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Liu L.,Chongqing University | Li Y.,Chongqing University | Luo J.,Sichuan Provincial Architectural Design Institute | Xiang L.,Chongqing University
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2013

The structure on the slope with uneven height grounding column ends is one of the most familiar structure types. Slope deformation results in different foundation deformation where it grounds in uneven height. The difference of foundation deformation leads to the existence internal force in structure. Simplified analysis model of building structure on the slope with uneven height grounding column ends is built up in this paper. Internal force of simplified model in the case of slope deformation is analyzed, as well as the change rule of internal force when beam span and column height vary. Structure example is designed and internal force distribution characteristic of the example is analyzed. The research shows that even if small slope deformation occurs, it will result in large internal force in building structure on the slope. Structure internal force caused by slope deformation mainly locates in the second floor above uneven height grounding and the floors below that. And the internal force of beams and columns in the first floor above uneven height grounding is the largest. The influence of slope deformation on structure can be improved via the design method and construction measures. Conclusions can be used to guide the design of building structure on the slope in the case of slope deformation, and to provide foundation for subsequent research.

Zhang X.-C.,Nanjing Southeast University | Xu Z.-D.,Nanjing Southeast University | Ran C.-S.,Sichuan Provincial Architectural Design Institute | Zhu J.-T.,Nanjing Southeast University
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2013

Magneto-rheological damper (MRD) is an excellent semi-active control device. The location matrix of MRD in the frame structure incorporated with MRD was derived. Then a member model was selected as the mathematical model of the structure. An elastic-plastic dynamic response analysis of the structure incorporated with MRD was programmed by using MATLAB. The displacement and acceleration responses of the structure with and without MRD, as well as the distribution of plastic hinges of the member, were calculated and compared. Comparison results show that the displacement and the acceleration responses of each floor of the structure with MRD were reduced significantly, in which the vibration mitigation effect on displacement is superior to that on acceleration. At the same time, the number of plastic hinges is also reduced.

Wang Y.,Harbin Institute of Technology | Wang Y.,China University of Mining and Technology | Dong Y.,Huaqiao University | Peng P.,Shanghai Tianhua Architectural Design Co. | Li S.,Sichuan Provincial Architectural Design Institute
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2013

A furnace was designed to study the fire behavior of the floor in a full-scale steel-framed structure. This paper presents the design of the furnace, the measurement method of temperature and deflection. The experimental phenomena as well as the failure characteristic of floor, steel beams and the connections were briefly discussed. The temperature distribution of the structural elements was analyzed in detail, together with their displacements. The test results were also compared with other testing results. The results indicate that the furnace temperature is basically even, the average furnace temperature at the shut-off time is about 780°C. For the concrete slab, there is larger temperature gradient during the heating stage and temperature lag phenomenon for the cooling phase. For the steel beam, there is large temperature gradient between the top and bottom flanges at the early stage, and the temperature is consistent later. It is observed that the top crack pattern of the heated panel is dependent on its boundary condition, and that of the unheated panel is dependent on the number and position of the heated panels. Due to the arc action of the heated composite beams, the mid-span deflection of each heated panel has a plateau. Owing to the constraint provided by other structural elements, the steel beam has better fire-resistant performance. Unlike the high-strength joint, the mixed joint prevents the steel beam from local buckling.

Wu Z.-L.,Tongji University | Xu P.-J.,Sichuan Provincial Architectural Design Institute | Chen H.-B.,Tongji University
Zhongguo Huanjing Kexue/China Environmental Science | Year: 2014

The bench-scale study on wastewater of water work which purifies Qingcaosha raw water was fulfilled using the combined process of coagulation and micro-filtration (MF), and the removal effect of traditional pollutants, trace organics and metal ions as well as the generation trend of the disinfecting by-products were analyzed. It was showed by the results that, coagulation pretreatment could mitigate flat-sheet membrane fouling effectively; the combined process was effective to remove particles?strains?Escherichia coli and other suspended substances with over 85% removing rate, but it could not do well with the dissolved components, especially aluminum and trace organics, with the degradation of under 20%. At the same concentration of the chlorine disinfectant, the generation trend of the disinfection by-products after membrane filtration was higher than the effluent of the sand filter or carbon filter. It was suggested that the optimal reuse points of the treated wastewater could be placed in front of the sand filter or the biological activated carbon filtration.

