Earthquake-response constrained design methods of building structure-pile-soil systems via hybrid inverse formulation

在这个项目中，开发了几种设计方法来寻找建筑框架-桩-土体系的地震反应约束设计。该系统由一个建筑框架和一个由分布式相互作用弹簧连接的桩-土系统组成的有限元模型来定义。设计地震被定义在桩的底部。主要结果如下：1。提出了一种新的理论，用于确定建筑物框架的基本自然周期和最低模态应变比的构件刚度。然后设计了一种有效的地震应变约束设计方法，用于固定基础的建筑框架。提出了固定基础建筑框架在设计中震和设计强震作用下的响应约束相等或不相等的双重抗震设计方法。3 .建立了一种直接的框架-桩-土体系刚度设计方法，用于确定其构件刚度，使框架在桩底确定的设计中地震集合下表现出平均峰值构件-端应变的指定分布。本文提出了一种有效的方法来求解具有指定高刚度基底的同轴共偏心剪力建筑的地震漂移约束设计问题，即以基底刚度柔度参数为基础的地震反应约束设计的泰勒级数表示。本文提出了一种计算方法，根据指定设计应变水平的参数，生成垂直激励双层网格地震反应应变约束设计的有序集。

In this project, several design methods have been developed for finding earthquake- response constrained designs of building frame-pile-soil systems. The system has been defined by the use of a finite element model consisting of a building frame and a pile-soil system both of which are connected by distributed interaction springs. The design earthquakes have been defined at the bottom level of the pile. The principal results are as follows.1. A new theory has been developed of finding member stiffnesses of a building frame for specified fundamental natural period and lowest-mode strain ratios. An efficient method of earthquake-strain constrained design has then been devised for a building frame with a fixed base.2. A dual seismic-resistant design method has been developed for a building frame with a fixed base such that the response constraints under the design moderate earthquakes and those under the design major earthquakes are satisfied as equality or inequality.3. A direct method of stiffness design of a building frame-pile-soil system has been developed for finding its member stiffnesses such that the frame would exhibit a specified distribution of mean peak member-end strains under an ensemble of design moderate earthquakes defined at the bottom of the pile.4. An efficient method has been developed for a problem of seismic-drift constrained design of a coaxialy coeccentric shear building with a basement of specified high stiffness in the form of Taylor series representation of earthquake-response constrained designs in terms of a flexibility parameter of the basement stiffness about the known seismic-drift constrained design of a shear building without basement.5. A computational method has been developed of generating an ordered set of seismic response-strain constrained designs of vertically excited double-layer grids, with respect to a parameter which specifies the design strain level.