Study On The Flexural Property Of Composite Component Of Double Beams Clipping Wall

Frame Structure System of Double Reinforced Concrete Beam and Wide Column as a new concept in system transformation, has been being widely used in the old underpinning reconstruction. It can be widely used in masonry structure and concrete structure reform of the residential, hotel, hospital, etc, especially suitable for small space into a large space of old building reconstruction.During masonry buildings underpinning processing, the wall clipped inside double beams is not easy to dismantled, the reasonable design connections, can guarantee the double beam and not dismantled the wall work together. Although many scholars have studied the mechanical performance of the wall beam, and proposed the relevant design suggestions, but the mechanical characteristics of component of double beams clipping wall, no attention to the scholars both at home and abroad. Reasonable considering the contribution of the wall to the bearing capacity will directly affect the ductility design of "strong column weak beam" and "strong shear weak bending" method. Therefore, it is necessary for frame structure system of double reinforced concrete beam and wide column, especially composite component of double beams clipping wall study on the bearing capacity of components.Based on the national natural science fund project Research on Flame Structure System of Double Reinforced Concrete Beam and Wide Column in the Old Masonry Underpinning Reconstruction, combined members of reinforced concrete underpinning beam brick masonry structures of seven different combinations and different connection spacings are designed and produced. One root of reinforced concrete beam as the contrast beam;3single underpinning beam combination components, used to observe part of masonry cracks occur development condition, the deformation coordination of work;3pairs of underpinning beam combination, for flexural performance research.This paper around the brick masonry wall affected on the composite component of double beams clipping wall, main work is as follows: 1. Single flexural performance research underpinning beam combination components, including:failure mode, the cracking moment, on both sides of the form and development regularity of cracks, the stiffness characteristics of ultimate bending moment, etc, and compared with reinforced concrete beams;2. The dual combination of underpinning beam component of the bending performance study, including:failure mode, the cracking moment, form and development regularity of cracks, the stiffness characteristics, ultimate bending moment, etc., and with reinforced concrete beams were compared with single underpinning beam combination;3. Study on combined component of the load-deflection curve, and compared with reinforced concrete beams, analyze combined member ductility performance;4. Analyze the static load test results, research on the brick masonry wall affected on the composite component of double beams clipping wall, set up bearing capacity calculation formula of composite component of double beams clipping wall.Research results show that the failure mode of the composite component and the load-deflection curve, the development regularity of cracks are similar to those of reinforced concrete beam; Bearing capacity has a certain contributions of brick masonry, connection reinforced brick masonry and concrete is the main purpose of deformation coordination to work together; Combined member ductility performance can satisfy the seismic basic requirements; In this paper, the ultimate bearing capacity of calculation are in good agreement with the actual result.