Calculation of six-storey frame residential building - Design under special conditions - course

Contents

1. Source Data

2. Design diagram of the building

3. Determination of design seismicity

4. Examination of space-planning and structural solutions of the building

5. Definition of dynamic and rigid characteristics of the building

5.1 Dynamic design diagram of the building

5.2 Determination of level loads

5.3 Practical methods for determining dynamic and stiffness characteristics

6. Determination of seismic load

7. Determination of forces from seismic load and compilation of calculated combinations of forces

7.1 Determination of forces in the diaphragm from horizontal loads

7.2 Determination of forces in the diaphragm from vertical loads

7.3 Compiling of calculated combinations of forces in one diaphragm

8. Constructive antiseismic measures

List of used literature

Design diagram of the building

This explanatory note gives a calculation of the six-story frame residential building, the place of construction - the village. Kavalerovo.

A building with a linked frame. Transverse external walls - bearing, longitudinal - non-bearing. Floor - prefabricated from hollow slabs.

In the transverse and longitudinal direction, the building operates according to a coupling scheme. Spatial rigidity and perception of horizontal loads are provided - in the transverse direction by 3 diaphragms with a thickness of 160 mm, in the longitudinal direction - by 3 diaphragms with a thickness of 160 mm.

Determination of design seismicity

The construction site (Kavalerovo village) according to the map of the total seismic zoning of the territory of the Russian Federation belongs to the district with a seismicity of 7 points. With soils belonging to category II by seismic properties, the seismicity of the construction site does not change and amounts to 7 points.

With calculated seismicity of 7 points, seismicity coefficient A = 0.1

Examination of space-planning and structural solutions of the building

With a design seismicity of 7 points, it is necessary to calculate structures for a special combination of loads taking into account seismic load and provide for a number of structural antiseismic measures.

In this regard, it is necessary to conduct an examination of the volumetric-planning and structural solution of the frame building in accordance with SNiP.

Since the seismicity of the construction site is 7 points in accordance with the SNiP for a building with a reinforced concrete frame (with reinforced concrete diaphragms), its height should not be more than 54 m and the storey should not exceed 16 floors. The space-planning solution chosen in the course project fully meets the SNiP conditions - the height of the building is 18 m, the number of floors is 6.

Examination of the space-planning solution of the building showed that the building solution meets the requirements of the standards.

Definition of dynamic and rigid characteristics of the building

Dynamic design diagram of the building

The calculation of the building for seismic loads must be carried out both in the transverse and longitudinal direction.

The dynamic design scheme is necessary to determine the dynamic characteristics (T _ i, eq _ ik), the tier load Q _ k and the seismic load S _ ik.

8. Constructive antiseismic measures

With a design seismicity of 7 points, it is necessary to calculate structures for a special combination of loads taking into account seismic load and provide for a number of structural antiseismic measures.

In this building, staircases are provided closed with natural lighting through windows in the external walls on each floor.

Diaphragms receiving horizontal load are made continuous along the entire height of the building and are arranged in both directions uniformly and symmetrically relative to the center of gravity of the building. At least two diaphragms located in different planes are installed in each direction.

Slabs and covers are made in the form of rigid horizontal disks located at the same level, reliably connected to vertical structures of the building and providing joint operation under seismic impacts.

In order to ensure separate operation of non-bearing and bearing structures under seismic impacts, the design of wall and diaphragm coupling units eliminates the possibility of transmitting loads acting in their plane to them.