修缮前后汉平阳府君阙燕尾榫地震力学响应分析  

Seismic response analysis of dovetail mortise-tenon joints in Pingyangfu Han-dynasty watchtower before and after repairing

作　　者：肖维民 刘伟超[1,2] 苏奇 朱占元 钟治 XIAO Weimin;LIU Weichao;SU Qi;ZHU Zhanyuan;ZHONG Zhi(School of Civil Engineening,Sichuan Agricultural University,Duyjiangyan 611830,China;Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction,Sichuan Agricultural University,Dujangyan 611830,China;Suining Natural Resouces and Planning Bureau,Suini ng 629000,China;Mianyang Museum,Mianyang 621000,China)

机构地区：[1]四川农业大学土木工程学院,四川都江堰611830 [2]四川农业大学村镇建设防灾减灾四川省高等学校工程研究中心,四川都江堰611830 [3]遂宁市自然资源和规划局,四川遂宁629000 [4]绵阳博物馆,四川绵阳621000

出　　处：《地震工程与工程振动》2020年第4期53-61,共9页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(41502242)。

摘　　要：汉平阳府君阙是由石块堆叠而成的松散高耸结构,在竖直方向上下石块间无连接,在水平方向同一层相邻石块间采用燕尾榫连接。1989年对阙体进行修缮时采用抗压强度较高的铁质燕尾榫,在水平地震荷载作用下燕尾槽附近岩石中的应力超过其极限值而产生开裂甚至挤碎,从而导致燕尾榫失效,为避免此类情况再次出现,此次修缮汉平阳府君阙时用木质燕尾榫替代铁质燕尾榫。为了分析修缮前后汉平阳府君阙燕尾榫的地震力学响应,采用有限元方法建立阙体结构数值计算模型,在对燕尾榫与石块间连接型式进行分类的基础上,根据有限元计算结果将燕尾榫与石块间的相互作用归纳为挤压作用、剪切作用以及剪切-挤压复合型作用三类;然后针对现场调研观测到的阙体结构典型破损情况,分析了3个典型燕尾榫-槽节点的破损力学机理。结果表明:与铁质燕尾榫相比,采用木质燕尾榫时阙体结构中各应力分量都明显减小,减幅在29.8%~75.2%之间,证实木质燕尾榫可以改善燕尾榫以及周围岩石的受力情况,并且对减小阙体结构榫-槽节点的应力值可以起到积极地作用。研究成果为石质文物结构的抗震找到了合理的方法,为石质古建筑的加固修缮提供了科学的参考依据。Pingyangfu Han-dynasty watchtower was a type of loose and high-rise ancient architectural structure piled up by rock blocks,in which no connections existed between the upper and lower layers of rock blocks,while dovetail tetons were used to connect the adjacent rock blocks in horizontal direction.In 1989,when the watchtower was repaired,the iron dovetail with high compressive strength was used.Under the horizontal seismic load,the stress in the rock near the iron dovetail exceeded the limit value and cracked or even crushed,resulting in the failure of the dovetail.In order to prevent such a situation,the iron dovetail was replaced by a wooden dovetail when repairing the Pingyangfu Han-dynasty watchtower.In order to analyze the seismic mechanical response of the Pingyangfu Han-dynasty watchtower before and after the restoration,the finite element method was adopted to build numerical models.Based on the classifications of connection types between dovetail tenon and rock blocks,according to the results of finite element analysis,the interactions between dovetail tenon and rock blocks were classified to extrusion,shear and combined shear-extrusion effects.Then the damage mechanisms of three typical dovetail teton-groove joints,where rock block damages were observed in field investigation,were analyzed based on numerical simulation results.The results show that compared with the iron dovetail,the stress components in the structure is significantly reduced when using the wooden dovetail,which is between 29.8%and 75.2%.It is confirmed that the wood dovetail can improve the mechanism between dovetail and surrounding rocks.The stress condition can be positively affected by reducing the stress value among dovetail and notch.The research results have found a reasonable method for the earthquake resistance of stone cultural relics,and provided a scientific reference for the reinforcement and repair of stone ancient buildings.

关 键 词：汉平阳府君阙 铁质燕尾榫 木质燕尾榫 地震响应 破损机理 

分 类 号：TU4[建筑科学—土工工程]