Trying to succeed where Comcast failed, Charter Communications has struck a deal to buy Time Warner Cable, an acquisition that would create a powerhouse in the consolidating American cable and broadband industry.

Charter plans to announce on Tuesday a $55 billion deal for its larger rival and an approximately $10 billion takeover of a smaller competitor, Bright House Networks, people with direct knowledge of the matter said on Monday.

With those deals, Charter will become a significantly stronger rival to Comcast, the giant of the cable industry, which had until last month sought to buy Time Warner Cable itself until the plan met resistance from federal antitrust regulators.

The flurry of deal-making reflects the efforts of an industry grappling with a tectonic shift in how Americans watch and pay for television. With customers increasingly turning to the Internet for videos, cable companies have sought to combine to gain bigger scale and leverage in negotiations with content providers.