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首页> 外文期刊>Bulletin of Earthquake Engineering >Seismic fragility of RC framed and wall-frame buildings designed to the EN-Eurocodes
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Seismic fragility of RC framed and wall-frame buildings designed to the EN-Eurocodes

机译：根据EN-Eurocodes设计的RC框架和墙框架建筑的地震易损性

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Fragility curves are constructed for a portfolio of prototype regular RC frame and wall-frame buildings designed and detailed to EC2 and EC8. The aim is to use EC8’s own seismic performance assessment methods and criteria for existing buildings to evaluate how EC8 achieves its performance goals for new RC buildings. The overall conclusion is that these goals are met in a very consistent and uniform way across all types of buildings considered and their geometric or design parameters, except for RC walls of Ductility Class Medium, which may fail early in shear despite their design against it according to EC8. In fact, these walls do not perform much better than those of braced systems designed to EC2 alone. Therefore, wall shear seems to be an aspect in EC8 worth looking at again. Another finding is that the slenderness limits and the lateral bracing requirements of EC2 for 2nd-order effects under factored gravity loads place severe restrictions on the size of columns and walls, which, although ignored in ordinary seismic design practice, materially impact the outcome of the design and, to a smaller extent, the seismic fragilities of the building’s members. Mixing in the same building columns with significantly different stiffness most often penalizes the more flexible ones and not the stiff, despite their smaller deformation capacities. Another finding is that the reduction in fragility from higher design peak ground accelerations is disproportionately low. Even buildings designed for gravity loads only, but in full accordance to EC2, possess substantial seismic resistance.
机译：易碎曲线是针对常规RC框架和墙框架建筑原型设计的，并针对EC2和EC8进行了详细设计。目的是使用EC8自身对现有建筑物的抗震性能评估方法和标准，以评估EC8如何实现新的RC建筑物的性能目标。总体结论是，在考虑的所有类型的建筑物及其几何或设计参数中，这些目标均以非常一致和一致的方式得以实现，但韧性等级中等的RC墙可能会在早期剪切时失败，尽管根据其设计到EC8。实际上，这些墙的性能并不比仅针对EC2设计的支撑系统好。因此，壁剪似乎是EC8中值得关注的一个方面。另一个发现是，在分解重力载荷下，对于二阶效应，EC2的细长极限和横向支撑要求对圆柱和壁的尺寸施加了严格的限制，尽管在普通的地震设计实践中忽略了这一点，但对桩的结果产生了实质性的影响。设计，以及在较小程度上，建筑物成员的地震脆弱性。尽管它们的变形能力较小，但在具有相同刚度明显不同的同一建筑柱中混合时，通常会惩罚较柔韧性的建筑物，而不是刚性。另一个发现是，较高的设计峰值地面加速度导致的脆性降低幅度不成比例。即使仅设计用于重力载荷但完全符合EC2的建筑物，也具有相当大的抗震性。

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