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Li Y.,The Key Laboratory of Urban Security and Disaster Engineering | Li Y.,Beijing University of Technology | Li J.,University of California at Berkeley | Guo H.,The Key Laboratory of Urban Security and Disaster Engineering | Guo H.,Beijing University of Technology
Materials and Design | Year: 2015

Polymethylmethacrylate (PMMA) optical fibers with two types of diameters were uniformly arranged in sulfoaluminate mortar by different methods. Light transmitting sulfoaluminate cement-based materials (LTSCM) were prepared. Optical and mechanical properties of LTSCM were studied. The compressive strength decreased linearly with increasing volume fraction of optical fiber in LTSCM. Compressive strength of specimen after 80. °C water bath was larger than that of specimen under standard curing conditions. According to CCD technology, brightness of optical fiber in different positions of LTSCM can be exhibited clearly. Light transmitting performance of LTSCM was tested by optical power method. Transmittance of specimen decreased with increasing spacing between the detector and specimen. Optical power increased with increasing number of fiber and with increasing diameter of fiber. Transmittance of fiber was weakened due to water bath at high temperature. Voids existed between the fiber and matrix. © 2015 Elsevier Ltd. Source

Zhang Q.-X.,The Key Laboratory of Urban Security and Disaster Engineering | Zhang Q.-X.,Beijing University of Technology | Li J.-H.,The Key Laboratory of Urban Security and Disaster Engineering | Li J.-H.,Beijing University of Technology
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | Year: 2010

According to the theoretical and practical experience, the affected areas of destruction soil under the foundation is closer to circular slip surface, further less than the logarithmic spiral of traditional theory. This article assumed that the center of series the arc-shaped sliding surface were in the bottom, then according to the minimum security and stability coefficient, the determined center of a circle at the edge of the base of the foundation is the most dangerous slip surface when the overall instability of the foundation. With limit equilibrium method, the author deduce a new theory formula for calculating the bearing capacity of strip foundation. And it is taken to compare with several existing calculation methods of foundation bearing capacity to evaluate it the legitimacy and applicability of engineering practice. Source

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