通过27根不同剪跨比的试件对钢骨高强混凝土短柱的位移延性进行了研究，分析了配箍率对钢骨高强混凝土短柱延性的影响，并得出了配箍率和延性间的关系曲线。增加配箍率可以提高短柱的延性，因此可以将轴压力系数限值适当放宽。本文根据试验结果，提出了满足一定延性要求的、对应于不同配箍率的钢骨高强混凝土短柱轴压力系数限值。

断裂力学基本上有两种分析裂缝稳定性的方法：应力强度因子法和能量法。在混凝土断裂性能的描述上两者应该是等效的。针对目前大多数混凝土断裂模型以应力强度因子型的断裂韧度作为判定准则，本文尝试从能量的角度出发，结合线弹性断裂力学和虚拟裂缝区上的黏聚力分布，以能量释放率G作为断裂性能判定参数，建立了混凝土结构裂缝扩展的双G准则。与双K断裂参数相对应，双G准则引入了两个重要的裂缝扩展判定参量：起裂断裂韧度GiniIc和失稳断裂韧度GunIc。其中，起裂断裂韧度Ginilc对应于起裂荷载Pini和初始裂缝长度a0；失稳断裂韧度GunIc对应于极值荷载Pmax和临界有效裂缝长度ac。根据线性渐进叠加假定，可以把（Pini，a0）和（Pmax，ac）代入线弹性断裂力学相对应的公式直接求得GiniIc 和GunIc。考虑到起裂荷载Pini的不易确定性，本文引入黏聚力分布引起的能量损耗GcIc，通过三者GiniIc 、GunIc和GcIc的关系，给出了起裂断裂韧度GiniIc和失稳断裂韧度GunIc的适用计算公式，并通过三点弯曲梁实验得到了验证。

Many attempts have been focused on the textile reinforced mortar structures. The advantages of textiles are mainly a very good load bearing capacity, excellent ductility, thin size and light weight of components, resistance to corrosion, and no magnetic disturbances. Such structures are expected to have wide application foregrounds. The transfer of forces from reinforcement to mortar is accomplished through a bond. Therefore, understanding and further improving bond properties of textiles in mortar are important. In the paper, bond characteristics of various textiles in mortar obtained from pull-out tests and numerical simulations are shown and compared. The textiles used include carbon, alkali resistant glass and aramid. They were plain and impregnated with epoxy resin. Prestressed and nonprestressed specimens were tested. The experimental results show that epoxy resin impregnating and prestressing can strongly enhance the bond strength. Numerical simulations show good agreement with the experimental results and significantly contribute to a better understanding of the bond characteristics of textiles in mortar.

In this paper a mode It fracture testing method has been developed for wood from analytical, experimental and numedcaI investigations. Analytical resufls obtained by other researchers showed that the specimen geometry and loading type used for the proposed mode Ⅱ testing method results in only mode Ⅱ stress intensity and no mode Ⅰ stress intensity at the crack tip Experiments have been carded out to determine mode II fracture toughness A'iic and fracture energy GIIF from the test data collected from both spruce (picea afiies) and popIar (popuIus nigra) specimens. It was found that there existed a very good relation between fracture toughness Kiic and fracture energy GIlF when the influence of orthotropic stiffness EI in mode Ⅱ was taken into account. It verified that for this mode Ⅱ testing method the formula of LEFM can be employed for calculating mode Ⅱ fracture toughness even for highly orthotropic materiaIs like wood In the numerical studies for the tested spruce specimen, the crack propagation process, stress and strain fields in front of crack tips and the stress distributions along the ligament have been investigated in detail. It can be seen that the simulated crack propagating process along the ligament is a typical s hear cracking pattem and the development of cracks along the ligament is due to shear stress concentrations at the crack tips of the specimen. It has been shown that this mode Ⅱ fracture testing method is suitable for measuring mode Ⅱ fracture toughness/(ElC for highly orthotropic materials like wood.

与其它增强混凝土结构相比，纤维织物增强泥凝土结构具有防腐、医疗器材的防磁化、重量轻、承载力强和高韧性等显著的优势。由于其广泛的应用背景，织物增强混凝土的发展。尤其是在弄清和提高织物与混凝土之间的粘接陛能方面引起了众多的羌注。本文通过拉拔和数值模拟得到了高性能精细混凝土与碳纤维织物之间粘接性能的试验结果，其中拉拔试验所采用的碳纤维编织物分别进行了无涂层、SBR（丁二苯乙烯）沫层以及环氧树脂浸渍处理。拒试验过程中。一部分织物没有预加应力，而其它织物则在混凝土完全浇筑成形之前施加了预应力。试验结果表明，氧树脂浸渍、SBR涂层以及预加应力可以太幅度提高粘接强度。基于混凝土微平面模型和一种新型的以应力滑移关系定义的粘接单元模型，本文对拉拔试验进行了非线性有限元数值模拟，结果与试验符合得很好。确利于深入了解纤维织物和混凝土之间的粘接性能。