Systematical researches were carried out on the cleavage strength of steel fiber concrete with 3 base strength grades,6 steel externalities and 4 fiber admixtures,and it is discovered that the cleavage strength of concrete increases as the base strength grade rises,and dumbbell-like,shield-like and hook-like steel fibers have good reinforcement effect while flat steel fiber has less reinforcement effect.

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Directed toward problems of the bridge superstructure, the thesis put forward proper reinforcement method—reinforcement on the extrados.

論文針對(duì)橋梁上部結(jié)構(gòu)病害情況提出了合理的加固方案：拱背補(bǔ)強(qiáng)法，并為結(jié)構(gòu)加固設(shè)計(jì)進(jìn)行了理論推導(dǎo)欧美激情一级黄片搜索。

It was necessary that the frontispiece of face was pre-supported in the especial stratum. Fourthly, by the model analytic value and the FEM numerical simulation, the advance reinforcement parameters were analyzed roundly, and its results explained that the parameters had optimal values. A series of formulations conforming loads born up for pre-reinforcement structure were given, and five rules for its design and choice were put forward.

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The results show that the gabion meshes present good tensile characteristics in the event of the rupture of the meshes. The larger-diameter gabion mesh shows a better mechanical performance, and the mechanical performance of 80RE geogrid is superior to that of 70RE geogrid. The revised relationship curves between the tension per unit width and unit elongation also present elastic stage, yield stage and strength stage. The constraint deformation of reinforcement is influenced by factors such as secant modulus of materials, stress levels, and the length of reinforcement in active area and stable area.

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For the PUU/BO-g-VER (n-butanol graft VER network)hybrid film, the miscibility between the soft and hard segments in PUU phase was improved byadding the BO-g-VER network into PUU, resulting in remarkable reinforcement effect andgreat improvements of mechanical properties for the films. In the PUU/200-g-VER [Mn: 200,poly graft VER], the 200-g-VER network had considerable compatibility withboth hard segments and soft segments in PUU phase, then good reinforcement effect wasrealized, giving rise to higher tensile strength and elastic module, lower elongation at break ofthe hybrid films.

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Aiming at the measure of expressway slope protection with greensward in China at present the reinforcement mechanism is analyzed and the reinforcement effect is studied experimentally .

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On the basis of making it clear that laterization includes such three integrated stages as weathering, micro-granularity and soil formation of laterite, the thesis illuminates characteristics of Kunming laterite in chemical composition, physical mechanics, composition of granules, fractal dimension of granularity and the connection of granules. The experiment using soil reinforced agent to solidify the laterite shows that the mechanical traits of laterite have been improved because of its involvement, the best compact indicators and shear strength ones increased and the indicators of laterites penetrability and compression decreased. The effects of reinforcement can be weighed through its coefficient and the mechanism of reinforcement can find the explanation in the effect of soil reinforced agent on the laterite granules, the changes in the electric double layer caused by soil reinforced agent and its enwrapping of laterite granules.

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Moreover, it is closely related to the crystal structures of reinforcement and matrix alloy. The formation of above crystallographic relationships is valuable to decrease the energy of lattice strain between reinforcement and matrix alloy.

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The paper also presented the detailed experimental analysis on the combined technology of ozonization, engineering bacteria reinforcement and aeration, included the functions of different units in the system and demonstrated the superiority and necessity of the combined application of the ozonization, engineering bacteria reinforcement and aeration.

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Based on the low cyclic loading experiments on one brick masonry wall with ordinary pilaster and eight specimens of masonry walls with pilaster strengthened by GFRP, the failure characteristics of the walls are explained; seismic performance characteristics, such as resilience, rigidity and its degeneration, deformation, and energy dissipation are studied; and influence of the measures including strengthening means, reinforcement area proportion between GFRP and wall surface,"through-wall" anchorage reinforcement effects are studied.

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