WASHINGTON, D.C.-Ten thousand Metropolitan Police and Federal troops-supported by Marine paratroopers and the Army 82nd and 153rd Airborne Divisions-arrested more than 7000 antiwar demonstrators here yesterday and herded them into jails and makeshift detention centers.

Mass civil disobedience aimed at shutting off the downtown section of Washington was, for the most part, ineffectual, and police reported no significant traffic disruptions during rush hour. Government officials said most workers made it to their jobs, usually on time.

Mass arrests began early yesterday morning when scheduled Mayday activities lapsed into widespread trashing and street fighting in the downtown area. Mayday organizers say they will resume demonstrations today.

Late yesterday afternoon, FBI agents arrested Rennie Davis, one of the key Mayday organizers and Chicago 7 defendant, on charges of conspiring to plan disruptions, conspiring to prevent government workers from going to work, and conspiring to interfere with the constitutional rights of persons in the Capitol. He is being held on $100,-000 bond.

Arraignment

Although Washington Superior Court convened at noon yesterday, its eight judges did not begin arraignments until 4 p.m. Cases are being considered on an individual basis-a process officials say was to continue through the night-and it is doubtful that any substantial number of the 7000 demonstrators will be released before tomorrow or Thursday.

Superior Court judges are taking a hard line toward demonstrators, setting bail between $200 and $250 and in most cases refusing to grant bail collateral of ten per cent. That means most people will have to come up with over $200 in order to be released.

All Washington area jails are filled to capacity, including over 1000 cells in the central Washington prison system. When jails reached capacity, police began routing busloads of those arrested to a fenced practice field adjacent to Robert F. Kennedy Stadium.

Police made plans last night to move over 2000 persons being held there to the D.C. Coliseum until they can be processed in the courts. That will take at least until late this afternoon, court officials indicated last night.

A large number of those arrested-perhaps as many as half-may have charges against them dropped because short arrest forms were not made out at the time they were taken into custody.

Concentration Camp

The outdoor detention center had all the trappings of a concentration camp. People there were retained by an 8-foot high fence ringed by army troops and police for almost 14 hours. There were no sanitation facilities inside the camp and shelter and water were limited.

A row of army supply trucks laden with pepper gas was situated about-100 yards from the entrance to the detention area. Another truck stood by with barbed wire in case demonstrators collapsed the feeble wire fence which held them in.

Those arrested almost succeeded in pushing through the fence at one point yesterday afternoon, but police used gas to drive them back. Across the street from the practice field, members of the 82nd Airborn Division-flown in from Fort Bragg, North Carolina Sunday-were stationed throughout RFK Stadium, ostensibly to ward off the unarmed demonstrators should they somehow escape from the camp.

Most Mayday regional groups arrived at their target areas in small affinity groups at about 6 a.m. yesterday, hoping to stop traffic at 12 key intersections and bridges. However, police and federal troops awaited them at each site, and turned demonstrators back toward the downtown area.

Police arrested demonstrators and bystanders indiscriminately throughout the morning and frequently used pepper gas and tear gas to break up bands of demonstrators who roamed the streets trying to block intersections with debris.

On several occasions, demonstrators pushed parked cars into intersections or built barricades out of brick, trash barrels, and wood across the streets.