Abstract
Various structural types and ground motion characteristics lead to distinct intensity measures of structural seismic performance. For the lattice high-rise steel structure of communication towers, determining the intensity measures to adjust ground motion is critical. Additionally, a crucial problem is whether the ground motion intensity parameters of pulse-like ground motion and ordinary ground motion are consistent. In this study, a standard floor four-leg angle steeled communication tower was considered the study object, and 50 pulse-like ground motions and 50 ordinary ground motions were identified to form a pulse-like ground motion set and ordinary ground motion set, respectively. For comparative analyses, 15 ground motion parameters, including amplitude, spectrum, duration, and energy parameters, were selected. The results revealed that for the lattice towers, such as communication tower, under the action of pulse-like ground motion or ordinary ground motion, efficiency, practicability, and sufficiency should be considered. Furthermore, the most suitable intensity measure was the spectral acceleration corresponding to the natural period of the tower. This study provides a basis for selecting the ground motion for dynamic time history analysis of the lattice steel tower.
Highlights
With the continuous development of 5G communication technology and Internet, portable communication network services and applications, such as smartphone payment, online office and teaching, and webcast, have become an indispensable part of people’s daily lives
The results revealed that the ground motion parameters suitable for the study of structural seismic performance differed with the type of structures and ground motion characteristics
For lattice towers, including transmission towers and communication towers, currently, the seismic intensity measures identified by dynamic time history analysis or amplitude modulated ground motion predominantly involve peak acceleration (PGA) [6, 7], peak velocity (PGV) [8], spectral acceleration Sa(T1) corresponding to the natural period of the structure [9, 10] and the ratio of peak velocity to peak acceleration (V/A) [11]
Summary
With the continuous development of 5G communication technology and Internet, portable communication network services and applications, such as smartphone payment, online office and teaching, and webcast, have become an indispensable part of people’s daily lives. Earthquake and other earthquake damage investigations have revealed that in the event of an earthquake, damage to communication towers results in the suspension of communication with the outside world in some areas [4, 5] In such scenarios, rescue operations cannot be performed effectively, causing considerable casualties and loss of property. The use of appropriate intensity measures to select and adjust natural ground motion and the selection of appropriate engineering demand parameters (EDP) to evaluate structural damage are conducive to reducing the discrete type of structural dynamic time history analysis results and improving calculation efficiency. Considering the uncertainty of the input ground motion, the optimal intensity measures under pulse-like ground motion and ordinary earthquake action were selected from the perspectives of efficiency, practicability, and sufficiency. This study provides a basis of selecting ground motion for dynamic time history analysis of lattice steel tower
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