斧子口水利枢纽大坝基础处理

介绍了桂林市斧子口水利枢纽的工程概况及坝址的工程地质情况,根据大坝基础地质条件,提出了斧子口水利枢纽大坝基础处理的目的和要求,论述了大坝基础的处理方案。     

改革开放30年:中国跻身世界建筑铝材大强国

在改革开放30年内,仅经过25年中国就成为世界建筑铝材大国与强国,当然大国是毫无疑义的,但还不是一个真正意义上的强国,因为自主创新的研发力量还不强,基础理论研究还相当薄弱,在模具材料、设计与制造方面要赶上美、德、日等国方面还有一段较长的路要走,所以只能说已跨过挤压铝材强国的门槛.     

刚性、柔性钢结构组合体系在建筑幕墙中的应用

近年来,建筑幕墙被广泛地应用于公共建筑。幕墙支承体系各式各样,其中,刚性、柔性钢结构组合体系以其独特的特点受到建筑业人士的青睐。结合两个工程实例,阐述了该体系的应用特点。     

Eisen‐ und Stahlhochbauten der Industriearchitektur in den Vereinigten Staaten von Amerika im ersten Drittel des 20. Jahrhunderts

Industrial architecture in the United States of America during the first third of the 20th century. At the turning of the 20th century the American Industrial Architecture assumed a leading role worldwide with new construction methods and new materials. The standardization of building processes and new methods of prefabrication accelerated the reduction of construction‐time and promoted an efficiency in the design of factories.     

Drift demand of the outer‐skin curtain wall system of the Shanghai Tower

As a drift‐sensitive nonstructural component, the in‐plane deformation ability of the curtain wall (CW) in a tall building is critical to the seismic performance. The immediate earthquake excitation of the CW system is the floor response where the CW is located. To evaluate the drift demand of the outer‐skin CW system of the Shanghai Tower, floor responses of the reinforced stories of each vertical zone are analyzed. Drift demands, including the interzone drift ratio (IDR) and interzone drift response spectrum (IDRS), are obtained to define the engineering demand parameters related to the in‐plane relative displacement of the CW system. The results show that the 3‐dimensional ground motion (GM) excitations generate larger heightwise IDR distribution profiles and larger IDRSs than the 1‐dimensional GMs. The obtained IDR demands are shown to be 1/250, 1/150, and 1/100 for 3 key earthquake intensity levels. These values are different from those given by the current code provisions of China and other countries. The IDR distribution profiles of each vertical zone increase with height. The mean IDRSs of all 8 main vertical zones under selected GM excitations are determined as the representative drift spectra for each earthquake intensity level. Based on these mean spectra, simplified bilinear drift spectra are constructed for seismic design and analysis of the outer‐skin CW system of the Shanghai Tower.     

Acceleration demand of the outer‐skin curtain wall system of the Shanghai Tower

The unique complexities of the outer‐skin curtain wall (CW) system of the Shanghai Tower increase the difficulty in evaluating its seismic performance. To assess such seismic performance, it is important to understand the floor acceleration demand under expected earthquake actions. Acceleration demand of the CW system consists of floor acceleration amplification (FAA) and floor response spectrum (FRS), which are closely related to the equivalent static seismic design force and the dynamic properties of the CW system. For estimating the FAA and FRS, code spectra compatible ground motions are selected and input to a finite element model of the building structure. The floor responses of key stories are analyzed. Normalized distribution of the horizontal FAA demand is estimated and shows that the obtained values exceed those proposed by current code provisions for low‐intensity earthquake excitations. It is noted that the vertical FAA demand has a different distribution profile than the horizontal one. The results indicate that FAA demand under three‐dimensional earthquake excitation is larger than that for 1D excitation. Moreover, the prime period range is up to 4.0 s for the horizontal FRS and up to 1.0 s for the vertical FRS. Horizontal and vertical FRS is proposed for dynamic analysis of the outer‐skin CW system of the Shanghai Tower.     

预应力索桁架点支式玻璃幕墙技术

预应力索桁架点支式玻璃幕墙是目前最先进的一种新型幕墙结构,改变了传统建筑的表现形式,通过建筑内外空间结构的有效融合,集建筑、功能、美观、实用等于一体,提高整体承载力,加大空间结构,造型美观富有时代感和生命力。     

白鹤滩水电站地下厂房层间错动带渗流控制措施研究

白鹤滩水电站地下厂房洞室群规模巨大,层间错动带C2贯穿左岸地下厂区整个防渗线路,由于其性状差、透水性强、允许渗透比降小,是左岸厂区主要渗漏通道,因此,提高C2的防渗能力和渗透稳定性,防止形成集中渗漏通道,对左岸厂区防渗体系至关重要。为此,采取截渗洞、系统帷幕灌浆和排水孔幕相组合的防渗排水工程措施,通过三维渗流场有限元计算及帷幕灌浆试验对防渗效果进行分析。结果表明:截渗洞和帷幕灌浆能有效截断渗漏通道,排水孔幕排水降压效果显著,C2渗透系数的变化对地下厂区上游侧渗流场影响不大; C2影响孔段可灌性好,灌后能够满足透水率小于1 Lu的工程防渗要求; C2渗流控制措施总体合理有效,但是排水孔揭穿C2部位渗透比降较大,最大可达7. 0,蓄水初期应重点关注,避免发生渗透变形。     

水利水电工程中防渗帷幕布置原则与方法

系统总结了水利水电工程防渗帷幕布置的主要原则与方法,重点强调了水文地质条件的决定性作用及服从主体建筑物的要求。以彭水水电站防渗帷幕布置为例,介绍了防渗帷幕布置原则与方法的具体应用。     

《混凝土大坝安全监测技术规范》的修订建议

混凝土大坝定期检查和运行实践表明，坝基析出物分析、低水位时的巡视检查和帷幕前扬压力的观测，对保证大坝安全具有重要意义。文章建议《混凝土大坝安全监测技术规范》修订时，作适当修改补充。