基于Prager硬化的钢管混凝土非线性梁单元

根据三类钢管混凝土构件的荷载位移曲线论述了Prager硬化规则应用于钢管混凝土材料非线性分析的合理性,由随动硬化材料屈服面方程的全微分出发,采用塑性势理论推导了钢管混凝土梁单元的非线性刚度矩阵。建立了钢管混凝土梁单元的初始屈服面方程,由Prager硬化规则建立了后继屈服面方程,并推导了屈服面移动量的计算公式。根据钢管混凝土的特点,探讨了确定硬化参数的方法。算例的结果有良好的精度。     

TLD控制的钢结构振动台模型试验研究

本文通过钢结构的振动台模型试验,研究了在刚性地基条件下矩形调谐流体阻尼器(TLD)对结构地震反应的减震机理和减震效果,为进一步研究土-结构相互作用对结构TLD减震控制效率影响的振动台模型试验提供对比数据。试验结果表明,在水箱中设置铁丝网有助于提高TLD的减震效率,地震动的频谱特性和峰值加速度大小对TLD的减震效率有重要影响。     

规则钢筋混凝土异形柱框架结构的抗震性能研究

本文按现行规范及技术规程设计了设防烈度为8度的一个规则的钢筋混凝土异形柱框架,并进行了单向水平地震作用下的空间三维非线性地震反应分析,考查了异形柱框架结构在设防和罕遇地震水准下的整体抗震性能,对结构能否达到抗震设防目标进行了初步评价。结果表明,8度区按规范设计的结构在设防烈度及罕遇烈度地震作用下基本能够达到预期的抗震设防目标。     

Flexural–torsional behaviour of steel reinforced concrete members subjected to repeated loading

This paper presents an experimental investigation of the inelastic behaviour of steel reinforced concrete (SRC) members under cyclically applied bending and torsional loading. Fourteen steel reinforced concrete members made from three structural‐steel sections with different cross‐sectional properties were tested under various combinations of bending and torsion. Results indicate that the ultimate flexural capacity of an SRC member was significantly reduced under a moderate degree of torsion. Based on these findings, a quantitative evaluation of the effect of torsion was made and a simplified interaction curve between bending and torsion is proposed. Copyright © 2000 John Wiley & Sons, Ltd.     

基于WebGIS的网络国土资源信息系统的设计与实现

国土资源管理信息化、网络化是政府部门上网工程的一项重要内容之一。本文从分析WebGIS的特点和功能及其实现模式入手,提出了建立基于WebGIS技术的网络国土资源信息系统的实现方案。从系统的可行性分析,系统设计,系统结构,功能设计,数据库,网络安全等方面进行了详细论述。最后,通过实际应用证明方案是可行的。     

Seismic behaviour of hybrid systems made of PR composite frames coupled with dissipative bracings

The paper investigates the dynamic behaviour of hybrid systems made of partially restrained (PR) steel–concrete composite frames coupled with viscoelastic dissipative bracings. A numerical model that accounts for both the resisting mechanisms of the joint and the viscoelastic contribution of the dissipative bracing is introduced and briefly discussed. The model is first validated against experimental outcomes obtained on a one‐storey two‐bay composite frame with partial strength semi‐rigid joints subjected to free vibrations. A number of time‐history analyses under different earthquake ground motions and peak ground accelerations are then carried out on the same type of frame. The purpose is to investigate the influence of the type of beam‐to‐column connection and property of the viscoelastic bracing on the performance of the hybrid system. The inherent stiffness of the bare PR frame and the plastic hysteresis of the beam‐to‐column joints, which always lead to only limited damage in the joint, are found to provide a significant contribution to the overall structural performance even under destructive earthquakes. This remark leads to the conclusion that the viscoelastic bracing can be effectively used within the hybrid system. Copyright © 2008 John Wiley & Sons, Ltd.     

一种基于平面地质图的复杂断层三维构建方法

在分析平面地质图数据特点的基础上,为准确表达复杂断层的空间几何形态和相互之间的关系,引入了由地质形体的轮廓线构建而成的线框架模型概念;修正了边界表示法模型有效构建的基本条件;从地层与断层之间的关系角度详细阐述了有效构建线框架模型的方法;提出了以线框架模型为基础的断层面整体构建技术思路,解决了复杂断层面三维构建问题。     

地铁基坑施工稳定性监测分析

沈阳地铁十六标段过新开河段区间隧道采用明挖施工,基坑采用钻孔灌注桩联合钢支撑结构体系以维护基坑稳定。开挖过程中,对桩体位移、桩体内钢筋应力、钢支撑轴力以及地面沉降等进行监测。监测结果和实际工程效果表明,采用钻孔灌注桩联合钢支撑结构体系可以维护基坑稳定,减少基坑开挖对周围环境的影响。     

海上大直径钢管桩打桩过程中桩周土强度弱化研究

海上大直径钢管桩打桩过程中,桩周土体受到强烈扰动而发生强度弱化,掌握桩周土体强度弱化规律对于准确预测打桩过程、保证工程安全具有重要意义。为研究土体强度弱化规律,开展了环剪试验模拟打桩对桩周土体的扰动,测试土体强度随剪切速率的变化规律,建立了描述土体强度弱化规律的拟合公式,引入到打桩分析软件中。研究结果表明：土体的强度折减程度不仅与土体本身的性质有关还受到土体的埋深和剪切速率的影响,埋深越深土体强度折减程度越低,剪切速率越高土体强度折减越高,在打桩分析中可采用这里推荐的线性折减方法来模拟不同深度处土体强度的折减规律。