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Study on the Dynamic Forces (Dynamic Earthpressures and Displacement) acted on Urban Underground Structures during Strong Earthquake (c-2)

强震时城市地下结构所受的动力（动土压力和位移）研究（c-2）

基本信息

批准号：
08650580
负责人：
IWATATE Takahiro
金额：
$ 1.41万
依托单位：
TOKYO METROPOLITAN UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

项目摘要

(1) A detailed reconnaissance survey was conducted at the underground structures such as subways, mountain tunnels, multipurpose underground ducts and other underground structures, etc. around the Hanshin District caused by the 1995 Hyogoken-nanbu Earthquake.Among them, Daikai subway stations is the first subway structure that completely collapsed due to the earthquake. Judging from the damage pattern, a strong dynamic horizontal forces (earthpressures and shearing force) were applied to the structure from the surroundig subsoils.The center columns collapse due to a combination of bending and shear resulting in the shear deformation of the structure.(2) Scaled model (1/30 model) shaking table tests have been performed to clarify the dynamic behaviors and the damage mechanism of the Daikai subway station due to strong earthquake motions.From the test results, the subway structure was subjected to a strong horizontal forces (shear earthpressure and lateral earthpressures) from the adjacent subsoil, which caused the shear deformation of the structure. the shear earthpressure acted on the ceiling slab has a strong effect on the shear deformation of the structure but the lateral earthpressure acted on the side walls of the structure against the shear deformation of the structure, while in case of base acceleration 400 gal, the shear earthpressure acted on the ceiling slab also has a strong effect on the shear deformation of the structure and the lateral pressures acted on the side lateral walls of structure accelate the shear deformation of the structure.The bending strain of the center column is different of the contact condition between center column and floors. In case of fixed condition, it is about five times larger, but in case of hinge condition, it is 0.8-0.9 times smaller than those of the side wall.(3) These results verified through the analytical approach using SHAKE and TDAP programs.

(1)对1995年兵库县南部大地震中坂神地区周边的地下铁道、山岭隧道、多用途地下管道等地下构筑物进行了详细的勘察，其中大海地铁站是第一个在地震中完全倒塌的地铁构筑物。从破坏形态来看，该结构受到来自开挖地基的强烈水平动力（土压力和剪切力）作用，中心柱在弯剪共同作用下倒塌，导致结构剪切变形。(2)通过1/30缩尺模型振动台试验，研究了地铁大开站在强震作用下的动力特性和破坏机理，试验结果表明，地铁大开站结构受到邻近地基土的强烈水平力（剪切土压力和侧向土压力）作用，引起结构的剪切变形。作用在天花板上的剪切土压力对结构的剪切变形有很大的影响，但是作用在结构侧壁上的侧向土压力抵抗结构的剪切变形，而在基底加速度400 gal的情况下，作用在顶板上的剪切土压力对结构的剪切变形和侧压力也有很大的影响结构的侧墙加速了结构的剪切变形，中柱的弯曲应变随中柱与楼板的接触条件不同而不同。在固定条件下，它大约是5倍大，但在铰链条件下，它是0.8-0.9倍小的侧壁。(3)这些结果通过使用SHAKE和TDAP程序的分析方法进行了验证。