Study On Seismic Performance Of The Self-insulating Structural Wall With Inner Frame

With the trend of building energy efficiency the solid clay gradually elapses out of the building materials market, the concrete hollow block is in more and more widely used, especially playing an increasingly large proportion in rural areas. Own to the complex mechanical characteristics and its utilization confined to low-rise rural buildings, the theoretical research, experimental research and the numerical analysis do not get due attention to, resulting in a certain lagging behind other structures. However lots of rural buildings collapsed in the previous earthquake (Wenchuan earthquake, Yushu earthquake, Lushan earthquakes, etc.), causing serious casualties and property losses, even the minor earthquakes can lead to great disasters. It is to say that rural buildings have become one of the weakest links in the seismic fortification of our country.From the perspective of the integration of better seismic performance and energy efficiency, the study on seismic performance of self-insulating structural wall with inner frame is carried out. Firstly, the numerical simulation for the walls fracture process of the block masonry walls subjected to compressive and lateral loads is raised by adopting the combined modelling method and the cohesive surface Moore-Coulomb friction model, in which the bonding strength, damage and slip between the interfaces are considered. The loading application system is established and three iterative algorithms are proposed and selected. Main factors related with the shear strengthes and damage patterns, including aspect ratios, compressive loads and the mortar strengthes, are analyzed. Moreover the numerical simulation is contrast with building damages in earthquake. The simulation can accurately reflect the crack initiation, propagation until rupture through the whole wall, and the results agree well with the seismic building damages.Secondly, from the perspective of the sub-structure seismic performance, based on the assumption of rigid floor some key problems are discussed, including the modeling of the masonry, constitutive relations of concrete block masonry, the loading application system, damage evaluation and dynamic response. The elasto-plastic time history analysis is carried out on three different type walls with openings. Some key factors, such as the details of seismic design, which have great influence on the damage pattern, are discussed in details. The conclusion can provide a reference for performance-based seismic design of the structure.Moreover, from the perspective of the structure dynamic behavior and seismic performance, the dynamic characteristics of one-story masonry structure is measured by means of pulsatile test. The results show that the first natural period of the structure is in the ascent segment of the design response spectrum, rather than the platforms segment, significantly different from that of RC frame structure and high-rise building. Based on the practical structure, three dimensional finite element model is established and its structural modes are extracted by the subspace method. The difference between experimental and numerical results is within the error range and the structural modes are similar. Based on dynamic characteristics, extended analysis is carried out to discuss the influence of seismic details on the dynamic characteristics of the structure. Moreover response spectrum analysis and elasto-plastic time-history analysis are carried out to evaluate the seismic performance of the structure.Finally, based on above studies the numerical model for multi-story concrete block masonry with inner frame is established by numerical optimization and the modes are extracted in order to understand the dynamic characteristics. The concrete damaged plasticity model is adopted and dynamic response analysis is analyzed by the input of the round motions. The sensitivity analysis of some key factors, including core columns and horizontal banding, the ground motion intensity, multi-dimensional ground motion, seismic torsional effects is put forward. Moreover the pushover analysis is proposed, and structural failure modes are compared and analyzed.This paper is financially supported by Shandong Province Science and Technology Development Program (2012GNC11401), great acknowledgment owed to. Numerical analysis methods are proposed for the components, the sub-structure and the structure, which can provide numerical models and theoretical basis for the afterwards quasi-static loading test, real-time substructure pseudo-dynamic test and shaking table test.