1.1.The shaping process and its development 1.2.Modern digital tools for shaping 1.3.Parametric modeling and algorithmic-aided shaping 2.State of art and objectives of the monograph 2.1.State of art 2.2.Aims of the monograph 2.3.Description of shaping tools and methodology 3.Rational shaping of curvilinear steel bar structures 3.1.Systematics of steel bar structures and their basie shaping criteria 3.2.Geometric-structural and functional shaping criteria 3.2.1.General rules 3.2.2.Surface discretization 3.3.Static-strength and stability criteria 3.3.1.General rules 3.3.2.Loads acting on the structure 3.3.3.Ultimate Limit States (ULS) and load combinations 3.3.4.Serviceability Limit States (SLS) and load combinations 3.3.5.Structural nodes of shaped structures 3.4.Technological and materiał criteria 3.5.Structural optimization 3.5.1.General rules 3.5.2.Optimization of grid shells 3.6.Structural analysis 4.Shaping curvilinear steel bar structures (grid shells) based on ruled surfaces 4.1.Geometrie properties of Catalan surfaces 4.2.Geometrie modeling of Catalan surfaces by Grasshopper scripts 4.3.Alorithmic-aided shaping of single-shell canopy roofs 4.3.1.Case study 1 4.3.2.Case study 2 4.3.3.Case study 3 5.Shaping grid shell structures basing on minimal surfaces 5.1. Shaping steel bar structures basing on Enneper surfaces 5.1.1.Assumption of grid topology 5.1.2.Optimization of the steel bar structure due to structural analysis 5.2. Shaping steel bar structures basing on the minimal surfaces defined by two pairs of arcs 5.2.1.The steel bar structure based on a single-shell surface 5.2.2.The steel bar structure based on a multi-shell surface 5.3. Shaping steel bar structures basing on free-form minimal surfaces 6.Performance based shaping structures 6.1.Form-finding 6.2.Case study 1 - form-finding of the canopy roof due to dynamie relaxation 6.3.Case study 2 - form-finding of the canopy roof due to dynamie relaxation