Commercial Complex Escalator Trusses in China
China’s increasing economic development has led to the construction of many large commercial complexes with an increasing demand for escalators with great heights, large spans, and without intermediate supports.
|Design, Structural Engineering, Construction||
Giant KONE Elevator Co., Ltd., China
Escalator Model Parameters
These types of escalators place a strong demand on the structure’s required strength and stiffness. Giant KONE has developed an escalator type for exactly this purpose. From the project’s beginning, they utilized RFEM to contrast and compare various escalator designs. Ultimately, they decided to utilize a spacious quadruple single truss and further utilize RFEM to optimize the system including the truss height and cross-sections.
The final design’s calculation results fully meet the various requirements of EN 115 and EN 1993. In addition, the truss’s natural frequency was calculated to ensure tolerable vibrations for passengers walking on the escalator.
Further testing regarding the actual structure stiffness under a passenger load of 0.73 psi had shown the tolerance between the deformation calculated by RFEM and the deformation measured by the test differed by only 8%. The structure’s natural frequency was also substantially close to the measured frequency.
Giant KONE was pleasantly surprised by RFEM’s computing speed. According to Giant KONE, RFEM also offers further advantages including the quick modeling workflow and high accuracy calculations. The structure’s future performance can also be researched before the prototype is created, which reduces the number of prototypes and shortens the development cycle. This has reduced development and manufacturing costs resulting in significant advantages for the company.
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In RF-/STEEL EC3, the Window 1.4 Lateral Intermediate Supports offers you the option to define lateral intermediate supports at individual members. These supports are created from connected purlins and horizontal beams, for example, and increase the resistance against lateral-torsional buckling. Lateral intermediate supports can be entered either with a relative or an absolute distance.
The model is constructed by means of parameters for geometry and loads and regenerates when the parameters are changed.
RF-/STEEL Cold-Formed Sections Module Extension | Design of cold-formed sections according to EN 1993-1-3
3D model of the butadiene storage sphere in RFEM (left) and the mode shape from RF-DYNAM Pro (right)
3D model of the steel structure with the results of structural design according to GB 50017-2003 in RSTAB (© Novum Structures LLC)
SHAPE-THIN determines the effective cross-sections according to EN 1993-1-3 and EN 1993-1-5 for cold-formed sections. You can optionally check the geometric conditions for the applicability of the standard specified in EN 1993‑1‑3, Section 5.2.
The effects of local plate buckling are considered according to the method of reduced widths and the possible buckling of stiffeners (instability) is considered for stiffened sections according to EN 1993-1-3, Section 5.5.
As an option, you can perform an iterative calculation to optimize the effective cross-section.
You can display the effective cross-sections graphically.
Read more about designing cold-formed sections with SHAPE-THIN and RF-/STEEL Cold-Formed Sections in this technical article: Design of a Thin-Walled, Cold-Formed C-Section According to EN 1993-1-3.
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