KONTRIBUSI DINDING BATA TERHADAP KINERJA STRUKTUR SPACE FRAME DENGAN METODE PUSHOVER (STUDI KASUS PADA GEDUNG IKATAN ALUMNI UNIVERSITAS SYIAH KUALA)

The influence of brick walls to performance of space frame is often being ignored, even though in this condition walls are participating in strengthen the building. Contribution of brick walls to performance of space frame structure with push over method goal is to know how the impact of walls in building structure performance which is being ignored all this time. Building of alumnus association was being modeled in two condition, first condition with the walls were being ignored and second condition with brick walls were modeled as a strut force. Modeling brick walls as strut alumnus association building Syiah Kuala university increased structure performance at this building. Modelling with brick walls as strut in pushover analysis x direction at MTS model minimize the displacement 6,36% from MTS model and increased building ability to accept base shear 301,71% from MTS model. Modelling with brick walls as strut in analysis displacement at Y direction increase 4,38% from MTS model. This thing showed that walls impacted building performance in bearing base shear. Plastification condition structure element at X direction without strut modeling, there is 54 element which had already collapsed (collapse prevention) whereas at building with strut modelling has 6 element which already collapsed (collapsed prevention). Plastification condition element structure at Y direction in building without strut modelling has 14 element which already collapsed (collapsed prevention).

Effectiveness of Different Connectors Used in DLGs

Double-Layer Grid structures are three-dimensional pin-jointed structures, which are generally used for covering roofs having large span areas with the help of connectors. A Double Layer Grid structures are quite popular as the use of material can be reduced, easy to assemble and permits quicker construction. The weight of the structure depends on the member as well as connectors. The connectors contain 20-30% of total weight (by referring Lan, T.T. “Space frame structure”). In present study, two types of Connectors are used for analysis and for optimisation of structure. The aim of this study is to optimize the design and to get the effective connector. Solid connector and Hollow connector (with varying thickness) have been taken for parametric study, modelled in CREO and analysed using ANSYS 17.2. The results of stresses have been obtained under the static loads for comparison.

Novel Distributed PZT Active Vibration Control Based on Characteristic Model for the Space Frame Structure

A novel distributed PZT control strategy based on characteristic model is presented for space frame structure in this paper. It is a challenge to obtain the exact mechanical model for space structure, since it is a coupling MIMO plant with unknown parameters and disturbances. Thus the characteristic modeling theory is adopted to establish the needed model, which can accurately describe the dynamic characteristics of the space frame structure in real time. On basis of this model, a keep tracking controller is designed to suppress the vibration actively. It is shown that the proposed model-free method is very robust and easy to implement. To solve the complex and difficulty problem on PZT location optimization, an efficient method with modal strain energy and maximum vibration amplitude is proposed. Finally, a simulation study is conducted to investigate the effectiveness of the proposed active vibration control scheme.