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。     

上海环球金融中心结构简化弹塑性时程分析及试验验证

鉴于上海环球金融中心结构体系及结构布置的复杂、结构高度及体型的超限,为了确保该建筑结构的抗震安全性和可靠性,除进行常规的计算分析外,还应对该结构进行弹塑性时程分析。本文建立了该结构的弹塑性时程分析简化模型,并编制了相应的计算程序。为了检验结构弹塑性时程分析的可靠性,首先对振动台试验的模型结构进行弹塑性时程分析,以便和试验数据进行对比。在此基础上对原型结构进行弹塑性时程分析,并对该结构进行了抗震性能评价。     

Development of a novel sacrificial-energy dissipation outrigger system for tall buildings

The frame-core tube-outrigger structural system is widely used in tall buildings, in which outriggers coordinate the deformation between the core tube and the moment frame, leading to a larger structural lateral stiffness. Existing studies indicate that outriggers can be designed as “fuses” of tall buildings through dissipating seismic energy after yielding, to protect the main structure. To date, both conventional and buckling-restrained brace (BRB) outriggers have been applied in practice. Subjected to the maximum considered earthquake (MCE), the hardening effect of BRB outriggers increases the damage of other structural components. Meanwhile, conventional outriggers are difficult to repair, owing to the local buckling-induced severe deterioration and damage. To overcome these problems, this study proposes a novel sacrificial-energy dissipation outrigger (SEDO) to improve the seismic resilience of tall buildings. The chords of SEDO are made of high-strength steel and remain elastic. The inclined braces of the SEDO are composed of a sacrificial part and an energy-dissipating part. Therefore, the SEDO remains elastic under design-based earthquakes (DBEs) and dissipates inelastic energy under MCEs. Moreover, the detailing of this novel SEDO is proposed on the basis of experimental studies. The optimal strength ratio between the sacrificial part and the energy-dissipating part is determined in the range of 6:4 to 4:6 on the basis of nonlinear time history analyses (THAs) and parametric studies. Afterwards, the SEDOs are used in an actual tall building to verify their seismic performances through nonlinear THAs. The results indicate the proposed SEDO is able to protect other structural components and effectively improve the seismic resilience of tall buildings.     

高层建筑结构中粘滞阻尼器的新型安装方式

在建筑结构中,一般粘滞阻尼器均布置在层间,但在有些情况下较小的层间位移差在一定程度上制约了阻尼器性能的充分发挥。系统回顾了为解决这一问题,目前最新的一些解决方案:改进层间阻尼器的连接方式,如基于连杆结构、杠杆原理与齿轮机构的位移放大系统,及大对角支撑;新型结构保护系统,如利用结构构件竖向振动位移及框架核心筒结构的加强层阻尼系统等,并重点分析了加强层阻尼系统。     

Seismic performance evaluation of single damped‐outrigger system incorporating buckling‐restrained braces

The outrigger system is an effective means of controlling the seismic response of core‐tube type tall buildings by mobilizing the axial stiffness of the perimeter columns. This study investigates the damped‐outrigger, incorporating the buckling‐restrained brace (BRB) as energy dissipation device (BRB‐outrigger system). The building's seismic responses are expected to be effectively reduced because of the high BRB elastic stiffness during minor earthquakes and through the stable energy dissipation mechanism of the BRB during large earthquakes. The seismic behavior of the BRB‐outrigger system was investigated by performing a spectral analysis considering the equivalent damping to incorporate the effects of BRB inelastic deformation. Nonlinear response history analyses were performed to verify the spectral analysis results. The analytical models with building heights of 64, 128, and 256 m were utilized to investigate the optimal outrigger elevation and the relationships between the outrigger truss flexural stiffness, BRB axial stiffness, and perimeter column axial stiffness to achieve the minimum roof drift and acceleration responses. The method of determining the BRB yield deformation and its effect on overall seismic performance were also investigated. The study concludes with a design recommendation for the single BRB‐outrigger system.     

超高层巨型结构振动特性研究

巨型结构体系是适应超高层建筑发展趋势和特点的新型结构体系，目前国内外的理论研究成果还很少。随着工程应用的推广，进行巨型结构体系的研究，有其重要的理论价值和实际意义。结合101层上海环球金融中心大厦具体工程，进行了整体结构的振动台试验，并利用国际通用有限元软件ANSYS分析了超高层巨型结构体系的动力特性和影响因素，可供工程设计人员在结构选型和方案设计时参考。     

Dynamic characteristics of a novel damped outrigger system

This paper presents exact analytical solutions for a novel damped outrigger system, in which viscous dampers are vertically installed between perimeter columns and the core of a high-rise building. An improved analytical model is developed by modeling the effect of the damped outrigger as a general rotational spring acting on a Bernoulli-Euler beam. The equivalent rotational spring stiffness incorporating the combined effects of dampers and axial stiffness of perimeter columns is derived. The dynamic stiffness method(DSM) is applied to formulate the governing equation of the damped outrigger system. The accuracy and effi ciency are verifi ed in comparison with those obtained from compatibility equations and boundary equations. Parametric analysis of three non-dimensional factors is conducted to evaluate the infl uences of various factors, such as the stiffness ratio of the core to the beam, position of the damped outrigger, and the installed damping coeffi cient. Results show that the modal damping ratio is signifi cantly infl uenced by the stiffness ratio of the core to the column, and is more sensitive to damping than the position of the damped outrigger. The proposed analytical model in combination with DSM can be extended to the study of structures with more outriggers.     

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。