客运专线简支下承式纵横梁体系钢桁结合梁桥的研究
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摘要
纵横梁体系钢-混凝土结合桥面的下承式钢桁结合梁桥由于刚度大、建筑高度低、振动小、主桁受力明确而受到设计人员的青睐。随着我国客运专线的大力建设,这种桥式结构应用越来越多。本文以64m、80m和106m三种跨度双线纵横梁体系简支下承式钢桁结合梁桥为例,分别对每种跨度桥梁的混凝土桥面板与纵横梁结合(SCSC)、只与纵梁结合(SCOS)两种方案建立空间有限元模型,计算了主力及温度作用下结构的位移、应力和内力,主要完成以下工作:
1、分析了主力组合作用下纵横梁体系64m、80m和106m三种跨度、两种桥面结合方案的变形和受力性能,结果表明三种跨度桥梁的刚度、强度均满足规范要求。
2、研究了纵横梁体系每种跨度桥梁的纵梁、横梁和下弦杆的刚度匹配问题,结果表明:64m、80m跨度的纵梁、横梁和下弦杆的应力水平基本一致,表明三者刚度匹配较好。106m跨度的横梁略显单薄,本文将其端部两根横梁改成箱形截面后,面外弯曲应力大为减少。
3、考察了温度作用下纵横梁体系三种跨度、两种桥面结合方案的受力性能。结果表明:当主桁温度比混凝土板、纵横梁高15℃时,纵横梁相交处和混凝土板沿外纵梁处或板边处产生了较大的拉应力,故必须考虑温度作用的不利影响。
4、研究了混凝土板与横梁结合与否对桥梁刚度和强度的影响问题,结果表明:同一跨度纵横梁体系桥梁两种桥面结合方案的竖向刚度差别较小,横向刚度SCSC方案比SCOS方案大,其中80m跨度的横向刚度差别明显,64m次之,106m最小。主桁的上、下弦杆及腹杆的应力两种桥面结合方案相差不大,横梁应力SCOS方案比SCSC方案大,纵梁应力和混凝土板顺桥向拉应力SCOS方案比SCSC方案小,说明混凝土桥面板与横梁结合与否,对主桁各杆件应力影响不大,对桥面系应力影响较大。
5、研究了桥面系参与主桁共同作用问题,结果表明:桥面系参与承担纵向力的程度SCSC方案比SCOS方案高;同一方案下基本上是端部节间至跨中节间依次降低,而80m跨度节间2高于其它节间,这是由于横梁2的面外抗弯刚度最大。
本文的研究成果为我国客运专线下承式纵横梁体系钢桁结合梁桥的设计提供了依据,对其他类似的桥梁结构也具有参考价值。
Deck-through steel truss-concrete deck composite bridges with the concrete deck combining with stringers and cross beams so that they act together favors the bridge designers because they have big stiffness, low architecture height, low vibration, simple forces of main truss and so on. With the construction of passenger dedicated lines in China, this kind of bridge has been applied more and more often. In this paper, three bridges with span of 64 meters, 80 meters and 106 meters respectively were taken as examples. Two composite forms of deck system of each bridge were studied, the one is the concrete deck combining with stringers and cross beams (SCSC for short), and the other is the concrete deck combining only with stringers (SCOS for short). With space finite element method, the displacements, stresses and internal forces of the three bridges under primary forces and temperature difference were calculated and analyzed. The main research work is as follows:
1. Deformation and mechanical behavior of three bridges with span of 64 meters, 80 meters and 106 meters respectively of SCSC and SCOS under the combination of primary forces were analyzed. The results show that rigidity and strength of all bridges are satisfied.
2. The problem whether the rigidity of stringers, cross beams and lower chords matches well or not was analyzed. The results show that rigidity of the three members matches well, because the stress level of the three members is near. As to 106-meter-span bridge, stress lever of cross beams is larger than that of stringers and lower chords, after changing the two crossbeams in the end region of bridge for box section, the stress, especially, out-of-plane bending stress has dropped considerably.
3. Mechanical behavior of three bridges with span of 64 meters, 80 meters and 106 meters respectively of SCSC and SCOS under temperature difference was analyzed. The results show that when temperature of main truss is 15 degrees larger than that of members of deck system, large tensile stresses of the cross of stringers and cross beams and on the edge or along the external stringers of concrete deck were caused. Therefore, adverse effect of temperature difference must be taken into account.
4. The effect of the concrete deck combining with cross beams or not on rigidity and strength of bridges was analyzed. The results show that vertical rigidity of SCSC and SCOS of the same span bridge are very close; and lateral rigidity of SCSC of the same span bridge is larger than that of SCOS, and the difference of lateral rigidity between SCSC and SCOS of 80-meter-span bridge is largest, 64-meter-span, 106-meter-span bridge takes second, third place. Stresses of members of main truss of SCSC and SCOS are near, but stresses of cross beams of SCSC are larger than those of SCOS, however, stresses of stringers and longitudinal tensile stress of concrete deck of SCSC are smaller than those of SCOS. So the effect of the concrete deck combining with cross beams or not is small on members of main truss and is large on members of deck system.
5. The co-action of deck system and main truss was analyzed. The results show that the degree for deck system to undertake longitudinal forces of SCSC is larger than that of SCOS, and decreases little by little from end panels to middle panels in the same composite form of deck system. However, it is largest in panel 2 of 80-meter-span bridge, due to the largest out-of-plane flexural rigidity of crossbeam 2.
The research results of this paper can provide a design basis for the deck-through steel truss-concrete deck composite bridges with the concrete deck combining with stringers and cross beams and reference for other similar bridges.
