The monograph tells about the local methods of strengthening the load-bearing reinforced concrete structures of buildings, the works carried out in foreign countries, as well as about the application of modern composite materials in local construction works and new types of composite materials. The results of applying new, effective methods of strengthening building structures were also presented. At the same time, practical recommendations were developed for restoring the operational reliability of foundations, brick walls, reinforced concrete slabs, columns, beams and steel structures by strengthening them. Great importance is also given to the issues of ensuring the operational reliability of buildings erected and operated in seismic areas.The monograph is intended for engineers and technicians of the enterprises of the construction industry, students of construction fields, undergraduates and doctoral students of construction faculties of technical universities.