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91.
谭春如 《南昌大学学报(工科版)》1997,19(1):42-47
简述了江西泰和南车水主加枢纽电站导流洞进口堵水闸门工程中采用钢筋混凝土板梁结构的设计计算，并与钢闸门方案进行了技术经济比较，分析了受力 占及其造价，应用效果。 相似文献
92.
根据箱梁桥的结构特点及振动过程中的位移,由能量原理演绎出箱梁桥空间振动的阻尼矩阵,给出了阻尼矩阵的显式表达式,可供工程实际应用。 相似文献
93.
94.
武立新 《建筑科学与工程学报》1994,(3)
针对预应力混凝土连续梁桥,提出了一种几何模型的建立方法;建立了箱形梁构造的几何模型。在此基础上,成功地开发了预应力混凝土连续梁桥结构制图子系统。 相似文献
95.
分析了抱箍基本结构和螺栓的排列应用,详细分析了抱箍法在现浇箱梁施工中的关键工艺及关键技术,以期为行业发展献言献策. 相似文献
96.
Precast segmental construction can shorten the construction time of the bridge and reduce the impacts on traffic and environment. Thus, this approach has been widely used in many countries. The relevant literature suggests that in the existing segmental precast bridges, nearly all of the centerlines of the girders are aligned with the centerline of the bridge piers. This paper introduces a wide urban viaduct comprising twin separate box girder cells using segmental prefabrication. To save space under the bridge, the bridge has only one row of piers and long cantilever crossbeams are set at the top of each pier. Additionally, the centerline of the girder and the centerline of the pier do not overlap. To prevent eccentric loading and improve the construction speed, two bridge erection gantries are used for synchronous construction. This study is a pioneering attempt at bridge construction with a precast segmental twin-deck box girder bridge simultaneously erected with double gantries. To investigate the stress state of the whole system (crossbeam, gantries, and box girder segments) during construction and demonstrate the feasibility of the construction method, a real bridge was used. The test results provide a reference for the design and construction of similar projects. 相似文献
97.
98.
《工程（英文）》2017,3(6):806-816
The synergistic use of partially encased concrete and composite girders with corrugated steel webs (CGCSWs) has been proposed to avoid the buckling of corrugated steel webs and compression steel flanges under large combined shear force and bending moment in the hogging area. First, model tests were carried out on two specimens with different shear spans to investigate the mechanical behavior, including the load-carrying capacity, failure modes, flexural and shear stress distribution, and development of concrete cracking. Experimental results show that the interaction of shear force and bending moment causes the failure of specimens. The bending-to-shear ratio does not affect the shear stiffness of a composite girder in the elastic stage when concrete cracking does not exist, but significantly influences the shear stiffness after concrete cracking. In addition, composite sections in the elastic stage satisfy the assumption of the plane section under combined shear force and bending moment. However, after concrete cracking in the tension field, the normal stresses of a corrugated web in the tension area become small due to the “accordion effect,” with almost zero stress at the flat panels but recognizable stress at the inclined panels. Second, three-dimensional finite-element (FE) models considering material and geometric nonlinearity were built and validated by experiments, and parametric analyses were conducted on composite girders with different lengths and heights to determine their load-carrying capacity when subjected to combined loads. Finally, an interaction formula with respect to shear and flexural strength is offered on the basis of experimental and numerical results in order to evaluate the load-carrying capacity of such composite structures, thereby providing a reference for the design of partially encased composite girders with corrugated steel webs (PECGCSWs) under combined flexural and shear loads. 相似文献
99.
Spatial crane girder – common and seminar rooms as stacked formation in a workshop With the modification of a factory workshop, new social rooms for the employees of a company working in the field of electrifications for trains and busses were created. Since an enlargement of the existing factory workshop on the area of the company ground would interfere with the existing traffic flow, the new rooms had to be built inside the workshop. To minimize the footprint, the new rooms are stacked on top of each other and hung up on the existing crane runway. Closing down the crane in the south‐west part of the workshop (the trolley is design for loads up to 20 t) where the new construction is located, allows to use the existing crane runway as support. The stapled rooms are built of a hybrid and light construction of steel and wooden box‐section slabs (18 t of steel and 25 t of extension loads). The position of the suspension enables the supporting structure of the workshop to bear the higher loads without having to reinforce the structure or the foundation of the workshop. Merely the crane runway along the façade had to be reinforced by thin plain sheets welded to the flanges of the runway section, as well as four brackets carrying the runway. 相似文献
100.
Getwingbrücke Zermatt – a differently designed single‐span girder The new Getwingbrücke is located near the famous Matterhorn mountain in Switzerland, on the narrow‐gauge railway line between Zermatt and Gornergrat, which is Europe's highest railway station. Under difficult conditions, the planning team composed of schlaich bergermann partner, Schneller Ritz and Partner, and Mooser Lauber Stucky Architects designed the new bridge, ready for construction, as a replacement for the existing 114‐year‐old truss bridge and coordinated its construction on site. The efficient load‐bearing structure of the trussed girders arranged below the track had to be significantly reduced in height in order to comply with the new structural clearance of the of the crossing road bridge. Because of the sensible urban situation, the client organized a competition with five preselected teams. According to the jury of the competition, our design was judged as the best one, as it represents a strong design impression in combination with the bridge's very good integration into the structural environment and an unobstructed view of the Matterhorn. 相似文献