Collapse mechanism of pilotis buildings and development of displacement distribution structural system

底层架空建筑倒塌机理及位移分布结构体系开发

基本信息

批准号：
15360304
负责人：
ZHANG Fuming
金额：
$ 7.81万
依托单位：
National Research Institute for Earth Science and Disaster Prevention
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15360304/
关键词：
Pilotis building Damage Collapse Pulse ground motion Structural control Vibration mode Seismic design

项目摘要

The object of this research is to investigate the collapse mechanism of pilotis buildings, and to develop a new structural system for preventing the collapse at the first story of buildings.In order to investigate the collapse of reinforced concrete pilotis building, a numerical integration method was developed using the correct instantaneous stiffness of elements by predicting the time increment compatible with stiffness variation. The collapse of reinforced concrete columns was discussed using fiber model at plastic hinge and considering the horizontal and vertical vibrations. It was found that column models will collapse at a smaller earthquake input level for a simultaneous input of vertical motion, the ultimate safety of buildings should be evaluated considering the 3-dimensional dynamic behaviors of vertical members. Recent near-fault earthquakes shown strong pulse-like ground motion component in velocity, explicit formulas and simplified methods are efficient to highlight the de … More structive power of ground motions. Here, earthquake motions are simplified as rectangular acceleration pulses and velocity pulses that are solely related with peak values of ground motions, and explicit formulas are obtained that give an extremely simple correlation between structural response and seismic demand with peak values of ground motion.In order to eliminate deformation concentration of building structures, Rocking Center Designated (RCD) Mechanism is proposed to control the vibration modes. Firstly, the dynamic characteristics of this new structure were investigated, and its seismic design method was proposed. The effectiveness and advantages were discussed for design of new buildings and for retrofitting of existing buildings. To confirm the vibration properties of this new structure, Small shaking table tests were carried out to confirm the function of RCD mechanism for displacement distribution. Test results shown that the vibration mode of the main structure varies according to the rocking center of RCD mechanism. If the rocking center is under the ground level, then the first vibration mode will be predominant, and will be solely decided by the rocking radius geometrically, and the story forces are effectively relocated by RCD mechanism. This new structure system is expected to meet different performance needs for distributing the first mode displacement, and to choose the most suitable structural member for strength, deformation and energy consumption. Less

这项研究的目的是研究试点建筑物的崩溃机制，并开发出一种新的结构系统，以防止建筑物的第一个故事中的崩溃。为了研究钢筋混凝土飞行员建筑的崩溃，使用正确的元素刚度刚度刚度刚性来通过预测时间递增的僵硬量相稳定的刚度变量来开发一种数值整合方法。使用塑料铰链上的纤维模型讨论了钢筋混凝土柱的崩溃，并考虑了水平和垂直振动。已经发现，对于简单的垂直运动输入，柱模型将在较小的地震输入水平下崩溃，考虑到垂直成员的3维动态行为，应评估建筑物的最终安全性。最近的近乎故障地震显示了速度，显式公式和简化方法的强脉冲状地面运动成分有效地突出地面运动的结构性功能。在这里，地震运动被简化为矩形加速度脉冲和速度脉冲仅与地面运动的峰值相关，并获得了明确的公式，并获得了结构响应和地震需求之间极为简单的相关性与地面运动的峰值之间的相关性与地面运动的峰值之间的峰值，以消除建筑物结构的振动型（振动型）的振动（RCD）。首先，研究了这种新结构的动态特征，并提出了其地震设计方法。讨论了针对新建筑物设计和现有建筑物改造的有效性和优势。为了确认这种新结构的振动特性，进行了小型摇台测试，以确认RCD机制的位移分布的功能。测试结果表明，主结构的振动模式因RCD机制的摇摆中心而有所不同。如果摇摆中心在地面下，则第一个振动模式将主要由摇摆半径的几何形式决定，而故事力则通过RCD机制有效地重新定位。预计这种新的结构系统将满足分发第一种模式位移的不同性能需求，并选择最合适的结构构件来实现强度，变形和能耗。较少的