Analysis of the Acceleration Response Spectra of Single-Layer Spherical Reticulated Shell Structures

Feng Fan,Wenliang Li,Xudong Zhi

doi:10.3390/app12042116

Abstract

In recent years, earthquake disasters have seriously damaged nonstructural components, so it is necessary to study their seismic performance. However, the existing scholarly research mainly concentrates on multistorey and high-rise buildings, and there are still deficiencies in the analysis of the seismic performance of the nonstructural components in large-span structures under seismic action. In this paper, the acceleration responses of a single-layer spherical reticulated shell structure are compared with those described in the current seismic design codes of the nonstructural components, and it is found that the current codes are not fully applicable to the seismic design of the nonstructural components in reticulated shell structures. The calculation formulas of the acceleration response spectra of single-layer spherical shell nodes are theoretically derived, and the shell node acceleration response spectra are affected by higher-order modes, orthogonal horizontal seismic input directions, and the membrane stiffness of the shell nodes. The variations in the acceleration responses of the shell nodes with node position and rise-to-span ratio are analysed, and a design method for the equivalent seismic action of the nonstructural components in a single-layer spherical reticulated shell with a roofing system is proposed.

Highlights

The single-layer spherical reticulated shell structure is a typical large-span space structure that is widely used in public buildings and densely populated places, shoulders the important functions of acting as temporary command centres, and provides rescue and rescue safety barriers for people after disasters
The acceleration responses of single-layer reticulated shell nodes are compared with current codes
The analysis examines examples of the horizontal and vertical acceleration responses of the shell nodes in the D6053-W, D6053-LSWM, and D6053HHWM structures under three-dimensional ground motions

Summary

Introduction

The single-layer spherical reticulated shell structure is a typical large-span space structure that is widely used in public buildings and densely populated places, shoulders the important functions of acting as temporary command centres, and provides rescue and rescue safety barriers for people after disasters. Fan et al [1] studied the seismic response and seismic failure mechanism of reticulated shell structures and proposed the analysis methods for the seismic performance of different reticulated shell structures. Li et al [3] studied the dynamic elastic buckling of arch trusses under earthquake action and analysed the effects of different damping ratios and ground motions on the seismic failure modes of the structures. Deepshikha et al [6] analysed the effects of higher modes of multistorey substructures on the seismic response of double-layered reticulated shells and proposed the equivalent static loads analysis method to quantify the interaction between the shell and the higher multistorey substructure modes. Under the action of an earthquake, the seismic damage of the nonstructural components is usually more serious than that of the main structure [7]

Methods

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Discussion

Conclusion