Introduction -- Optimum Design of Castellated Beams Using Tug of War Algorithm -- Optimum Design of Multi-Span Composite Box Girder Bridges Using Cuckoo Search Algorithm -- Sizing Optimization of Skeletal Structures Using Enhanced Whale Optimization Algorithm -- Size and Geometry Optimization of Double Layer Grids Using Colliding Body Optimization (CBO) and Enhanced Colliding Body Optimization (ECBO) Algorithms -- Sizing and Geometry Optimization of Different Mechanical System of Domes via ECBO Algorithm -- Optimal Design of Double Layer Barrel Vaults Using CBO and ECBO Algorithms -- Optimum Design of Steel Floor System Using ECBO -- Optimal design of the monopole structures using CBO and ECBO algorithms -- Damage Detection in Skeletal Structures Based on Charged System Search Optimization Using Incomplete Modal Data -- Enhanced Colliding Bodies Optimization for Modification of Ground Motions -- Bandwidth, Profile and Wavefront Optimization Using PSO, CBO, ECBO and TWO Algorithms -- Optimal Analysis and Design of Large-Scale Domes with Frequency Constraints -- Cost and CO2 Emission Optimization of Reinforced Concrete Frames Using ECBO Algorithm -- Construction Site Layout Planning Problem Using CBO and ECBO.