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Liang J.-G.,Changsha University of Science and Technology | Cheng S.-H.,Hunan Construction Engineering Group Corporation | Peng M.-F.,Hunan Agricultural University
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology)

In order to avoid cracking in autoclaved fly-ash brick masonry walls due to drying shrinkage, the drying shrinkage of autoclaved fly-ash brick with different relative moisture contents in different relative humidities were tested using rapid method and comparatively slow method. The test results show that the drying shrinkage of autoclaved fly ash brick using rapid method is 48% of that using slow method, and the drying shrinkage of autoclaved fly ash bricks in service stage increases with the increase of relative moisture content and decreases with the increase of relative humidity. The moisture content factor, the relative humidity factor as well as the age factor can be obtained by regression analysis of the test results. The predicting formula of the drying shrinkage of autoclaved fly-ash brick in service stage is obtained. Source

Sun C.,Hunan Construction Engineering Group Corporation
Proceedings - 2013 4th International Conference on Intelligent Systems Design and Engineering Applications, ISDEA 2013

After reviewing the historical origin of China s expressway management system, the paper analyzes the current highway management system from construction managements, trade management, operation management and traffic management, and puts forward the concrete thinking ways of reforms for the expressway management system that can strengthen the government macro-adjust and controls, perfect the legal system, push forward the enterprise license running, and realize the express highway scale benefit etc. © 2013 IEEE. Source

Chen W.,Changsha University of Science and Technology | Chen W.,Hunan Construction Engineering Group Corporation | Yang W.,Changsha University of Science and Technology | Li Y.,Changsha University of Science and Technology
Applied Mechanics and Materials

Based on the properties of lightweight aggregate concrete, the yield curvature and the ultimate curvature are calculated by numerical method, and the relationship between curvature ductility ratio and displacement ductility ratios is established for lightweight aggregate concrete shear wall. It is shown that the calculating results agree well with experimental results. The major influencing factors for ductility of lightweight aggregate concrete shear wall include with or without constrain edge conponent, the characteristic value of stirrup of constrain edge conponent, the axial compression ratio and the height-width ratio and so on. © (2012) Trans Tech Publications, Switzerland. Source

Zhou H.,Hunan University | Zhou H.,Hunan Construction Engineering Group Corporation | He Y.,Hunan University | Guo J.,Hunan University | Li Y.,Hunan University
Tumu Gongcheng Xuebao/China Civil Engineering Journal

Composite columns combine the merits of steel-reinforced concrete and steel tubular concrete. To study the seismic performance of composite joints with steel-reinforced concrete-filled steel tubular columns and steel-reinforced concrete beams, four full-size cruciform specimens categorized in two groups were tested under cyclic loading at the send of the beams. Two strong joints and two weak joints were designed according to the relative strength of composite columns and beams. The test results show that this new type of composite joints performs excellently in seismic actions. The hysteretic curves of strong joints are plump, while in contrast, such curves are in reversed S shape for the weak joints. The strength and initial rigidity of weak joints are better than those of strong joints, but the ductility and energy dissipation are worse at the end of the tests. It is thus concluded that the strong joints are more practically applicable. The inner steel-reinforcement can serve as a second line of defense to earthquakes. Source

Yi W.,Hunan University | Shen H.,Hunan University | Cheng C.,Hunan Construction Engineering Group Corporation
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology)

In order to quantify seismic risk, risk indicators were selected first, hazard analysis, vulnerability analysis and loss analysis were carried out using the CAPRA (central American probability risk assessment) platform with each sub-module, finally the values of risk indicators such as physical loss and human loss were obtained. The risk indicators were standardized, and then regional holistic risk index RT was taken as the weighted sum of the importance of risk indicators based on multi-criteria evaluation method. The greater the regional holistic risk index, the greater the regional seismic risk was. Physical loss, human loss and social impact were selected as risk indicators and taking Sichuan Province (China) as an example, the seismic risk values of each city were gained through this method. The results show that places like Meishan, Ziyang, Guangyuan, Chengdu and Leshan pose a higher seismic risk, but seismic risk of Aba, Ganzi, Liangshan, Dazhou and Luzhou is quite smaller, which can give some references for Sichuan's house siting, risk mitigation and urban risk management. ©, 2015, Central South University of Technology. All right reserved. Source

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