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。     

高层建筑中悬臂钢桁架的分析与设计

主要分析了某综合开发区主塔楼悬臂钢桁架的传力机理及其对结构抗侧移刚度的影响;探讨了钢与混凝土共同作用的悬臂钢桁架核心筒加强区的分析和设计方法。分析表明,钢悬臂的刚度与传入边柱的轴力存在渐进曲线关系;同时,悬臂钢桁架在考虑了核心筒加强区钢构件与混凝土共同作用后,由于合理利用了混凝土的刚度和混凝土对钢构件的握裹作用,可节省埋入核心筒加强区的钢用量,其分析与设计方法是值得借鉴的。     

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。     

上海陆家嘴金融贸易区X2地块南北塔楼结构设计与研究

上海陆家嘴金融贸易区X2地块南、北塔楼高度分别为250m和260m,采用巨型框架-核心筒结构体系,属于超限超高层建筑。根据结构体系和特点,针对核心筒的重要性、转角桁架的设置、楼面梁板的布置等阐述了设计思路。通过对比分析设置与不设置伸臂桁架时地震作用引起的弯矩及剪力在核心筒和外框架之间的分配关系,指出只要将伸臂桁架的刚度控制在合理的范围,既可有效改善核心筒的受力,又不至于导致过度的刚度突变。静力弹塑性分析给出了塑性铰的发展过程,表明结构各道抗震防线性能良好,能保持有效的协同工作。振动台试验表明结构总体上满足现行规范7度抗震设防的要求,根据8度罕遇地震下结构出现的局部破坏情况给出了设计建议。研究结果表明,南、北塔楼结构体系合理,具有良好的抗震性能。     

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。     

Parameter study of framed‐tube structures with outriggers using genetic algorithm

In this paper, the analysis of optimal locations of framed‐tube structures with outriggers is conducted with the uniform and nonuniform core and peripheral columns using genetic algorithm, aiming to minimize the interstory drift. Also, comparison and difference of the results between the uniform and nonuniform structures are carried out and discussed. Besides, several parameters which influence the behavior of the structure are identified and analyzed, such as different objective functions, segments of outriggers, thickness of core wall, stiffness of outriggers, and grade of concrete strength. In addition, a Matlab program is written to perform the parameter analysis of optimal location of outriggers. Take a 260‐m high‐rise building as a target building, the optimal locations of one to two sets of outriggers subjected to three kinds of horizontal loadings (uniform, parabolic, and triangular) are obtained and can be utilized for the structural preliminary design of tall buildings.     

Optimal vertical configuration of combined energy dissipation outriggers

The damped outrigger system emerged as an improvement of the conventional outriggers with the aim to provide supplemental damping and to contribute to the vibration control in super tall buildings where this system is usually applied. In addition to viscous dampers (VDs), buckling‐restrained braces (BRBs) have also been employed as energy dissipating members in outriggers. Nevertheless, the combined use of outriggers with VDs and BRBs in the same structure has not yet been studied. Such combination can contribute to achieve an effective multiperformance design of super tall buildings. This paper presents a study whose main objective was to determine the optimal vertical combination of two types of energy dissipation outriggers to control the seismic responses of a 9‐zone super tall model structure. Outriggers with VDs (OVDs) and outriggers with BRBs (OBRBs) were placed at the different zones of the structure considering all the possible combinations and in configurations of up to four outriggers. The effects of these combinations on the seismic performance of the structure were studied through parametric analysis and optimization methods. This form of the outrigger system is defined in this paper as combined energy dissipation outrigger system. The results indicate that when two energy dissipation outriggers are used, the combination of OBRB plus OVD shows superior seismic performance compared with other double‐outrigger configurations. In addition, the results show that the locations of OVDs and OBRBs play an important role in the structure behavior; it was found that it is more beneficial to place OBRBs above OVDs.     

GYL-200型塔架履带一体式钻机的研制

为提高钻机搬迁的方便性,简化竖塔过程,提高施工效率,研制了一种将后移式工勘钻机置于橡胶履带底盘上,并设计了液压起降折叠开放式三角钻塔的塔架履带一体式钻机。同时为不影响钻机原有的斜孔钻进功能,钻机底架设计为旋转支腿结构;为进一步提高钻机的自动化程度,将原手动式卡盘改为液压卡盘。介绍了该塔架履带一体式钻机的结构以及部分参数选择计算。