Progressive collapse resisting capacity of tilted building structures

In this study, the progressive collapse resisting capacities of tilted buildings are evaluated on the basis of arbitrary column removal scenario. As analysis model structures both regular and tilted moment‐resisting frames, structures with outrigger trusses, and tubular/diagrid structures are designed, their progressive collapse resisting capacities are evaluated by nonlinear static and dynamic analyses. It turns out that the tilting of the structures requires increased steel tonnage due to the increased p‐delta effect. In addition in the tilted structures the plastic hinges are more widely distributed throughout the bays and stories when a column is removed from a side or a corner of the structures. With the analysis results, it is concluded that the tilted building structures, once they are properly designed to satisfy a given design code, may have at least an equivalent resisting capacity for progressive collapse caused by sudden loss of a column. Copyright © 2012 John Wiley & Sons, Ltd.     

巨型混合框架-核心筒结构的性能分析

巨型混合框架-核心筒结构是由巨型型钢混凝土框架、混凝土核心筒与伸臂桁架组成的一种具有多道抗震防线的超高层结构体系.为了有效地提高巨型混合框架-核心筒结构的抗侧刚度和内外筒之间的协同工作性能,可采取以下措施:增加巨型梁的刚度;增加伸臂桁架的刚度;增设巨型支撑.分析结果表明:设置跨越两个楼层的巨型梁或伸臂,或增设巨型支撑,...     

Influence of core width on the optimization analysis of the outrigger-braced structure

In this paper, the governing equations of the outrigger-braced structure are formulated by considering the influence of core-wall width. The axial forces in the columns are considered as unknowns and the compatibility of the column's axial deformation is considered in formulating the governing equations. Then, the governing equations for the optimum locations of outriggers are formulated by minimizing the top drift of central core wall. After that, the influence of core-wall width on the optimum outrigger locations, the drift-reduction efficiency and moment-reduction efficiency is investigated numerically. Some results are presented for the reference in the preliminary design of the outrigger-braced structures.     

消能伸臂体系减震性能的参数变异性影响分析

为研究结构参数变异性对消能伸臂体系减震性能的影响,推导了该体系的有限元振动方程,同时提出地震响应简化分析的"Maxwell型阻尼器计算法",并结合Gauss-Hermite降维算法分析了确定性激励、随机地震激励作用的参数变异影响情况.结果表明:Gauss-Hermite降维算法既能保证精度又能提高计算效率;确定性激励时...     

Self‐centering viscoelastic diagonal brace for the outrigger of supertall buildings: Development and experiment investigation

This paper aims to improve the seismic performance of outriggers within supertall buildings and eliminate the defects of obvious degradation of stiffness, low energy dissipation capacity, and large residual deformation after the buckling of traditional diagonal members by presenting a new type of outrigger. The traditional profiled steel diagonal member is replaced with a self‐centering viscoelastic diagonal brace (SC‐VEDB) in the proposed outrigger, providing enhanced energy dissipation and self‐centering capacity. The new SC‐VEDB is composed of the inner and outer steel tubes, viscoelastic materials, and prestressed tendons. Energy dissipation capacity is produced by the shear deformation of viscoelastic materials, whereas prestressed tendons provide the self‐centering capacity. The working mechanism of SC‐VEDB is first theoretically analyzed. Following this, two specimens with a length of 2.2 m were designed, fabricated, and tested under low cyclic reversed loadings within different frequencies and pretension forces. The results confirm that the hysteretic curve of SC‐VEDB has a typical flag shape, which imparts the stable stiffness, good energy dissipation, and self‐centering capacities. The activation force of SC‐VEDB is mainly determined by the initial pretension force, and the post‐activation stiffness predominantly depends on the stiffness of the prestressed tendons. Moreover, SC‐VEDB has better repairability, and the initial hysteretic behavior of the component can be quickly recovered by replacing the damaged prestressed tendons. A refined finite element model for SC‐VEDB is established to predict its hysteretic behavior, and the numerical simulation corresponds well with the experimental results. The maximum relative error of the initial elastic stiffness and ultimate strength is approximately 4.6% and 1.3%, respectively, which verifies the accuracy of the SC‐VEDB numerical simulation method.     

基于振动台试验的超高层结构伸臂消能体系抗倾覆性能研究

本研究通过对某超高层结构模型进行模拟地震振动台试验,考察核心筒、外围框架与伸臂结构组成的抗侧力体系在地震作用下的整体抗倾覆性能,重点分析在伸臂结构设置黏滞阻尼器的消能减震策略对结构底部弯矩的控制效果,为该类超高层结构体系减震研究提供参考。     

某重型起重机支腿锁故障诊断与改进

针对某重型起重机支腿锁的故障进行了测试与分析。测试结果表明,导致支腿油缸漏油以及油缸导向套密封件被损坏的主要原因是现有的支腿锁内部结构在某些工况下,会使支腿油缸的有杆腔产生高压甚至超高压。通过改进支腿锁内部的阀芯结构或者进出油阻尼孔径,可以有效地卸掉支腿油缸有杆腔的高压,进而有效地保护支腿油缸。     

石家庄跨京广铁路钢结构连续箱梁桥转体施工

介绍了石家庄和平路上跨京广铁路线高架两跨钢结构连续箱梁桥的结构形式、跨径布置,从桥梁转体转心位置的选择、转体方案设计和拼装位置布置等方面论述了钢结构连续箱梁转体桥的施工设计。介绍了转动体系的平转牵引系统、转体技术参数、增设临时辅助拉索、纵横向平衡重布置等施工关键问题。最后介绍了转体施工流程和施工阶段的数值模拟。     

大型项目中间的工程力学解决方案

近年来国内外大量大型复杂、“超限”的建筑结构相继建立,这些工程大多属于不规则结构,甚至是特别不规则结构,在对这类结构进行设计时,往往会遇到超过规程适用范围或者规程中未规定的问题。这些问题并不能套用现行标准,并缺少明确目标、依据和手段。该类问题往往需要以工程力学原理为基础,提出针对性的解决方案。该文针对奥雅纳工程咨询公司（ARUP）在国内一系列大型工程项目,对该类工程力学解决方案进行整理介绍。     

GKC8垂直升降高空作业车车架结构设计

阐述ＧＫＣ８高空作业车车架结构的设计过程，提出了一种改装汽车车架的简单可行的方法，为一种新系列高空作业车的开发奠定了基础。