Numerical Models of the Connection of Thin-Walled Z-Profile Roof Purlins

High thin-walled purlins of Z cross-section are important elements in steel wide-span structures. Their behaviour is influenced by many variables that need to be examined for every specific case. Their practical design thus requires extended knowledge of their behaviour for the possible configurations and dimensions. Numerical analysis verified by experimental investigation can thus enrich such knowledge. Numerical models have the advantage of repeatability and the ability to offer parametric changes. The parametric study presented shows a detailed description of a finite element model of thin-walled cross-sectional roof purlins connected to other roof elements. Models include various approaches to modelling bolt connection. Two schemes of purlins, with and without cleats, are presented. The results of different approaches in numerical modelling are compared with the results of a physical test on a real structure. The article shows a significant agreement in the case of specific approaches and points out the differences with others. The results can be helpful in terms of how to approach the modelling of thin-walled structures and the effective approach to experimental preparation.

Random vibration analysis of thin-walled elastic rings under multiple moving loads

This paper investigates the random vibration of a thin-walled ring subjected to multiple moving loads from the inside of the ring. A ring gear in a planetary gear train with three equally-spaced planets is taken as an example. The ring is discretized with the finite element method of curved beam elements. The supports of the ring gear are treated as three linear springs to mimic a general bolt connection. The stochastic Newmark algorithm is used to solve the equations and obtain the response's mean and variance. Monte Carlo simulations are also conducted to verify the results from the stochastic Newmark scheme. A parametric study is conducted to examine the effect of design parameters on the responses.

KEKUATAN TAHANAN LATERAL SAMBUNGAN GESER GANDA PADA KOMPOSIT LVL KAYU SENGON DAN WPC JATI

<p>Wood utilization technology is needed to meet the increasing demand for wood. These technologies are such us LVL and WPC. To make this wood a structural material, size limitations are a problem in its application. To overcome size limitations, a connesction is required. The research was conducted to determine lateral resistance in composite LVL Sengon wood and WPC Teak wood.<strong> </strong>This research use a standart bolt connecting tool for composite of LVL Sengon wood and WPC Teak wood with a variations in the diameter of 6 mm, 8 mm, 10 mm, and 12 mm using a double shear methode. This research was conducted at the Universitas Tidar and testing using UTM at Universitas Negeri Yogyakarta.<strong> </strong>Based on the results of the research, it was found that the value of lateral resistance testing on composite LVL Sengon and Teak WPC using standard bolts with variations in diameter 6 mm, 8 mm, 10 mm, and 12 mm were 4150,37 N, 5761,74 N, 8258 ,37 N, and 12416,33 N. The greatest lateral resistance occurs when using bolts with a diameter of 12 mm. The melt mode that occurs in all specimens is the IIIs melt mode, namely the formation of two plastic hinges in the bolt connection and damage to the side wood.</p>