MAURER Earthquake Protection Systems
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MAURER Seismic Protection Systems MAURER Earthquake Protection Systems As unique as the buildings they protect

>> MAURER Earthquake Protection Systems Content Structural Protection Systems Structural Analysis Basic Concepts of Earthquake Protection Hydraulic Coupling and Damping Elements  >> Permanent Restraints (HK; HKE)   >> hock Transmission Unit S (MSTU)   >> hock Transmitter with S Load Limiter (MSTL) Bearing Elements for Base Isolation   >> Elastomeric Isolators   >> Sliding Isolators   >> Hydraulic Dampers (MHD) Steel Hysteretic Dampers Structural Expansion Joints  >> arthquake Expansion E Joints for Road Bridges  >> wivel-Joist Expansion S Joints of Type DS   >> use Box for Modular F Joints...

MAURER Structural Protection Systems – as unique as the buildings they protect >>“Earthquakes are natural disasters whose feature is that most of the human and economic losses are not due to the earthquake mechanisms, but to failures in man-made facilities, like buildings, bridges etc., which supposedly were designed and constructed for the comfort of the human beings.” (Bertero) The above observation brings a note of optimism and is encouraging because it tells us that, in the long run, seismic problems are solvable in principle. The task of solving these problems is attributed to Seismic...

>> Structural Protection Systems MAURER is more than a supplier of Seismic Hardware MAURER has acquired a vast experience in the application of modern seismic protection technologies within a wide variety of structures to minimise earthquake induced damage. MAURER’s experts offer structural designers and architects assistance in the definition of the protection systems and in the selection of devices best suited for each case, considering not only the seismicity of the site, but also the structural, functional and architectural needs of the works. Isolated building, ONASSIS Home of Letters...

Seismic Analysis – a tool to develop through our devices your Seismic Protection System The linear (or modal) analysis represents the most commonly applied method to evaluate the effects (forces, deformations etc.) of an earthquake. The seismic input in this case is the “elastic response spectrum”. However, we can resort to this procedure only if a set of conditions are met. The most important of them being the effective damping ratio must be less than 30 %. One of the major drawbacks of the linear analysis is the inability to verify whether or not the isolation system possesses an adequate...

>> Basic Concepts of Earthquake Protection Having once established the level of protection required, the seismic engineer must make certain strategic choices and depending on the type of structure, the seismicity and geological nature of the site, the norms currently in force, etc. . Today, seismic engineers can rely upon numerous solutions and relevant types of seismic devices that have already been successfully adopted with success within the last three decades. These solutions can be grouped into two main types: >> 1. Provide the structural members with sufficient flexibility, strength...

>> Basic Concepts of Earthquake Protection >> Mitigation In the bar chart the alternative to structural reinforcement is Seismic Mitigation, which is the most effective design approach for protecting structures erected in earthquake prone zones. The latter can be obtained through: –  Seismic Isolation, –  Energy Dissipation, or, better of a –  combination of both. Seismic isolation is by far the most used design approach to reduce the seismic response following an earthquake impact, that is to say, to mitigate its disastrous effects. A proper isolation system must be capable of...

>> Hydraulic Coupling and Damping Elements MAURER Restraint Systems for Strengthening >> Permanent Restraints (HK; HKE) Even if permanent restraints represent the family of the conceptually simplest seismic hardware, nonetheless they comprise a large variety of devices. Thus their standardization is problematic and MAURER has adopted the strategy of the “tailor-made” design according to the specifications given by the designers. These restraints can be designed to laterally fix the structure in X and Y direction (HK device) or guide it in one direction (unidirectional = HKE device) only....

>> Hydraulic Coupling and Damping Elements Fd = Design value provided by designer for ULS load case not including reliability factor yx of 1.5 (see EN 15129) for MSTU and 1.1 for MSTL L1, L0, HP and BP dimensions include and consider reliability factor yx of 1.5 for MSTU and 1.1 for MSTL on top of Fd - Operating temperature range -40 to +40 °c - Considered SLS load duty cycles 100,000 considering 0.7 x Nd - Damping index exponent a = 0.04 for MSTL - Lock-up velocity 0.2-5 mm/s to be adjusted depending on demand >> The preliminary dimensions are based on the values as follows: - Max. inner...

>> Bearing Elements for Base Isolation MAURER Bearing Systems for Base Isolation and Mitigation >> Elastomeric Isolators Nissibi Bridge, Turkey MAURER Elastomer Isolators decouple structures from their foundations during an earthquake, thereby reducing the seismic energy that impacts on the building. Elastomer Isolators are proven elastomer bearings. Depending on its formulation, the elastomer allows the seismic energy to be converted through the damage-free deformation of the elastomer molecules. The isolators transfer the vertical loads from the structure while at the same time allowing...

>> Bearing Elements for Base Isolation >> Rectangular Lead Rubber Bearing (MLRB) >> Possible technical parameters: >> Table of dimensions for lead core bearing (MLRB) d = total displacement for earthquake combined max with service condition H1 = overall height of round bearing H2 = overall height of rectangular bearing - Shear modulus: 0.9 N/mm2 - The total displacement dmax already includes the recommended safety coefficients for movement as per EN 1998 (yx of 1.2 for buildings and yx of 1.5 for bridges) Nd = max. vertical design load combined with service displacements d N = vertical...