Structures of pedestrian underpasses and overpasses under seismic conditions

International Conference on Construction, Architecture and Technosphere Safety 2018

土木建筑工程

Alimardonov, A.M.^1 ; Zardakov, S.H.^1

Departments of Underground Structures Bases and Foundations, Tajik Technical University, Rajabov Academicians street, 10, Dushanbe

734042, Tajikistan^1

关键词: Arched structures;    Beam structures;    Damageability;    Dynamic stiffness;    Reinforcement ratios;    Seismic condition;    Seismic forces;    Stretching force;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/451/1/012068/pdf
DOI  :  10.1088/1757-899X/451/1/012068

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

In this article, on the basis of analyzing damages of pedestrian passes during earthquakes that caused injuries or death of people, structural designs of these structures in order to enhance their stability are elaborated, and actions for reduction of their damageability degree are proposed. The essence of the invention lies in the fact that operation of arched ceilings is in reduction of reinforcement ratio, enhancement of dynamic stiffness, and reduction of seismically active earth thrust due to reduction of thrust force. The proposed structure operates in compression, which allows diminishing the thickness of concrete, due to which inertial seismic forces are reducing. In this structure, foundation is combined with the floor and transmits the thrust force from wall panels to the arched floor. Strategically, arched structures are better than beam structures, as their sections are mainly operating for off-center compression; at that, stretching forces caused by bending moments are insignificant, whereas bending moments occurring in beam structures cause essential stretching.