大跨径索吊桥的振动测试、信号处理及TMD减振方法

由于大跨径索吊桥的轻、柔、低阻尼的特点，桥梁的风振问题成了结构设计及施工过程中所关注的热点。本文讨论了大跨径索吊桥的振动信号的特点及信号采集与处理的方法，以广东虎门大桥作为研究对象．过行了桥梁动态特性试验，安装与不安装TMD的抑振对比试验．并分析了TMD的抑振效果。

吊桥索夹——模拟仿真建模计算

悬索吊桥和张力索桁吊桥主索在吊杆巨大重力作用下,索夹对钢丝之间内力的挤压、传递、分布和变形情况复杂。索夹内主索上下部要失圆变形成为异形椭圆形断面,索夹内弧应该是椭圆形,索夹外圆形主索对异形椭圆形索夹具有抗滑作用。索夹按异型椭圆形设计,设计计算有困难,故索夹常简化为圆形。采用实用工程数值模拟“仿真”建模,作网状平面饺接刚架“仿真”建模计算,是简单实用的计算方法,使复杂计算问题获得简单解决。

泸州旅游胜地九狮山

拥有5000多亩森林的九狮风景区,群山环抱,风光秀丽,是泸州地区的旅游胜地。该风景区在原有自然景观和人文景观的基础上,新建成一批起点高、规模大、文化内涵丰富的游乐点:石刻汉阙艺术大门,150亩碧波荡漾的醒狮湖,别具一格的水上娱乐城——船舫宾馆,数10艘游艇,横跨醒狮湖的148米铁索吊桥,具有傣族风情的清风亭竹楼茶园,以及规模宏大的1000米仿长城等等。

Taizhou Yangtze River Bridge——The first kilometer level three-pylon two-span suspension bridge in the world

Taizhou Bridge, located at the middle of Jiangsu Province, connecting Taizhou City and Zhenjiang City, started in Dec. 2007. The bridge is the first kilometer level three-pylon suspension bridge in the world, and it adopts longitudinal herringbone shape steel middle pylon for the first time in the world. The foundation of the middle tower is the deepest underwater caisson in soil on earth. A great many of technical innovations such as the design techniques of three-pylon suspension bridge,precisely locating and bottom-sealing techniques of the large scale caisson foundation, manufacturing, combination techniques of steel and concrete in the middle tower, welding of extra thick steel plate, manufacture and control techniques of abnormal sections of the middle tower and so on were introduced.

Line-shape calculation method for suspension bridge catwalk considering different states of bearing cables

The line-shape of catwalk of long-span suspension bridge is obtained by using the segmental catenary method to carry out the iterative calculation, where all the bearing cables are considered as one cable, and transversal passages and gantry are treated as nodes which divide the catwalk into several segments. The difference of line-shape and force between catwalk bearing cable and gantry bearing cable is not usually considered, but the line-shape of two kinds of cables is actually inconsistent because of the constraints from gantries. Based on the segmental catenary method, considering the different states of bearing cables （ DSB calculation method）, fine calculation is carried out. This method is applied to the design of a suspension bridge＇ s catwalk, and is compared with the traditional calculation method. It is obtained that the result is more reasonable and accurate by the coordination calculation method considering different states for two kinds of load-bearing cables, which is worth considering in the nrocess of design and optimization for catwalk.

Research on the stiffening girder erection sequence of three-tower suspension bridge

Compared to the conventional two-tower suspension bridge, the three-tower suspension bridge has obviously different characteristics in structural performance because of the extra middle tower and main span. The construction sequence for the stiffening girder is significantly different between the three-tower suspension bridge and the two-tower suspension bridge. The tangential angle of the main cable is one of the controlling factors of the stiffening girder erection stage for a suspension bridge. According to 5 feasible cases for the stiffening girder erection scheme in Taizhou Bridge, the research about the tangential angle in each case mentioned above was made, and some factors that should be taken into account for the erection scheme of stiffening girder were pointed out.

永平有佳景

霁虹桥据史料记载,汉武帝时,由官家操办,民众出力,在兰津古渡上修建起了一座桥,可惜是很简易的竹木软桥。兰津桥再次修葺,是明成化十一年,即公元1475年,由竹木软桥更新为铁索吊桥,并改名为"霁虹桥"。霁虹桥巍峨雄壮,全长106米,宽3.7米,由18根铁索组成,铁索两端固定在澜沧江两岸的峭壁上,横跨于云南永平县西部杉阳镇岩洞村和保山市水寨乡平坡村之间的澜沧江上。此桥是博南古道上的重要桥梁,也是我国最早的铁索桥,有"西南第一桥"之誉,在桥梁史、文化史等诸多方面,

深谷幽涧陶唐峪

在霍山的青山翠岭中,隐藏着一个清幽秀美的去处,名叫“陶唐峪”。陶唐峪位于霍州市城东15公里处。史称陶唐谷,因尧帝曾于此立宫避暑而得名。其谷中景观由于处于初期开发阶段。

择日再死

阳光穿过树荫斑驳地洒在周身的每处,心里暖暖的,身上懒懒的,我醉酒一样地躺在悬崖下暄软的青草地上。 望着崖壁上一个个古怪的悬棺,心里在嘀咕,也不知道崖上作古的前辈是怎样过去的。但我想他们一定都死过两次,最后一次一定和我现在一样,是醉死在这片美景前的。一阵风吹来,我咬咬牙翻了个身,没有音乐实在是件憾事。此时,我能听到溪流在周围流淌,还有穿梭林间的风留下的痕迹。