In this paper, a method of stress-strain relation of concrete under triaxial loading is proposed. The method is based on an orthotropic model of three dimensional equivalent increment. Bathe's approach of the stiffness matrix is used for reference. The failure criterion for concrete by Ottosen and the peak strain criterion by Ahmad are adopted in the model. Compared with the experimental data by Richart, the theoretical results are found to have a high accuracy. Another distinguished advantage of the approach is that only a few material parameters are needed to be determined when the method is applied.

工程实践中，不规则形状楼板的受力较为复杂，是实际计算和配筋中有待解决的问题。本文采用条带法（Strip Method）对L形楼板进行分析。在此基础上提出了安全、简化的配筋方式。

This paper presents a general approach to deal with the failure analysis of reinforced concrete columns strengthened with carbon-fiber-reinforced plastic (CFRP) sheets including bond-Slip and discusses the effects of the bond-slip & anchorage of the longitudinal reinforcing bars. It is based on the yield design theory with a mixed modeling of the structure, according to which, firstly, the concrete material and the longitudinal reinforcing bars are treated as classical three-dimensional continuum and in shear reinforced zones both the shear CFRP sheets and transverse reinforcing bars are incorporated in the analysis through a homogenization procedure and they are only in tension; Secondly, the finite element in the footing is flexibility-based, but in the column it is stiffness-based. The method is then implemented numerically by means of the finite-element formulation, thus produces accurate estimates for the response of the concrete members strengthened with CFRP sheets taken ad an illustrative application. Numerical predictions are in good agreement with the experimental results.

碳纤维增强钢筋混凝土结构技术是一种新型的结构补强技术。本文研究了一种用于确定地震区的碳纤维布增强钢筋混凝土柱的受剪承载力的近似计算方法。试验分析表明：箍筋与碳纤维布的主要作用不是单纯抵抗剪力破坏或提高轴向压力作用下柱的变形能力，更重要的是它们约束了混凝土在复杂应力状态下的变形。本文考虑了在柱顶发生最大水平侧移的情况下，剪应力与正应力的共同作用效应，并用莫尔库仑破坏准则进行了分析解释，并且用本文模型的分析结果与文献[1]的结果进行了比较。

Concrete structure is adopted the most widely in construction structure. Owing to being exposed to outdoors environment for a long period of time, concrete structures are corroding and failure, the reliability and durability are becoming a very important study subject. Alkali aggregate reaction (AAR) is one of main structural calamity causing damage, and influence reliability and safety of concrete structures. This paper applies artificial neural network theory and reliability analysis theory to explore an analysis method at evaluating damaged concrete structures.

影响钢筋混凝土受弯构件斜截面受剪承载力的因素诸多，目前，世界各国尚未建立统一完整的受剪承载力的理论模式和计算方法。我国现行《混凝土结构设计规范》中的钢筋混凝土受弯构件斜截面受剪承载力设计公式和截面限制条件，采用混凝土的轴心抗压强度为设计指标，随着混凝土工程技术的发展和高强度混凝土的广泛使用，需要进一步研究现行设计公式的适用性。本文研究强度等级C20～C80混凝土的抗剪强度特征，讨论了现行设计公式及截面限制条件存在的问题。在此基础上，对新规范建议的受剪承载力公式进行了分析。

本文通过对一榀两跨三层的方钢管混凝土框架在低周反复荷载作用下的抗震性能的研究，对比钢筋混凝土结构，对两者的变形能力、刚度退化等抗震性能进行比较。结果表明，与钢筋混凝土结构相比，方钢管混凝土结构具有良好的抗震性能。本文为方钢管混凝土结构的抗震设计提供参考。

钢筋混凝土浅梁和深梁受剪承载力计算公式的衔接一直是尚未较好解决的课题。本文在分析浅梁、短梁和深梁破坏特征及主要影响因素的基础上，根据深受弯构件受力模型，探讨了深梁、短梁和浅梁的衔接，分析了与混凝土、竖向分布钢筋和水平分布钢筋的受剪承载力对应统一的深受弯构件受剪承载力计算公式。

本文对新《混凝土结构设计规范》（GB500010-2002）斜截面受剪承载力计算公式用于复杂载荷作用下的情况进行分析研究，对采用不同计算公式引起的配箍筋的差异进行了分析,并提出了改进的计算方法，可供工程设计计算参考。

本文基于一榀三层两跨方钢管混凝土框架拟静力试验，分析了低周反复水平荷载作用下框架的延性性能和强度与刚度的退化以及抗震耗能能力，及框架位移随反复荷载变化的滞回曲线，并根据顶层滞回曲线进一步得出了框架顶层骨架曲线及相应的恢复力模型。在试验基础上进行了理论研究，采用非线性有限元分析方法，将恢复力模型应用到混凝土弹性模量退化方程中，并对试验结果进行了计算模拟，结果证明，结合本文理论研究成果进行的计算模拟与试验结果比较符合。