【正文】 at is, not subject to extremes of expansion and contraction. MAINTENANCE CONSIDERATION Maintenance for curtain wall is a longterm consideration involving both the quality of design, control during construction and adequate maintenance throughout the life span. Once failure occurs in the curtain wall it will be very expensive to have the defects rectified and at the same time causing great disturbance to the building users. Below are some mon problem sources where failures usually occur. failure – selection and appropriateness of the system, nonpliance to design and performance standards, imperfection in the jointing design and detailing, improper use of materials etc. and structural failure – wrong location or method of fixing, improper anchorage and connection provision (including failure in welding), failure in the walling ponents, unpredicted deflection or deformation appears in the background structure, poor supervision and workmanship. and deterioration – discolouring and surface damaging due to weather action。 corrosion due to air pollution, acid rain, or electrochemical effect to dissimilar metals。 aging and hardening of the glazing pound or sealing gasket, deteriorating of the insulating materials that lead to further dampening of the walling materials/ponents, disfiguring or loosening of the fixing and connections, loosening or brokenoff of the glazing or other fitting items. Curtain wall systems should be inspected regularly after they have been installed in buildings. Proper maintenance and repair are essential to keep them in a safe condition. Inspection arrangement should be made in particularly before and after typhoons. The below signs are remended to observe closely during each inspection. Sign of distress and deterioration of the entire wall system, cracked, loose or missing glass panels, bulging, bowing, separation, delamination, rotation, displacement of panels, marks of water, staining and rust, damaged and missing parts, corrosion, loosening or other defects, extrusion, wrinkle, split, missing or other signs of deterioration of the sealing materials. moisture appears around or behind the curtain wall. CONCLUSION The application of curtain wall systems in superhighrise buildings is a big topic. Within the scope of this paper it can only cover a very little of the key issues. Having witnessed the evolution of using curtain wall in Hong Kong for the past 2 to 3 decades, a general trend, as summarized below, can be observed. Starting from lowcost, localdesign and manufactured walling products in the early systems to the imported, deluxe, tailordesigned proprietary systems in recent years. Starting from simple requirements fulfilling just very basic functional needs of buildings to very specialized products or systems that can meet any stringent requirements as set by designer, engineers or environmental experts. The old systems were mainly stick systems due to more simple in design and production. Though labourintensive, the relatively much cheaper labour cost at that time still made it worked acceptably. Contemporary systems are using mainly unit systems that make installation very easy and labour saving, though the design quality and coordination with other building activities are much more demanding. The old systems that have been used in the first and second generations often inherited with quite a lot of design imperfections and latent defects。 while new systems are more reliable, some can be regarded as almost maintenancefree. Traditional external walling methods using appliedonto products such as tile or sprayon coating are still dominating in Hong Kong. However, it is notable that the use of curtain wall is gaining its popularity quite rapidly among designers and developers due to its unreplaceable attractiveness as well as slim and fashionable appearance. Further development and improvement in the use of curtain wall systems is an ongoing process in Hong Kong. The areas of improvement may be aiming at the development of more specific functioned, more reliable and longlife systems. Such targets may be achieved by the use of more advanced glass products, sealing pounds, gaskets or in the development of more sophisticated connecting systems。 as well as the introduction of other additional functions that curtain wall may take up like the incorporation of photocell onto panels of wall, the providing of automatic/robotic machine in the system for external wall cleansing, or curtain wall capable to perform light show at night. Meanwhile, the continual improvement of workmanship and refinement of work detailing in particular to the areas directly in touch with the building structure or other building finishes, is a prime concern to the ensurance of a good curtain wall system, that sometimes project executives may easily overlooked. 中文譯文： 超高層建筑幕墻系統(tǒng)的結(jié)構(gòu)與性能 香港城市大學(xué)，建筑科學(xué)與技術(shù)部 Raymond WM Wong 引言 幾十年來超高層建筑的建設(shè)在香港一直非?；钴S 。 比如近期著名項目 50 層高的宏利 大廈， 62 層高的長江集團(tuán)中心， 80 層高的 “ 中心 ” 大廈，有 88 層高的國際金融中心，以及最近的一些超過 60 層樓高的住宅 ， 這些項目無一例外都是采用幕墻作為他們的外部 圍護(hù)結(jié)構(gòu)。 高 層 建筑 如 何采 用 薄壁外部圍護(hù) 結(jié) 構(gòu)一 直 是一 個 挑戰(zhàn) 設(shè) 計師 和 建筑工的難題 ， 特別 是在成本、能源、水密性、安裝性、尺寸方面、結(jié)構(gòu)的穩(wěn)定性、與其它建筑構(gòu)件接口的 搭配、維修等方面。筆者想利用香港的經(jīng)驗(yàn)，來介紹一些當(dāng)?shù)乇”谀粔ο到y(tǒng)設(shè)計和安裝 的實(shí)踐和總結(jié)。 使用幕墻的香港建筑 自 1970 年始香港經(jīng)濟(jì)騰飛由傳統(tǒng)的