English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

This is a study of calculation formulas of first natural frequency of rectangular flat slabs of arbitrary width with various edge conditions. Formerly, only the calculations formulas on both the first natural frequencies the rectangular flat slabs with simple supported edges and all edges built-in have been proposed as the edge conditions. The arbitrary edge conditions except both of them have not been proposed so far. So an author derived the generalized calculation formulas of the first natural frequencies from the various edge conditions. The first natural frequencies of the ordinary flat slabs are intermediate between the simple supported edges and all edges built-in. So the author has defined the restraint along edges of the rectangular flat slabs as the former is assigned 1 and the latter is assigned 2. From the above-mentioned, the author has estimated that the first natural frequencies of the ordinary flat slabs would be one and a half times of the simple supported edges.

A STUDY ON BOTH THE CALCULATION FORMULAS OF FIRST NATURAL FREQUENCIES AND THE RESTRAINT ALONG EDGES IN THE RECTANGULAR FLAT SLABS