## 1 Introduction  
As cities and towns widely adopt structural designs, in which large spaces are present at the bottom part of the frontage building, experiments that focus on earthquake damage have been conducted on large scales [1; 2; 3]. The results indicate that as the frame-supported masonry structure enters the yielding stage, the load-bearing wall absorbs the majority of the seismic energy. Although the structural columns and ring beams help mitigate earthquake damage to a certain degree, the brittle material that is applied may induce a sudden change in internal force, which, in turn, weakens the structure as a whole. Severe damage then occurs, as frame-supported columns (FS columns) collapse and frame-supported beams (FS beams) begin to crack slightly. In other words, the masonry structure at this point fails to deliver the design scheme, in which strong columns support yet-so-strong beams.  
In addition, it must to be pointed out that as the country works to design better large-bay residences, the materials that are selected for manufacturing load-bearing walls (porous bricks and masonry blocks, for instance) tend to be underused because adjustments are still needed with respect to the distribution of force and stiffness at key areas. Simultaneously, widely applied clay-brick masonry has been found to be harmful to the adjacent farmland, which strains resources and undermines environmental-protection efforts [4; 5]. In comparison, frame-supported shear wall structures use a design scheme, in which the upper part is relatively stronger than the lower part. Therefore, under lateral seismic influence, the shear wall begins to crack diagonally. As the structure reaches its loading limit, a drop in stiffness is noticed, while deformation largely accumulates in the lower part, which is the primary location for the build-up of seismic energy. In addition to the enormous amounts of required materials, the complex construction procedure and high cost of building has prevented this method from reaching underdeveloped areas of the country, not to mention small- and medium-sized cities and towns [6; 7]. With the above-mentioned points in mind, we believe that a clear, correct, and quantified grasp of damage mechanisms is the key to the seismic stability of structures with interim layers.  
On this basis, we suggest a concealed multi-ribbed (CMR) wall panel with energy-efficient embedded blocks be used in the construction of buildings with large spaces in the bottom. This will help create a new structural system: a frame-supported concealed multi-ribbed (FSCMR) wall panel structure with energy-efficient blocks. Based on the progress made in the current stage, we took a performance-oriented approach to studying the CMR wall unit. The experimental data have allowed us to quantify damage-resistance performance and determine an approximate method for damage analysis under seismic influence. In the meantime, focusing on the damage mitigation unit for the CMR panel, we have investigated the panel failure process, as well as the split ratio of energy consumption, which has proven to be helpful in the study of the collapse resistance of the overall structure [8]. Despite the academic accomplishments achieved in the damage evaluation of the panel unit and its main components, FSCMR wall panel structures remain an overlooked subject [9]. Considering this, the study imposes low-reversed cyclic loading on the structure and analyses the mechanisms of the accumulative damage that follows. It aims to identify the damage model accordingly and unveil the rules for damage evaluation, in order to facilitate the future seismic design and evaluation of the FSCMR wall panel.