板梁桥

Through referring related documents and analysis of builded bridges home and abroad, this dissertation makes anslysis on design of whole bridge on the basis of design theory for general box-girder, and combined with the design of Long-March bridge. There makes a special research on shear connecter which connecte corrugated steel webs with concrete board up and down. Design method of shear connecter is discussed.

本文在参阅国内外有关文献及实桥资料的分析，以普通混凝土箱形梁设计理论为基础，结合长征桥的设计，分析了整个桥梁的设计过程，尤其对波形钢腹板和顶底板混凝土的剪力连接件进行了研究，给出了计算方法。

Based on the theoretical and testing reseaches on the concrete anticrack property of the Qi-Nen-Bridage box beam web under the partical partical of the prestressing large tonage anchorage, this paper points out that the concrete crack resistance of the web does not meet the code.

本文对齐嫩桥连续预应力混凝土箱梁腹板在大吨位锚头作用下的混凝土局部承压抗裂性的设计进行试验研究、验证工作，指出了腹板在锚下混凝土局压抗裂性能与理论分析的一致性，证明了原设计的抗裂度不能满足规范要求，为保证工程的可靠性提供了修改设计的依据

To liberation, the two piers cracks have occurred, endangering the bridge itself, has had to limit heavy vehicles crossing the bridge, speed limits, limit the number. 1954, the local spent six months repaired the crack of the pier, in the original steel trusses on the level of amputation and a curved shape of the upper limbs, using reinforced concrete bridge deck boards, so that the bridge deck beam into a combination of vertical and horizontal beams, Increase the carrying capacity of 20 tons of cars can have full. 1981, the upper reaches of the Yellow River Bridge has withstood the test of catastrophic flood, safe and sound.

到解放时，两个桥墩已发生裂缝，危及大桥本身，不得不对过桥车辆限重、限速、限数。1954年，当地用了半年时间修好了开裂的桥墩，在原来钢桁架的水平肢上加了一根弯曲形的上肢，桥面改用钢筋混凝土板，使桥面的纵横梁变为组合梁，提高了承载能力，20吨重的汽车可以畅行无阻。1981年，大桥经受了黄河上游特大洪水的考验，安然无恙。

The serial mould consists of the flexible and portable gearshift operation system; The mechanism of door lock easy to open; The powerful and strong high-quality motive force; The rear axle with five-and-six-shelf float, all float, mechanical brake and oil brake; The front shock attenuation device with changeable rigidity; The double longerons, the rectangle frame and the widened leaf spring.

该系列车型设有灵活轻便的换挡操作系统，开启自如的汽车门锁定机构，强劲有力的名优动力，五、六档半浮、全浮、机刹、油刹等后桥；变刚度前减震装置；双纵梁加矩形管车架及加宽板簧，使车辆行驶更平稳，承载能力更强劲，驻车安全性能更可靠。

Superstructure design, first determine the type of bridge, structural design, the choice of beam layout and positioning, the bridge is used in assembly-prestressed concrete simple hollow plate girder bridge, followed has been set in accordance with the structural design and calculation with Tendons.

上部结构设计中，首先确定桥的类型，构造的设计，梁板布置的选择和定位，本桥采用的是装配式预应力混凝土简支空心板梁桥，其次根据已定的结构设计和计算配筋。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。