兰州红楼时代广场模型结构振动台试验研究

兰州红楼时代广场是一幢扭转不规则、高度超限的超高层混合结构体系建筑,结构采用了带水平加强层的框架-核心筒抗侧力体系。通过1∶25缩尺模型振动台试验,对模型结构在8度设防、多遇和罕遇地震作用下的加速度反应、位移反应以及关键部位的动应变反应进行测试,发现结构的薄弱部位,评价该结构体系的整体抗震性能。研究结果表明：加强层会引起结构局部刚度、承载力突变,结构受力复杂化,并易形成薄弱部位,但通过调整伸臂桁架或者相邻层的刚度,可使加强层的不利影响降低到较小程度;模型结构在8度大震作用下仍不倒塌,证明该结构体系具有良好的抗震性能,可以用于高烈度抗震设防区。     

20t龙门起重机箱形支腿有限元分析

利用Pro/E和ANSYS软件,对起重量为20t、跨距为37.3m的龙门起重机的箱形变截面支腿进行了有限元分析和稳定性计算校核,确定的支腿结构,满足了强度及稳定性的设计要求。     

高层建筑中伸臂桁架的耗能性能研究

伸臂桁架是超高层结构中的关键构件,改善其耗能能力对提升结构的抗震性能具有重要意义。常见的伸臂桁架形式主要有普通支撑型伸臂桁架、屈曲约束支撑型(BRB)伸臂桁架和阻尼型伸臂桁架等。该文从框架-核心筒-伸臂桁架结构体系入手,对普通支撑型、屈曲约束支撑型和阻尼型伸臂桁架的受力性能和耗能性能进行了研究。结果表明,结构采用不同的伸臂桁架会对其在地震作用下的地震能量输入和耗能分布产生一定影响。和普通支撑桁架体系相比,屈曲约束支撑型和阻尼型伸臂桁架结构体系具有更好的耗能性能。此外,在对核心筒的损伤程度控制方面,阻尼型伸臂桁架的作用更加明显,而在整体结构的位移响应控制方面,BRB伸臂桁架的效果最好。     

汽车起重机H型活动支腿的设计与结构分析

本文对H型活动支腿的最大反力、刚度和常见的结构型式作了较详细的分析,同时,提供了H型活动支腿的设计计算方法。     

带加强层框架-芯筒结构设计的若干建议

提出了带加强层框架 -芯筒结构体系的合理的内力分析方法 ,给出了加强层的合理数量、最佳位置和刚臂的适宜刚度。基于结构主动控制的理念 ,提出了削弱刚臂端部抗弯能力的三种方法。     

网架修缮脚手架搭设实例两则

在空间网架维护施工中,如何设计施工脚手架是工程的关键。本文通过两例空间网架钢结构表面涂装工程的施工实践,简要介绍网架修缮脚手架的运用及搭设方法。     

A general solution for performance evaluation of a tall building with multiple damped and undamped outriggers

This paper presents a general solution for performance evaluation of a tall building with multiple damped and undamped outriggers. First, general rotational stiffness (GRS) is proposed to model an outrigger that consists of the stiffness of perimeter columns and an outrigger connection and the damping of dampers in an outrigger. By utilizing the dynamic stiffness method, the GRS can be represented by complex stiffness in an outrigger element. To analyze the dynamic characteristics of a tall building with multiple outriggers, a dynamic transcendental equation is obtained from the combination of the GRS and dynamic stiffness method. The structural responses can be calculated through the Fourier transform based on this equation. Moreover, the GRS can also be blended into a finite element (FE) model to generate an augmented state‐space equation for the analysis of the dynamic characteristics and structural responses. Applications to various outriggers are illustrated. In the numerical analysis, good agreements are found between the GRS and the FE that validates the proposed method, and the performances of various outrigger systems are evaluated parametrically. As the results of a tall building with multiple damped or undamped outriggers, the proposed method is capable of providing an optimally parametric design with respect to the position of outriggers, damping, and core‐to‐column and core‐to‐outrigger stiffness ratio. Copyright © 2015 John Wiley & Sons, Ltd.     

杭州黄龙饭店支腿式地下连续墙施工技术探讨

支腿式地下连续墙在杭州地区工程中首次运用。结合实际工程实践,就支腿式地下连续墙的技术要点进行介绍,通过跟踪分析实际施工过程,简单介绍整个工艺流程和确保支腿式地下连续墙的施工质量、保证地下室开挖深度及基坑安全性、稳定性的技术措施。展望支腿式地下连续墙推广应用前景。     

伸臂刚度对加强层设置位置的影响分析

根据伸臂结构的简化模型和伸臂与外框柱的变形协调条件,考虑伸臂的实际刚度,导出伸臂对核心墙的附加力矩,求得结构顶点侧移。对伸臂位置变化引起的侧移变化与内力突变进行了分析,结合工程分析结果对高层建筑加强层设计提出了一些参考意见。     

Seismic performance analysis of viscous damping outrigger in super high‐rise buildings

This paper introduces a seismic energy dissipation technology—viscous damping outrigger (VDO)—which is composed of outrigger truss and viscous damper. The viscous damper is set up vertically at the end of outrigger truss, which is an innovative and high‐efficiency arrangement. VDO can fully utilize the characteristic of structural lateral deformation of super high‐rise buildings to increase the efficiency of viscous dampers for enhancing structural security, improving seismic performance, and reducing construction expenditure. In this paper, working principle and seismic energy dissipating mechanism of VDO are explained firstly. Then, the influence of viscous damper parameters on energy dissipation efficiency is studied. Next, the optimal position of VDO in a super high‐rise building is analyzed in detail. Lastly, the application of VDO in structural seismic design of a super high‐rise building in China will be clearly verified based on their feasibility, economy, and safety.