多环砌体拱的极限分析:关于摩擦角、几何形状、互锁和环数影响的参数研究

IF 2.2 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Frontiers in Built Environment Pub Date : 2023-11-30 DOI:10.3389/fbuil.2023.1309696
Bledian Nela, M. Pingaro, Patrizia Trovalusci, Monica Pasca
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引用次数: 0

摘要

大多数大跨度文物建筑都采用多环拱等弧形砌体构件,以获得更大的整体厚度。它们在承受外部荷载时的最终结构承载能力在很大程度上受到所采用的各种施工技术的影响。此类结构由独立的圆环组成,圆环之间通过界面接触相互沟通,几何特征(如尺寸、方向和单元排列)以及机械特征(如摩擦力)起着重要作用。在四分之一跨度上承受垂直荷载的多环拱利用内部代码进行评估,该代码采用了砌体结构极限分析的上限方法。我们给出了用于生成几何形状的脚本,并将其用于代码的输入。采用的离散模型考虑了砌块的尺寸和布置、摩擦角、环数和跨度长度。按照各自的影响参数对坍塌乘数的影响进行了分类,并根据单位尺寸将其分为两大类,从而证明了每个参数的重要性。结果表明,所有参数都是影响此类结构性能的关键因素。使用相对较大的单元会增强联锁的影响,并提供更大的坍塌乘数。在考虑跨度时,联锁的作用更大,而在改变环数时,联锁和摩擦的影响更大,因此更好的联锁和更大的摩擦值可提供更高的坍塌乘数。
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Limit analysis of multi-ring masonry arches: a parametric study on the effects of friction angle, geometry, interlocking, and ring number
The majority of built heritage covering large spans are built with curved masonry components, such as multi-ring arches, to attain greater overall thickness. Their ultimate structural capacity when subjected to external loads is significantly influenced by the various construction techniques utilized. Such structures are made up of independent rings that communicate with one another through interface contacts, and the geometrical features, like size, orientation, and the arrangement of units, play a significant role, as do the mechanical characteristics, like friction. Multi-ring arches subjected to a vertical load at quarter span are assessed utilizing an in-house code implementing the upper bound approach of the limit analysis for masonry structures. The formulation of a script for geometry generation has been given and used for the input to the code. A discrete model has been adopted accounting for a combination of size and disposition of blocks, friction angle, number of rings and the span length are taken into account. Following their combination of impacts in terms of collapse multipliers, which are classified as per respective influencing parameters, each one’s importance was demonstrated by classifying them into two major groups as per unit size. The outcomes showed that all the parameters were key influencing factors in the performance of such structures. Using relatively larger units enhanced the impact of interlocking and provided larger collapse multipliers. While interlocking played a more significant role when span was considered, it together with friction had a larger impact when ring number was varied, such that better interlocking and larger friction values provided higher collapse multipliers.
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来源期刊
Frontiers in Built Environment
Frontiers in Built Environment Social Sciences-Urban Studies
CiteScore
4.80
自引率
6.70%
发文量
266
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