中文摘要：

利用红外热像仪对含圆形预制孔洞的混凝土试件单轴、双轴加载变形破坏过程进行了监测，得到了试件破坏过程的红外热像。从红外热像中可以清楚地看到试件破坏过程中侧面的温度变化情况。另外，应用RFPA程序对试件在载荷作用下裂纹形成、扩展过程进行了数值试验。试件应力状态分析及数值试验结果表明，在载荷作用下，试件孔洞边缘出现应力集中现象，在拉应力集中区首先出现微裂纹，并且随着继续加载，微裂纹逐渐扩展、连通、搭接而形成宏观裂纹，最终导致试件破坏。由红外试验结果与数值试验结果对比可以看到，试件的微裂纹萌生、扩展区与红外热像中的升温区是相对应的。试件在破坏过程中整体上表现为升温，但微裂纹越集中的区域升温越明显。试验过程中还发现，试件的升温速率与加载速率呈正相关趋势。这一试验结果可为利用红外技术对混凝土构件破坏的预测预报提供理论基础。

英文摘要：

The thermal infrared imager is used for testing the deformation and failure process of hole-preforming concrete specimens, and thermal infrared images which indicate temperature field changes of testing surface of specimen are obtained. Furthermore, the numerical test is conducted by using a rock failure process analysis computer program （RFPA） to simulate specimen＇s cracks expansion process as load applying. The results of numerical test and specimen＇s stress condition analysis approve that as loads applying, in some regions of specimen where close to preforming hole, the stress concentration will take place. In those tension stress concentration regions, microcracks will generate, expand and connect to form macroscpic cracks gradually, which cause the specimen failure ultimately. From thermal infrared images, the temperature of testing surface rises generally. Moreover, it is found that the rate of temperature rising is in some positive correlations with the loading speed. Comparing results of thermal infrared test and numerical test, it reveals that regions where tension stress concentrates and microcracks generates in numerical test are corresponding to regions where temperature rises rapidly. It is a powerful proof to confirm that the generation and expansion of microcracks is one of major reasons to cause the temperature change of specimen during the failure process. This result could be regarded as the failure omen information of similar concrete structure, and could be used for forecasting the failure of concrete or rock structures.