Multi-ribbed Wall Research Articles

Structural optimization design of multi ribbed composite wall of building components under seismic load based on random optimization algorithm and resilience model

The multi ribbed composite wall structure is also known as the multi ribbed wall panel light frame structure. This structure is suitable for housing construction in the residential field. The special structural failure process and mode of multi ribbed composite walls are different from traditional walls. To fully utilize the excellent structural performance in building construction and improve the seismic performance of the building, based on the transformation principle of subset optimization algorithm for optimization problems, a constrained subset simulation optimization algorithm suitable for optimizing the maximum displacement angle of multi ribbed composite wall panels is designed. The Bayesian algorithm is used to construct a restoring force model for multi ribbed composite wall panels. The constrained subset simulation optimization algorithm and resilience model are used to optimize the seismic performance of 4-layer multi ribbed composite wall panels. The results show that the section height and the equivalent slant support width of the continuous column for the 4-story multi ribbed composite wall panel change from discrete distribution to aggregation with the increase of iteration. Finally, the sampling is stable in the 9th floor. At this time, the section height of the continuous column is 230 mm, and the equivalent slant support width is 525. After optimization, the failure probability of both extreme displacement angle states has decreased. When the peak ground acceleration is 1.0 g, the optimized second limit state failure probability is less than 100%. When the peak ground acceleration value is between 0.2 g and 0.6 g, both limit states show a rapid upward trend. The constrained subset simulation optimization algorithm and Bayesian quantitative resilience model proposed in the research can effectively optimize the seismic performance of multi ribbed composite walls.

Calculating the rigid frame diagonal strut for Multi-ribbed composite wall

Multi-ribbed wall plate with lightweight frame structure is a new structural system that the weight is light, the rigidity is big, the anti-seismic capacity and the effect of saving energy are good, the social benefit is high, green and environment p

Damage Index Calibration of Frame-Supported Concealed Multi-Ribbed Wall Panels with Energy-Efficient Blocks

In this paper, we carry out low-reversed cyclic loading tests on differently-structured frame-supported concealed multi-ribbed wall panels with energy-efficient blocks. Models for evaluating damage performance are introduced for comparative study, in an effort to identify the preferable model for such a structure. To this end, the paper uses OpenSees, a nonlinear finite element software that can accurately depict the mechanical performance of a structure, both to calculate the necessary mechanical parameters and to verify the damage model of interest. In this paper, we determine the numerical ranges for the damage index at different stages of accumulative damage, attaching detailed descriptions on a stage-by-stage basis. Then, we offer suggestions for structure restoration according to these indices.

Damage analysis of multi-ribbed wall structures under monotonic lateral loads

Multi-ribbed Wall Structures (MRWS) have been developed in recent years and has been increasingly used in China. However, there is no effective way to quantitatively assess the damage of MRWS subjected to lateral load yet. In this paper, a macro-damage model of MRWS is developed based on the damage theory. First, two types of elements, including fiber rigid frame and bar elements, are introduced to take into account material damage, and local damage index (LDI) is proposed for each type of the elements. Unlike traditional frame element, the innovative fiber rigid frame element can be applied for both axial force and biaxial bending and provides more accurate results. Second, a global damage index (GDI) of structure is derived using the energy theory. Third, the model is implemented in an in-house damage analysis program named MRCS-D, which is further used to experimentally study a MRWS subjected to a combined lateral and vertical loading. There is a good correlation between the numerical and test results. It is shown that the GDI developed in this paper can be effectively used to quantitatively evaluate the damage state and describe the damage progress of the MRWS.

Homogenization-Based Investigation on Equivalent Constitutive Relationship of Multi-Ribbed Slab Wall

Multi-ribbed slab structure (MRSS) is a new structural system developed in recent years, with multi-ribbed slab wall as its main bearing member, which was an orthogonal anisotropic solid constituted by reinforced concrete ribs, frame and embedded solid body. It was suggested to employ asymptotic expansion-based homogenization method to establish the equivalent homogenized model. The method is that it considers the impact of rib relative width and the possion. The research results showed that: the macroscopic constitutive relationship of multi-ribbed wall based by the method has certain accuracy, can provide basis for multi-ribbed slab structure FEM analysis.

Evaluation of elastic properties and lateral stiffness of multi-ribbed walls based on equivalent elastic model

Multi-ribbed wall structure (MRWS) is a new structural system developed in recent years, where multi-ribbed walls are primary load-resistant elements. This paper is focused on evaluation of elastic properties and lateral stiffness of multi-ribbed walls for simplified analysis and design. Based on Mori–Tanaka method, an equivalent elastic model is developed first to predict the elastic properties of multi-ribbed walls and overcomes non-physical order of operation dependencies the other two methods face. An equation to calculate the lateral stiffness of the anisotropic equivalent elastic wall is then developed that is calibrated through a parametric study. The accuracy of the developed method is verified by large-scale tests. The present simplified method provides a valuable basis for designing high-rise multi-ribbed wall structures.

Applications of Muti-Ribbed Walls in the Strengthening of Masonry Structures with Bottom Frame

As a new kind of structures, Multi-ribbed wall structure is now widely used in new-built buildings and old structures needed to be strengthened. In the field of strengthening, Masonry structure with bottom frame is often mentioned for it is vulnerable to earthquake. However, it is still widely applied in China for its agility for arrangement. So how to guarantee the safety of this kind of structure is very important. There are many methods to reinforce this style of structure, but every way has its limitations. Compared with other methods, Multi-ribbed wall structure is more proper, because its stiffness and mass can easily be changed through optimal design of different kinds of materials inside.