艺术墙幕墙索网次结构-主体钢结构共同工作设计研究

河南艺术中心40m高悬臂玻璃艺术墙,采用"单层索网次结构-平面钢管相贯桁架主体结构"体系。对幕墙索网次结构与主体钢结构的共同工作、主次结构转换的"索-钢接触"连接约束条件对主体钢结构及索网次结构的影响进行研究。考虑索网次结构与主体钢结构共同工作,对主体结构稳定安全性有利,但对幕墙索网次结构安全性有较大的不利影响。根据研究结果要求幕墙设计单位对索网次结构进行加强设计,确保了工程整体结构的安全。     

Barriers and outcomes in the housing searches of new immigrants and refugees: a case study of “Black” Africans in Toronto’s rental market

Toronto is Canada’s main port of entry for new immigrants and refugees as well as the country’s most culturally diverse city. It is also one of the most expensive housing markets in Canada. This study examines the housing experiences of three relatively recent, Portuguese-speaking African immigrant groups—the Angolans, the Mozambicans, and the Cape Verdeans—in Toronto’s rental market, by examining their settlement experiences and housing search processes, as well as the outcomes of those searches. The evidence indicates that most respondents experienced discrimination by landlords in their housing search (this was less of a problem for the Cape Verdeans, who have a lighter skin colour). Both Angolans and Mozambicans encountered significant barriers in locating and securing affordable housing in a suitable neighbourhood. The study also examines their relations with the established white Portuguese community. Clearly, race (the colour of one’s skin) still matters in Toronto’s rental housing market. Racism—whether real or perceived—can result in social exclusion and housing segregation of immigrant groups in low-income neighbourhoods, and thus a slower integration of newcomers into Canadian society. This study points to the need for more comparative studies on visible and non-visible minorities, including newcomers from Africa (whether English-, French-, Spanish-, or Portuguese-speaking), to understand why certain groups are more successful than others in finding affordable housing in a neighbourhood of their choice.     

土—结构动力相互作用对滑移隔震结构的影响

利用上部结构和地基土对基础—土交界面上离散节点的动力平衡,建立整个结构在频域内的运动方程,分析土—结构动力相互作用下的滑移隔震结构对建筑结构地震响应的影响,并较为系统的计算了在不同地基土的参数组合下结构的隔震效果和地震响应,得出一些有指导意义的结论。     

下部支承结构对网壳结构强震响应的影响研究

总结了关于考虑下部支承影响的网壳结构强震失效研究的最新研究成果。介绍了基于响应的荷载域全过程分析方法;通过建立精细化的数值模型,对考虑下部支承结构的单层球面网壳在强震作用下的特征响应进行了分析,得到了考虑下部支承结构的单层球面网壳在强震作用下的失效特征;通过大规模参数分析,详细地阐述了下部支承结构对网壳结构失效极限荷载的影响;提出了对于耦合体系的简化分析方法并初步研究了非线性下部支承结构对网壳结构失效的影响;讨论了下部支承结构非线性对网壳结构响应的影响。研究表明,非线性材料的支承结构也将明显改变耦合体系的响应规律及失效模式。     

Shaking table model test of a mega‐frame with a vibration control substructure

A mega‐frame with a vibration control substructure (MFVCS) is a tuned mass damper system that converts substructures into a tuned mass. In this study, a kind of MFVCS using lead–rubber bearings (LRBs) to connect the vibration control substructure to the mega‐frame was proposed. To investigate the damping effect of this MFVCS, a series of shaking table tests were conducted, and the seismic responses of the MFVCS were compared with those of the traditional mega‐frame structure (TMFS). The results show that the seismic responses of the MFVCS are clearly smaller than those of the TMFS; additionally, the proposed MFVCS can provide a sufficient damping effect under different ground motions. Finite element (FE) models of the TMFS and MFVCS were established and validated by experimental results. Finally, the simulation results adopting different LRB models (equivalent linear and nonlinear elements) were compared, and the results indicate that simulation results can be obtained with greater accuracy from the FE model with a nonlinear LRB model than that with a linear LRB model.     

弹性试件的实时子结构试验等效力控制方法

等效力控制方法用反馈控制代替迭代过程求解实时子结构试验隐式逐步积分方法的非线性方程。通过对具有弹性试件体系的数值模拟和试验进一步验证实时子结构试验等效力控制方法的有效性。首先介绍实时子结构试验等效力控制方法的原理;然后以一单自由度体系为例介绍比例-微分等效力控制器的设计方法,并用劳斯判据分析反馈控制系统的稳定性;接着对一具有弹性试件的单自由度体系进行单步输入反应、自由振动反应和受迫振动反应的数值模拟;最后通过对具有弹簧试件的单自由度体系的单步输入、自由振动和受迫振动反应的实际试验验证此方法的有效性。分析结果表明,只要反馈控制系统中各参数均选正值此系统就是稳定的。数值模拟和试验的结果都表明,等效力控制方法可以取得非常好的稳定性和精度。     

子结构方法在ANSYS软件中的应用

本文介绍了子结构方法在ANSYS（CAE软件）中的应用,及该方法使用步骤。通过对一悬臂矩形板实例的计算结构与分析,使子结构模态综合法与ANSYS软件有机的结合,具有一定的可行性和实用性。     

动态子结构技术的研究

提出了具有连接子结构的固定界面模态综合法。基于本方法编制了三个子结构的固定界面模态综合法程序。所结算例表明 ,该方法计算量小 ,精确度高 ,可用于复杂耦合系统的动态特性分析。     

Synchrotron based reciprocal space mapping and dislocation substructure analysis

During plastic deformation of FCC materials, dislocation density does not evolve uniformly but a dislocation cell/wall structure is formed. X-ray diffraction reciprocal space mapping is used to investigate this substructure within a single grain in a large grained aluminium polycrystal. A simple dislocation cell/wall model capable of computing numerical reciprocal space maps is presented. The model qualitatively captures the experimentally observed features.     

框架结构仿真分析模型的选取与比较

通过理论分析及数值计算,首先对框架结构施工仿真分析的几种常用计算模型进行了比较及分析,指出各自的特点及存在的问题。其次,针对框架结构仿真,本文在总结前人工作的基础上提出一种新的计算模型。该模型将整个结构分为基本结构和递推结构两部分,采用子结构矩阵位移法来分析。基本结构及前阶子结构对后阶子结构的影响通过弹性约束来模拟。最后通过数值计算,显示该模型既符合实际又便于数值处理。