1、分析了主力组合作用下纵横梁体系64m、80m和106m三种跨度、两种桥面结合方案的变形和受力性能,结果表明三种跨度桥梁的刚度、强度均满足规范要求。
2、研究了纵横梁体系每种跨度桥梁的纵梁、横梁和下弦杆的刚度匹配问题,结果表明:64m、80m跨度的纵梁、横梁和下弦杆的应力水平基本一致,表明三者刚度匹配较好。106m跨度的横梁略显单薄,本文将其端部两根横梁改成箱形截面后,面外弯曲应力大为减少。
3、考察了温度作用下纵横梁体系三种跨度、两种桥面结合方案的受力性能。结果表明:当主桁温度比混凝土板、纵横梁高15℃时,纵横梁相交处和混凝土板沿外纵梁处或板边处产生了较大的拉应力,故必须考虑温度作用的不利影响。
4、研究了混凝土板与横梁结合与否对桥梁刚度和强度的影响问题,结果表明:同一跨度纵横梁体系桥梁两种桥面结合方案的竖向刚度差别较小,横向刚度SCSC方案比SCOS方案大,其中80m跨度的横向刚度差别明显,64m次之,106m最小。主桁的上、下弦杆及腹杆的应力两种桥面结合方案相差不大,横梁应力SCOS方案比SCSC方案大,纵梁应力和混凝土板顺桥向拉应力SCOS方案比SCSC方案小,说明混凝土桥面板与横梁结合与否,对主桁各杆件应力影响不大,对桥面系应力影响较大。
5、研究了桥面系参与主桁共同作用问题,结果表明:桥面系参与承担纵向力的程度SCSC方案比SCOS方案高;同一方案下基本上是端部节间至跨中节间依次降低,而80m跨度节间2高于其它节间,这是由于横梁2的面外抗弯刚度最大。
本文的研究成果为我国客运专线下承式纵横梁体系钢桁结合梁桥的设计提供了依据,对其他类似的桥梁结构也具有参考价值。
Deck-through steel truss-concrete deck composite bridges with the concrete deck combining with stringers and cross beams so that they act together favors the bridge designers because they have big stiffness, low architecture height, low vibration, simple forces of main truss and so on. With the construction of passenger dedicated lines in China, this kind of bridge has been applied more and more often. In this paper, three bridges with span of 64 meters, 80 meters and 106 meters respectively were taken as examples. Two composite forms of deck system of each bridge were studied, the one is the concrete deck combining with stringers and cross beams (SCSC for short), and the other is the concrete deck combining only with stringers (SCOS for short). With space finite element method, the displacements, stresses and internal forces of the three bridges under primary forces and temperature difference were calculated and analyzed. The main research work is as follows:
1. Deformation and mechanical behavior of three bridges with span of 64 meters, 80 meters and 106 meters respectively of SCSC and SCOS under the combination of primary forces were analyzed. The results show that rigidity and strength of all bridges are satisfied.
2. The problem whether the rigidity of stringers, cross beams and lower chords matches well or not was analyzed. The results show that rigidity of the three members matches well, because the stress level of the three members is near. As to 106-meter-span bridge, stress lever of cross beams is larger than that of stringers and lower chords, after changing the two crossbeams in the end region of bridge for box section, the stress, especially, out-of-plane bending stress has dropped considerably.
3. Mechanical behavior of three bridges with span of 64 meters, 80 meters and 106 meters respectively of SCSC and SCOS under temperature difference was analyzed. The results show that when temperature of main truss is 15 degrees larger than that of members of deck system, large tensile stresses of the cross of stringers and cross beams and on the edge or along the external stringers of concrete deck were caused. Therefore, adverse effect of temperature difference must be taken into account.
4. The effect of the concrete deck combining with cross beams or not on rigidity and strength of bridges was analyzed. The results show that vertical rigidity of SCSC and SCOS of the same span bridge are very close; and lateral rigidity of SCSC of the same span bridge is larger than that of SCOS, and the difference of lateral rigidity between SCSC and SCOS of 80-meter-span bridge is largest, 64-meter-span, 106-meter-span bridge takes second, third place. Stresses of members of main truss of SCSC and SCOS are near, but stresses of cross beams of SCSC are larger than those of SCOS, however, stresses of stringers and longitudinal tensile stress of concrete deck of SCSC are smaller than those of SCOS. So the effect of the concrete deck combining with cross beams or not is small on members of main truss and is large on members of deck system.
5. The co-action of deck system and main truss was analyzed. The results show that the degree for deck system to undertake longitudinal forces of SCSC is larger than that of SCOS, and decreases little by little from end panels to middle panels in the same composite form of deck system. However, it is largest in panel 2 of 80-meter-span bridge, due to the largest out-of-plane flexural rigidity of crossbeam 2.
The research results of this paper can provide a design basis for the deck-through steel truss-concrete deck composite bridges with the concrete deck combining with stringers and cross beams and reference for other similar bridges.
引文
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[4]叶梅新.扬长避短协同工作--铁路桥梁上的钢-混凝土组合结构.铁道知识,2004,(5):30-31
[5]向海帆,吴定俊.我国铁路桥梁的现状和展望.铁道建筑技术,2001,18(2):1-6
[6]陈修正.建设中国高速铁路的必要性.中国软科学,1995,10(9):12-14
[7](日)小西一郎.钢桥(第一分册).北京:人民铁道出版社,1980
[8]侯文葳.日本北陆新干线波形钢腹PC箱形结合梁桥.世界轨道交通.2004,(2):21-23
[9]周胜利,林亚超.日本北陆新干线犀川桥.国外桥梁,1996,(3):1-11
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