板梁桥

Analyse the distributive law of shear-lag effect and influence of each structural parameter: pile length , bending stiffness of pile, bending stiffness of abutment, abutment length, different type of soil behind abutment, curve radius, width to span ratio,width of beam, etc. And the main influencing parameters were picked up.

进行结构参数分析，研究等代桩长、桩的纵向抗弯刚度、桥台纵向抗弯刚度、桥台高度、台后土压力、曲率半径、宽跨比及箱梁肋板间距等对剪滞系数的影响，从而得到影响无伸缩缝曲线箱梁桥剪力滞效应的主要参数和次要参数。

Based on the grillage simulation, the curved girder is analyzed in this paper. Through the comparison between the same height web plate and the different height web plate, the applied domain of each kind of cross section is given.

采用梁格法对曲线箱梁桥的受力特点进行分析和阐述，并对等高腹板和不等高腹板两种截面形式的优劣进行比较，得出了两种截面形式各自的适用范围。

Analysis had been carried out on the models of representative deck thickness and hinge joint depth with centre load and side load applied.

分析结果表明，随着桥面板厚度的增加，板梁挠度及板梁底横向拉应力逐渐减小，铰缝内的横向拉应力和竖向剪应力逐渐减小；随着铰缝深度的加大，各板梁挠度差逐渐减小，板梁底横向拉应力逐渐增大，铰缝内的横向拉应力和竖向剪应力逐渐减小；并且随着桥面板厚度的增加，铰缝深度对板梁桥的刚度及受力性能的影响效果逐渐降低。

The results show that, with the same steel consumption, the longitudinal and transverse girder deck scheme is a little better in stiffness, dynamic characteristics and stability than those of the other scheme's. For the dense transverse girder deck scheme, because of no longitudinal beams, the axial forces of the tie beam and the deck slab are higher than those of the other scheme's. The improving rate of the axial force for the deck slab is about 50%. The inside and outside bending moments of the cross beams reduce to below half of the other scheme's. The longitudinal stress of the deck slab is higher on the whole and the traverse stress is less than that of the other scheme's. The maximum traverse stress of the deck slab is below 40% of the other scheme's.

研究结果表明：在材料用量相同时，纵横梁方案桥梁刚度较密布横梁方案的桥梁刚度稍大，桥梁动力特性比后者的优，其稳定性也比后者的强；对于密布横梁方案，由于不设纵梁，系梁和混凝土板承受的纵向力都较纵横梁方案的大，混凝土板增幅达50%左右，横梁面内和面外弯矩则明显减小，都低于纵横梁方案的一半，混凝土板顺桥向应力整体比纵横梁方案的高，而横桥向应力则较低，最大值低于纵横梁方案的40%。

The plate beam finite element method of spatial computation is presented for the plate rib T-beam bridge with multi-rib.

由此提出了板肋式多肋T梁桥空间计算的板梁有限单元法。

The article is based on the 6m-span girder bridge in the Country Road 312, using ANSYS to analyze the model of no bearing and simple-supported plate girder bridge, which with width-span ratio of 2 and continuous deck.

以国道312线跨径6m的板梁为例，用ANSYS对宽跨比为2且桥面连续的无支座简支板梁桥进行模态分析。

The entire Superstructure cross-section, except for traffic barrier, shall be considered to be placed at one time for purposes of determining support requirements and designing falsework girders for their stresses and deflections, except as follows: For concrete box girder bridges, the girder stems, diaphrams, crossbeams, and connected bottom slabs, if the stem wall is placed more than 5 days prior to the top slab, may be considered to be self supporting between falsework bents at the time the top slab is placed, provided that the distance between falsework bents does not exceed 4 times the depth of the portion of the girder placed in the preceding concrete placements.

整个上部结构截面除交通障碍，应被视为在一个确定的要求和支持他们的设计应力和挠度除，脚手架时间放在梁的目的如下：对于混凝土箱形梁桥，主梁茎，diaphrams，横梁，和连接底板，如果干墙放置超过5天前向顶板，可能被认为是自我支持之间的脚手架本茨当时顶端板放置，只要脚手架茨之间的距离不超过4倍，在前面的混凝土主梁部分存款放在深度。

And also provide certain theoretical method and reference for continuous research on dynamic design and moving loads identification of the simply supported plate girder bridge.

本文提出的研究方法和成果，将为简支板梁桥的动力分析的进一步研究提供一定的理论依据，也对简支板梁桥的动力设计及移动荷载识别有一定的参考作用。

Due to their simplicity in fabrication and excellent strength to weight ratio, stiffened steel plate are also widely used for construction of land-based structures such as box girder and plate girder bridges.

由于制作简单且有良好的强度重量比，加筋板也广泛应用于制造陆基结构物如箱梁和板梁桥等。

Finally, according to the dynamic assessment of nine typical RC simple bridges (five T-beam bridges and four plate girder bridges), the reliability and applicability of the analytical method and program in the article is verified.

最后通过九座典型公路钢筋混凝土简支梁桥(五座T梁桥、四座板梁桥)的动力法评定验证了本文分析方法及程序的可靠性和适用性。

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。