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Pushover Analysis of Partially Strengthened Column Structures on an Existing Multi-story Building

机译：既有多层建筑中部分加固柱结构的Pushover分析

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A pushover analysis was conducted to evaluate structuralperformance of an extended building structure subjected to simulatedseismic loads. The Inna Garuda Hotel was selected as a building object ofthis research focusing on the extension building only. This 7-storyreinforced concrete building has been functioned as a hotel building in theYogyakarta City of Indonesia for over 30 years. Preliminary results of thisanalysis indicated that the performance level of this building wascategorized as an immediate occupancy (IO), however, the plastic hingeson the slim column structure components occurred. Given this condition, the structure of the building does not fulfill the concept of a strong columnweakbeam (SCWB). The research objective is to follow up on thepotential of building collapse due to the column structure weakness byconducting a research on the strengthening of slim column elements. Apushover analysis was carried out using ETABS software. A strengtheningtechnique was adopted by enlarging the dimensions of the slim columngradually. In this study, the slim column was enlarged up to 300/650 mm(KJ-P5 model). The pushover analysis results of the KJ-P5 model haveshown the drift ratio is less than 1.0% for the four directions of thepushover with the level of immediate occupancy performance (IO). Referring to the recent building condition, the strengthened slim columnsdo not seem significant damage to the structural components of thebuilding resulting in a fulfilling of SCWB concept, where a similarcondition on their strength and stiffness as before the earthquake occurs. The results of the plastic hinge locations, as well as the performance levelsof the indicated slim columns in resisting overall structures, are extensivelydiscussed in this paper.
机译：进行了推覆分析，以评估承受模拟地震荷载的扩展建筑结构的结构性能。 Inna Garuda Hotel被选为该研究的建筑对象，仅侧重于扩展建筑。这栋7层的钢筋混凝土建筑在印度尼西亚的日惹市用作酒店建筑已有30多年的历史了。该分析的初步结果表明，该建筑物的性能水平归类为即时占用（IO），但是，出现了细柱结构部件的塑料铰链。在这种情况下，建筑物的结构无法满足坚固的柱弱光束（SCWB）的概念。该研究的目的是通过对细长柱构件的加固进行研究，以跟踪由于柱结构薄弱而导致建筑物倒塌的可能性。使用ETABS软件进行Apushover分析。通过逐步扩大细长柱的尺寸，采用了一种加固技术。在这项研究中，细长柱扩大到300/650 mm（KJ-P5型）。 KJ-P5模型的推覆分析结果表明，随即刻占用性能（IO）的水平，推覆四个方向的漂移率均小于1.0％。参照最近的建筑状况，加固的细长柱似乎不会对建筑物的结构部件造成重大损害，从而无法实现SCWB概念，SCWB概念的强度和刚度条件与地震发生前相似。本文广泛讨论了塑料铰链位置的结果以及指示的细长柱在抵抗整体结构方面的性能水平。

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