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Yan R.-Q.,China Urban and Rural Construction Development CO. | Li X.-J.,China Railway Construction Group Co.
Xi'an Jianzhu Keji Daxue Xuebao/Journal of Xi'an University of Architecture and Technology

The project of old industrial buildings' recycling has become the main mode of new town's construction at this stage, but there's no impeccable evaluation system for such projects. The study on this system is built upon the reasonable classification of evaluation stage. Refering to the classified methods of project management program and the project's life cycle, and using the extension discriminant method according to characteristics of the old industrial buildings' recycling project, the extension discriminant model as well as the correlation function is established to classify the evaluation stage of old industrial buildings' recycling in its entire life cycle. According to the key issue of each phase, each phase's evaluation system can be established, and is built a phased hierarchical and gradual evaluation system of the old industrial buildings' recycling. Source

Xu W.,China Academy of Building Research | Chen Y.,Beijing University of Technology | Yan W.,Beijing University of Technology | Chang L.,China Academy of Building Research | And 2 more authors.
Beijing Gongye Daxue Xuebao/Journal of Beijing University of Technology

In order to solve the problem of efficacy of the test model oriented to the self-anchored suspension bridge's construction process simulation research, an under-construction self-anchored suspension bridge was taken as a prototype. A 1/20-scale model bridge was designed and manufactured.The effectiveness of the model bridge was evaluated by the finite element analysis method. Counterweight and test scheme was designed, and then, the erection line type of cable and dynamic characteristics of main tower were tested and analyzed based on the test scheme. Numerical analysis and test results show that the test results of the erection line type of cable and the dynamic parameters of the main tower coincide well with the design value, and the test model is effective. © 2016, Beijing University of Technology. All right reserved. Source

Nie J.,Tsinghua University | Wang Y.,Tsinghua University | Tao M.,Tsinghua University | Tan W.,China Railway Construction Group Co.
Jianzhu Jiegou Xuebao/Journal of Building Structures

In practical design, the joints with outer stiffening ring were used to connect concrete beams and laminated steel tube columns. The seismic behavior of joints with outer stiffening ring with various types was studied based on experiments. The bearing capacity, rigidity, ductility, energy dissipation capacity, deformation property and strain distribution of the joints with outer stiffening ring with various types were comprehensively evaluated based on the test results of three specimens under reversed cyclic loading and finite element analysis. The test results show that the failure mode, hysteretic behavior, bearing capacity and rigidity degradation of the joints with outer stiffening ring of various types are nearly identical. Furthermore, the strain distribution of the outer stiffening ring of the three joints is nearly the same. High bearing capacity, ductility and energy dissipation capacity are observed. The improved constructional measures were proposed for the concrete beam-laminated steel tube column joints with outer stiffening ring, so that the seismic capacity of the joints could be ensured due to the convenient construction. Source

Sun L.,China Railway Construction Group Co. | Ge D.,China Railway Construction Group Co. | Ren F.,Beijing Jiaotong University | Liang R.,Beijing Jiaotong University | And 2 more authors.
Beijing Jiaotong Daxue Xuebao/Journal of Beijing Jiaotong University

Taking waste concrete in construction working place as recycled aggregate materials to make recycle aggregate concrete is the need for technology development and resource reusing. In the premise of peaceability, it can meet the need for the concrete working strength and durability. The survey points out the recycled aggregate materials is replaced as the materials under 70% natural aggregate, we can get a new type of concrete that have a level lower, and the strength and splitting strength of concrete can achieve the requirements. Mixing it with concrete C40, we can obtain concrete C35. Mixing with concrete C30, we can obtain concrete C25. Source

Han J.X.,North China Electrical Power University | Yang Y.P.,North China Electrical Power University | Wu J.R.,China Railway Construction Group Co. | Hou H.J.,North China Electrical Power University
Applied Mechanics and Materials

An experimental setup for indirect contact sensible heat TES was built. Air was chosen as the heat transfer fluid to flow inside the tubes and carry heat, while the mixture in the tank contacts the outside of the tubes. The results were also compared with pure sand filler material. It can be found that and the TES efficiency of mixture increased by 18% compared with pure sand, what’s more, its temperature gradient along the radical direction was also lower, while its temperature gradient along the axial direction was higher, so the mixture was better. Under various air inlet temperature (60-70°C), TES performances were similar, but for real power generation, further work on optimism temperature range was needed. Air velocity was also important to TES tank, lower velocity can not only increase the TES efficiency, but also enlarge the thermocline temperature gradient. © (2014) Trans Tech Publications, Switzerland. Source

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