To　investigate　the　effects　of　venting　areas　on　the　structural　response　of　the　vessel　walls　to　an　explosion,　a　series　of　vented　explosion　experiments　of　a　10%　methane-air　mixture　were　carried　out　in　a　1　m3　rectangular　vessel　with　different　venting　areas.　The　adjustable　area　explosion　vent　was　on　the　top　of　the　rectangular　container,　and　a　piece　of　aluminum　membrane　bolted　with　a　flange　was　used　as　a　vent　cover.　The　vibration　acceleration　rates　and　internal　overpressures　were　recorded　by　an　acceleration　sensor　and　a　pressure　sensor,　respectively,　the　flame　propagation　images　were　captured　by　a　high-speed　camera　during　deflagration　and　the　frequency-time　distributions　of　signals　were　obtained　by　using　the　short-time　fast　Fourier　transform.　The　following　conclusions　could　be　obtained　by　analyzing　acceleration　rates,　internal　overpressures,　flame　propagation　images　and　frequency-time　distributions　of　signals.　(1)　The　change　trends　of　vibration　acceleration　and　internal　overpressure　are　similar,　and　both　have　obvious　double　peaks,　but　the　vibration　acceleration　peak　appears　slightly　later　than　the　overpressure.　As　the　dimensionless　coefficient　increases,　the　first　peak　of　internal　overpressure　and　vibration　acceleration　increases,　and　the　second　peak　first　decreases,　then　increases,　and　finally　decreases.　(2)　Two　types　of　structural　response　with　different　amplitudes　and　frequency　distributions　were　observed.　The　low-amplitude　vibrations　are　triggered　by　the　combined　effects　of　flame　initial　propagation,　Helmholtz-type　oscillations,　and　Taylor　instability,　while　the　high-amplitude　vibrations　are　triggered　by　the　coupling　of　sound　waves　and　flames.　(3)　Before　the　flames　are　ejected　from　the　vent,　the　average　velocities　of　the　upper　flames　decrease　with　the　increase　of　the　dimensionless　coefficient　and　the　flames　are　ejected　from　the　vent　earlier　when　the　dimensionless　coefficient　is　smaller.　(4)　Under　the　current　experimental　conditions,　the　thermoacoustic　coupling　phenomenon　is　the　most　violent　when　the　dimensionless　coefficient　is　25.00,　as　characterized　by　the　maximum　amplitude　vibration　response　and　maximum　energy　high-frequency　oscillation.　As　the　dimensionless　coefficient　further　increases　or　decreases,　the　thermoacoustic　coupling　phenomenon　gradually　attenuates.　©　2022,　Editorial　Staff　of　EXPLOSION　AND　SHOCK　WAVES.　All　right　reserved.