新型灾害冻震震害分析及形成机理

发布时间：2018-02-21 02:48

本文关键词： 防灾减灾工程冻震地震修正Mercalli烈度(MMI)　出处：《清华大学学报(自然科学版)》2017年10期 　论文类型：期刊论文

【摘要】：冻震是一类新型的自然灾害,其震感及震颤特征与一般构造型破坏性地震前兆现象相似,易造成人们的恐慌,也给工程设计人员带来担忧。目前国内外尚未提出相关数学模型描述冻震的形成机理、定量评估冻震震害水平,国内的相关报道甚至将冻震与冰震混淆。该文统计了已有的冻震记录,并基于能量假定估算了冻震可能达到的最大烈度及其地面峰值加速度(peak ground acceleration,PGA)。理论研究表明:冻震最大可能达到的修正Mercalli烈度(modified Mercalli intensity,MMI)为VI度,对应的地面峰值加速度低于典型构造型破坏性地震Elcentro-NS纪录的PGA的10%,冻震可能导致一般城镇钢筋混凝土建筑结构损伤开裂,但不会导致不可恢复性破坏。
[Abstract]:Frozen earthquake is a new type of natural disaster. Its tremor and tremor characteristics are similar to the precursor phenomena of general structural destructive earthquakes, which can easily cause people to panic. At present, some mathematical models have not been put forward to describe the formation mechanism of frozen earthquake, and the damage level of frozen earthquake has been quantitatively evaluated. Relevant reports in China have even confused frozen earthquakes with ice shocks. This paper has counted the existing records of frozen earthquakes. Based on the energy assumption, the maximum intensity and the peak ground acceleration of the frozen earthquake are estimated. The theoretical study shows that the maximum Mercalli intensity of the frozen earthquake can be modified Mercalli intensityMMI is VI. The corresponding peak acceleration of the ground is lower than that of the PGA recorded by typical structural destructive earthquakes (Elcentro-NS). The frozen earthquake may lead to damage and cracking of reinforced concrete structures in general towns, but it will not lead to irrecoverable damage.
【作者单位】：清华大学土木工程系土木工程安全与耐久重点实验室;珠海市城乡规划编审与信息中心;
【基金】：国家自然科学基金重点资助项目(51138007) 国家科技支撑计划资助项目(2011BAJ09B02)
【分类号】：P315.9

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