Shaking table study on seismic behavior of MSE wall with inclined backfill soils reinforced by polymeric geostrips

In this study, the seismic behavior of a mechanically stabilized earth (MSE) wall with inclined backfill is investigated under sinusoidal acceleration excitations using a series of 1-g shaking table tests performed on the MSE model of 150 cm in height reinforced with polymeric geostrips. The effects of the stiffness of the reinforcement and slope angles of the backfill soil on the acceleration amplification factor (RMSA), the lateral displacement of the wall, the surface displacement of the backfill, the distribution of dynamic earth pressure along the height of reinforced wall and the strain distributions on the surfaces of the polymeric geostrips in three planes of the wall are investigated. The experimental results show that the dynamic earth pressure determined by traditional pseudo-static approaches leads to overestimated values. In addition, increasing the inclination angle of backfill soil results in the increase of surface settlement, lateral wall displacements, soil dynamic earth pressures, acceleration amplification factors and strains on the polymeric geostrip materials. The stiffness of the polymeric geostrip material has a negligible effect on the displacement, dynamic earth pressures and failure surface geometry.     

带箱形转换层的高层建筑结构设计

通过带箱形转换层的高层建筑结构的设计实例,在分析计算的基础上对结构体系的选择、结构细部设计进行了详细的论述,特别是对箱形转换层的有限元分析为设计提供了可靠的依据,为此类超限高层的设计总结出了一套有效可行的设计分析方法。     

墙板对火灾下钢柱截面温度分布的影响

在钢结构的抗火设计中，必须了解钢构件截面温度随时间的变化。本对一侧带有墙板的钢柱在火灾下的升温和截面温度分布进行了有限元分析研究，通过数据拟合并对比现有计算方法，得到了带墙板钢柱截面平均温度和温度分布的简化方法，为进一步进行这种条件下钢柱的抗火设计提供了基础。     

Simulation of air flow in the IEA Annex 20 test room—validation of a simplified model for the nozzle diffuser in isothermal test cases

The modeling of air supply devices has been identified from the International Energy Agency (IEA) Annex 20 project as one of the most important problems in applying computational fluid dynamics (CFD) to predict air flow pattern and air distribution in buildings, and the complicated HESCO nozzle diffuser used in the IEA Annex 20 test room has been proved to be particularly difficult to model. In a previous study, a simplified model for this diffuser was developed and validated against experimental data. It has been shown that this model can yield good prediction for the wall jet flow issued from the diffuser, but whether this model is capable of correctly predicting the global flow pattern in the whole test room was not known. In this paper, the benchmark data of the IEA Annex 20 Test Cases B2 and B3 were used to evaluate the performance of the model for the prediction of the global air flow pattern in the test room. It was demonstrated that this model can predict the air flow pattern in the whole test room for both the Test Cases B2 and B3 with reasonable accuracy. The significance of a velocity correction when comparing the numerical prediction with experimental data obtained using omni-directional anemometers was also discussed.     

某砖结构房屋沉降裂缝的分析及修复

某砖结构房屋在验收过程中，发现位于伸缩缝两侧的第1层墙体和顶板存在裂缝。通过计算分析，该结构基底反力的差异较大，产生地基不均匀沉降，从而在局部墙体产生较大的剪应力，造成墙体及局部楼板开裂。本文分析了裂缝产生的原因，讨论了裂缝对结构的危害，提出了相应的修复措施，以供设计参考。     

逆作法施工技术浅析

逆作法施工技术是深基础高层建筑施工的有效方法。它主要特点是可节约工期，最大限度地减少工程基础施工对相邻建筑物的影响。本文简要介绍厦门九州大厦地下室逆作法施工方法以及为适应逆作法施工的结构构造处理措施。     

某中学教学楼基础设计

通过对某中学教学楼的基础设计,探讨如何在陡坡上利用深、浅基础相结合的方式设计纵长建筑物的基础。     

大尺度线性遗产区域景观特征识别——以北京长城文化带为例

在国家文化公园建设背景下,国家对于大尺度线性遗产所在区域的保护工作日益重视,但对大尺度线性遗产所在的带状区域景观特征识别的研究尚属空白。以北京长城文化带为研究区域,基于景观特征评估(LCA)理论,借助地理信息系统(GIS)技术,围绕长城防御、屯垦和军情3个历史功能,构建由长城边墙、城堡和烽火台组成的文化遗产要素识别框架,探索大尺度线性遗产区域景观特征识别的技术路径和实现手段。在对自然景观要素和文化遗产要素进行分类、融合的基础上形成31种景观特征类型,针对不同的景观特征类型进行关键特征识别,深入研究自然景观与文化遗产的耦合关系及其形成机制,以期对中国的大尺度线性文化遗产区域总体评估和保护利用提供借鉴与参考。     

发掘"明文化"的实践--南京狮子山周边环境改造工程

介绍南京狮子山周边环境改造工程的规划设计构思。南京狮子山周边环境改造工程的规划设计，从场地和区域的自然和历史地理分析出发，注重历史元素的提炼，力求使传统文化与现代功能要求结合，形成狮子山地区富有历史底蕴，融“山、水、城、林”为一体的城市特征形象。