Yang Z.,Harbin Institute of Technology | Dong Y.,Huaqiao University | Lv J.,Harbin Institute of Technology | Lv J.,Shandong Jianzhu University | And 2 more authors.
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2012

The self designed furnace was used to study the fire performance of two-way concrete slab in a full-scale three-story steel-framed building. This paper introduces the design of the test building and furnace, test plan, measuring contents and method. The test observations, cracking and failure characteristics of the slab were described. The distribution of temperature along the depth of the slab, temperature variation of the steel reinforcement, vertical deflection and horizontal displacement were studied. It is shown that the distribution of temperature along the slab depth is nonlinear, and the temperature gradients are large. The restraint provided by the adjacent structural members has significant effect on the structural fire behavior of the heated two-way concrete slab in a whole structure. Main cracks occur on the top surface of the heated slab, and are located at approximately the 1/4 span near the interior edges of the slab(the position where the top reinforcing bars are cut off). Because of the structural continuity and interaction between structural members, regular cracks also occur on the top of the adjacent unheated slabs. The largest vertical deflection of the slab occurs at the position a short distance away from the center of the slab to the interior edges due to the redistribution of moment induced by the formation and development of the main cracks. The test results indicate that the two-way concrete slab in a whole structure has good fire performance.

Yang L.-L.,Chongqing University | Lu J.,Chongqing University | Tang H.-Q.,Chongqing University | Gan L.-L.,Sichuan Provincial Architectural Design Institute
Chongqing Daxue Xuebao/Journal of Chongqing University | Year: 2011

As the equipment for condensing heat transfer, heat transfer capacity of cooling tower has a direct effect on its outlet water temperature which can influence the EER of chiller. The outlet water temperature of the cooling tower can be lowered through taking measures according to the study on its influencing factors and the EER of the system can be improved. Taking a crossflow cooling tower in an engineering practice as a subject, a mathematical model is built based on the measured data and the analysis on factors of outlet water temperature is conducted both theoretically and experimentally.

Lu J.,Chongqing University | Wang L.,Chongqing University | Wang X.,Sichuan Provincial Architectural Design Institute | Li C.-D.,Chongqing University
Advanced Materials Research | Year: 2012

A systematic and detailed introduction of IFIX-based SCADA system in public buildings is given in this paper. SCADA system consisting of on-site computer control system, central operation station and intelligent metering system, makes the energy-management system complete. It reflects the energy consumption status reasonably by energy monitoring, combined metering as well as apportion in terms of acquirement. By means of equipments' energy consumption analysis, the running mode of equipments is adjusted to reduce energy consumption in buildings. The advanced function of SCADA system, moving forward, should be self-adaptive energy management with the advent of intelligent building. © (2012) Trans Tech Publications, Switzerland.

Li Z.,Sichuan Provincial Architectural Design Institute | Wang X.,Sichuan Provincial Architectural Design Institute | Zhang Y.,Sichuan Provincial Architectural Design Institute
Proceedings of the 12th International Symposium on Structural Engineering, ISSE 2012 | Year: 2012

Computational fluid dynamics software is used to simulate the mean wind-induced pressure and wind environment in Super-star Hotel at Sanya Phoenix Island. The distribution regularity and behavior of mean wind pressure were analyzed using different inflow wind directions. The representative simulated wind pressure was then compared with wind tunnel test data. Results show that the numerical simulation agrees well with the wind tunnel test, verifying the accuracy of the former. The wind interference effects on the building are also discussed in detail.

Wu C.S.,Chongqing Vocational Institute of Engineering | Liu F.,Sichuan Provincial Architectural Design Institute | Wu H.,Wuhan University
Electronic Journal of Geotechnical Engineering | Year: 2014

In order to reveal the internal force and deformation of supporting structures, the depth of foundation excavating are considered. F-SPW7.0 is adopted to simulate the retaining structures' mechanical behavior and deformation in excavating process. The results show that in the beginning of excavation, the retaining structures do not play an important role. but the internal force and displacement of pile become larger and larger with the deep foundation excavation going on. The largest deformation of retaining pile places the top, largest moment and shear stress is falling down. At the meantime, the ground declining diagram from this software can describe the changing law of internal force, it is very valuable. © 2014, EJGE.

Yuan X.,Zhejiang University | Zhou L.,Zhejiang University | Zhou L.,Sichuan Provincial Architectural Design Institute | Li A.,Zhejiang University
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2013

The structural buckling was actually a mechanism motion process. In the analysis of structural buckling, the effect of geometry topology on the stability of structural system should be paid enough attentions, and mechanism displacement should also be taken into account. In this study, the essence of force-displacement curve in the equilibrium path was first clarified. With the mechanism displacement mode considered comprehensively and structures and mechanisms unified, a new method named as "Geometrically Nonlinear Force Method by Solving Kinematic Path" (GNFM-KP) was then proposed to trace the whole buckling process of structures by introducing continuous disturbance. The variation tendency of elastic stiffness, geometry stiffness and tangent stiffness of structures and their mutual relationships in the buckling process were also investigated. The validity and accuracy of the present method to trace the whole buckling paths of structures were illustrated eventually by analyzing a 24-bar star-shape space truss.

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