泉州市区桩基应用的类型与特点     

朱建成 《福建地质》2006,25(1):43-47

通过对泉州市区岩土工程勘察、设计、施工及检测资料统计,总结了泉州市区桩基应用的类型与特点,并结合典型的实例说明桩基类型的选择应在安全的基础上,选择经济和合理的基础类型。  相似文献   

Passive and active control of three‐dimensional buildings     

Yoyong Arfiadi  Muhammad N. S. Hadi 《地震工程与结构动力学》2000,29(3):377-396

The majority of the recent research effort on structural control considers two‐dimensional plane structures. However, not all buildings can be modelled as plane structures, thus limiting the capability of the proposed procedures only to regular and symmetrical structures. A new procedure is developed in this paper to analyse three‐dimensional buildings utilizing passive and active control devices. In the building model, the floors are assumed rigid in their own plane resulting in three degrees of freedom at each floor. Two types of active control devices utilizing an active tuned mass damper and an active bracing system are considered. The effect of passive mass dampers and active control force in the equations of motion is incorporated by using the Hamilton's principle. The passive parameters of the dampers as well as the controller gain is then optimized using a genetic based optimizer where the H₂, H_∞ and L₁ norms are taken as the objective functions. Copyright © 2000 John Wiley & Sons, Ltd.  相似文献   

Study on numerical simulation to water lowering in an open coal mine digging     

Yanjun ZHANG  Fenglong ZHANG  Fuli QI  Fuquan NI 《世界地质(英文版)》2006,9(2)

In view of the situation of excavation of open coal mine for the underground water disaster, we should carry out simulation studies for the numerical value of the water lowering project and improve the accuracy and the level of the water lowering project. On the basis of the hydrological geological conditions of certain open mine digging, a more reasonable seepage numerical model was built according to MODFLOW. It was simulated in advance that the process of the confined water level descending with the time, and combining with the actual observations to test the correctness of the model. The calculation showed that the results coincided well with the results of actual measurement. Based on this, different water lowering numerical simulations were built for the open coal mine digging. It could be simulated and forecast that the changes of the groundwater level in drainage process within and outside the mine pit, and it was quantitatively assessed that the possible water lowering result of the opencast water drainage process, which provide an important basis for the actual water lowering project and the possible project disposal.  相似文献   

细腰复杂截面高层建筑抗震性能分析   总被引：1，自引：1，他引：0       下载免费PDF全文

甘丹  张敬书  莫庸  王尔昌  周丽 《地震工程学报》2008,30(4):376-379

使用PMCAD软件,通过某模型工程对细腰复杂截面高层建筑结构的抗震性能进行了分析.结果显示细腰的程度越大,结构整体抗震性能越差.认为细腰平面做为组合平面的一种,在所列三项及三项以上不规则高层建筑做为其中一项进行控制,而不单独做为一项进行控制较为合理.  相似文献   

汶川地震中都江堰市的房屋震害   总被引：27，自引：5，他引：22  

张敏政 《地震工程与工程振动》2008,28(3):1-6

对汶川地震中都江堰市1 005栋房屋的现场震害调查资料进行了统计分析。分析表明,经抗震设计的房屋的震害明显低于未经抗震设计的房屋,前者实现了预期的抗震设防目标;在经抗震设计房屋中,钢筋混凝土框架结构房屋的震害相对较轻,底框架砌体结构房屋和砌体结构房屋次之;中高层建筑和低层建筑的震害比多层建筑轻;学校、医院等公用建筑的损坏与住宅建筑相比较重。  相似文献   

不同比例钢-混凝土混合结构高层建筑动力相似关系试验研究   总被引：3，自引：0，他引：3  

吕西林  沈德建 《地震工程与工程振动》2008,28(4)

