声发射测量原岩应力研究现状及进展

综述了声发射测量原岩应力的国内外研究现状和目前所存在的主要问题，结合信号处理小波分析方法的研究成果，说明了将小波分析引入到原岩应力测量的重要性，最后提出了基于小波分析的综合研究方法作为声发射测量原岩应力的进一步研究方向。     

高炉矿渣微粉在极端环境下的应用研究

对高炉矿渣微粉(GGBS)混凝土在海岸、撒盐道路及污染严重的工业区等极端环境中的氯盐渗析、碳化、耐蚀性等耐久性能进行了研究,在海水环境中矿粉混凝土有较好的抗蚀性,比相同强度等级的普通水泥混凝土有更好的抵抗海水侵蚀的能力.这种特性增加了混凝土的耐久性,通过对电位、氯化物、抗蚀性的测试也证明以上观点.通过对在海水环境下相同强度等级混凝土试块的测试可知,掺矿粉70%的混凝土抗氯盐侵蚀的能力要远好于普通水泥混凝土.海边的暴露环境对混凝土影响最大,其次是道路环境和工业区环境.     

留在历史记忆中的千年古镇——新滩镇

走过三峡大坝,进入长江西陵峡腹地的兵书宝剑峡与牛肝马肺峡之间,在长江北岸一片乱石坡上矗立的“长江新滩滑坡遗址”八个巨大字牌立即跃入过往游人的眼帘,这里就是1985年6月12日发生的震惊中外的新滩滑坡遗址。新滩,又名青滩,由于水上有滩,陆上有镇,所以滩名和地名都叫新滩,这里群山逼水,乱石横亘,滩险水急,航道狭窄,是长江著名的险段。范成大的《吴船录》中记载:“新滩,旧名豪三峡。汉、晋时山再崩塞,故名新滩”。镇治以晋太元二年计,距今已有1600多年的历史,北宋设新安驿于此;南宋末年,州治曾迁往新滩南岸,因“峡中地无平旷,新滩决不可城”而迅速东迁;明设新滩镇;清设北岸乡,并设后司把总署和新滩巡检司于此;民国时期曾更名为新安镇、南岸乡、北岸乡、屈平乡。据《归州志》记载,2000年前此处“始平坦,无大滩”;东汉永元十二年(公元100年)第一次崩山,“闰四月戊辰,秭归新滩山崩,压百余人”,后又崩山数次;北宋天圣年间,“新滩山崩,石壅江心,航道阻塞,害舟不计其数”;明嘉靖二十一年,新滩北岸山崩五里许,巨石腾壅,闭塞江流,压民舍百余家。连续山崩在新滩段形成了一道滩礁密布、怪石丛生数百米长的险滩恶水。在长江葛州坝水利枢纽工程截流...     

新

记得参观一所学院的建筑教室，学生问我，我们的设计是否很“新”，我愣了一下，怎么回答？真是难以答复。     

思辨

做学生时，杨廷宝老师给我们改图时总是说：这样也可以，那样也可以……不说死，我们年轻人的心里总嘀咕着，不得其解。到了年老了，自己经过了许多工程设计的锻炼，自身的社会生活阅历增长，再想老师的话，有道理，这是一种“思辨”，也是从朴素的辩证观点来看学生的各种方案。     

Modification of -equation in the SSRC Guide for buckling of monosymmetric I-beams under transverse loads

Finite element buckling analyses of monosymmetric I-beams subjected to transverse loading applied at different heights with respect to the mid-height of the cross-section were conducted. Transverse loads consisting of a mid-span point load and a uniformly distributed load were considered in the investigation. Four types of end restraint also were considered. The method suggested in SSRC Guide was compared with the finite element method (FEM) results. In order for C-equation in the SSRC Guide to be applicable for monosymmetric I-beams, it must be modified to contain three variables; A_m, B_m, and D_m. The first two variables A_m and B_m are modified variables A and B in the SSRC Guide whereas the third variable, D_m, developed herein, is the new modification factor for monosymmetric I-beams. The applicability of this new design rule is limited to monosymmetric I-beams in which the degree of monosymmetry, ρ, is within the range from 0.1 to 0.9.     

Hendrick Petrus Berlage's villas

Hendrick Berlage is known to architectural history mainly for his Amsterdam Stock Exchange of 1903. This is often celebrated as a proto-modernist work in a rationalist spirit, an oversimplified view, for the building had a conventionally eclectic start and was the fruit of long struggle and many revisions. The development of Berlage's architectural ideas during the period of its gestation is chronicled in a fascinating way by a series of private villas built for friends who were artists and intellectuals. Completed year by year, they run right through the 1890s, showing Berlage's changing concerns with the articulation of content, the expression of construction, the application of controlling geometry, and the development of architectural space.     

国家的门脸儿——南非使领馆设计

国家强大了!国人有钱了!经过30年的快速发展,中国在世界的地位发生了巨大的变化,中国人在外国人面前腰杆也挺起来了.然而在人们对中国经济的飞跃发展充满好奇和羡慕的同时,也对中国人处事态度的变化产生疑虑和担心.外交使团代表着国家的风范,使领馆建筑也代表着国家的形象.因此,设计使领馆建筑多少担负着表达中国精神和传递文化品味的重任.9年前我们有幸承担了中国驻南非使领馆的设计工作,在创作中得到外交部和使馆各级领导的大力支持,他们彬彬有礼的作风、既相互尊重又坚持原则的办事态度以及对国际文化交流的设想,给了我们很大的启发和激励,使我们明确了尊重环境、和谐内敛、追求精致典雅文化气质的创作思路,设计工作由此顺利展开.     

Lyapunov exponent of friction-induced vibration under smooth friction curve

This paper studies the nonlinear behavior of the friction-induced vibration by using spring-mass model subject to the smooth frictionvelocity curve. The nonlinearity and instability of the friction may produce the chaotic vibration depending on the friction curve. In order to show this, the Lyapunov exponents are calculated for a variety of the slope and magnitude in the smooth friction curve. In turn, the dependency of the friction curve on the chaotic attractor is illustrated.