The existing regulatory approaches to design do not allow us to take into account the contribution of preventive design measures and design solutions to the reliability of the design. In certain cases, the risk assessment can be considered as a confirmation of the adequacy of engineering solutions used in the project to protect against progressive collapse. In the domestic and foreign regulatory framework, there are several normative documents that establish the rules for calculating the reliability of technical objects, requirements for methods, the procedure for presenting results, and defining fundamental approaches to analyzing the types, consequences, and criticality of failures of technical objects. In order to form a complete and developed system of regulatory documents, it is necessary to develop and implement a regulatory methodology for assessing the risk of failure of building structures, including working under special influences. The article considers a point-based system for determining the risk of structural failure, taking into account the features of various structural schemes of buildings, the possibility of several negative events.

The article provides a brief analysis of codes on calculations of compressed steel rods in Russia, EU, USA, PRC. It is established that Russian codes need to be clarified due to the appearance in recent years of new steels and cross-sections, for example, “heavy" I-beams and pipes made of steel with a yield strength of up to 600 MPa. It is shown that tests of H-beams made of high-strength steels correlate well with Russian code calculation for eccentrical compression - the discrepancy of no more than 10%. The smallest margin of 1.1% corresponds to rods whose eccentricity is applied in a plane of weak axes. The small load-bearing capacity reserve should be clarified by studying the residual stresses. Tests of pipes show that Russian codes do not take into account thinness, diagram of steel, weld, member work as a shell. Standard calculation deviations from tests are up to 30% for pipes with D/t=95. Ways to improve the calculations of centrally and eccentric compressed rods based on tests over the past 100years are identified. It is shown that the coefficient of longitudinal bending should take into account: the "thinness" of box and tube sections, initial imperfections in the form of local threads, the type of I-beam profile, as well as the method of their manufacture (welded or rolled).

The review of the elements of openings filling in fire barriers - doors, hatches, gates, curtains, glazed windows and partitions, developed and manufactured presented. The criteria used in the design are given. A brief description of the design of the doors of technical premises, service and office premises, emergency exits, housing (including the entrance to the apartments), special purpose facilities is given. The features of the design that allow ensuring the fulfilment of operational requirements for products in terms of their seismic resistance, explosion safety, tightness, resistance to the action of an air shock wave, resistance to cracking, resistance to the action of decontaminating solutions are considered. A table of the whole range of elements of filling openings in fire barriers, manufactured by the company SPO ‘KrilaK Association', with an indication of the main operating parameters and the function of the product, is given.

Modern pull-out testing devices are not equipped with special grips for connections and periodic profile fittings. A new type of gripper for clutch-gripper testing proposed for the use. Laboratory tests of chemical anchors with periodic profile reinforcement, using new types of gripper (coupling-gripper), carried out. A comparative analysis of the obtained results performed about anchors tests, using four types of grips. Suggestions given for the use of grippers during field tests and in the laboratory.

System of large-block housing construction based on domestic developments and researches of new types of connection for wooden structures proposed in TsNIISK named after V. A. Koucherenko. It focused on more efficient use of production facilities without attracting imports. This system will form an additional reserve in the field of low-rise and multi-storied frame construction. The implementation of the system will require additional research to confirm the technical solutions incorporated in the building designs. When mastering the technology, the existing regulatory framework for glued wooden structures can be used.

The article is devoted to the influence of situational characteristics on the implementation of a capital construction project. Options for optimal construction management analyzed.

Determination of the most effective compression test methods for ceramic masonry products was the aim of investigation. It is necessary to clarify the testing methodology for hollow ceramic masonry products made by plastic molding, having cavities, saggings, voids on the loaded (supporting) surface. It is required to compare the results obtained with the data of foreign standards and recommend using the obtained results in domestic standards to harmonize them with European ones. The methods of testing for compression of ceramic bricks of plastic formation with three types of preparation of loaded surfaces, used in the current standard GOST8462, investigated. Statistical data on the strength of bricks obtained during tests using gaskets between the press and the brick surface made of technical felt, with preliminary grinding of the supporting surfaces, as well as using cement mortar. Based on the results obtained, recommendations for testing given, taking into account international experience.

The article is devoted to the description of load-bearing truss structures of coverings and overlappings of steel beams with a perforated wall. One of the main ways to increase the efficiency of beam structures is to ‘disband’ rolled I-beams along different cutting paths of the I-beam wall. The results of ‘dissolution’of the I-beam formed of two combs with the form of the t-section is then formed beam crosssection greater height and subsequent welding of dies into a single structure - I-beam with a perforated wall. The cross-section height of a through I-beam with a perforated wall becomes higher than the original I-beam from 1.2 to 1.6 times, which significantly increases the moment of inertia and the moment of resistance relative to the original profile

The differential seismic ground motion described by a vector field of kinematic parameters given at each point of the soil base. In seismic structural analyses, the differential ground motions taken into account in the cases where two factors are simultaneously combined: 1) in the seismic action spectrum, short waves (with small lengths in comparison to the size of the foundation) prevail; 2) the building or structure has a flexible foundation or discrete supports. The paper presents a method for structural analysis by Response Spectrum Method (RSM) for spatial differential seismic ground motion given by accelerograms. Formulae for modal seismic load obtained, and there are formulae for critical directions of seismic action. The analysis features to calculate the parameters of the seismic action discussed, if the seismic action given by accelerograms at the support points, and recommendations are present for a simplified approach when there is no information about the spatial distribution of accelerations and amplification factors.

Articulated and rigid knots of fastening of wooden elements with end surfaces to the base tested for shear. Fragments with V-shaped anchors glued into the end surface were tested. Bending console with a rigid knot tested. A rigid knot made with the obliquely glued-in rods. Constructions with the rigid knots used in some structures. High shear strength of the knot confirmed.

The article presents a method for monitoring the technical condition of structures carried out at two unique sites in Moscow - the coating of the Large sports arena in Luzhniki and the spacer system of the pit of the hotel under construction near the Kursky railway station. Unique buildings and structures, including high-rise and long-span ones, are subject to technical condition monitoring to ensure their safe operation. Monitoring used to track the degree, speed and timely detection of negative changes in the stress-strain state of non-existing structures of buildings and structures at an early stage, as well as to take, if necessary, emergency measures to prevent disasters associated with their collapse. For safe operation of structures, the monitoring system must function throughout the entire service life.

The article presents various types of membrane coatings made of solid and intertwined tapes, also depending on the type of surface (zero, positive, negative Gaussian curvature). Possible types of stabilization of membrane coatings from wind "suction" and non-equilibrium loads are considered. Examples of constructed membrane coatings are given. The materials used for the manufacture of membranes are described. The reasons for the collapse of the membrane coating of the CCM ‘Petrovsky’ in St. Petersburg were investigated. Advantages of membrane coatings in comparison with traditional types of steel frames are shown.

The article is devoted to the consideration of the basic methods of scientific knowledge. The leading role in providing science with methods belongs to philosophy. The classification of methods, which proposed here, allows using them in scientific study correctly. The contents and specificities of using these methods in practice also reveal.