组合箱斜系梁桥预应力技术

为了把力学分析数量化，以便更清楚地反映出结构随斜交角度变化的内力特性，以一计算跨径为60m、垂直宽度为12m的双肋刚性系杆刚性烘的系杆拱桥作为结构分析模型。吊杆间距为5m，矢跨比采用1／6，拱肋上设三道风撑，拱肋轴线方程为二次抛测线，斜度α取值为0度，10度，15度，20度，25度，30度，35度，40度及45度。设计施工技术及材料研究应用等方面都取得了快速的发展和提高，桥梁结构形式也在不断地被赋予新的内容和活力。正由于钢管混凝土、预应力技术和各种桥梁施工方法等在下承式系杆拱桥中的应用，同时由于其自身的结构特点，使该结构在国内各地得到越来越多的应用和研究。

Quantification to mechanics analysis, in order to more clearly reflect the structural internal force characteristics change with oblique Angle, calculated with a span of 60 m, width of vertical double rib is 12 m rigid tie bar rigid baked arc bridge as the structural analysis model. Derrick spacing is 5 m, rise-span ratio 1/6, three wind brace is set on arch rib, rib arch axis equation of the second line, Angle alpha values to 0 degrees, 10, 15,

20 degrees, 25, 30, 35 degrees, 40 degrees and 45 degrees. Design and construction technology, and the application of materials research has achieved rapid development and increase of bridge structures are being given new content and vitality. Is because of steel tube concrete, prestressed technology and all kinds of bridge construction methods in the application of concrete-filled arc bridge, at the same time, due to its structural characteristics, make the structure in the country has more and more application and research.

下承式系杆拱桥较多的做成两片拱架结构，或者做成单承重面拱架结构；当桥面宽度较大时，有时设臵三片拱架，或者做成分离的两幅系杆拱桥。该桥型一般都是正交布臵的结构形式。由于近年来公路等级的提高，路线线形技术要求也相应提高了，使路线与河道经常形成斜交的情况，对于40m跨径以内的桥梁，根据需要，一般可以把桥梁布臵成与路线一致的斜交结构形式，像斜板梁桥、斜T梁桥及斜组合箱梁桥等。更大跨径时，斜支承连续梁桥及斜连续刚构桥等也可采用，并已有一些这方面的桥例，在拱式体系中，有斜上承式肋拱桥。斜石拱桥等形式。这些

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构造处理可以缩短桥长、路桥连接顺畅、减小全桥工程量、节约造价。而当路线与河道为斜交时，从总体上考虑采用系杆拱桥结构形式时，譬如主跨要求较大而又不需做边跨、通航要求较高、桥面标高受到限制等时，若斜交正做，则肯定要加大桥梁跨径，这样使得系杆及桥面加长，桥面板及内横梁数量增加，吊杆数也要增多，拱肋跨度必然加大；同时由于跨径变大，使得结构内力增大，材料用量增多；且支座设计吨位变大，加大下部结构造价。因此，斜系杆拱桥这种结构形式便应运而生了。

Concrete-filled more arc bridge made of two pieces of arch structure, or made into single bearing surface arch structure; When bridge deck width is bigger, sometimes set three arch, or separation of the two arc bridge. The bridge is generally the structure of orthogonal layout. Because in recent years, highway level enhancement, the route it can raise the technical requirements, make the line oblique, often form and channel for within 40 m span bridge, according to the needs, generally can decorate the Bridges as consistent with the course of oblique structure form, like the combination of

skew girder bridge and skew T girder bridge and skew box girder bridge, etc. More long-span, oblique bearing continuous beam bridge and continuous rigid frame bridge can be used, and there have been some cases this aspect of the bridge, the arch type system, has a bearing on the diagonal rib arch bridge. Oblique arch form. These tectonic process can shorten the long bridge, bridge connection is smooth, reduce the total quantity and cost saving. And when the route and the channel is oblique, from overall considering adopt arc bridge structure form, such as the mainspan side span, demand is bigger and does not need to do navigation requirements higher, bridge deck elevation limit, etc., if the skew is doing, is bound to increase the bridge spans, so that the elongation of the tie and bridge deck beam bridge panel and inner quantity increases, the number of derrick to increase, span of arch rib will increase; Due to the larger models at the same time, makes the structure internal force increases, material consumption increase; And support the design tonnage, increase in infrastructure cost. Inclined arc bridge,

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therefore, this structure can develop.

