Abstract：The design calculation of special lifting platform for calcium silicate board production line and the influences of structural dimension design on its drive force are introduced. Design steps, design key points and application situation are analyzed.
Abstract: An optimized design method of new slab structure is offered. By applying this method, the structural parameters of composite exterior wall slab are optimized, and the influence of properties of the surface layer and core layer materials on the optimized result is analyzed.
Abstract: According to inhomogeneity of component steel corrosion in practical engineering, 14 RC beams are designed, and under the roles of symmetrical concentrated loading, shear properties tests of testing beams are conducted. Through crack distinctions, contrastive analysis of damage modes and limited capacity of different characteristic testing beams, the influences of different corrosion characteristic of the partial section with different lengths in one side shear span on beams mechanical properties and bearing capacity are researched. The results indicate that mechanical properties beteween unbonded or corroded beams of the partial section in one side shear span and normal beams have a lot of differences: because of completely unbonded in partial section, unbonded beams of the partial section in unbonded side shear span have no diagonal cracks, therefore, beams may happen shear damage in good bonded side or will happen bending damage. For the corroded beams in partial section, all samples are destroyed because of corrosion section in shear span, however, by the length of corrosion section increasing and steel corrosion rate inside increasing, fragile damage modes and low limited capacity of beams are presented.
Abstract: Based on the importance of interface in composite materials，the interfacial properties between fiber and cement-based materials and usual testing methods are introduced in carbon fiber reinforced cement composites. At the same time, composition of interface in cementitious materials and improving measures of structures are summarized，which are formed by fibers(steel fiber or polypropylene fiber) or new inorganic mineral microfiber--CaCO3 whiskers mixed.
摘 要：研究了聚酯纤维和碳纤维硫铝酸盐水泥混凝土的力学性能。结果表明，在90d龄期时，聚酯纤维和碳纤维硫铝酸盐水泥混凝土的抗压强度分别达到了58.9MPa、52.4MPa，比同龄期素混凝土试样分别提高了25.6％ 和12.0％；而劈拉强度分别达到了5.77MPa和5.11MPa，比同龄期素混凝土试样分别提高了41.1％ 和24.9％。碳纤维和聚酯纤维对硫铝酸盐水泥混凝土均有明显的约束裂缝扩展的能力，表现为在28d龄期时，碳纤维混凝土的断裂能达到113.4kJ，比基准混凝土提高了28.1％，而聚酯纤维混凝土的断裂能则达到了139.8kJ，比基准混凝土提高了58.0％。
Abstract: The mechanical properties of polyester fiber and carbon fiber reinforced sulphoaluminate cement (SAC) concrete are researched. The results indicate that the compressive strengths of polyester fiber and carbon fiber reinforced SAC concrete are as high as 58.9MPa and 52.4MPa respectively at 90 days age, which are increased by 25.6% and 12.0% respectively, compared with plain SAC concrete at the same age. The splitting tensile strengths of polyester fiber and carbon fiber reinforced SAC concrete are as high as 5.77MPa and 5.11MPa respectively at 90 days age, which are increased by 41.1% and 24.9% respectively, compared with plain SAC concrete at the same age. The function of carbon fiber and polyester fiber to limit the development of cracks propagation for SAC concrete is obvious, and the fracture energy of carbon fiber reinforced SAC concrete is as high as 113.4kJ at 80 days age, which is increased by 28.1% compared with plain SAC concrete. The fracture energy of polyester fiber reinforced SAC concrete is as high as 139.8kJ at the same age, which is increased by 58.0% compared with plain SAC concrete.
Abstract: Because of the extension process of concrete cracks, physical models of enhancing role of hybrid fibers reinforced concrete with different sizes are established, and the models are verified by the testing results. The results show that the values of models and testing results are the same, which provide the certain theory of material design of hybrid fibers reinforced concrete.