Dynamics of Simply Supported Beam Members Subject to Vertical Seismic Acceleratio
Session
Civil Engineering, Infrastructure and Environment
Description
Despite in most cases vertical seismic acceleration is disregarded in practical structural design, mainly due to the uncritical actions of the pertinent load combination, current standards prescribe the structural check of long-span and pre-stressed beam members subjected to vertical acceleration when they are located in high seismic hazard areas. Current design approaches focus on either finite element calculation, which does not provide a logical guidance to the designer for the problem, or, alternatively, on simplified calculations typically assuming lumped masses concentrated at midspan of the horizontal member. The latter approach does provide only an indicative solution affected by arbitrary modelling choices, which may bias the final design. This issue may become critical for precast pre-stressed concrete beams and roof elements, which are characterised by contemporary large slenderness, span, and mass. The present paper aims at describing a rigorous solution of the linear dynamics of such elements subject to vertical seismic acceleration in elastic field, accompanied by useful design recommendations based on parametric analysis.
Keywords:
vertical acceleration, earthquake response, linear dynamics, beam members.
Proceedings Editor
Edmond Hajrizi
ISBN
978-9951-550-95-6
Location
UBT Lipjan, Kosovo
Start Date
28-10-2023 8:00 AM
End Date
29-10-2023 6:00 PM
DOI
10.33107/ubt-ic.2023.358
Recommended Citation
Foti, Francesco; Capacci, Luca; and Lago, Bruno Dal, "Dynamics of Simply Supported Beam Members Subject to Vertical Seismic Acceleratio" (2023). UBT International Conference. 22.
https://knowledgecenter.ubt-uni.net/conference/IC/civil/22
Dynamics of Simply Supported Beam Members Subject to Vertical Seismic Acceleratio
UBT Lipjan, Kosovo
Despite in most cases vertical seismic acceleration is disregarded in practical structural design, mainly due to the uncritical actions of the pertinent load combination, current standards prescribe the structural check of long-span and pre-stressed beam members subjected to vertical acceleration when they are located in high seismic hazard areas. Current design approaches focus on either finite element calculation, which does not provide a logical guidance to the designer for the problem, or, alternatively, on simplified calculations typically assuming lumped masses concentrated at midspan of the horizontal member. The latter approach does provide only an indicative solution affected by arbitrary modelling choices, which may bias the final design. This issue may become critical for precast pre-stressed concrete beams and roof elements, which are characterised by contemporary large slenderness, span, and mass. The present paper aims at describing a rigorous solution of the linear dynamics of such elements subject to vertical seismic acceleration in elastic field, accompanied by useful design recommendations based on parametric analysis.