波纹钢腹板桥梁静动力特性研究

发布时间：2018-05-14 06:13

本文选题：波形钢腹板 + 静力分析　；参考：《华东交通大学》2014年硕士论文

【摘要】：波形钢腹板PC桥梁源于法国，由于这种新型桥梁能彻底解决混凝土箱梁桥“腹板开裂”顽症、且具有很高承载能力，20世纪80年代在法国出现后便很快在日本、德国、韩国等国家得到应用和推广。我国也对该新型桥梁展开大量的科学研究，，并成功建设了几十座波纹钢腹板桥梁。到目前为止，各国已系统研究波纹钢腹板简支梁结构的静力性能如抗剪、抗弯、抗扭、钢腹板的稳定性，而简支变连续桥梁的受力分析却较少，并且对于波纹钢腹板桥梁的动力特性研究还在起步阶段。本文依托一座已建的简支变连续波纹钢腹板桥梁为例，采用有限元方法，主要对比分析了波形钢腹板桥梁和混凝土桥梁的静力性能和动力特性，研究了横隔板对波纹钢腹板桥梁的影响和比较分析了该桥梁抗震性能。本文的研究工作表明：波形钢腹板桥梁和混凝土腹板桥梁同样具有很强的抗弯性能，且具有更好的抗剪性能。波形钢腹板轴向刚度非常低，基本不抵抗轴向力和弯矩，可以认为波形钢腹板桥梁弯矩产生的正应力主要由混凝土顶板和底板承受。在波纹钢腹板桥梁中，混凝土顶板和底板基本不承受剪力，转由钢腹板全部承受。对比两者的动力特性发现，波形钢腹板桥梁扭转振动的频率低于混凝土腹板桥梁；增加横隔板可以提高结构扭转振动的自振频率，端隔板对波纹钢腹板桥梁自振特性的影响较大，而跨中横隔板数量对波纹钢腹板桥梁自振特性的影响较小。在竖向地震输入的情况下，波纹钢腹板桥梁和混凝土腹板桥梁的变形形态很类似，表明波纹钢腹板桥梁同样具有很强的抗弯刚度。根据地震作用横向输入的反应谱组合变形结果，发现波纹钢腹板桥梁和混凝土腹板桥梁的变形形态存在较大差异，表明波纹钢腹板对顶板及底板的约束作用小于混凝土箱梁方案中腹板对顶板和底板的约束作用。在相同的地震波输入下，波纹钢腹板桥梁的时程响应明显小于混凝土腹板桥梁。原因在于波纹钢腹板桥梁纵向刚度较小，地震能量输入后可以通过变形来消耗，不至于产生过大的内力。综合反应谱和时程分析结果发现，波纹钢腹板桥梁的抗震性能更加优越。
[Abstract]:The corrugated steel web PC bridge originated in France, because this new type of bridge can completely solve the "web crack" disease of concrete box girder bridge, and has a very high bearing capacity. After it appeared in France in the 1980s, it was soon in Japan and Germany. Korea and other countries have been applied and promoted. China has also carried out a lot of scientific research on the new bridge and successfully constructed dozens of corrugated steel web bridges. So far, many countries have systematically studied the static properties of simply supported corrugated steel web beam structures such as shear resistance, bending resistance, torsion resistance, and stability of steel web plates, but the stress analysis of simply supported and continuous bridges is less. And the dynamic characteristics of corrugated steel web bridges are still in the initial stage. In this paper, based on the example of a simply supported variable continuous corrugated steel web bridge, the static and dynamic characteristics of corrugated steel web bridge and concrete bridge are compared and analyzed by finite element method. The influence of transverse diaphragm on corrugated steel web bridge is studied and the seismic performance of the bridge is compared. The research work in this paper shows that both corrugated steel web bridges and concrete web bridges have strong flexural properties and better shear resistance. The axial stiffness of corrugated steel web plate is very low, and it is not resistant to axial force and bending moment. It can be considered that the normal stress caused by bending moment of corrugated steel web bridge is mainly borne by concrete roof and bottom plate. In corrugated steel web bridge, the concrete roof and bottom are not subjected to shear force, but to steel web. Compared with the dynamic characteristics, the frequency of torsional vibration of corrugated steel web bridge is lower than that of concrete web bridge, and the natural vibration frequency of torsional vibration of structure can be increased by increasing transverse diaphragm. The effect of the end partition on the natural vibration characteristics of corrugated steel web bridges is greater, while the number of cross-section plates has little effect on the natural vibration characteristics of corrugated steel web bridges. In the case of vertical seismic input, the deformation of corrugated steel web bridges and concrete web bridges is very similar, which indicates that corrugated steel web bridges also have strong flexural stiffness. According to the response spectrum combined deformation results of lateral input of seismic action, it is found that the deformation patterns of corrugated steel web bridges and concrete web bridges are quite different. It is shown that the constraint effect of corrugated steel web on roof and bottom is less than that on top and bottom in concrete box girder scheme. Under the same seismic wave input, the time-history response of corrugated steel web bridges is obviously smaller than that of concrete web bridges. The reason is that the longitudinal stiffness of corrugated steel web bridges is small and the seismic energy input can be consumed by deformation so as not to produce excessive internal force. The results of response spectrum and time history analysis show that the seismic performance of corrugated steel web bridges is better than that of corrugated steel web bridges.
【学位授予单位】：华东交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441

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