Bearing and deformation behavior of structural elements of Infra-Lightweight Concrete under bending stress

轻质混凝土是一种高性能轻骨料混凝土，由于其干密度很低，具有很好的隔热性能。因此，可以建造承重和隔热的整体结构。虽然轻骨料混凝土结构构件的承载和变形性能是已知的，但关于轻骨料混凝土结构构件的承载和变形性能的研究成果很少，柏林工业大学的概念和结构设计系主任对轻骨料混凝土的研究是一个主要的研究领域。由于对生产进行了全面的调查，对混合物和处理进行了改进，现在可以获得合适的混合物。轻质混凝土已经用于一个家庭住宅的外墙结构和一个智能材料住宅的墙壁模型，该住宅于2012年被豪瑞基金会授予创新奖。目的是系统地研究在弯曲应力作用下，混凝土-轻骨料混凝土结构构件的承载和变形性能，并公布结果，为进一步的研究和结构设计。这包括极限状态的调查，裂缝的行为，以及张力硬化，直到崩溃。本项目将提供用于数值计算的本构方程，并使用弯矩-曲率关系和有限元计算进行验证。本项目的更大目标是在建立节能和可持续建筑方面向前迈进，并能够建造易于回收的整体结构。因此，将发展轻骨料混凝土受弯构件的结构设计原则。

Infra-Lightweight Concrete is a High Performance Lightweight Aggregate Concrete which has very good heat insulating properties because of its very low dry density. Thus it is possible to build load-bearing and heat insulating monolithical structures. Although the bearing and deformation behavior of structural elements of Lightweight Aggregate Concrete is already known there are barely any research results available on the behavior of structural elements of Infra-Lightweight Aggregate Concrete.At the chair of conceptual and structural design at TU Berlin research on Infra-Lightweight Concrete is a major research field. Because comprehensive investigation on production, improvements on mixtures and handling have been conducted, suitable mixtures are now available. Infra-Lightweight Concrete was already used in exterior wall structures for a single family house and a wall mock-up for a Smart Material House which was awarded with an innovation price by the Holcim Foundation in 2012. The aim is to systematically investigate the load bearing and deformation behavior of structural elements of Infra-Lightweight Aggregate Concrete under bending stress and to publish the results for further research and for structural design. This includes the investigation of the Ultimate Limit State, the crack behavior as well as the tension stiffening until collapse. Constitutive equations for numerical calculations will be provided and verified using moment-curvature-relations and finite element calculations.The greater aim of this project is to move forward in establishing energy-efficient and sustainable architecture and enable to build monolithic structures which can easily be recycled. Therefore, the principles for structural design of bending elements of Infra-Lightweight Concrete will be developed.