This mode enables to calculate the deflections at the bending of a multi-span beam under a given load. The deflections are calculated for a rectangular section, T-section or I-section in compliance with Sec. 4.31 of SNiP 2.03.01-84*, KMK 2.03.01-96 (Sec. 7.3.4 of SP 52-101-2003, Sec. 8.2.21 of SP 63.13330). The curvature is determined taking into account cracks in the tension area according to Sec. 4.27 of SNiP 2.03.01-84*, KMK 2.03.01-96 (Sec. 7.3.7 of SP 52-101-2003, Sec. 8.2.24 of SP 63.13330). Initial data are prepared in the General, Loads, Concrete, Conditions of Operation, and Segments tabs, and results of the calculation are analyzed in the Deflections tab which opens once the calculation is performed (the Calculate button).
You can switch from the check and reinforcement selection modes for multi-span beams to the deflection mode. In this case the initial data specified in these modes will be transferred automatically.
The General tab is used to specify the number and lengths of the spans, the class and service factors for longitudinal and transverse reinforcement, the type and sizes of the section and the thickness of the concrete cover.
The button 
invokes
the dialog box, which provides the design properties of the material.
The Design situation drop-down
list enables to select the type of analysis (ultimate limit state, serviceability
limit state,...) in order to display the respective parameters.
You also have to select (or enter) the maximum value of the ratio of the maximal deflection to the span length.
This tab is similar to the respective tab of the Beam Check mode.
The deflections are calculated for a single permanent load case that may include concentrated and distributed loads. The loads are specified in the respective tab, which is similar to the Loads tab of the Beam Check mode. The only difference is that since the analysis is nonlinear (it allows for the effect of cracks on the curvature), it is performed only for one load case.
To delete all loads, use the Delete button.
Properties of concrete are specified in the Concrete tab in the standard way.
Data on the conditions of operation are specified in the Conditions of Operation tab according to the standard rules.
Segments of the beam are described in the respective tab according to the same rules as for the Beam Check mode.
This tab opens automatically once the calculation mode is activated (the Calculate button). Results of the analysis will be displayed as a diagram or as a table (the Table button). The value of the maximum deflection is specified in the respective field. A report can be generated on the basis of the results of the calculation (the Report button).
You can switch to the check mode by clicking the Beam Check button. All the data on the section, reinforcement and loads will be saved.
SNiP 2.03.01-84* (see Sec. 4.32-4.33) provides clear recommendations for taking into account the effect of shear forces on deflection. Other standards, for example, Sec. 8.2.21 of SP 63.13330, contain only the requirement to take into account shear angles without any specific instructions on how to determine them. Therefore, the shear is taken into account in the deflection analysis according to the recommendations of SNiP 2.03.01-84*.