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Li S.,Nanjing Southeast University | Ding J.,Suzhou Institute of Architectural Design Co. | Zhang X.,Nanjing Southeast University | Cheng D.,China Construction | And 2 more authors.
International Journal of Low-Carbon Technologies | Year: 2016

A new CO2 cryogenic capture and liquefaction system has been proposed previously in order to separate CO2 from exhausted gases and make it as a resource for industry. This system combines CO2 cryogenic capture with N2/O2 separation together. Its energy consumption is lower than the traditional amine solution capture process as theoretical analysis. In this study, the simulation of the proposed system with several improvements was carried out aiming to reduce the energy consumption further. Many heat exchangers were introduced and the heat exchanger arrangements were optimized to recycle the refrigeration capacity from the returned N2 after the N2/O2 separation. The discharge pressure of mixture gas from the compressor was reduced from 10 to 3.493 MPa. The simulation results showed that the compression work could be greatly reduced and the energy consumption of CO2 capture in this new system after these improvements reached 2.884 GJ/ton CO2. The new system is promising because not only liquid or solid CO2 could be produced but also N2 and O2 could be separated. © The Author 2013. Published by Oxford University Press.

Sun J.,Nanjing Southeast University | Qiu H.,Nanjing Southeast University | Lu B.,Suzhou Institute of Architectural Design Co.
Journal of Southeast University (English Edition) | Year: 2015

To investigate the feasibility and seismic performance of the horizontal joints in an innovative precast shear wall system, two test walls were fabricated, and the monotonic and cyclic loading tests were performed on the two test walls, respectively. Then, the lateral load-top displacement curves, load bearing capacity, ductility, lateral stiffness, strains of steel bars, strain distribution on the connecting steel frame (CSF), and relative slippages between the CSF and embedded limbic steel frame (ELSF) were discussed in detail. The test results show that the load bearing capacity and ductility of the test wall are both favorable with a displacement ductility factor of more than 3.7. The normal and shear stresses in the CSF except for the compression end are far smaller than the yield stresses throughout the test procedure. Certain slippages of about 1.13 mm occurs between the CSF and ELSF on the compression side of the test wall, while almost no slippages occurs on the tension side. The seismic performance of the test wall is favorable and the new-type scheme of the horizontal joints is both feasible and reliable. ©, 2015, Southeast University. All right reserved.

Sun J.,Nanjing Southeast University | Qiu H.X.,Nanjing Southeast University | Yang Y.,Nanjing Southeast University | Lu B.,Nanjing Southeast University | Lu B.,Suzhou Institute of Architectural Design Co.
Science China Technological Sciences | Year: 2015

To study the deformability and ductility of an innovative precast shear wall joined by bolted connections, experimental tests were conducted on two test walls under monotonic and cyclic loading, respectively; subsequently, theoretical analysis was performed on the deformation performance of the shear wall assembly. The test results confirmed the favorable deformability and ductility of the specimens. The top displacement of the shear wall assembly was analytically decomposed into several constituent parts, the theoretical formulae of which were subsequently deduced. The compositional analysis demonstrated that the top displacement of the test wall was primarily induced by the elastic deformation of the upper wall panel (UWP), the relative slippages within the bolted connections, and the flexural deformation within the plastic region of the UWP, while the constituent part contributed by the deformation in the connecting steel frame can be neglected. © 2015, Science China Press and Springer-Verlag Berlin Heidelberg.

Li X.-J.,Nanjing Southeast University | Dai G.-L.,Nanjing Southeast University | Gong W.-M.,Nanjing Southeast University | Xu W.-X.,Suzhou Institute of Architectural Design Co. | Wang L.,Nanjing Southeast University
Yantu Lixue/Rock and Soil Mechanics | Year: 2016

In the self-balanced loading test, reasonable determination of conversion factor γ, ratio of downward shaft resistance to upward shaft resistance, is critically important for the accuracy of bearing capacity and final decision of pile loading test. To study the appropriate value of γ in sandy soil, 3 typical construction projects are chosen. All of their main soil layer are sandy soil; and the self-balanced loading test and head-down loading test are conducted at every site. And then a pile from self-balanced loading test and one from head-down loading test are picked as a group. In these groups, the geometrical sizes, geological condition and construction method of the two piles are same or similar. Because the results from traditional loading test are more convincing than ones from self-balanced loading test in general, the results from top-down loading test are taken as references; and then the Matlab is used to find the optimal fitting solution of γ, latterly, returning the value to the simplified capacity equation of the self-balanced loading test, and comparing the result of equivalent top-loaded settlement curve with ones from γ used in actual project and from head-down loading test, γ = 0.6 and 0.7. The results show that: (1) The fitted values of γ from 3 projects are ranged from 0.47 to 0.71, which are rather smaller than that used in actual projects. (2) The accuracy of γ has large effect on the values of Qs (skin friction) and sss (elastic compression from skin friction distribution) of upper piles of the equivalent pile. (3) Compared with the top-loaded settlement curve from traditional loading test, the results from the optimal fitting solution of γ fit much better than of which used in actual project,which means that values of γ used in these projects are overly conservative, which cause overly conservative judgement of bearing capacity. (4) It is suggested that the value of conversion factor γ in sandy soil about 0.6 to 0.7. © 2016, Science Press. All right reserved.

Wang Z.,Harbin Institute of Technology | Liu J.-J.,Suzhou Institute of Architectural Design Co. | Wu B.,Harbin Institute of Technology | Xu G.-S.,Harbin Institute of Technology
Zhendong Gongcheng Xuebao/Journal of Vibration Engineering | Year: 2015

Real-time Hybrid Testing (RHT) is a novel hybrid testing method for evaluating structural seismic performance. Even though implicit time-stepping approaches exhibit better stability, their applications to RHT are limited due to their difficulties. This paper firstly analyses limitations of two existing implicit RHT schemes for Multi-Degree of Freedom (MDoF) structures, and then proposes a new implicit RHT based on the nearly-complete delay compensation developed by the authors formerly. Theoretical performance analysis and numerical simulations are performed following that. Numerical simulations show that the proposed scheme is endowed with better convergence speed and accuracy and incorporates delay compensation, which indicate that it is more suitable to RHT for MDoF systems. ©, 2015, Zhendong Gongcheng Xuebao/Journal of Vibration Engineering. All right reserved.

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