Wall Street up on earnings ahead of Bernanke

Dow Jones, S&P 500 index and Nasdaq up 0.5% each

U.S. stocks rose at the open on Tuesday after strong earnings from Goldman Sachs and as investors awaited testimony from Federal Reserve Chairman Ben Bernanke, who may offer clues into steps the central bank could take to stimulate the economy.

The Dow Jones industrial average rose 67.59 points, or 0.53 percent, to 12,794.80. The S&P 500 Index gained 7.21 points, or 0.53 percent, to 1,360.85. The Nasdaq Composite added 16.93 points, or 0.58 percent, to 2,913.87.