Evaluation of Structural Performance of Reinforced Concrete Structures Considering Durability

完成了2000 - 2002会计年度为期3年的研究工作，所得结果总结如下：本文收集和回顾了以往关于考虑耐久性的钢筋混凝土结构性能评价的研究成果，以表明当前研究的立场和未来需要开展的工作。对不同龄期的混凝土试件进行了断裂试验，研究了骨料对断裂面轮廓和断裂模式的影响。此外，微观材料参数，表征表征的中尺度分析模型称为“颗粒模型”，通过本研究开发的，进行了评估。考虑所识别参数的颗粒模型计算结果表明，所提出的颗粒模型对研究混凝土细观尺度断裂行为是有效的。为了提高混凝土结构的延性和抑制其损伤，开发了Duc…More tile纤维增强胶凝复合材料（DFRCC）及其材料性能评价方法。3 .通过循环侧向荷载作用下，对DRFCC和普通混凝土的剪力墙试件进行了试验和有限元分析，证实了DFRCC剪力墙的延性和强度较RC剪力墙有较大提高。混凝土浇筑后硬化过程中，任一混凝土构件均可能产生收缩应变。在考虑收缩应变引起的初始应力的情况下，采用有限元法对RC板进行计算，结果表明初始应力对RC板开裂行为的影响是显著的。在此基础上，采用无损检测方法对受弯破坏的RC梁进行了断裂试验，明确了其空间损伤分布以及损伤与结构性能的关系。采用宏观模型和有限元方法，研究了钢筋混凝土梁强度和延性的尺寸效应、钢筋混凝土柱在剪切破坏下的循环劣化、钢筋混凝土梁柱节点的破坏模式和阻力机理、剪力墙的三维静力和二维动力性能，并对分析方法的有效性和各构件的结构性能进行了研究。少

3 years research work from the fiscal year of 2000 to 2002 was completed and the results obtained are summarized as follows.1. The past research results dealing with evaluation of the structural performance of RC structures considering its durability were collected and reviewed to demonstrate a position of the present study and future works to be conducted.2. The fracture test on concrete specimens with different ages was carried out, and effect of the aggregates on the profile of fractured surface and the fracture mode was investigated. In addition, the microscopic material parameters, which characterize a meso-scale analysis model called "particle model" developed through this study, were evaluated. The results obtained by the particle model considering the identified parameters indicate that the proposed particle model is verified to be effective to investigate meso-scale fracture behaviors in concrete.3. In order to enhance ductility and restrain damages of concrete structures, Duc … More tile Fiber Reinforced Cementitious composite called "DFRCC" was developed as well as method for evaluating material performance of DFRCC. Then the test and FE analysis on the shear wall specimens with DRFCC and normal concrete were conducted under cyclic lateral loading, and it was confirmed that ductility and strength of DFRCC shear wall is much improved in comparison with those of RC shear wall.4. Shrinkage strains may be caused in any concrete members during hardening process of concrete after casting. The results on the RC panel calculated by FEM, which takes an initial stress due to the shrinkage strain into consideration, indicate that effect of the initial stress on cracking behavior of the RC panel is significant. Furthermore, fracture test on the RC beams failing in flexure was conducted using the nondestructive testing method, and spatial damage distributions and relation between damage and structural performance were clarified.5. Size effect in strength and ductility of the RC beams, Cyclic deterioration of the RC columns failing in shear, failure mode and resistance mechanism of RC beam-column joints and 3-D static and 2-D dynamic behaviors of the shear walls were investigated using the macroscopic models and FEM, and efficiency of the analysis methods and structural performance of each members were investigated. Less