Lightweight masonry basement walls under earth pressure

土压力下的轻质砌体地下室墙

• 批准号: 325176862
• 负责人: Dr.-Ing. Joachim Hannawald
• 金额: --
• 依托单位: Lehrstuhl für Baustoffkunde und Institut für Bauforschung (ibac)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/325176862?language=en
• 关键词: Lightweight; masonry; basement; walls; under

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.

由于其建筑物的物理特性，Massimo特别适用于地下室的施工。然而，对墙体材料的建筑物理学的日益增长的需求已经导致了单位强度的大部分强烈降低，从而导致砌体墙的承载能力降低。地下室砌体的设计是基于旧的模型，不考虑改善单位的隔热性能。目前的设计在建模方面不一致，特别是没有考虑墙与土之间的相互作用。一方面，现行的设计方法相当保守，因此，特别是在土压力应力砌体墙具有低压缩荷载的情况下，无法完成验证，但完全给出了足够的承载能力。另一方面，工作空间的填充要早得多，并且土壤是用越来越重的压实设备压实的，这在过去曾多次导致损坏。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重分布能力。结合实验研究和分析/数值分析，应开发物理上一致的模型。目前存在的模型不确定性的砌体地下室墙设计将因此而消除。