Seismic performance and cost‐effectiveness of high‐rise buildings with increasing concrete strength

The effect of shear wall configurations on seismic responses of high-rise RC buildings is investigated in this paper using fragility analysis method. Four lower high-rise RC buildings that have the same plan dimensions and height but are different in configurations in lateral force resisting systems, were firstly designed following the standard code procedure. To consider uncertainties in earthquake motions, 16 real ground motion pairs were selected and scaled, then applied orthogonally to the four RC building models during the Incremental Dynamic Analysis (IDA). Fragility relationships were therefore derived based on the IDA results for the three limit states including slight damage, moderate damage and collapse to show the probabilistic comparison of seismic responses among the four buildings in both x and y-directions. It was observed that generally adding shear walls will improve buildings' seismic performance at all limit states. However, shear wall configuration also plays a significant role in seismic behavior of the lower high-rise regular RC buildings' and internal shear walls are generally more effective than external shear walls in improving building's seismic resistance.Erbil, Kurdistan Region, Iraq. His research interest is structural analysis and design of high-rise building.

Fragility assessment of high‐rise reinforced concrete buildings considering the effects of shear wall contributions

Shao

2016

Verification of performance criteria using shake table testing for the vulnerability assessment of reinforced concrete buildings

Mwafy

Almorad

2019

Shake table experiments are conducted to support the selection of performance criteria and to verify the inelastic modeling approach for developing the fragility functions of reinforced concrete buildings. Two frames representing the lateral force-resisting system of a preseismic code building are tested under the effect of an earthquake record with increasing severity. Shear failure is detected in columns at a PGA of 1.28g before other failure modes, which was effectively predicted by the fiber-based numerical model, performance criteria, and shear supply approaches adopted for vulnerability assessment. Five buildings, ranging from 2 to 40 stories, are then assessed under the effect of far-field and near-source earthquake records, considering the experimentally verified modeling approach and shear failure prediction models that account for flexural ductility and shear-axial force interaction. The impact of considering shear response on the vulnerability assessment results is considerable, particularly for the lower-height wall structures when subjected to the near-source earthquake scenario. Higher modes dominate the behavior of wall structures, principally under the latter seismic scenario, and shift their response to shear-controlled. Therefore, seismic scenario-structure-based performance criteria are adopted for developing a range of analytically derived, experimentally verified fragility functions for the earthquake loss estimation of buildings with different characteristics.

Component damage‐based seismic fragility analysis of high‐rise building with transfer structure

Liang

2022

Summary Fragility analysis is an effective tool used to assess the seismic risk of high‐rise buildings. During the process of fragility analysis, determining the engineering demand parameters (EDPs) corresponding to different damage states is of great importance as they directly influence the fragility results. However, for buildings with transfer structures, the EDPs corresponding to different damage levels are difficult to determine since the maximum demand in such buildings is mostly concentrated at the level of irregularity. Obtaining the fragility curves at component level (as used for bridge structures) may provide new insight into the seismic fragility analysis of buildings with transfer structures. Due to differences in structural systems and seismic response, it may be questionable whether such an approach can be directly applied to the fragility analysis of high‐rise buildings. In view of this, a component damage‐based approach suitable for high‐rise buildings and a detailed framework through which to obtain the fragility curves are proposed in this study. This method was applied to assess the seismic risk of a 34‐story concrete building with a transfer plate. The damage states for various structural components were obtained through a damage index (DI) model. The relationship between the DIs of the components and the maximum inter‐story drift ratios (MIDRs) was generated by cloud analysis, and MIDRs corresponding to different component damage states were obtained. The fragility curves at both component and system levels were evaluated. Numerical results indicate that, at the conservative level of PGA (0.2 g), the probability that the main components of the building incur irreparable damage is small, and the performance‐based seismic design requirements can be met.