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TECHNOLOGY AND ASSESSMENT QUESTIONS ON REINFORCED CONCRETE BEAMS BUILT AT THE BEGINNING OF THE 20TH CENTURY

机译:20世纪初建立的钢筋混凝土梁的技术和评估问题。

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In European cities there are many R.C. buildings and constructions belonging to the early 20th century and, in most cases, these pieces of work so rich in historical, architectural and cultural significance urgently require maintenance and rehabilitation. It appears particularly important to study in detail the historical examples, and to recognize those characters and technical details of the solutions in order to keep the trace of the history and preserve the memory of the architectural and structural 20th century buildings.Reinforced concrete works, from the origins until the release of the first national technical standards, were built by applying patented systems (i.e. the Monnier's or the Hennebique's system) that were often the result of individual intuitions more than the product of coherent and established scientific and technical knowledge. This is one of the reasons why many of structures built in those years, and still surviving, could not be considered reliable with regard to the structural safety, as it is presently intended.In this scenario, the evaluation of R.C. beam shear capacity becomes crucial. In this paper, starting from the tests carried out in Stuttgart in the early 20th century, an analysis of shear capacity evaluation is presented. The aim is to show that the relations given for 'new beams' in the present codes cannot be used, without any modification, for the verification of 'historical beams'.
机译:在欧洲城市中,有许多R.C.属于20世纪初期的建筑物,在大多数情况下,这些具有丰富的历史,建筑和文化意义的作品迫切需要维护和修复。似乎特别重要的是仔细研究历史实例,并认识到解决方案的这些特征和技术细节,以保持历史的痕迹并保留20世纪建筑结构的记忆。直到第一个国家技术标准发布之前,其起源都是通过应用专利系统(例如,Monnier或Hennebique系统)建立的,这些专利系统通常是个人直觉的结果,而不是连贯的和既定的科学技术知识的产物。这就是为什么在那些年中建造并仍在幸存的许多结构不能如目前所预期的那样被认为在结构安全性方面是可靠的。在这种情况下,对R.C.梁的剪切能力变得至关重要。本文从20世纪初在斯图加特进行的测试开始,对剪切力评估进行了分析。目的是表明在没有任何修改的情况下,不能将当前代码中针对“新光束”给出的关系用于“历史光束”的验证。

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