但斜系杆拱桥目前几乎还很少有建造的桥例，也较难收集到这方面的资料，只是设计人员在布臵系杆拱桥桥型并遇到路线与河道斜交时，经常会提出斜系杆拱桥这种想法。但因为正交系杯拱桥与其他常用桥梁结构形式相比修建仍是要少；再者系杆拱桥跨径一般做得较大，在上述情况下，往往就会用斜交正做的方法来处理，故修建得较少。

But there is few inclined arc bridge is almost built bridge example, also difficult to collect this information, only the designers in route and decorate the arc bridge bridge and river oblique, often inclined arc bridge the idea is put forward. But because the orthogonal system compared with other forms of common bridge structure cup arch bridge construction is less; Moreover arc bridge span larger, do you usually do in these cases, tends to be made of skew is method to deal with, so less.

斜系杆拱桥与正系杆拱桥相比，其构造必然地要发生变化，像桥面系构造、横梁及风撑与系杆或拱肋相交结点、

预应力钢束锚固构造等，都必须作相应的特殊处理。桥面系横梁的计算长度由于斜交而增大了，且与系杯斜交故会呈现出与正系杆拱桥不同的内力特性。 本文采用空间分析方法仅对斜系杯拱桥的恒载内力进行分析探讨，以得出一些定性的内力特性。 二、分析模型 系杆拱桥主要是由杯件组装而成的一个空间杆件体系，主要承重体系为拱架，由系杆。拱肋及吊杆组成，作用在桥面系的恒活载由桥面板经横梁传给拱架结构的系杆上，并通过吊杆传至拱肋。就目前较多采用的刚性系杆刚性拱形式的系杆拱桥来说，作为连接两片拱架的桥面系横梁，由于系杆对横梁的扭转约束作用，横梁两端支承情况既不是简支也不是固端，而是处于两者之间的一种弹性嵌固约束状态。横梁瑞部承受的弯矩作用于拱架的系杆上即为系杆结点所承受的扭矩，故拱肋和系杆截面除了作用有弯矩、剪力及轴力外，还作用有扭矩。斜系杯拱桥在构件组成上与正的没有什么区别。主要是横向连接杆件像桥面系横梁及拱肋上风撑相应于系杯及拱肋由于非正交而形成一斜交角度。桥面系中桥面板也因作为支承的横梁斜臵而必须设计成斜板结构，但斜板跨径在系杆拱桥中由于横梁间距不大（一般为4～8m），故与一般斜板结构没有什么大的构造及受力区别，但横梁斜臵后却使横梁传给系杆结点的作用力发生了某种变化，横梁计算跨径加大了，横梁与系杆

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的相互约束情况也由于斜交角度的大小变化而与正交时不同了。同时定性分析，横梁上可能会产生正交时所没有的扭矩，从而使系杆各结点上作用有附加弯矩。因此，要了解各构件内力随斜度变化的内力特性，必须从整体结构采用空间杆系有限元方法来考虑。

Inclined arc bridge is compared with the positive arc bridge, the construction inevitably want to change, as the floor system of structure, beams and wind brace and the tie bar or arch rib intersection

node,

anchored

structure

of

prestressed steel beam etc., must make the corresponding special processing. Floor system due to the oblique beam the calculation of the length increases, and with a cup of oblique so will appear and internal force characteristics of arc bridge is different. Spatial analysis method in this paper only the diagonal is cup of dead load internal force analysis of arch bridge, in order to draw some qualitative internal force characteristics. Second, the analysis model of arc bridge is mainly composed of cup parts of a space bar system, main bearing

system for arch, by the tie bar. Of arch rib and derrick, role in the live load of the bridge deck system made up by bridge panel by the beam to the tie bar arch structure, and through the boom to arch rib. Is the rigid tie bar in use more rigid arch form arc bridge, as a connect two arch bridge beam, due to the effect of torsion constraint of the tie bar to bar, beam supporting situation is neither Jane nor fixed end, but somewhere in between an elastic solid state constraints. Beam ray department under bending moment acting on the on the tie bar arch is the bracing node on the torque, so the arch rib and the tie bar cross section in addition to the bending moment, shear force and axial force, also have torque. Inclined is cup of arch bridge on the artifacts and is no different. Mainly lateral connection bar like bridge deck system of beam and arch rib of the upper hand brace corresponds to the cup and the arch rib nonorthogonal to form an oblique Angle. Floor system tin panel must be designed by as a supporting beam oblique oblique plate structure, but inclined plate in arc bridge span due to beam spacing is not big

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(usually 4 ~ 8 m), and general oblique plate there is no difference between structure and mechanical structure, but makes the beam after beams oblique to tie some changes have taken place in the power of the node, beam calculation span increased, beams and bracing constraint is also due to the size of the skew Angle

changes

with

different

orthogonal.

Qualitative analysis at the same time, the beam may produce orthogonal when no torque, so that the tie have additional bending moment on each node. Components, therefore, to understand the internal force characteristics of internal force changing with Angle, must from the overall structure of the space bar system finite element method is used to consider.