Papers by Author: Fu Sheng Liu

Abstract: The reasons that the differences in temperature distributing and thermal stresses are produced in water conveying Box Bridge under solar radiation are analyzed in this paper. By FEM software ANSYS, temperature field and thermal stresses are simulated. Results indicate that temperature distribution in water-conveying concrete box bridge due to solar radiation is very complex. Temperature changes in the top plate are the most severe, followed by web-plate, with the bottom slab minimum. The actual temperature distribution can be approximately considered as conic curve. Under solar radiation considerable thermal stresses are produced in concrete box bridge both along the longitudinal and transverse direction and their value exceed tensile strength of the concrete. Therefore, thermal stresses under solar radiation must be considered in the design of water-conveying box bridge and temperature reinforcing bars should be appropriately added to the structure.

Abstract: With the development of energy-saving in buildings, new energy-saving block masonry with multi-row cores is commonly used. In this paper, from the study of typical bearing capacity of multi hole concrete block masonry of combining multiple rows of holes, holes in the multi block wall masonry capacity test of heat insulation material characteristics. Test results show that, in the process of multi hole masonry brittle failure characteristics, built-in straw block in the insulation at the same time, can improve the compressive strength of masonry; masonry local diffusion mechanism under the action of stress is significant; and offer the engineering measures.

Abstract: Stalk concrete block was made of compressed wheat stalk brick and hollow concrete block. Experimental study on heat preservation performance of stalk concrete block and stalk concrete block was carried out. Average heat transfer coefficient of experimental wall made by hollow concrete block is 1.57 W/m².K and stalk concrete block is 1.08W/m².K. Performance of moisture transfer of compressed wheat stalk brick was acquired by using thermostatic and humidistat chamber. Profile of humidity absorption and release was also acquired. The maximum moisture content of compressed wheat stalk brick is 8.85 %. Relative humidity in certain space can be controlled within 50 % -65%.

Abstract: As the common waste of the production in daily life,a large number of stone powder, fly ash, coal gangue was abandoned, and it causes large tracts of land was occupyed and the environment was polluted. Therefore it is great singnificance to saving resources and protecting environment by studing the impact of the three kinds of wastes as mineral admixtures on the properties of concretetTest shows that when the replacement rate of the three kinds of admixture is 20%, the replace quanity is considerable and the basic requirements on compressive strength, the anti-permeability performance, frost resistance of the concrete can be satified;when the replace content of the stone powder or fly ash is 30%, the performance of the concrete decreases, it only can be applied in the engineering whose quality requirement is relatively low; the properties of the concrete can't meet the requirement of the engineering application when the the replacement rate of the coal gangue is 30%.

Abstract: Wheat straw alkali treatment has impacts on the strength of cement mortar and glazed hollow beads insulation mortar. The results show that the bending strength and bending strength of cement mortar specimen with 4% wheat straw are respectively 58.3% and 40.9% of the benchmark specimen, but bending-press ratio of the latter is 1.42 times of the former. The SEM images reflect the straws influences on the cement hydrate morphology, status and the influence of the number on cement mortar and glazed hollow beads insulation mortar. Compared with the latter, the former C-S-H gel is loose fibrous, failure to form a good network. In the thermal insulation mortar consistency and stratification of the same circumstances, with straw dosage increased, strength first increases, then declining. And folding pressure than in straw dosage is less than 24% more ideal. The SEM pictures show that network C-S-H gel decrease and loose fibrous C-S-H gel increased. At the same time, AFt gradually become attenuate and curly.

Abstract: Dynamic analysis can be carried out quickly and accurately for the seismic performance of dam by using the finite element software. Added massed method is used for the dynamic water. Horizontal earthquake acceleration is 0.2G; vertical earthquake acceleration is two-third of horizontal earthquake acceleration; sub space iteration method is used for the modal analysis of the dam; Finding the maximum response-order mode shape, and then useing a combination of square and square root method to come to the conclusion of overall seismic response. The stress and strain of the dam had been analyzed and the weak link of key parts of the dam had been summarized in this article.It is concluded that seismic design requirement are satified for the dam.

Abstract: Abstract: The experimental research on the effect of different incorporation of granite powders on the workability, mechanical property and impermeability performance of concrete is carried out. The result show that the concrete with an appropriate dosage of granite powder exhibits favorable workability, impermeability performance and cohesiveness. And granite powders agree with cement-based materials. Within some dosage of granite powders, the compressive strength of the mixture is approximate to that of common concrete. When the 10% of cement was replaced by the granite powder, good impermeability performance exhibits, with the relative permeability coefficient 30% lower than that of common concrete.

Abstract: large amount of granite powders wastages were produced during the process of the stone processing, therefore the research on recycling and utilizing the wastages was carried out. Based on the size distribution of granite powders specified by the laser particle size analyzer, the research on the influence of granite stone powder on the mechanical properties of cement mortar was carried out through the cement grinding test and scanning electron microscopy (SEM). The test result shows as follows. The flexural and compressive strength of cement mortar with replacement rate of granite stone powders of 20% is the highest when the same particle size of granite stone powder is incorporated. When the replacement rate of granite powders is the same, the smaller the particle size of granite stone powder is, the higher the flexural and compressive strength of cement mortar is. When the replacement rate of granite powders is 20%, with the particle size ranging from 0μm to 45μm, the filling effect of the granite stone powder can be fully utilized to the best.

Abstract: For the time being the theory about the failure mechanism of the soft rocks, mechanical behavior of bolting-grouting support body in soft rocks has not been fully comprehended. The design of the bolting-grouting support is mostly based on experience and by analogy, and the theoretical analysis results are far more different with the practical engineering. To solve the problem, the researches on the bolting-grouting support mechanism of the soft rocks and the interrelationship between characteristic parameters of the surrounding rocks and structural parameters of bolting-grouting support body are carried out based on the nested models of original surrounding rocks and the bolting-grouting structure. The qualitative and quantitative relationship between characteristic parameters of the surrounding rocks and structural parameters of bolting-grouting support is found out. At the same time, it could also provide beneficial reference to the practical engineering design and construction.

Abstract: Free field response of partially saturated sands to cyclic loading, with a particular attention to soil liquefaction has been studied. The study has been conducted using a numerical model elaborated for the liquefaction of partially saturated soils together with a cyclic elastoplastic constitutive relation implemented in a finite element program. The numerical model and the analysis of the influence of soil saturation on the free field response, for different positions of the water table have been investigated respectively. The result shows that the soil saturation degree largely affects the free field response to cyclic loading, with a decrease in soil saturation leading to a decrease in the rate of generation of excess pore-water pressure, and consequently to a reduction in the liquefaction risk.