地震作用下泉州古塔结构反应分析

泉州一带历史上经常发生地震。1604年泉州曾发生大地震，地震烈度约为8度。开元寺的镇国塔的顶盖尖石在地震中坠下打坏了下面各层的部分石栏杆。但是，仁寿塔却毫无损坏。因此，本文通过大量计算和实测，分析在公元1604年泉州东北方向海里发生的一次强烈地震而幸存下来的石结构古塔抗震性能，并为以后塔体的维修及加固提供一些有用的数据。     

柱承式筒仓的地震反应分析

柱承式筒仓由于其特殊的结构形式和受力特点,在地震作用下极易发生柱顶破坏。为了深入研究柱顶破坏机理,寻找改善支承柱受力特性的方法,本文利用有限元程序ANSYS进行水平地震时静力和动力时程分析,提出了柱承式筒仓柱顶内力放大系数,以供柱承式筒仓支承柱的地震设计与研究参考。     

2-D analysis of circular tunnel against earthquake loading

The use of underground structures such as tunnel for subways, highways, material storage, and sewage and water transport is increasing in developed countries. The safety of these facilities during operation in areas with seismic activities such as in Japan, Taiwan and Turkey in recent earthquakes has been questioned. Dynamic effects on these structures are in the form of deformations that they experience during earthquakes. In this paper, first latest methods on the subject are reviewed and then the interaction between the ground and tunnel lining during earthquake excitation is investigated by a finite difference computer program (CA2). Analysis show that a good agreement between analytical closed form and numerical solutions exist. According to the results obtained in this study some practical suggestion for using closed form solution are also given.     

汶川地震中单层钢筋混凝土柱厂房典型震害分析

通过对四川江油市、成都市、彭州市、绵阳市汉旺镇、甘肃天水市、陕西汉中市单层钢筋混凝土柱厂房的震害调查,以及对典型震害的分析,得出以下结论:按抗震规范设计的建筑,钢筋混凝土主体结构破坏轻微;非结构构件震害相对比较严重,特别是纵墙端开间、高大山墙、高低跨悬墙,以及高大设备和基础的连接;未进行抗震设计且未进行加固的老厂房震害一般较严重。为此,要特别加强非结构构件和高大设备的抗震设计,对未进行抗震设计的老厂房要尽快安排抗震加固。     

基于生态安全格局的灾后山地城乡规划重建

通过对生态安全的内涵分析.探讨了生态安全格局建立的技术框架,并以宝鸡市台塬区规划为案例分析,详细剖析了生态安全格局建立的方法过程,以期对震后灾区城乡规划重建工作提供一些有益的参考。     

多跨等高单层厂房纵向结构基本自振周期的计算

结构的基本自振周期的计算是抗震计算的关键问题之一。本文就单层厂房纵向基本自振周期简化计算方法的现状及存在问题作了综述,并提出了自己的见解,可供工程应用时参考。     

Seismic response analysis of structures with velocity-dependent dampers

This paper is concerned with seismic response analysis of structures with velocity-dependent passive energy dissipation devices, such as viscous and viscoelastic dampers. The modeling of a damper-brace component composed of a viscous or viscoelastic damper connecting with braces in series is presented. Several key parameters influencing the energy dissipation efficiency of such dampers in the damper-brace component are investigated and the relationships of the parameters and efficiency of the dampers are established. An equivalent model for the passive energy dissipation system is developed, which can significantly simplify the dynamic analysis of structures with the velocity-dependent dampers. The seismic responses of a single-story structure and a multi-story structure with the viscous and viscoelastic dampers are analyzed to verify the effectiveness of the passive energy dissipation devices for suppression of dynamic responses of structures and the reliability of the proposed simplified computational methods.     

Effect of damping model on pre-yielding earthquake response of structures

The present paper examines differences between responses of single-degree-of-freedom (SDOF) systems with viscous and hysteretic damping to earthquake ground motions. Only responses within yield limits are considered. The structural behavior of SDOF systems with hysteretic damping is modeled by a generalized elasto-slip model of the Masing type. The model leads to a force–displacement relationship similar to that proposed by Ramberg and Osgood. The responses of the two systems are compared for a number of earthquake records. To achieve consistent comparison, parameters of the linear system with viscous damping are determined by the secant stiffness method. In many cases significant differences in the peak displacement responses and energy values have been observed between the systems. This indicates that the prediction of the response of structures to earthquake ground motions before yielding based on linear models with viscous damping may not be as accurate as used to be believed. Tentative estimates of error associated with such predictions are presented.     

工程地震动模型化研究综述及展望（Ⅱ）：平稳模型及均匀调制过程

综述了几十年来地震工程模型化研究的发展模型地分析了目前常用的平稳模型及均匀调制过程。     

城市地震灾害经济损失预测方法综述

本文结合城市地震灾害损失大、牵连性强的特点,对现有地震灾害损失的预测方法进行了讨论和评述,认为在地震灾害损失预测时应把受灾城市看作一个灾场,充分考虑城市各系统之间的相互影响和作用,最后指出了进一步研究的方向和内容。