Cable-stayed bridge design itself has a sense of rhythm, and the special-shaped bridge tower structure can be used to make its aesthetic attributes outstanding, but the use of special-shaped bridge towers often makes the stress state more complicated, and the results are not universal, and targeted research needs to be carried out. Based on the Dongping River Bridge project where the main bridge is a special-shaped cable-stayed bridge, this paper analyzes two types of stability problems of the herringbone rigid frame and diagonal brace tower structure, and considers the influence of different cable forces. The results show that for such special-shaped bridge towers, the use of the first type of stability analysis may lead to a great overestimation of the stability safety factor, and the true instability mode cannot be obtained. The instability of the special-shaped bridge tower structure is significantly affected by the nonlinear factors of the material, and increasing the cable force will make the local structure more prone to plastic deformation, resulting in a significant reduction in the second type of stability safety factor.

施工方法对桥梁成桥状态内力具有重大影响,对桥梁不同施工顺序下的内力进行分析具有非常重要的工程意义.对于钢管混凝土系杆拱桥,常见的施工方法主要有先梁后拱法和先拱后梁法2种.为探究上海罗蕰河拱桥采用不同的施工顺序对成桥的影响,采用MIDAS-CIVIL(2015)建立罗蕰河拱桥一次落架、先梁后拱和先拱后梁3种状态下的有限元模型,计算获得相应的内力分布,分析不同施工方法对罗蕰河系杆拱桥成桥状态内力的影响,并以弯曲应变能为指标,评价3种施工方案的区别.

平申线航道(上海段)整治工程中泖港大桥主桥为一座预应力混凝土箱梁与钢箱梁混合而成的桥梁,桥梁的总体跨径布置为65 m+135 m+65 m,其中主跨跨中55 m范围布置了钢箱梁其他部分布置为预应力混凝土连续梁.该桥的主梁在中间桥墩处梁高为7.2m,高跨比为1/18.75,跨中梁高3.2m,高跨比1/42.18,混凝土部分箱梁梁底按2次抛物线变化,钢箱梁采用等截面形式.对该桥采用ANSYS软件建立板壳实体模型进行主桥整体分析表明,该桥各个结构部位的受力满足规范要求.该桥的施工方法采用了悬臂对称浇筑混凝土梁段、支架上浇筑边跨混凝土合龙段、施工钢混结合段以及整体吊装钢箱梁节段等.运营情况表明该混合梁结构形式具有优良的力学性能,可供类似工程参考.

以上海某泖港大桥为工程背景,针对混凝土连续梁悬臂倒拆拆除过程中挂篮吊卸的箱梁节段坠落对主体结构的冲击作用,提出冲击动力可靠度归一化方法.研究箱梁节段突然坠落对主梁结构承载力可靠度的影响,在非线性瞬态研究基础上提出了冲击稳定性动力可靠度概率公式.研究内容及结果对悬臂机械切割倒拆拆除方法具有指导意义.

系杆拱桥拱脚应力分析在全桥整体分析过程中属于重点和难点,需在整体模型的基础上建立更高精度的有限元模型进行分析.通过与整体模型的拱脚位移对比,选取结构刚度、边界条件,并制定适当的假定,在MADIS/FEA中建立的拱脚模型.在建立好的模型上施加荷载,进行多方向多尺度的应力分析,最终得出了拱脚应力扩散结论,即混凝土压应力从拱肋传导到拱脚的过程中迅速扩散,在桥梁纵向没有形成很大的压应力峰值,在混凝土抗压强度标准值允许范围之内.对接规范,保证了罗蕴河大桥在拱脚关键部位的安全和可靠.

黑河-布拉戈维申斯克黑龙江(阿穆尔河)界河桥是中俄2 800 km边界的黑龙江上首座公路大桥,起点位于中国黑龙江省黑河市长发屯,终点位于俄罗斯阿穆尔州布拉戈维申斯克市卡尼库尔干村,路线全长19.9 km,中 方境内长6.5 km,俄方境内长13.4 krn,标准为二级公路.跨江主桥为九跨六塔连续矮塔斜拉桥,主跨147 m,总长1 078.72 m;主梁采用钢-混凝土组合结构.主要介绍大桥的总体设计.

一、立项背景<br>　　桥梁顶升起源于20世纪50年代的铁路桥梁架设、移位，在90年代由于液压顶升技术的发展始用于整体同步顶升。随着计算机的发展和普及，桥梁顶升技术也得到相关发展，在相关领域开始应用。

横潦泾大桥主桥是G1501跨越上海市黄浦江上游的一座变高度预应力混凝土连续梁桥，跨径组合85m＋125m＋85m。由于黄浦江上游航道整治的要求，既有桥梁的桥下净空不能满足整治后的通航标准，需要对其整体顶升1．58m。由此，介绍了主桥的顶升设计和施工，为今后类似工程提供参考。

Yangmingtan Bridge is a super-large bridge crossing Songhua River,located in west line of Three-ring Rd.in Harbin.The main bridge appearance is adopting neoclassicism European style with the total beam length of 6 464 m.The main bridge is five-span twin-tower self-anchored suspension bridge with the main span of 248 m,and the stiffening girder is adopting the combination of steel-concrete composite beam and reinforced concrete box girder.The relevant design technology standard and general design are introduced and the choice reason and selection condition of main bridge type layout plan are presented briefly.The structure design of bridge beam is introduced from several aspects including stiffening girder,main tower,cable system,cable saddle cable clip,etc.

