基于Liapunov理论的结构非线性振动的混合控制

研究了地震激励下高层建筑进入塑性阶段后，结构非线性振动的混合控制问题。高层建筑简化为剪力墙形式，具有非线性滞变恢复力。采用被动基础隔振和主动控制力相结合的策略，对结构的非线性振动进行混合控制。基于Liapunov第二法，从系统的能量角度出发进行稳定性分析，找到控制系统的Liapunov函数，本着工程抗震设计中安全与经济的原则，应用允许结构反应进入非线性或塑性阶段的理论，判定所提出的混合控制方法具有Liapunov意义下的稳定。     

考虑风-结构-土耦合作用时高层建筑顺风向风振响应分析

本文综合考虑了风-结构-土的耦合作用对高层建筑顺风向风振响应的影响，研究了在各种参数下高层建筑风振响应的特性。由于在风-结构-土耦合作用问题的整个体系的控制方程中，既有时域中的耦合关系，又有频域中的耦合关系，本文提出采用傅立叶变换-时频迭代法来进行求解，较好地解决了用普通的方法难以解决的问题。最后采用数值计算的方法比较了考虑风-结构-土的耦合作用和仅考虑土-结构相互作用以及刚性基础的结构位移响应及加速度响应。     

基于建筑风场数值模拟的网格层块加密法

在建筑风场的数值模拟中,当前普遍采用的离散网格多是计算前一次性布置的固定网格,通常很难适应实际流场变量的变化要求.为提高数值模拟的精度,基于结构化同位网格系统及控制容积离散微分方程的方法,将适应性网格局部加密(AMR)的思想引入到采用压力校正迭代算法的建筑风场模拟中,提出了一种半自适应的层块网格加密方法.该方法可结合误差分析对误差较大的区域网格实行自动判别并实施逐层块状加密.算例分析表明,该方法能在较高的效益下提高数值解的精度.     

公寓铝幕墙风荷载体型系数精细化分析

本文以北京冬奥运村公寓建设项目为工程背景,采用计算流体力学,基于大涡模拟对铝幕墙空腔装饰构件的风荷载体型系数进行研究．研究发现,在不同工况下,装饰构件法向风荷载体型系数整体大于切向风荷载体型系数,拐角区域的装饰构件会比平直区域的装饰构件受到更大的风压作用;建筑的风荷载体型系数的变化幅度会随着所在高度的增加而愈发明显．研究结论对该工程的幕墙设计及其连接件设计提供了精细化的荷载数据．     

Generalized Blueprints and p-adic Buildings I

This paper generalizes the notion of a blueprint as defined by M. Ronan and J. Tits in 1987. These more generalized blueprints can be used to achieve purely combinatorial constructions of affine buildings over p-adics field, depending only on the associated affine diagrams and the structure of the integers inside the appropriate fields.     

Simulation on spread of fire smoke in the elevator shaft for a high-rise building

Spread of fire smoke in the elevator shaft of a high-rise building is influenced by many driving facts. We simulate smoke spreading in the elevator shaft, stair room, and pre-chamber with and without different supplied pressurized air. The simulation shows that smoke moves very fast in the elevator shaft. When a 12 floor high-rise building is in fire, smoke can fill up the elevator shaft in less than 1.5 min after a fire started, temperature in the elevator shaft can be higher than 187°C in 5 min, and the concentration of CO can also reach a high level. The elevator shaft has a very low visibility in less than about 100 s.     

Immeubles de Kac–Moody hyperboliques, groupes non isomorphes de même immeuble (Hyperbolic Kac–Moody Buildings Nonisomorphic Groups with the Same Building)

We first remark that Kac–Moody groups enable us to produce hyperbolic buildings – automatically endowed with nonuniform lattices. The main result then deals with groups whose buildings are trees or two-dimensional hyperbolic. It is a factorization theorem for abstract isomorphisms. It shows the existence of nonisomorphic Kac–Moody groups with the same associated isomorphism class of buildings.     

Un revêtement de l'arbre de GL2 d'un corps local

Let F be a non-archimedean local field with residue class field k. Put G=GL₂(F), =PGL₂(k) and let X denote the Bruhat–Tits tree of G. We construct a one-dimensional simplicial complex , equipped with an action of G × and with a G × -equivariant simplicial projection (for the trivial action of on X). We prove that the cohomology with compact support contains nontrivial representations of G (in particular positive level supercuspidal representations).     

Bi-Lipschitz Embeddings of Trees into Euclidean Buildings

Let be the affine Bruhat-Tits (or Euclidean) building associated to a semisimple, simply connected linear algebraic group defined over a non-Archimedean local field. We prove that there exist locally finite trees of degree 3 which are bi-Lipschitz embedded in . As a consequence such a Euclidean building cannot be bi-Lipschitz embedded into a Hilbert space.     

An interactive model for the layout of buildings

The TOPAZ model and its derivatives, TOPLAY and TOPMET which have been developed for sketch planning design of buildings, are presented and their use is illustrated by application to a 40 000 m² insurance building. TOPMET introduces a completely new approach to solve the inherently difficult quadratic assignment layout problem. The new approach is relatively simple and readily adaptable to microcomputer usage in an interactive form using colour graphics. It also exhibits artificial intelligence behaviour and offers further development possibilities. The paper concludes that while the sketch planning phase of multi-storey building design has received relatively little attention from computer modellers to date, the use of models such as those described in conjunction with inexpensive colour graphic microcomputers is now set for extensive development and application.