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On the dispersion of data collected by in situ diagnostic of the existing concrete

机译：关于通过对现有混凝土进行现场诊断收集的数据的分散性

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The compressive strength of in-place concrete is a crucial mechanical parameter which influences the performance level and the safety assessment of existing RC structures both under seismic loads and under dead loads. Italian NTC and Eurocode 8 [1.2] have established that the fundamental basis of the safety assessment is the "Knowledge Level (KL)", which shall be defined according to the procedures adopted for in situ inspection and materials testing (destructive and non-destructive). Within this framework - in the case of RC constructions - a major requirement is the explicit identification of the reference values for the strength of in situ concrete. The afore mentioned building codes, however, do not include any consideration about the uncertainty level affecting the results of in situ tests, which can indeed invalidate the reliability of the mechanical parameters. This problem is instead well addressed by FEMA 356 [3], which prescribes a limit value (14%) to the statistical dispersion of the measures performed on a set of concrete specimens. In this paper, after presenting and discussing a procedure applied for processing experimental data provided by in situ tests in a number of real case studies (school buildings in the Province of Foggia, Italy), the attention will be focused on the problem of the data scattering in the case of in situ concrete strength. It is shown that the variance is a crucial parameter, which should always be considered when performing the safety assessment, even if FEMA requirements, in this respect, are too much restrictive.
机译：现浇混凝土的抗压强度是一个关键的机械参数，它会影响现有RC结构在地震荷载和恒载下的性能水平和安全性评估。意大利NTC和欧洲规范8 [1.2]已确定安全评估的基本基础是“知识水平（KL）”，应根据就地检查和材料测试（破坏性和非破坏性）采用的程序进行定义）。在此框架内（对于RC建筑而言），主要要求是明确确定现浇混凝土强度的参考值。但是，上述建筑规范并未考虑到影响现场测试结果的不确定性水平，这实际上会使机械参数的可靠性无效。相反，FEMA 356 [3]很好地解决了这个问题，该方法规定了对一组混凝土试样所进行的测量的统计偏差的极限值（14％）。在本文中，在介绍并讨论了用于处理许多实际案例研究（意大利福贾省的教学楼）中的原位测试提供的实验数据的程序之后，注意力将集中在数据问题上在现场混凝土强度情况下发生散射。结果表明，方差是一个至关重要的参数，即使在这方面FEMA要求过于严格，在执行安全评估时也应始终考虑该参数。

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