Analysis Of Factors Affecting Seismic Performance Of X-shaped Diagonally Braced Foam Concrete Wall Panels

The traditional wall panels commonly used in residential buildings have problems such as high self-weight,low load-bearing capacity and weak seismic performance,while filling foam concrete,built-in X-shaped diagonal bracing and setting shaped columns provide a new way to solve the above problems.This paper studies a new type of assembled foam concrete wall panel,which has built-in X-shaped diagonal brace,and its edge beam and precast floor slab are combined into a stacked beam by post-casting concrete;the edge column and structural column are combined into different shaped shaped columns;the stacked beam and shaped column are combined into an assembled monolithic shaped column frame structure.This new type of assembled wall panel not only reduces the self-weight due to the filling of foam concrete,but also the members can work together and have better load-bearing capacity and seismic resistance.In this paper,the damage mechanism,load-bearing capacity and seismic performance of X-shaped diagonal braced foam concrete wall panel are studied by using proposed static test research and ABAQUS finite element simulation analysis.The main research contents and results are as follows:(1)Two 1/2 scale scaled wall panel specimens FR-1(without additional laminated beams and profiled columns)and FR-2(with additional laminated beams and T-shaped profiled columns)were fabricated,and the proposed static force tests were conducted on the two wall panel specimens FR-1 and FR-2 by applying horizontal low circumferential reciprocal loads,observing the damage of the specimens at each stage and recording them.From the test data,the stiffness,bearing capacity and ductility of the specimens were analyzed,and it was found that the wall panels were shear damaged,and the sequence of"foam concrete-diagonal brace-beam-column outer frame"was progressive,showing multiple seismic lines of defense.Comparison with FR-1 wall slab,FR-2 wall slab with T-shaped column frame structure has a significant effect on the improvement of bearing capacity and ductility of wall slab,and has better seismic performance.(2)The seismic performance of the two wall panels was analyzed by comparing the experimental and simulated results by observing their hysteresis curves,skeleton curves,bearing capacity and ductility coefficients,stiffness degradation and other indices using ABAQUS finite element software as the prototype of the tested FR-1 and FR-2 wall panel members.The results show that the damage patterns and related curves of the test and simulation are in good agreement,and the errors of each eigenvalue data are within the allowed range,and the seismic performance of this kind of wall panel meets the requirements of engineering applications.(3)Six models were established using ABAQUS finite element simulation software to compare and study the effects of three factors on the seismic performance of the X-shaped diagonal braced foam concrete wall slab,namely,the diameter of the longitudinal reinforcement of the T-shaped shaped column,the spacing of the hoop reinforcement of the T-shaped shaped column,and the height of the post-cast beam of the wall slab.Analysis of the stress cloud diagram,skeleton curve and bearing capacity of the model shows that appropriately reducing the longitudinal bar diameter of Tshaped column,increasing the hoop spacing of T-shaped column and increasing the height of back-cast beam can help to improve the seismic performance of this type of X-shaped diagonally braced foam concrete wall slab.For the wall slab model studied in this paper,it is clarified that the design combination of T-shaped column longitudinal reinforcement diameter of 8,hoop spacing of 50 mm in the encrypted area of column top and column footing,100 mm in the non-encrypted area of column middle,and 100 mm in the height of post-cast beam can make the optimal seismic performance of this kind of wall slab.