摘 要：为了计算型钢混凝土叠合梁施工阶段的开裂弯矩、变形和裂缝宽度，完成了6根型钢混凝土叠合梁底部预制构件的静力试验，在试验的基础上重点分析了开裂弯矩、刚度和裂缝宽度公式，并通过参考相关文献，得出计算公式。计算结果表明，用本文公式计算得到的理论值与试验值吻合良好。 Abstract: In order to calculate the cracking moment, deformations and the crack width during the construction phase of the steel reinforced concrete composite beam, static tests are carried out on the bottom prefabricated components of six steel reinforced concrete composite beams. On the basis of the tests, the cracking moment, stiffness and crack width formulas are mainly analyzed. By referring to relevant literature, the formulas are obtained. The results show that the theoretical value calculated by the formulas in this paper are in good agreement with the experimental ones.

摘 要：钢管混凝土梁承载力优化问题一直是工程界比较关心的问题，通过引入强重比的概念，对比分析了钢筋混凝土梁构件和钢管混凝土梁构件的强重比。分析结果表明，强重比越大，构件的承载力和性能就越好。同时利用有限元软件ABAQUS对其承载力进行参数优化分析，通过参数优化分析进一步提高钢管混凝土梁的承载力，以满足实际工程的需要。 Abstract: The optimization of bearing capacity of concrete-filled steel tubular beams has always been concern of the engineering community. The strong weight ratio of the reinforced concrete beams and concrete filled steel tubular beams are comparative analyzed. The results show that the bearing capacity of the beams is increasing with strong weight ratio, and the finite element software ABAQUS is used to analyze the parameter of bearing capacity. Through the parameter optimization analysis, the bearing capacity of the concrete-filled steel tubular beam is further improved to meet the needs of actual engineering.

摘 要：PKG预制底板是直接在2.4~6.0 m跨PK预应力混凝土预制底板的混凝土肋上外包内卷边C型槽钢所得，其特点是工业化预制程度高，预制过程支模简单、有利于成品保护，预制底板及其叠合后的叠合楼板刚度大。由于PK预制底板受力性能均已满足规范要求，外包型钢后，其力学性能有很大富余度。本文研究了PKG板的截面参数，并编制了仅输入板跨和板宽即可进行PKG板迭代设计计算的MATLAB程序，对2.4~6 m跨PKG预制底板考虑最小用钢量时的肋高、预应力钢筋数目等进行了截面优化和规整化设计，利用程序迭代设计计算了6.3~9 m跨的PKG预制底板，最终设计出了截面合理、力学性能优异的既满足规范要求又适合于工业化生产的PKG预制底板；并对PKG叠合楼板的工业化生产与施工进行了介绍，可为PKG预制底板的设计及叠合板的生产、施工提供参考。 Abstract: The PKG precast baseplate is directly to outsource inner edge C channel steel on concrete ribs of the PK prestressed concrete precast baseplate within the span of 2.4~6.0 m, which has such advantage as high degree of industrialized precast, formwork rectification of prefabricated process is simple, and it is advantageous to the finished product protection, stiffness of precast baseplate and composite slab is big. Since the performance of the PK precast baseplate has contented the requirements of the specification, the mechanical properties of the outsourced section steel have a great degree of redundancy. The section parameter of the PKG slab is studied, and the MATLAB program that can be done iterative design and calculation of the PKG slab only inputing span and width of slab has been designed, the costal height, the number of prestressed reinforcement bars and so on of the PKG precast baseplate that has considered the minimum amount of steel have been carried the section optimization and regularization design within the span of 2.4~6.0 m, and the iterative design program was used to calculate the PKG precast baseplate within the span of 6.3~9 m. Finally, the PKG precast baseplate with reasonable section, excellent mechanical properties, contenting the specification requirements and suitable for its industrialized production was designed, and the industrial production and construction of PKG composite slab are briefly introduced, which can provide a reference for the design of the PKG precast baseplate and production construction of the PKG composite slab.

摘 要：在粗骨料（废弃混凝土）取代率为100%的再生混凝土中分别掺加2%、5%和8%的20目、40目和60目橡胶粉，按照相同的水灰比、砂率、强度等级配制了129个胶粉再生混凝土试件进行室内试验。结果表明，抗压强度随橡胶粉掺量的增加及粒径的减小而降低，抗折强度先增加后降低，而抗冲击韧性和抗冻性得到显著改善；再生混凝土中掺加5%的40目橡胶粉其路用性能最优。 Abstract: 2%,5% and 8% of rubber powder with 20mesh,40mesh and 60mesh are respectively added to the recycled concrete with 100% replacement of coarse aggregate，129 recycled concrete specimens are prepared for laboratory tests by the same water-cement ratio, sand rate and strength grade. The results show that the compressive strength decreases with the increase of mixed quantity and the decrease of the particle size rubber powder. The flexural strength increases first and then decreases, and the impact toughness and freezing resistance are improved significantly. The recycled aggregate concrete can reach the best pavement performance when mixed with 40 mesh, 5% rubber powder by comprehensive consideration.

摘 要：根据Weibull统计分布理论推导了钢纤维混凝土（SFRC）的损伤本构模型，基于试验数据得到了SFRC模型参数。利用ANSYS软件在细观上建立钢纤维混凝土立方体试件有限元模型，并对其单轴压受力下的力学性能和破坏状态进行了数值模拟，研究钢纤维长径比对钢纤维混凝土抗压强度的影响。结果表明，SFRC细观模型能较好的模拟单轴受压下混凝土的静力学性能和损伤破坏。 Abstract: According to Weibull Statistical Distribution Theory, the damage constitutive model of SFRC is derived, and the SFRC model parameters are obtained based on the test data. The finite element model of steel fiber reinforced concrete cube specimen is established by using ANSYS. The mechanical properties and failure state under uniaxial compression stress are numerically simulated to study the effect of aspect ratio of steel fiber on the compressive strength of steel fiber reinforced concrete. The results show that the meso mechanical model of steel fiber reinforced concrete can simulate the static and damage properties of concrete under uniaxial compression.

摘 要：以原料形态为石灰石和卵石的两种机制砂作细骨料，通过配合比设计，研制出了 C60、C80、C100 机制砂高强混凝土,研究了机制砂原料形态以及不同石粉含量（3%、5%、7%、10%）对高强机制砂混凝土工作性能和抗压强度的影响。结果表明，机制砂原料形态对高强机制砂混凝土工作性能和抗压强度影响较为显著；石粉含量对高强机制砂混凝土工作性能影响较大，对强度影响较小；石粉含量小于等于7%时，两种原料形态的高强机制砂混凝土均具有良好的工作性能与力学性能，满足结构设计要求，研究结果可为工程实际应用提供参考。 Abstract: The high-strength manufactured sand concrete with strength grades of C60, C80 and C100 are prepared by using concrete mix design methods. Two forms of raw materials,i.e., pebbles and limestone are adopted. Further, the effect of two key factors associated with raw materials of manufactured sands and contents（3%，5%，7%，10%）of stone powder on workability as well as compressive strength of manufactured sand concrete is investigated. The results show that the raw materials of manufactured sands have significant effects on the workability and compressive strength of high-strength concrete. The contents of stone powder have strong effect on the working performance of high-strength manufactured sand concrete, while small effects on its compressive strength. When the content of stone powder is less than or equal to 7%, the high-strength manufactured sand concrete with two kinds of raw materials has good workability and mechanical properties, and can meet the requirements of structural design. The results can provide reference for practical use.