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Li S.,Nanjing Southeast University | Li S.,Shandong Jianzhu University | Li S.,Shandong Provincial Key Laboratory of Appraisal and Retrofitting in Building Structures | Sun W.,Nanjing Southeast University
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | Year: 2013

The real construction is subjected to the coupling action of mechanical loads and environmental actions. In the ocean atmosphere environment and deicing salt environment, the damage and deterioration laws of structure concrete under the coupling action of fatigue load and carbonation and chlorides as well as the interaction between concrete carbonation and chloride ion penetration were summarized from the viewpoint of material. The effect of concrete carbonation on the chloride ion penetration and the chloride ion penetration behavior after or under fatigue load were discussed emphatically. The existing problems which should be further investigated are suggested. Source


Zhao K.,Shandong Jianzhu University | Zhao K.,Shandong Provincial Key Laboratory of Appraisal and Retrofitting in Building Structures | Wang F.,Shandong Jianzhu University | Bian X.,Shandong Jianzhu University
Advanced Materials Research | Year: 2012

The concrete-filled glass fiber reinforced gypsum wall panel is a kind of panel that the inside cavums of the glass fiber hollow gypsum panel are filled with concrete, which can be used as the bearing wall of a building. The influences of eccentricity distance and height to thickness ratio on the bearing capacity of the compression wall panels were studied, and the failure mechanism and bearing capacity of compression wall panels were gained through the experiments of twenty-seven(nine groups) axial compression wall panel specimens and twenty-seven(nine groups) eccentric compression wall panel specimens. The analysis results indicate that the bearing capacity of compression wall panels is obviously affected by the eccentricity distance and height to thickness ratio, and there is a linear relation between bearing capacity and eccentricity distance. The bearing capacity calculation formula of the concrete-filled glass fiber reinforced gypsum wall panel is obtained by regression analysis, which provides reliable gist for structural design of concrete-filled glass fiber reinforced gypsum wall panel buildings. © (2012) Trans Tech Publications, Switzerland. Source


Zhao K.Z.,Shandong Jianzhu University | Zhao K.Z.,Shandong Provincial Key Laboratory of Appraisal and Retrofitting in Building Structures | Zhu Z.F.,Shandong Jianzhu University
Applied Mechanics and Materials | Year: 2014

channel - masonry - concrete composite structures underpinning is a new type of underpinning technology, the two channel steel and the concrete of compression flange and the masonry between the channel combined into an overall flexural members, it can used in masonry structure underpinning the transformation of the wall, it has simple construction, safety and reliability, the combination of large carrying capacity and other characteristics. Through this combination of three members in bending tests, we can get, reinforced by setting off key, channel, masonry and concrete can form a combination of flexural members to work together, channels tensile stress, concrete bear stress, masonry between the channel improved stability of the web and shear capacity of the beam, we gives the flexural capacity calculation method of the composite structure through analysis. © (2014) Trans Tech Publications, Switzerland. Source


Jia Q.,Shandong Jianzhu University | Jia Q.,Shandong Provincial Key Laboratory of Appraisal and Retrofitting in Building Structures | Wang Z.-Q.,Shandong Jianzhu University
Gongcheng Lixue/Engineering Mechanics | Year: 2011

A three-dimensional finite element model was established using finite element software ANSYS. The numerical analysis on shrinkage cracks of a multi-span continuous concrete slab was conducted using the finite element model. The cast slab had 8 compartments in the longitudinal direction and 2 depths in the transverse direction. The shrinkage action of the cast slab was simulated by an equivalent temperature difference method. After a numerical calculation, the stress contour plot of the cast slab could be checked in the post-processor. The relation curves between first principle stress and the location of the longitudinal and transverse directions could be gained by the path operation method. The biggest tension stress caused by concrete shrinkage of the cast slab mainly located in the four corners and the boundaries between the wall and the slab, and the tension stress was little in the middle of the slab. Along the longitudinal direction of the slab, the tension stress caused by concrete shrinkage became bigger from an end room to a central room, and the increasing rates were from 5 percent to 7 percent. The difference of the tension stress between the longitudinal and transverse directions of the slab was small. The maximum tension stress appeared at the boundaries between the wall and the cast slab when there was no thread tube in the middle part of the slab. Because there was stress concentration phenomena due to the existence of a thread tube, the shrinkage cracks appeared at places. The shrinkage stress depended on the lateral rigidity of the walls which was direct proportional to the crossing area of the walls. The lateral rigidity of the walls could be reduced with the increasing of space. Therefore, the level of the shrinkage stress could be reduced by increasing cross-wall space. Source


Zhao K.Z.,Shandong Jianzhu University | Zhao K.Z.,Shandong Provincial Key Laboratory of Appraisal and Retrofitting in Building Structures | Liu J.J.,Shandong Jianzhu University
Applied Mechanics and Materials | Year: 2014

Concrete composite beam floor cage floor as a new form, with a saving of steel and concrete, lighter weight, the advantages of high capacity, and has been more widely used in engineering. Therefore, to carry out the new concrete composite beam floor cages fire behavior for large spaces, large span areas is necessary. This article is the use of finite element software ANSYS multi-span composite floor beams cages fire tests to simulate life and death through SOLID70 unit features analog composite bottom plate before and after bursting floor temperature field and gives composite floor box overall temperature distribution along the rib cloud cover and the temperature of the beam cross-section of different heights - time curve, finally, the simulation results and experimental conditions were compared and analyzed, the main draw the following conclusions: the use of ANSYS thermal unit SOLID70 cell function and death can be simulated temperature distribution in case of fire concrete composite floor beam floor cages before and after bursting through the ribbed section of different heights temperature - time curve can be seen, the test results agree well with the simulation results; testing process with increasing temperature, floor surface inlets, stacked boxes floor temperature contours directly reflects the law during the test floor surface appears inlets. © (2014) Trans Tech Publications, Switzerland. Source

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