Lightweight masonry basement walls under earth pressure

由于砌体的建筑物理特性，它特别适合建造地下室。然而，随着对墙体材料建筑物理性能要求的不断提高，砌体墙体的单位强度大多出现了较强的降低，导致砌体墙体的承载能力下降。地下室砌体的设计以旧的模型为基础，没有考虑到单元保温性能的提高。目前的设计在建模上不一致，特别是没有考虑墙与土之间的相互作用。现行的设计方法一方面比较保守，特别是在低压荷载的土压应力砌体墙的情况下，无法完成验证，但却完全给出了足够的承载能力。另一方面，工作空间被更早地填充，土壤被越来越重的压实设备压实，这在过去已经导致了几次破坏。这种研究方法所追求的目标特别考虑了墙与土之间的相互作用以及由此产生的土压力，这取决于与荷载相关的墙刚度、墙的几何形状和土壤压实方法。除此之外，它还考虑了非线性材料行为的力矩再分配能力。结合实验研究和分析/数值分析，应开发出物理上一致的模型。从而消除了目前砌体地下室墙体设计中存在的模型不确定性。

Masonry is particularly suitable for the execution of basements, due to its building physical properties. However, the increasing demands on the building physics of wall materials have caused a mostly strong reduction of the unit strength resulting in a lower load bearing capacity of masonry walls. The design of basement masonry is based on old models, that do not consider an improvement of the unit thermal insulation properties. The current design is inconsistent concerning the modelling and in particular does not take into account the interaction between wall and soil.The prevailing design methods are on one hand quite conservative so that especially in the case of earth pressure stressed masonry walls with low compressive load the verification cannot be fulfilled, however a sufficient load bearing capacity is completely given. On the other hand, work spaces are filled much earlier and the soil is compacted with increasingly heavy compaction equipment, which has led several times in the past to damages. The objective pursued by this research approach especially takes into account the interaction between wall and soil and the resulting earth pressure, which depends on the load-dependent wall stiffness, the wall geometry and the soil compacting method. Apart from this it considers the moment redistribution capacity of nonlinear material behaviour. With a combination of experimental studies and analytical/numerical analysis a physically consistent model shall be developed. The currently existing model uncertainties in the masonry basement wall design will be thereby eliminated.