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Shear Capacity for Unreinforced Masonry Wall, Evaluated with Different Methodologies, In Romania

机译：罗马尼亚，用不同方法评估的未增强砌体墙的剪力

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Seismic assessment of masonry buildings is important in high seismic risk areas such as Romania. This is because, unreinforced masonry shear walls subjected to in-plane seismic loading and eccentric compression, usually fail by diagonal cracking due to principal tensile stresses. The masonry sections of the Romanian Codes, generally conform to Eurocode 6 and Eurocode 8, but additional provisions regarding the calculation of shear strength capacity to resist lateral in-plane action from earthquake forces exist. For example, in the design of unreinforced masonry walls empirical coefficients are used to reduce the design shear strength capacity (V_Rd). With these provisions included, the number of storeys which can be designed in masonry buildings is significantly reduced and as a result it is may be necessary to sometimes alter the architectural layout in order to fulfil the strength requirements. An alternative design methodology [1], however, exists in Romania which, it is believed, more closely represents the real behaviour of masonry structures to seismic actions. Using this method the formulas for shear strength capacity (V_Rd) are evaluated taking into account the failure of the unreinforced masonry by diagonal cracking, in accordance with the Theory of Strength of Materials [20]; moreover, the methodology is based on numerous research studies and laboratory tests undertaken over 20 years. The method has been used by engineers to evaluate the performance of new and old masonry building structures. In the first part of this paper a short theoretical presentation of the methodologies is given followed in the second part by a case study in which three buildings with the same structural arrangement in plan but with different numbers of storeys (one, two and three) are analysed. The response of the whole structure to seismic action is evaluated using structural software [13]. In addition the shear strength capacities of the walls are calculated using software [2], and manually after the Romanian code. Finally, the shear strength capacities, calculated using the two methodologies are compared.
机译：在罗马尼亚等地震危险高的地区，对砖石建筑进行地震评估很重要。这是因为，未经加固的砌体剪力墙受到平面内地震荷载和偏心压缩，通常会由于主拉应力而因对角裂缝而失效。罗马尼亚法规的砌体部分通常符合欧洲法规6和欧洲法规8，但是还存在有关抗剪强度的计算的其他规定，以抵抗地震力引起的横向平面作用。例如，在无钢筋砌体墙的设计中，经验系数用于减小设计抗剪强度（V_Rd）。有了这些规定，可以在砖石建筑中设计的层数大大减少了，结果可能有必要有时改变建筑布局以满足强度要求。然而，罗马尼亚存在另一种设计方法[1]，据信，该方法更能代表砌体结构对地震作用的真实行为。使用这种方法，根据材料强度理论[20]，评估了抗剪强度承载力的公式（V_Rd），其中考虑了对角裂缝导致的未加固砌体的破坏。此外，该方法基于20多年来的大量研究和实验室测试。工程师已使用该方法评估新旧砖石建筑结构的性能。在本文的第一部分中，对方法进行了简短的理论介绍，在第二部分中，进行了案例研究，其中三个具有相同结构布置但层数不同（一，二和三）的建筑物分析。使用结构软件[13]评估了整个结构对地震作用的响应。另外，使用软件[2]计算墙壁的抗剪强度，并在罗马尼亚法规之后手动计算。最后，比较了使用两种方法计算出的抗剪强度。

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  • 来源
    《Masonry international》 |2013年第2期|33-39|共7页
  • 作者

    R.POPESCU; G.POPESCU; A.M.DINCA;

  • 作者单位

    Research & Design Diplomat Eng. Ist Degree, Technical Inspector in Designing A1, A3, E;

    Research & Design Diplomat Eng. Ist Degree, Technical Expert A, Inspector in Designing A1, A3;

    Design Diplomat Engineer, Master in building structure;

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