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首页> 外文期刊>Bulletin of earthquake engineering >Assessment of expected damage on buildings subjected to Lorca earthquake through an energy-based seismic index method and nonlinear dynamic response analyses
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Assessment of expected damage on buildings subjected to Lorca earthquake through an energy-based seismic index method and nonlinear dynamic response analyses

机译：通过基于能量的地震指数方法和非线性动力响应分析评估洛尔卡地震对建筑物的预期破坏

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摘要

The city of Lorca (Spain) was hit on May 11th, 2011, by two consecutive earthquakes ofmagnitudes 4.6 and 5.2M_w, causing casualties and important damage in buildings. Many of the damaged structureswere reinforced concrete frames with wide beams. This study quantifies the expected level of damage on this structural type in the case of the Lorca earthquake by means of a seismic index I_v that compares the energy input by the earthquake with the energy absorption/dissipation capacity of the structure. The prototype frames investigated represent structures designed in two time periods (1994-2002 and 2003-2008), in which the applicable codeswere different. The influence of themasonry infillwalls and the proneness of the frames to concentrate damage in a given story were further investigated through nonlinear dynamic response analyses. It is found that (1) the seismic index method predicts levels of damage that range from moderate/severe to complete collapse; this prediction is consistent with the observed damage; (2) the presence of masonry infill walls makes the structure very prone to damage concentration and reduces the overall seismic capacity of the building; and (3) a proper hierarchy of strength between beams and columns that guarantees the formation of a strong column-weak beam mechanism (as prescribed by seismic codes), as well as the adoption of counter-measures to avoid the negative interaction between non-structural infill walls and the main frame, would have reduced the level of damage from I_v =1 (collapse) to about I_v =0.5 (moderate/severe damage).
机译：2011年5月11日，西班牙洛尔卡市遭受了两次连续的4.6级和5.2M_w级地震，造成人员伤亡和建筑物严重损坏。许多损坏的结构是带有宽梁的钢筋混凝土框架。这项研究通过地震指数I_v量化了在洛尔卡地震中这种结构类型的预期破坏程度，该指数将地震输入的能量与结构的能量吸收/消散能力进行了比较。研究的原型框架代表在两个时间段（1994-2002年和2003-2008年）中设计的结构，其中适用的代码不同。通过非线性动力响应分析，进一步研究了砌体填充墙的影响以及框架在给定楼层中集中破坏的倾向。发现：（1）地震指标法预测的破坏程度从中度/重度到完全坍塌;该预测与观察到的损害一致; （2）砌体填充墙的存在使结构很容易受到破坏，并降低了建筑物的整体抗震能力; （3）梁与柱之间的强度等级适当，可确保形成坚固的柱弱梁机制（如地震法规所规定），并采取对策以避免非柱之间的负面相互作用。结构填充墙和主体框架的破坏程度将从I_v = 1（崩溃）降低到大约I_v = 0.5（中度/严重破坏）。

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