Modeling, analysis & design of lattice tower structures

College

Gokongwei College of Engineering

Department/Unit

Civil Engineering

Document Type

Conference Proceeding

Source Title

Continuing Professional Development (CPD) Seminar

Publication Date

2-23-2007

Abstract

Lattice tower structures include, but not limited to, communication towers, transmission line towers, billboards and other signage structures. The structural system is modeled by members joined at the ends using smooth pins and forming series of triangles. The loads are also assumed to be applied at the joints. the members are said to be homogeneous and experiences only transile or compressive forces. However, obviously due to the nature of construction and connection details of one element to the other, some members may be considered acting as frame members thus subject to not only axial, but also shear and bending forces. This type of model may mean higher degree of indeterminacy and thus complicating the used-to-be very easy manual analysis. However, with the advent of computers and very powerful analysis software, such degrees of indeterminacy and complexities become to easy to handle.
When typhoon "Milenyo" struck Metro Manila last September 28, 2006, it resulted to severe damage to material property, in general, and to various lattice type structures, and even deaths. As compared to solid signage strictures, more latticed billboard structures failed and collapsed due to the said typhoon. In the wake of the said typhoon, awareness to the various government agencies, the general public, members of professional organizations, academe, and billboard owners as to the safety, adequacy even appropriateness of such structures both in the metropolis and throughout the country were raised. To address these concerns, the 1st ASEP Forum on Billboards was held to identify issues at hand from various stakeholders in order to come up with administrative and technical solutions especially along the realm of structural engineering and construction.
The new National Structural Code of the Philippines (NSCP C101-101) serves as our reference in modeling, analyzing and designing various lattice tower structures. NSCP Volume 1 deals with buildings, towers and other vertical structures. This presents a very detailed guide for practicing civil/structural engineers as well as senior civil engineering students regarding the use of the new wind load provisions of the NSCP 101-01 with roof live load, and in combination with dead load. Practicing civil/structural engineers need to update their knowledge from the NSCP 1992. There is a great need for us to introduce the various revised provisions of the said code most especially on the use of the new wind force procedure.
This is the very essence of why this Continuing Professional Development (CPD) seminar is being conducted. The aim is to be able to impart to the young structural and civil engineers the correct wat to model, analyze and design structures-especially lattice tower structures.
Technical information and interpretation is presented to help us go through the various numerical examples of wind load calculations for towers using the new provisions.

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Disciplines

Adult and Continuing Education | Construction Engineering and Management

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