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为正确评估震后地下防护结构的抗动载能力,对汶川地震地下防护结构的破坏状况进行了分析,根据结构震后破坏模式建立了相应的结构损伤力学模型,提出了震前固端拱在震后劣化为三铰拱的结构分析方法。针对不同结构型式,给出了动荷载动力系数的确定方法,通过计算得到了在相同均布荷载作用下地下拱形结构的弯矩和拱脚推力的计算公式。针对具体实例,计算了不同损伤型式的拱结构承受冲击波荷载时的结构内力,从而给出了震后结构的抗动载能力评估方法。研究表明,地下防护结构震后抗冲击能力下降可达50%以上。
In order to correctly evaluate the anti-dynamic carrying capacity of underground protective structures after earthquake, the damage status of underground protective structures in Wenchuan earthquake was analyzed. According to the failure mode of structures, a corresponding structural damage mechanics model was established. Structural analysis method of degenerating into three-hinged arch after earthquake. According to the different types of structures, the method of determining the dynamic load coefficient is given. The formulas for calculating the bending moment and the arch thrust of the underground arched structure under the same uniform load are obtained. According to the concrete example, the internal forces of structures with different types of damage are calculated under the shock wave loads, and the method of evaluating the anti-dynamic load capacity of the post-earthquake structures is given. The research shows that the shock resistance of the underground protective structure can drop by more than 50% after the earthquake.