How to consider the influence of non load bearing wall stiffness on the self seismic period of high

The ductility of a structure, member, or section refers to the deformation capacity from the beginning of yield to the time when the maximum bearing capacity is reached or after it is reached without a significant decrease in the bearing capacity, that is, ductility is a reflection of the later deformation capacity of the structure, component, or section.

Structures, components or cross-sections with poor ductility have a small deformation capacity in the later stage, and brittle failure will occur suddenly after reaching their maximum bearing capacity, which should be avoided. Therefore, in the design of engineering structures, it is necessary not only to meet the requirements of bearing capacity, but also to meet certain ductility requirements, the purpose of which is:

1) It is conducive to absorbing and dissipating ** energy and meeting the requirements of seismic design. For the structure with seismic fortification, the seismic performance mainly depends on the energy that the structure can absorb, which is equal to the product of the bearing capacity and deformation capacity of the structure, that is, the seismic capacity of the structure is determined by the bearing capacity and deformation capacity. Therefore, in seismic design, the deformation capacity (ductility) of the structure and the ability to dissipate ** energy should be considered and utilized.

A large number of research results have shown that if a structure has greater ductility or higher energy dissipation capacity, even if the bearing capacity is low, it can absorb more energy and resist more than collapse.

2) Prevent brittle damage.

3) In the ultra-static structure, it can better adapt to the special conditions such as uneven settlement of the foundation and temperature changes.

4) The super-statically determined structure can fully redistribute the internal force, which is convenient for construction and saves steel.

If you don't think about it, it's not as holistic as possible. How much does the embedding of the structural reinforcement at that point affect the stiffness of the main structure? I didn't mention the national standard.

Talk about the problems that need to be paid attention to in the seismic design of building structures: The problems that need to be paid attention to in the seismic design of building structures are the lack of geotechnical engineering investigation data or incomplete data, the lack of geotechnical engineering investigation data or incomplete data. Some of them lack the survey data of the geotechnical engineering of the building site in the initial design stage, some directly enter the construction drawing design after the preliminary design review, and some are in the planning design.

The layout of the structure. The shape is irregular, the concave and convex change scale is large, the centroid of mass is eccentric, the shape and stiffness of the structural plane are uneven and asymmetrical, and the plane length is too long. Two different structural stress systems are used in one structural unit.

For example, half of the masonry is load-bearing, and the other half or part of the whole frame or row frame is load-bearing; Half of the bottom frame brick house is the bottom frame, while the other half is the brick wall. Improper grasp of seismic fortification standards. There are some projects that have raised fortification standards without authorization, which will increase engineering investment; Some projects have reduced the seismic fortification standards, which is not conducive to seismic safety.

Vertical arrangement of the structure. In high-rise building, the vertical body shape has too much overhang and adduction, and the size ratio of façade retracting part B1 B does not meet the requirement.

The displacement and deformation characteristics of high-rise building structures under horizontal load increase with height, and different structural types perform differently: the displacement curve characteristics of frame structures change from bending-dominated bending-shear to shear-bending;

The displacement curve shape characteristics of seismic wall structure change from shear-bending type to bending-shear type. However, the displacement and deformation curves of the frame-seismic wall structure are relatively moderate and stable.