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Mechanical Behaviors of RC Rigid Frame Arch Bridge and Strengthening Techniques for Joints

Author: LiChong
Tutor: LiSongHui
School: Shandong University of Science and Technology
Course: Bridge and Tunnel Engineering
Keywords: Roads and bridges Rigid Frame Arch Lateral load distribution factors Overload Built - in profiled steel sheet
CLC: U448.22
Type: Master's thesis
Year: 2010
Downloads: 63
Quote: 0
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Abstract


With China's rapid economic development, highway traffic volume and vehicle load is increasing, resulting in most bridge the long-term is overloaded operators, and the emergence of a different degree of disease and a significant security risk, the safe operation of the highway bridge. Disease characterized existing dilapidated bridges, reinforced concrete arch bridge has a strong representation widespread carries the potential problem of insufficient size node cracking diseases. Due to the rigid frame arch has a compact structure, beautiful appearance, low cost, it is necessary to conduct in-depth study on the damage mechanism and mechanical properties of arch bridge. In this paper, the Natural Science Foundation of Shandong Province: strengthen reinforced concrete rigid frame arch stress mechanism and optimization design theory research (Y2007F58), the main research work, including: (1), 25m, 35m, 45m and 60m four span rigid frame arch bridge standard drawings based on the use of finite element software, in accordance with the overall modeling methods in space the four kinds span arch bridge transverse load distribution coefficient as well as the lateral distribution coefficient along the vertical variation of elastically supported continuous beam Lateral load distribution factors generally small, and the span of the smaller, the greater the error. (2) the application of finite element software, consider the five kinds of new and old norms vehicle load rating, in accordance with the overall space plane analysis method, the study investigated different load levels on the mechanical properties of rigid frame arch. The calculation results show that the different methods of analysis of the rigid frame arch bridge internal force calculation results of different cross-section greater impact, the cross-section plane modeling positive moment is small, and the cross section of the arch of the foot is too large negative moment. (3) the existing span 35m arch bridge arch slice spacing 0.8 times reduction arch piece spacing force performance rigid frame arch investigated. The calculation results show that the the arch piece spacing decreases, the lateral distribution coefficient and the elastic support of continuous beam close to major sectional internal forces and deflections are greatly reduced. (4) to the car - super 20 car column 55t heavy vehicles loaded vehicle, using spatial finite element analysis method as a standard, overweight transport system level impact of the law by the force of the performance of different span rigid frame arch. The results show that, under overweight vehicles, rigid frame arch bridge the major sectional internal forces and deflections were linear growth. (5) to the car - the ultra-55t heavy car 20 car column load standard vehicle system to study the mechanism of cracking of the size of the nodes of the rigid frame arch, on this basis, the proposed internal heterosexual steel plate to strengthen the node technology and analysis influence of factors such as the number of built-in steel plate, the thickness of steel plate and steel plate hollowed rate of node cracking stress.

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CLC: > Transportation > Road transport > Bridges and Culverts > All kinds of bridges > Bridge: Structure > Arch bridge
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