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宋維舉 ，劉   超 ，軒方方

 

（ 河北工程大學 土木工程學院 ，河北 邯鄲 056038)

摘   要 ：隨著第五代 GB 18306—2015 《中國地震動參數區劃圖》 中極罕遇地震概念的提出，有必要探討在極罕遇地震作用下單跨框架結構的倒塌破壞機理。利用顯式動力分析軟件 ANSYS/LS- DYNA 對單跨框架結構在極罕遇地震作用下的倒塌過程進行模擬，通過合理選取參數和模型，再現單跨框架結構倒塌破壞的全過程，揭示極罕遇地震作用下單跨框架結構的倒塌破壞機理，為既有單跨框架結構的鑒定與加固提供理論依據。結果顯示：在極罕遇地震作用下與多跨結構相比單跨框架結構抗震防線單薄，結構冗余度不足，且結構底層柱端出現 塑性鉸是引起單跨結構倒塌的主要原因。

關鍵詞：單跨框架結構 ；極罕遇地震 ；倒塌過程 ；仿真分析

中圖分類號：TU312. 3            

文獻標志碼：A           

文章編號： 1005- 8249   (2024)  04- 0106- 05 

DOI:10. 19860/j.cnki.issn1005 - 8249.2024.04.019

 

SONG Weiju ,  LIU Chao ,  XUAN Fangfang

(College of Civil Engineering ,  Hebei University of Engineering ,  Handan 056038 ,  China)

Abstract : With the concept of extremely rare earthquake proposed in the fifth generation of Seismic Ground Motion Parameter Zonation Map of China (GB18306-2015), it is necessary to explore the collapse mechanism of single-span frame structures under extremely rare earthquake. Using the explicit dynamic analysis software ANSYS/LS-DYNA, the collapse process of the single span frame structure under the action of rare earthquakes is simulated. Through reasonable selection of parameters and models, the whole process of collapse and failure of the single span frame structure is reproduced. The collapse and failure mechanism of single-span frame structures under extremely rare earthquake is revealed, which provides a theoretical basis for the identification and strengthening of existing single-span frame structures.The results show that the main reason for the collapse of the single-span frame structure is that the anti-seismic defense line of the single-span frame structure is thinner than that of the multi-span structure, the structure redundancy is insufficient, and the plastic hinge at the bottom column end of the structure is the plastic hinge.

Keywords: single-span frame structure;  extremely rare earthquake; collapse process; the simulation analysis

作者簡介：宋維舉  (1986—) ,   男 ，博士 ，講師，研究方向： 超限結構防災減災。

通信作者：劉   超  (1995—) ,  男 ，碩士研究生，研究方向：結構抗震。

收稿日期：2022- 07- 04