SEISMIC VULNERABILITY ASSESSMENT OF VAULTED MAYA CONCRETE TEMPLES IN BONAMPAK, CHIAPAS, MÉXICO Humfrey M. Kimanya, Anna M. Remus, Omar Hamad, Justin W. Sennyondo, Dung T. Nguyen, Selman Tezcan and Renato L. Perucchio Department of Mechanical Engineering, University of Rochester, Rochester, NY 14611, USA e-mail: hkimanya@u.rochester.edu, aremus2@u.rochester.edu, ohamad@u.rochester.edu, jsennyon@u.rochester.edu, dnguy23@u.rochester.edu, stezcan@ur.rochester.edu, rlp@me.rochester.edu Abstract Vaulted concrete structures at the Late Classic Maya complex of Bonampak, Chiapas, Mexico (circa AD. 580-800) house some of Mexico’s best-preserved Maya murals, but they are at risk due to significant seismic hazard in the region. Seismic vulnerability assessments of these structures via pushover analysis of 3D, nonlinear, finite element (FE) models provide insight into structural collapse mechanisms under unilateral acceleration. A sensitivity analysis of lateral capacity based on tensile strength of Maya concrete, foundation inclination, and the presence/absence of crestería (roof combs) is performed using Abaqus/CAE Explicit. The concrete damaged plasticity (CDP) formulation is implemented with parameters derived from experimental studies of Maya lime mortar and concrete from Maya historical sites near Bonampak. Structural collapse is detected from an analysis of the time-evolution of plastic dissipation, strain, and kinetic energies and basal reactions. The present work continues investigation of Structure 3 and adds analysis of Structure 1 under monotonically increasing lateral acceleration in the EW and NS direction. Both structures in their current states are found to be more vulnerable under loading in the NS than EW direction. The minimum obtained lateral capacities from applied NS acceleration of 0.55g for Structure 1 and 0.80g for Structure 3 imply that kinematic limit analyses using 2D rigid-body sectional models substantially overestimate seismic vulnerability due to (a) assuming zero tensile strength of Maya concrete and (b) ignoring the actual 3D architecture of the temples. Determining the extent to which intervention is necessary is one of the major challenges for preserving historical masonry structures. This research offers one example of how 3D nonlinear FE models may help avoid unnecessary interventions. Keywords: nonlinear finite element analysis, pushover analysis, concrete damaged plasticity, Maya concrete, lateral capacity, peak ground acceleration. 1644 COMPDYN 2023 9 th ECCOMAS Thematic Conference on Computational Methods in Structural Dynamics and Earthquake Engineering M. Papadrakakis, M. Fragiadakis (eds.) Athens, Greece, 12-14 June 2023 Available online at www.eccomasproceedia.org Eccomas Proceedia COMPDYN (2023) 1644-1659 ISSN:2623-3347 © 2023 The Authors. Published by Eccomas Proceedia. Peer-review under responsibility of the organizing committee of COMPDYN 2023. doi: 10.7712/120123.10508.20489