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Verga e contra-verga são pequenas vigas estruturais de concreto armado utilizadas para reforçar aberturas de portas e janelas na alvenaria. Elas funcionam como elementos de transição que absorvem e distribuem o peso e as tensões da parede para as laterais. Sem esses reforços, o fluxo natural de cargas é interrompido pelo espaço vazio do vão, concentrando os esforços nas quinas da abertura. Essa sobrecarga gera tensões de tração que a massa e os tijolos não suportam sozinhos, resultando em trinca
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