Weight (W = Mg) should be assigned to the free joint (J-end of the link) as a joint force load in the gravity direction in any self-weight load pattern.Mass M should be assigned to the free joint (J-end of the link).Changes to mass must be accounted for in the following locations: Mass – The mass M strongly affects how strongly the TMD influences response.
In this case, the shear distance from end J can be set to zero for the U2 and U3 degrees of freedom in the linear link property. We recommend drawing the link such that the I-end (first joint) attaches to the structure, and the J-end (second joint) is free. However, the drawn length of the link object is arbitrary and can be chosen for convenience it may even be zero. This is accounted for in the spring and mass properties used. Length – The pendulum length directly affects the period of the TMD.The link length is chosen as L = 0.1m, and mass is M = 10 kN-sec 2/m. In Model 2, a link is drawn at the top story. The linear stiffness properties for U2 and U3 are chosen as Mg/L. The linear stiffness along U1 (axial stiffness) should be based on the EA/L value of the hangers, where 1.0e6 kN/m is used in the attached file. Here, a linear link will represent the pendulum device by selecting Define > Section Properties > Link/Support Properties, then translational stiffnesses are defined along U1, U2, and U3. It is slightly more challenging to model a pendulum which is free to translate in 3D. Here, the spring constant is Mg/L, where M is mass, L is pendulum length, and g is gravity. Specify link propertiesĪny spring-mass system may be used to represent the swinging pendulum in 2D. Model 2 is created through the process which follows: 1. Model 2 - Test model with TMD Procedure for Model 2 Unable to render embedded object: File (Figure 3.png) not found. Model 2 – TestModel_With TMD.SDB features a subsystem which simulates the effect of a pendulum damper.Model 1 – TestModel_Without TMD.SDB does not use a TMD, serves as the control system, and is used to determine the frequency of the structure.These models, also available in the Attachments section as a zipped file, are described as follows: Within ETABS, whether the system is linear or nonlinear, these damping objects are modeled in parallel.įor reference, two SAP2000 models are attached, each identical except that Model 1 does not use a TMD, whereas Model 2 does. Damping – Within SAP2000, linear damping is included directly in the linear link property, while nonlinear damping is modeled using a viscous-damping link object in parallel with the linear link.Mass – Mass and weight are then assigned to the free joint.Spring – Assign spring properties to a linear two-joint link object in which one joint is attached to the structure, and the other joint is free.Guidelines for this subsystem are described as follows: Within SAP2000 or ETABS, a TMD may be modeled using a spring-mass system with damping. WHO CAN JOIN SAP 2000 TRAININGĪnybody who is interested to learn structural analysis can join the course however mostly civil engineers and structural engineers who want to develop their career in structural analysis and design of buildings.are interested in this course.īasic knowledge of computer and structural design.Error formatting macro: live-template: Ī tuned-mass damper (TMD), also known as a pendulum damper, is not really a damper, but rather a pendulum or another gravity-based oscillator which is attached to the structure in such a way that it counteracts the vibration of one or more fundamental modes, thereby reducing the wind and/or seismic response of those modes.
Moreover SAP 2000 can be used to calculate the Seismic Weight and self weight of a building easily. In this course we will learn to do the analysis of residential building. Normally SAP 2000 is used for all types of general structures like residential building, stadiums, water tanks, chimneys and so on. SAP 2000 provides structural components which helps to design beam and column of the structure. SAP 2000 has both 2D and 3D features. Learn SAP 2000 at one of the best training center, IT Training Nepal located at Putalisadak, Kathmandu. SAP stands for Structural Analysis Program which is used by Civil Engineers for the analysis and design of structures.
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