Analysis Of Stiffness And Deformation Of Reinforced Concrete Beams With Openings

With the development and the growing population expansion of science and technology, many high-rise and high-rise buildings appear constantly. Because the increasing functional requirements of the building, it needs a variety of auxiliary and complex facilities. Currently, the pipeline are mostly behind the structural beam in many high-rise buildings. The using of reinforced concrete beams with opening, so that devices pipe through the beam from the hole, thus you can reduce the building space occupied by the pipeline, and increase clear height floor. Under layers of the same premise, it can reduce the weight、the total storey building and the loading effect and the project cost.This paper holds nonlinear simulation test on reinforced concrete beams with opening with ABAQUS finite element software. It focuses on the deflection changes of reinforced concrete beams simply supported with opening under different holes parameters, and extracts the corresponding load-displacement curve and deflection under load change map siblings. It analysis the impact of rigidity of reinforced concrete beams under the factors, for example hole shapes, hole lateral position, longitudinal position of hole, hole size, hole opening rate, strengthening reinforcement of hole, spacing between two holes and strengthening reinforcement around the two holes. It draws a conclusion that is favorable for Beam Stiffness under some reasonable hole parameters,and made practical advice for the design of the beam openings.Through analysis and comparison, it draws the following results:1) In the case of same area, the stiffness of rectangular hole beam is maximum, followed by a circular hole beam, and the stiffness of beam with square hole is minimum.2) the stiffness of the beam which the hole is located in pure bending section is bigger than the stiffness of the beam which the hole is located bending and shearing section. The stiffness of the beam slightly declining trend with the holes move to the loading point from the cross section in pure bending beam segments; when the hole is curved scissors section, to a certain extent, the stiffness of beam increases, away from the loading point and the end of the beam position openings.3) With the center hole gradually tend compression zone, stiffness of the beam will be significantly reduced; with the center hole appropriate bias tension zone, the stiffness of the beam will have greatly improved.4) With the increase of pore size, stiffness openings beam will be significantly reduced.5) With the increase of open porosity, stiffness of openings beam will be slightly downward trend.6) For a smaller diameter beams with openings, performing encryption stirrups around the hole or setting chord longitudinal reinforcement and chord stirrups up and down in the hole are beneficial stiffness of the beam. For a larger diameter beam with openings, the stirrups encryption, slanting steel, chord longitudinal reinforcement and stirrups chord combinations configure around the double holes, the stiffness of beam with openings stiffness is the best.7) two holes’distance has a large effect on the beam stiffness and bearing capacity.8) When the position of two holes in pure bending beam segments, the stirrups encryption, slanting steel, chord longitudinal reinforcement and stirrups chord combinations configure around the double holes, the stiffness of beam with openings stiffness is the best.