关于既有建筑承载力鉴定标准的研究

Research on appraisal standard of bearing capacity of existing building

对既有建筑需要根据建筑物现状及后续运营情况重新确定后续目标使用年限作为时间的考量,这个目标使用年限是不确定的;同时现行设计规范与过往年代设计规范的可靠度水平也有很大变化。因此,考虑不同的目标使用年限,并采用统一的可靠度水平,对既有建筑的荷载作用、抗力及目标可靠指标给予时间因素影响的修正,才能对既有建筑给出更合理的鉴定结果。从研究各年代结构设计规范中荷载、抗力的变化入手,考虑既有建筑不同后续目标使用年限的需求,分析时间因素对荷载、抗力等相关参数的影响,探讨一种基于相同可靠度水平的、不同目标使用年限的既有建筑承载力鉴定标准。

For the existing buildings, the service life of the subsequent target should be redetermined according to the current situation of the building and the subsequent operation. The service life of the target is uncertain. At the same time, the reliability level of the current design code and the design code of the past has changed greatly. Therefore, only by considering different target service life and adopting a unified reliability level, the existing building’s load action, resistance and target reliability index can be modified with the influence of time factors, so as to give a more reasonable appraisal result for the existing building. Starting from the study of the changes of load and resistance in the structural design codes of different ages, considering the needs of different subsequent target service life of existing buildings, the influence of time factors on relevant parameters such as load and resistance was analyzed, and a bearing capacity appraisal standard was discussed based on the same reliability level and different target service lives of existing buildings.