加强地方地震工作的重要性

结合龙岩市防震减灾工作的实际,分析地方地震部门所具有的社会职能,并从宏观职能、微观职能、联合职能、管理职能4个方面进行探讨,说明地方地震部门应正确行使职能,提出加强地方地震工作的重要性。     

高阻尼隔震橡胶支座的相关性试验研究及其参数取值分析

本文目的是研究各种因素对新型桥梁高阻尼隔震橡胶支座(简称HDR)水平剪切性能的影响。采用反复加载试验方法,进行了HDR支座剪应变相关性、压应力相关性、加载频率相关性、反复加载次数相关性、温度相关性、老化相关性等试验,研究了其相应因素对HDR支座滞回环面积、屈服强度、等效阻尼比、屈服后刚度、等效刚度的影响。试验结果表明,加载频率、反复加载次数、温度、老化对HDR支座表征阻尼特征的指标影响较大,而对其刚度影响相对较小。通过对试验曲线的分析,给出了G值为0.64 MPa,100%剪应变时设计等效阻尼比为12%的HDR支座的等效剪切模量、等效阻尼比、屈服强度、屈服前刚度、屈服后刚度随剪应变变化的经验公式。     

基于熵权的属性识别模型在海水入侵现状评价中的应用

针对海水入侵现状评价中单指标(Cl^-或矿化度)评价方法的片面性和不确定性等问题,本文将熵值理论和属性识别模型相结合,建立了熵权属性识别模型,并将其应用于滨海地区海水入侵现状评价中。以潍北平原8 个海水入侵实测点为应用实例进行研究。结果表明,潍北平原大部分地区海水入侵属于轻度侵染,水质为微咸水,东部地区(6、8 号点位)在5 月份海水入侵属于较严重侵染,但在11 月份侵染程度减缓,可能的原因是气候因素(降水增加、海平面上升)以及人为因素(地下水抽水量减少)等共同影响的结果。同时,5 月及11 月各个测点海水入侵侵染排序略有差异,但是差异较小。通过实例证明,该方法通俗易懂,计算方法简洁明了,便于掌握和应用,为海水入侵现状评价提供了一种可行有效的方法。     

某核电厂应急指挥中心基础隔震研究

应急指挥中心是核电厂应为紧急核事故而专设的指挥中心,本文对某核电厂应急指挥中心进行基础隔震设计,分析了隔震效果;建立了各楼层的楼层反应谱,对比分析了隔震前后结构楼层反应谱与目标反应谱的关系。结果表明,隔震后结构明显降低了应急指挥中心的地震反应,同时,其楼层反应谱也大大降低,确保核电厂应急指挥中心在应急抢险中充分发挥其功能作用。     

Dynamic characteristics of a novel damped outrigger system

This paper presents exact analytical solutions for a novel damped outrigger system, in which viscous dampers are vertically installed between perimeter columns and the core of a high-rise building. An improved analytical model is developed by modeling the effect of the damped outrigger as a general rotational spring acting on a Bernoulli-Euler beam. The equivalent rotational spring stiffness incorporating the combined effects of dampers and axial stiffness of perimeter columns is derived. The dynamic stiffness method(DSM) is applied to formulate the governing equation of the damped outrigger system. The accuracy and effi ciency are verifi ed in comparison with those obtained from compatibility equations and boundary equations. Parametric analysis of three non-dimensional factors is conducted to evaluate the infl uences of various factors, such as the stiffness ratio of the core to the beam, position of the damped outrigger, and the installed damping coeffi cient. Results show that the modal damping ratio is signifi cantly infl uenced by the stiffness ratio of the core to the column, and is more sensitive to damping than the position of the damped outrigger. The proposed analytical model in combination with DSM can be extended to the study of structures with more outriggers.     

汶川县威州镇砖混结构房屋抗震加固设计

针对在5.12汶川大地震中,汶川县城所在地-威州镇遭受中等破坏的砖混结构房屋,通过某工程实例,给出了该类房屋具体的加固设计和施工方法,加固前绝大数楼层的综合抗震能力指数小于1,加固后所有楼层的综合抗震能力指数大于1。最后提出了一些建议,为类似工程提供一些参考。     

测震台址勘选数据处理辅助程序设计与应用

针对测震台址勘选中数据处理的重要性和计算结果的真实性,避免在数据处理过程中因手工分析计算出现错误,通过深入分析手工计算流程,设计编写了一套辅助控制程序,配合EDSP-IAS和地噪声处理软件,实现勘选数据处理流程的自动运行与管理,避免因人为因素出现差错,为台址勘选实测地噪声值数据批处理提供便捷。该辅助程序可用于烈度速报新建台址勘选数据批处理工作。     

Theoretical and experimental research on a new system of semi-active structural control with variable stiffness and damping

In this paper, a new system of semi active structural control with active variable stiffness and damping (AVSD) is suggested. This new system amplifies the structural displacement to dissipate more energy, and in turn, effectively reduces the structural response in the case of relatively small story drifts, which occur during earthquakes. A predictive instantaneous optimal control algorithm is established for a SDOF structure equipped with an AVSD system Comparative shaking table tests of a 1/4 scale single story structural model with a full scale control device have been conducted. From the experimental and analytical results, it is shown that when compared to structures without control or with the active variable stiffness control alone, the suggested system exhibits higher efficiency in controlling the structural response, requires less energy input, operates with higher reliability, and can be manufactured at a lower cost and used in a wider range of engineering applications.     

增温对半干旱区春小麦田间水分特征的影响

采用红外线辐射器增温法,通过增温模拟试验研究了增温对半干旱区春小麦田间水分特征的影响。结果表明,随着温度增加,叶片水势不断降低,增温1.0℃和2.0℃的春小麦叶片水势比没有增温的春小麦叶片水势日平均分别降低了2.61%和4.45%。土壤水势随着土层深度的加深呈缓慢增加趋势。温度增加,不同土层深度的土壤水势均呈不断降低的趋势,温度增加越多,降幅越大;增温与土壤含水量之间存在着显著的负相关关系。增温能够明显降低春小麦田间土壤贮水量,增加农田总蒸散量。在高温情况下,湿润处理增加了土壤总贮水量,尤其是在拔节期以后。春小麦0~160 cm土壤贮水消耗量在100 cm以上随温度的增加呈逐渐增加的趋势,而在100 cm以下深层变化趋势不明显。增温2℃,湿润处理0~160 cm土壤贮水消耗量要高于正常供水和干旱处理。     

基于数字城市的关键技术应用研究

阐述了数字城市的产生背景、概念与国内研究现状,提出了数字城市的框架体系和应用研究内容,进一步研究分析了数字城市建设所依赖的关键技术。