Study On Mechanical Behavior Of Longitudinal Reinforcing Rib Composite Wall With Opening Holes Under Vertical Load

As the basic component of building,wall structure often appear in a variety of holes,the openings not only destroys the integrity of the wall structure,but also reduces the vertical bearing capacity of the wall.In this paper,longitudinal reinforcing rib composite wall has been researched,while taking into account the actual situation in the wall with opening hole,and by the ways of experimental study,theoretical analysis and numerical simulation,research the vertical ultimate bearing capacity of the wall.The main research contents and conclusion are summarized as follows:(1)Design and production one piece of the 1/2 ratio composite wall with open the door and one piece of the 1/2 ratio composite wall with open the window for vertical compression test,and compared with one piece of the 1/2 ratio composite wall without opening hole.The failure mode and the strain of the steel bar are researched.The results showed that:Compared with the wall without opening,the damage of the wall with opening mainly begins with the blocks and the ribs near the hole,and when the wall is broken,the damage degree and ultimate bearing capacity are more serious than the wall without opening.(2)Based on the theory of elastic foundation beam,the mechanical model of the Longitudinal Reinforcing Rib Composite Wall is established and the test wall is calculated theoretically.Based on the analysis of the development of force in the wall under the action of vertical load,the formula for calculating the vertical bearing capacity of the Longitudinal Reinforcing Rib Composite Wall is obtained.(3)The finite element model of the test wall is established and compared with the experimental results.Verify the rationality and accuracy of numerical simulation.At the same time,the numerical model of the composite wall with different opening position and opening size are established,and the nonlinear finite element analysis is carried out.The results showed that:When the hole rate exceeds15%,the change of the hole rate is more obvious on the bearing capacity of the wall.A linear regression analysis is made on the hole rate and the bearing capacity reduction rate,the linear relationship between the opening rate and the bearing capacity reduction rate is obtained and the expression of the reduction factor is summarized.