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Study on Dynamic Damaging Properties of Ground Motions to RC Structures by Shaking Table Tests

地震动对钢筋混凝土结构动力破坏特性的振动台试验研究

基本信息

批准号：
07458081
负责人：
SHIBATA Akenori
金额：
$ 4.74万
依托单位：
Tohoku Uniersity
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07458081/
关键词：
Reinforced Concrete Strong Ground Motions Shaking Table Damaging Properties Simulated Earthquake 強震動

项目摘要

Dynamic damaging properties of ground motions to structures must be evaluated by both peak value and cyclic effect during earthquakes. In this study, damaging properties of ground motions to RC structures are assessed by analytical study and shaking table tests of RC frame specimens under simulated input waves with different characteristics.In analytical study of observed ground motions, damaging characteristics are estimated based on concept of inergy response, such as total input energy or energy input process of ground motions. It is found that near field ground motions tend to bring very large input energy by initial 1 or 2 cycles, then such input energy causes large response of structures. And oceanic plate ground motions tend to bring input energy with relatively long duration time and causes cumulative damages.In shaking table tests, response behaviors of RC frame specimens during earthquakes with different damaging properties are investigated. Test specimens, that consist of 4 columns, rigid beams and top weight, are 1 story 1 span RC frame with moment yielding mechanism. In this experiment, input waves compensated with braced specimens that is already loaded, are used to avoid power reduction cased by interaction effects. By this method, input waves almost corresponding to expected ground motions are observed on the shaking table. And it is found that maximum response inertial force is about 10 percent larger than static restoring force, and that hysteresis loop by near field ground motions is relatively smaller than that of oceanic plate ground motions.

在地震过程中，地震动对结构的动力破坏特性必须通过峰值效应和循环效应来评估。本文通过分析研究和RC框架试件振动台试验，对不同特征的模拟输入波作用下的地震动对RC结构的破坏特性进行了评估。在对观测到的地震动进行分析研究时，基于能量响应的概念，如地震动的总输入能量或能量输入过程来估计损伤特性。研究发现，近场地震动在最初的1或2次循环中往往会带来非常大的输入能量，这种输入能量会引起结构的大响应。而大洋板块地震动往往带来持续时间较长的能量输入，造成累积损伤。在振动台试验中，研究了不同破坏性能的钢筋混凝土框架在地震作用下的反应特性。试件为具有弯矩屈服机构的1层1跨钢筋混凝土框架，由4根柱、刚性梁和顶自重组成。在本实验中，输入波补偿已加载的支撑试件，以避免相互作用造成的功率降低。通过这种方法，在振动台上观测到的输入波几乎与预期的地面运动相对应。最大响应惯性力比静态恢复力大10%左右，近场地震动产生的滞回线相对小于大洋板块地震动产生的滞回线。