现有混凝土建筑和结构的强度可通过分析进行评估，必要时可通过荷载试验进行补充。本报告中的建议指出了何时可能需要进行此类评估，确定了选择评估方法的标准，并指出了评估所需的数据和背景信息。详细描述了在分析和载荷试验研究中使用的确定材料特性的方法。分析调查应遵循强度设计原则。工作应力分析可以通过将结构部件中的实际应力状态与观察到的条件相关联来补充分析研究。

The strength of existing concrete buildings and structures can be evaluated analytically and supplemented where necessary with load testing. The recommendations in this report indicate when such an evaluation may be needed, establish criteria for selecting the evaluation method, and indicate the data and background information necessary for an evaluation. Methods of determining material properties used in the analytical and load test investigations are described in detail. Analytical investigations should follow the principles of strength design. Working stress analysis can supplement the analytical investigations by relating the actual state of stress in structural components to the observed conditions.