steel Construction and Springer-Verlag Berlin Heidelberg. Source


Li A.G.,Xian University of Architecture and Technology | Yin H.G.,Xian University of Architecture and Technology | Wang G.D.,China Northwest Building Design Research Institute Co Ltd
7th International Symposium on Heating, Ventilating and Air Conditioning - Proceedings of ISHVAC 2011 | Year: 2011

Particle image velocimetry (PIV) is used to visualize and investigate the airflow characteristic of air curtain in an enclosure. The whole airflow patterns and flow field are measured and analyzed in detail, under different air supply velocities, Archimedes number and the slot location. The results show that the supply air velocity has a remarkable effect on air distribution in the occupant zone. Primary vortex phenomena near the vertical wall region are also observed when the distance from the slot to the sidewall increases, and it will obviously affect the airflow characteristic in the occupant zone. The current experimental study and its results are helpful in understanding a new air distribution-air curtain used for room ventilation. Source


Shi H.,China Northwest Building Design Research Institute Co Ltd
World Information on Earthquake Engineering | Year: 2015

This paper introduces the method for design of 25.7 m span post-tensioned bond prestressed frame beam in performing art center of Xi'an Music college. Using mixed type of prestressed and nomprestressed reinforcements in Intensity 8 seismic fortificated large-span structure can satifsfy firely the demand for architectural space and use function. In current code, there are not special clauses and construction measures on prestressed concrete structure design and only there are some general demand for seismic design for prestressed concrete structure. It is important to use partial prestressed concrete structure in seismic zone to ensure ductility of component section. At the sametime, we should play attention to control the degree of prestress and the height of relative compressed zone of cross section. ©, 2015, Science and Technology Periodical Press. All right reserved. Source


Li A.G.,Xian University of Architecture and Technology | Yin H.G.,Xian University of Architecture and Technology | Wang G.D.,China Northwest Building Design Research Institute Co Ltd
International Journal of Ventilation | Year: 2012

This paper focuses on the performance of a new air curtain ventilation system. Particle Image Velocimetry (PIV) is used to visualize and investigate the airflow characteristic of an air curtain in an enclosure and the airflow pattern and temperature fields are measured and analyzed in detail. The air supply velocity and the slot inlet location were varied during the experimental process. The current results show that with the increase of air supply velocity the cooling effect in the occupied zone is further strengthened. When the air supply velocity ranges from 0.3 to1.5 m/s, the minimum mean temperature difference in the occupied zone is nearly 0.4 °C. Additionally, it was found that, for the air curtain ventilation model, the effective distance from the slot location to the sidewall is 0 to140 mm. When the distance is greater than about 150 mm, the air curtain ventilation will turn into mixing ventilation. The current experimental study and its results are helpful in understanding a new air distribution method i.e. an air curtain used for room ventilation. Source

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