<?php
define( '_JEXEC', 1 );
define('JPATH_BASE', dirname(dirname(__FILE__)));
define( 'DS', DIRECTORY_SEPARATOR );

require_once (JPATH_BASE . DS . 'includes' . DS . 'defines.php');
require_once (JPATH_BASE . DS . 'includes' . DS . 'framework.php');
require_once (JPATH_BASE . DS . 'libraries' . DS . 'joomla' . DS . 'factory.php' );

define('JPATH_COMPONENT_ADMINISTRATOR', JPATH_BASE . DS . 'administrator' . DS . 'components' . DS . 'com_content');

$mainframe = JFactory::getApplication('site');

require_once (JPATH_ADMINISTRATOR.'/components/com_content/models/article.php');


$json_str = array('title 1', 'title 2', 'title 3');

$new_article = new ContentModelArticle();

foreach($json_str as $row){
    var_dump($row);

    $data = array(
        'title' => $row,
         'alias' => time(),
        'introtext' => 'my intro text',
        'catid' => 8,
        'created_by' => 434,
        'access' => 1,

    );

    $new_article->save($data);

}