Research on the Influence of Construction Disturbance on Vibration of Stone Cultural Relics

Stone statues have lasted for a long time and have high cultural value. However, there are few researches on damage characteristics and vibration threshold of such cultural relics under construction disturbance. Based on the reconstruction and expansion project of a museum, and the finite element model was established according to the 1:1 stone statues in the museum. A variety of on-site mechanical construction disturbances were used as vibration excitation to conduct on-site vibration testing, and the incremental dynamic time-history analysis was conducted to study the dynamic response characteristics of stone Buddha statues under different construction disturbances, the damage degree was analyzed, and the vulnerable parts in various ways were determined. The results showed that:the natural vibration frequency of stone statues was close to the high frequency characteristics of construction disturbance, which was easy to be affected by construction disturbance; the excitation intensity was positively correlated with the strain, the maximum tensile stress and the maximum shear stress of the stone statue; the foot and neck of the stone statue were vulnerable parts, which were affected by the excitation much more than the other parts; the permissible particle vibration velocity of 1 mm/s in Blasting Safety Regulations for ancient buildings and historic sites was taken as the upper limit of strength to analyze the time history of stone statues even though the strain, shear stress and tensile stress did not exceed the mechanical properties of the rock material, there was still a risk of cracking of hydraulic lime, a commonly used repair material for stone statues.