To dream of seeing the beams of an existing building may represent your awareness of underlying requirements of a situation. Noticing what it took to get somewhere. Understanding why power or security exists. Observing what is needed in your life to ensure that failure is not possible.
To dream of beams in new construction may reflect how you are laying the groundwork to establish yourself. Working hard to guarantee that failure can ever happen again. Setting the stage for success or achievement through fundamental requirements. Secure goals coming to life.