Plank trusses as material-saving timber structures in high modernism

木材工程是在高度现代主义时期发展起来的一门工程学科。因此，先决条件是对材料和连接的机械性能有基本的了解，一方面是基于科学研究，另一方面是基于创新理念的木基材料和高性能连接的发展。不知何故，在相对较好的胶合层技术的阴影下，通过使用钉子和螺栓将单个木板连接到木板桁架梁上的技术。这些结构元素主要体现在工字梁和桁架梁中，它们在19世纪末以钢结构而闻名。到目前为止，还没有对这种类型的建筑进行系统的研究和记录。此外，还可以检测到，用于计算剪切加载紧固件的最先进的工程方法并不总是正确地描述载荷-位移行为。这导致在工程方面缺乏知识，如果不同类型的板桁架梁应该检查效率和结构质量。这两点都在拟议的研究项目中得到了解决。一个跨学科小组将研究方法和标准，对一种进行登记和分类，对另一种进行识别、评估和评估。在这方面，已经确定了12个工作包，并将其分为两组。在第一步，将首先制定结构系统化的a类，然后用于确定大约四个参考项目。这些分类是基于对节材建筑的综合研究、历史研究报告、施工实践和技术规范。在第二步中，根据文化遗产对建筑价值进行评级的B类将被开发并应用于参考对象。所有相关的结果都应该成为评估和评价高现代主义时期历史建筑的更一般指导方针的一部分。这项研究项目应由两位科学家合作进行，一位是文化遗产方面的专家，另一位是结构工程方面的专家。所有的工作包都在项目中紧密地联系在一起。除此之外，它的目标是在SPP内部进行更广泛的合作。特别感兴趣的主题是“工程师竞赛”、“数字建模”、“知识、技术和过程的保护”以及“基于航空摄影的检测”。来自四个不同州的历史古迹办公室表示对“木板桁架梁”主题感兴趣，并确认了他们的支持。

Timber Engineering has been developed during the High modernism period as a specified discipline in engineering. The pre-requirements therefor were a fundamental understanding of the mechanical behaviour of the material and of the connections based on scientific re-search on one side and the development of wood-based materials and high-performance connections based on innovative ideas on the other side. Somehow in the shadow of the relatively well studied Glulam technology stands the technology of connecting single planks by use of nails and bolts into plank truss girders. These structural elements found their ex-ample mainly in the I-beams and trussed girders which had been well known in the end of the 19th century from steel structures. Until now construction history has not been studied and documented systematically for this type of construction. Furthermore it could be detected that the state-of-the-art in terms of engineering methods fot the calculation of shear loaded fasteners does not always describe the load-displacement behaviour correctly. This leads to a lack o knowledge on the engineering side, if different types of plank truss girders should be checked for efficiency and structural quality. Both points are addressed by the proposed research project. An interdisciplinary team will work on methods and criteria to register and classify on one and to recognise, evaluate and asses on the other. In this context 12 work-packages had been defined and arranged into two groups. In a first step A categories for systematization of structures will first be developed and than applied to identify about four reference projects. The categories are based on a comprehensive study regarding material-saving construction, historical research reports, construction practice and technical codes. In a second step B categories for rating the values of structures in terms of cultural heritage will be developed and applied to the reference objects. All relevant results should become part of a more general guideline about assessment and evaluation of historical structures which can be assigned to the period of High modernism.The research project should be carried out in cooperation by two scientists one educated in cultural heritage the other in structural engineering. All working packages are closely linked together within the project. Beyond that it is aimed for a wider cooperation within the SPP. Topics which are of special interest are "Competition of Engineers", "Digital Modelling", "Pro-tection of knowledge, technology an process" as well as "Detection based on aerial photography". State offices for historical monuments from four different states stated interest in the topic "plank truss girders" and confirmed their support.