Calculation of combined reinforced concrete structures - PZ, KZh

Contents

Part I. Calculation of precast reinforced concrete structures

1. General Source Data

2. Building layout of prefabricated reinforced concrete structures

Drawing up of the slab installation plan

3. Calculating a Ribbed Panel

3.1. Assignment of concrete and reinforcement strength characteristics, height determination

panels

3.2. To Calculate a Panel Longitudinal Edge from Normal Sections

3.3. Calculation of panel shelf on local bend

3.4. To Calculate a Longitudinal Panel Edge from Slanted Sections

3.5. Calculation of crack opening normal to longitudinal axis of rib

3.6. Panel Deflection Definitions

3.7. Check panel strength on loads acting during

transportation and installation

3.8. Determining the Diameter of Lifting Loops

4. Calculation of non-cut girder

4.1. Purpose of section dimensions and strength characteristics of concrete and reinforcement

4.2. Collection of loads per 1 m of girder

4.3. Calculation Scheme Selection and Static Crossbar Calculation

4.4. Calculation of strength of normal sections

4.5. Calculation of strength of inclined sections

4.6. To Create a Material Symbol

5. Column Calculation

5.1. Source Data

5.2. Load collection, calculation diagram, force determination

5.3. Selection of concrete and reinforcement sections

5.4. Column Joint Calculation

5.5. Calculation of the console

6. Calculation of centrally loaded foundation

6.1. Source Data

6.2. Sizing the Foundation Floor

6.3. Purpose of foundation height and step dimensions

6.4. Check the strength of the lower stage of the foundation for pressing and cutting

6.5. Calculation of Foundation Floor Reinforcement

Part II. Calculation of cast-in-situ reinforced concrete structures

7. Monolithic ribbed floor with beam slabs

7.1. Source Data

7.2. Floor Layout

7.3. Plate calculation

7.4. Calculation of secondary beam

List of literature

Design Input

For course design for reinforced concrete structures

Task topic: "Design of precast reinforced concrete

multi-storey building elements "

The following shall be calculated and constructed:

1. Ribbed slab

2. Crossbar

3. First floor middle row column

4. Foundation for middle column

Source Data

1. Building length in axes - 8x5 = 40 m

2. Building width in axes of 3х6=18 m

3. Number of floors - 4

4. Height of I floor H, m - 3.9 m

5. Height of subsequent floors N, m - 3.9 m

6. Normative loads on ceilings:

a) temporary long-acting -10.0 kN/m2

b) temporary short-term - 1.5 kN/m2

c) floor weight - 1.0 kN/m2

5. Design base resistance 0.35 MPa

7. Foundation depth h, - 1.5 m

8. Type of constructs:

a) panels - ribbed;

b) girders - rectangular cross-section

9. Concrete and steel class as selected

Part I. Calculation of precast reinforced concrete structures

1. General Source Data

It is required to calculate reinforced concrete structures of four storey industrial building with external brick walls 510 mm thick, having a rigid structural diagram, with the following initial data.

The dimensions of the building in plan, counting according to the layout axes 40x18 m. The girders of the beam prefabricated floor of the building with an incomplete frame consist of separate single-span elements, which are combined during installation into a continuous system. Ends of rectangular section girders rest freely on longitudinal walls.

Intermediate floors are made of ribbed panels with ribs down, which are laid on the surface along the girders. The height of the first and subsequent floors is 3.9 m. The cover of the building rests only on the external walls. Temporary long-acting load, temporary short-acting load, weight of floor is, design soil resistance, depth of foundation laying under columns is 1.5 m. Concrete working conditions factor, which takes into account the influence of load duration, is assumed to be equal to 0.9. The building belongs to the II normal level of responsibility, for which, when calculating, the safety factor for responsibility is taken equal to [2, p. 34].

Monolithic ribbed floor with beam slabs

7.1.The initial data

It is required to design a ribbed floor for a building with plan dimensions of 40x18 m (in axes), supported by external brick walls with a thickness of 510 mm and internal reinforced concrete columns, and consisting of a slab, secondary and main beams. Binding of inner surfaces of longitudinal and transverse walls to layout axes - 200 mm.

Temporary the operating standard load of interfloor overlapping Rdln =10.0 kN/sq.m, short-term Rkrn =1.5kn/sq.m, floor weight - gpn = 1.0 kN/sq.m are long. Reliability factor for the purpose of the building αp = 0.95.

We design a floor from heavy concrete of class B15 (Rb = 8.5 MPa, Rbt = 0.75 MPa, οb2 = 0.9, Eb = 24000 MPa); We accept reinforcement of grids for reinforcement of plates made of ordinary cold-tensioned wire of class B500 (Bp1) with diameter 3... 5 mm, design tension resistance of which is taken equal to 415 MPa or rods of periodic profile of class A400 (Rs = 355 MPa); longitudinal working reinforcement of secondary beams is accepted from steel of class A400 (Rs = 355 MPa), transverse rods - from reinforcement of class A240 (Rs = 170 MPa, Es = 200000 MPa).

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