模型试验的动力相似理论是结构抗震试验技术中的一个基础性研究课题。本文设计实现了1/10、1/20和1/30三个不同比例的钢-混凝土混合结构高层建筑的振动台模型试验。通过对三个模型试验结果的对比研究,对钢-混凝土混合结构高层建筑的动力相似关系进行了初步探讨。试验结果表明,按照本文的动力模型的设计施工及试验要求进行的不同比例钢-混凝土混合结构高层建筑的振动台试验,在自振频率、振型、加速度放大系数、楼层最大位移、楼层剪力等动力特性和动力反应方面具有较好的相似性。试验结果一方面说明对这三个模型采用的动力相似关系和制作方法是合理的,另一方面也说明了对钢-混凝土混合结构房屋采用较小的1/30比例进行振动台试验是可行的。  相似文献   

安徽省农村民居地震安全的问题剖析与对策研究   总被引：2，自引：0，他引：2  

苏小妹  苏小娟 《华南地震》2008,28(3):56-62

阐述了目前安徽省农村民居地震安全工作中存在的主要问题,分析了产生这些问题的原因．从不同角度提出了对策措施。  相似文献   

错位转换层位置对高层建筑竖向构件受力性能影响的研究     

沈朝勇  周福霖  黄襄云  陈建秋  任珉  金建敏 《华南地震》2008,28(3):1-10

作为一种新型转换层结构——错位转换层结构,其竖向位置的移动对高层结构在水平地震作用下竖向构件受力性能有何影响目前尚未见文献报道。采用有限元程序对高层带错位转换层结构进行了水平地震作用下的时程反应和反应谱分析．分析了上部转换层和下部转换层相对位置保持不变的情况下．整体改变错位转换层位置对结构地震作用、剪力及竖向构件内力的影响。分析研究发现。错位转换层整体位置的竖向移动对结构整体剪力、上部转换层下承托墙肢内力、上部转换层框支剪力墙内力影响不大．但对落地剪力墙、上部转换层下框支柱和下部转换层梁托柱内力有较大影响。  相似文献   

模型正演技术在兴城地区叠前深度偏移中的应用   总被引：3，自引：3，他引：0       下载免费PDF全文

李素华  王云专  范兴才  卢齐军 《地球物理学进展》2008,23(4):1216-1222

松辽盆地徐家围子断陷兴城地区火山岩埋藏较深,断层发育且倾角较大,构造极其复杂,常规时间域成像效果较差,且火山岩屏蔽作用明显影响到下伏地层成像精度,对构造解释造成了一定影响.针对这一问题,采用波动方程正演模拟技术,建立反映该区实际复杂构造的模型,进行正演模拟,然后将模拟的炮集记录进行常规处理和叠前偏移处理,重点是叠前深度偏移处理.模拟结果表明,将模型正演技术应用到实际地震资料的处理中,有助于指导实际地震资料中速度-深度模型的建立,并且对于提高复杂构造的成像质量具有非常重要的作用,而且有利于下一步验证构造解释方案是否合理.  相似文献   

A fast approach to regional earthquake hazard evaluation based on population statistical data     

危福泉  蔡宗文  焦双健  魏巍  黄宏生  付再扬  黄天洲  陈琳 《地震学报(英文版)》2008,21(5):519-525

In the prediction process of large-scale earthquake damage occurred in urban and rural regions,new models and approaches,which are different from traditional ones,should be adopted to rapidly predict earthquake damage. This article utilizes sampled population and buildings data that is easily available from the statistical database to conduct vulnerability analysis of buildings on the basis of earthquake damage of existing urban buildings in an analogical way,so as to provide a relation model between population data and disaster losses. In virtue of this model,the average vulnerability matrix of buildings of different structures in Fujian Province is established,the matrix adjustment coefficient of different decades is developed in accordance with the economic conditions,and the rapid evaluation system is set up as well. The result shows: this evaluation model,based on the population statistical data has merits as small investment,automatic data prediction,regular updates,as well as the advantage of easy accessibility.  相似文献