Research on the Influence of Construction Disturbance on Vibration of Stone Cultural Relics
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摘要: 石造像类文物历时弥久,有极高的文化价值,但目前对于这类文物在施工扰动下的损伤特征、振动阈值等研究相对较少。依托于某博物馆改扩建工程,对现场多种机械施工扰动进行了振动测试,并对馆内石造像建立有限元模型,以实测施工扰动作为振动激励,进行逐步增量动力时程分析,研究石造像在施工扰动作用下的动力反应特征,并分析其损伤程度,判断易损部位。研究结果表明:石造像自振频率与施工扰动的高频特征相近,易受施工扰动影响;激励强度与石造像应变、最大拉应力、最大剪应力均为正相关关系,其中石造像足部、颈部所受激励影响远大于其余部位,为易损部位;将《爆破安全规程》中针对古建筑与古迹的安全允许质点振动速度1 mm/s作为强度上限对石造像进行时程分析,其应变、剪应力和拉应力虽均未超过岩石材质的力学性能,但仍有石造像常用修复材料水硬性石灰开裂的风险。Abstract: 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.
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Key words:
- construction disturbance /
- stone statues /
- vibration test /
- damage
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