Except as noted below, bridges and structures in Texas do not require analysis for seismic loading due to the low seismic hazard as shown in Article 3.10.2.

The TxDOT Bridge Standards and conventional bridge configurations have been evaluated for seismic effects and do not require further analysis.

For conventional structures with superstructure unit lengths or interior bent "H" heights outside of the limits stated in the TxDOT Bridge Standards and which are located in Brewster, Presidio, Jeff Davis, Culberson, Hudspeth and El Paso counties, check Minimum Support Length Requirements outlined in Article 4.7.4.4.

Non-conventional or exotic bridges do not require seismic evaluation, except those located in Brewster, Presidio, Jeff Davis, Culberson, Hudspeth and El Paso counties. In these locations, evaluate the structure for earthquake effects as required by Article 3.10. Contact the TxDOT Bridge Division for guidance.