The main bridge of the Yunzaobang River Bridge on Taopu Road in Jiading District of Shanghai City is a composite structure of two-span continuous through steel truss girder truss arch bridge with span arrangement(66+136) m.The bearing system is twin steel trusses composed of box or H member and the floor system is composed of girders,transverse beams and a steel orthotropic deck.All bars are welded.In this paper,the structure design and analysis of the main bridge are introduced.

The formula for cracking width calculation presented in the current design code is applicable for the structural member with regular cross-section,but it is only approximately applied for the shaped inclined strut of the shaped rigid frame.By use of the non-linear finite method for reinforced concrete,this paper obtains the calculated stresses of rebar in cracking area and analyzes the cracking distribution of cracked concrete,through ANSYS three dimensional finite element analysis.The analysis results which are presented in this paper can be technical supports for the durability design of the rigid frames.

Objective Quantum dots(QDs) immunofluorescence was compared with the immunoenzyme method in uccurately locating different proteins in paraffin embedded tissues,to detect co-expression of two different proteins.The initial application value of QDS was investigated by using it.Methods QDs immunofluorescence histochemistry(QDs-IHC) and immunoenzyme histochemistry were used to detect the expression of p53 protein in the lung cancer tissues,calponin protein in the myoepithelial cells of breast tissues,and LCA protein in the normal appendix tissues.Co-expression of CK and PCNA proteins in the human cervical intraepithelial neoplasia,Her-2 and CK proteins in the breast cancer tissues were simultaneously detected by QDs double-labeling immunofluorescence.Results Location of p53,LCA and calponin proteins was completely concordant through QDs-IHC and immunoenzyme histochemistry.Co-expression of CK and PCNA proteins in the cervical intraepithelial neoplasia,Her-2 and CK proteins in the breast cancer tissues were simultaneously observed by QDs double-labeling immunofluorescence combined with multispectral imaging.Conclusion The same application value was found between QDs-IHC and immunoenzyme histochemistry.Co-location of different proteins were simultaneously detected by QDs double-labeling immunofluorescence.

Taking the typical integral welded joint of Shanghai Minpu Bridge Ⅱ for example,an experimental study about steel truss girder integral welded joint stress whole process is completed under different load cases by use of node model in this paper.The results indicate that 1) the safety and reliability of the nodes can meet the requirements of relevant standards under the condition of the designed load case and the over-load case;2) stress concentration has appeared on the arc-shaped corners of upper chords web members and right left web members;3) the stress of top bottom plates is bigger than other ones.

Minpu No.2 Bridge is a highway and railway integrated double-floor overlarge bridge.The main bridge is a single-pylon double-plane double-floor cable-stayed bridge.It is the longest-span highway and railway double-floor cable-stayed bridge in China.The article mainly introduces the design conception and technical innovation of the main bridge able to be referred for the specialty members.

The foundations of pylons of the Second Minpu Bridge in Shanghai were placed in between the main and auxiliary navigable spans of the Bridge and the vessel collision protection for the foundations is therefore of particular importance.In this paper,the design code and empirical formulas are used to calculate the vessel collision force to be applied onto the foundations and the finite element simulation method is also used to analyze the vessel collision risk of the foundations equipped with or not equipped with the collision protection facilities.

Minpu Bridge 2 is a super large bridge with the integrated double decks for highway and rail traffic. The main part is of the double-decked cable-stayed bridge with a single pylon and double cable planes, which is the largest of the kind in current China. Introduced hereby are the ideas for the design, mainly from the arrangement of main spans, type of bridge, overall layout, wind resistance, the superstructure and substructure design, including the relevant key techniques from the welded nodes, the performance of coupling and vibration, antiseismic properties, wind resistant properties, the system against collision by ships and the system monitoring the condition of the bridge.

Minpu Bridge 2 in Shanghai is a cable-stayed bridge with the steel plate-truss composite girder, a single pylon and double cable planes. The main pylon is of the single column type along the bridge and the H-formed structure across the bridge. Introduced hereby is the pylon design. A . static analysis is made longitudinally based on the dead load, active load, temperature impact and wind load. The force across the bridge is also analyzed in the stages of construction and completion of the pylon and when the bridge is finished, including the ways of construction to overcome the self-weight bending moment and the transverse cracks in the cross beam generated from the slanted pylon column.

Wusong Creek Bridge on the Outer Ring Rd, Shanghai, is a PC continuous girder bridge with three spans (40 m+65 m+40 m). It is found after inspection that there are serious open diagonal cracks in the web of the box girder, whose width and length are already affecting the bearing capacity and durability of the bridge. It is necessary to mend and strengthen the bridge. Introduced hereby are the principles, calculation and design for such strengthening, by sticking vertical steel strips on the cracked area of the internal side and carbon fiber textile on the external side of the box girder.

Minpu Bridge II is a super large bridge with the integrated double decks for both highway and light rail traffic. The main part is cable stayed through a single pylon and double cable sectors. Described hereby is how to select the main span girder from multiple options. The steel plate-truss composite girder is finally adopted, which is structurally reliable, with appropriate functions and simple construction.

For the design of Shanghai Minpu Bridge II, a super large double-decked cable-stayed bridge for both highway and light rail traffic, to reach a rationally stressed and structurally optimized result, FEM is adopted to make an overall analysis of the bridge design, and simply the structure according to the features thereof. With a set of principles for calculation determined corresponding to the design, relevant results are obtained, showing that the overall structural design is safe, feasible and rational, and proving that the design principles, especially those for cable force adjustment, are in compliance with the structural requirements and features.