About this Research Topic
The vertical component of seismic acceleration, which is often overlooked in the international codes on earthquake engineering, can play an important role in seismic safety. This is not only in the case of bridges and viaducts, but also for ordinary structures, both in C.A. and in masonry.
It has been observed that in near-fault earthquakes, the vertical seismic accelerations may be comparable to the corresponding horizontal ones in terms of amplitude and frequency content. This implies that the vertical elastic response spectra are quite different compared to the ones defined in the codes.
Unfortunately, the international seismic codes tend to not consider the vertical seismic component, or refer to underestimated elastic response spectra and do not require seismic analyses for vertical seismic accelerations. This may be very dangerous considering that all the catastrophic earthquakes that happened in Italy in the last twenty years have to be defined as near-fault.
In all the world, the amount of scientific work around this topic is limited with respect to the importance of seismic structural safety. Hence, the fundamental goal of this Research Topic is to elaborate on this research area involving researchers that, in the last years, have been interested in the field of the structural analyses under vertical seismic excitation.
The objective is to bring together the results of studies in various areas into one destination around the importance of the vertical component of earthquakes on structural safety and seismic risk. A related objective is to raise awareness that these topics should not be neglected by the international seismic codes.
This Research Topic is highlighting the importance of considering the vertical component of the seismic acceleration for the safety of any structure. Especially when taking into account those structural typologies for which most international seismic codes do not require the analysis for vertical earthquake component. For this reason, the contributors should belong to various research areas such as structural engineering, geotechnical engineering, geology, seismology, and geophysics. In this framework, the manuscripts could include theoretical aspects and/or experimental and practical results.
This Topic is a multi-disciplinary project with a unitary fundamental subject: the vertical component of earthquakes. The Research Topic can include, but is not limited to, the following themes:
• Seismic provisions around the vertical components of seismic action including provisions related to buildings, bridges, nuclear power plants, dams, etc;
• Problems related to mass modeling when the vertical component of seismic action is considered;
• Studies on the probability of maximum simultaneous values of horizontal and vertical seismic accelerations;
• Representation of the vertical action in seismic codes;
• Effects of the vertical component on historical buildings and structures;
• Simplified methods of seismic structural analyses in the presence of the vertical component
• Studies on the correlation between the high vertical seismic component and near-fault or near-source earthquakes;
• Frequency content of the vertical seismic signal and its effect on structures;
• Case studies related to the behavior of structures subjected to high vertical seismic actions;
• Studies related to the geophysical properties of earthquakes with a high vertical component.
Keywords: Seismic vertical component, Near-fault earthquakes, Structural effects due to vertical accelerations, Codes on the seismic vertical component, Structural seismic analysis for three-component earthquakes
Important Note: All contributions to this Research Topic must be within the scope of the section and journal to which they are submitted, as defined in their mission statements. Frontiers reserves the right to guide an out-of-scope manuscript to a more suitable section or journal at any stage of peer review.